Multimodal approach utilising a weight management programme prior to bariatric surgery in patients with BMI ≥50 kg/m2: A propensity score matching retrospective cohort study

We evaluated preoperative weight loss and days from initial consult to surgery in patients with BMI ≥50 kg/m2 who were and were not enrolled in medical weight management (MWM) prior to laparoscopic sleeve gastrectomy. We retrospectively identified patients with BMI ≥50 kg/m2 who had primary sleeve gastrectomy between 2014 and 2019 at two bariatric surgery centres in our healthcare system. Patients presenting after 2017 that received preoperative MWM (n = 28) were compared to a historical cohort of non-MWM patients (n = 118) presenting prior to programme initiation in 2017 on preoperative percent total body weight loss (%TBWL) and days from initial consult to surgery. A total of 151 patients (MWM, 33; non-MWM, 118) met inclusion criteria. BMI was significantly greater in MWM versus non-MWM (p = .018). After propensity score matching, median BMI at initial consult in non-MWM versus MWM no longer differed (p = .922) neither were differences observed on the basis of weight, age, sex, race or ethnicity. After PSM, MWM had significantly lower BMI at surgery (p = .018), lost significantly more weight from consult to surgery (p < .001) and achieved significantly greater median %TBWL from consult to surgery (p < .001). We noted no difference between groups on 6-month weight loss (p = .533). Days from initial consult to surgery did not differ between groups (p < .863). A preoperative MWM programme integrated into multimodal treatment for obesity in patients with a BMI ≥50 kg/m2 resulted in clinically significant weight loss without prolonging time to surgery.

Attitudes Towards Conflicts of Interest in Medical Research: A Survey of US Medical Students

Industry funds nearly two-thirds of US healthcare research, and industry-sponsorship may produce more favorable research results and conclusions. Medical students report feeling inadequately prepared to avoid negative industry influence. Research of educational interventions that educate students on the potential effects of industry influence is lacking, and no interventions have demonstrated long-term benefit. Surveying and assessing student opinions of the relationship between industry and research may help improve future educational interventions. We surveyed preclinical and clinical students at seven US medical schools regarding their attitudes towards industry conflicts of interest (COIs) in medical research. A total of 466 medical students including 232 preclinical and 234 clinical students completed the survey. Of those who had research experience, clinical students were more likely than preclinical students to look for COIs (62.0% v 45.9%, p = .014) and to consider whether author COIs are pertinent to the article (68.1% v 54.1%, p = .023). Many disagreed that they felt adequately educated on the issue of COIs (42.7%), but most agreed that medical school should take a role in guiding student interactions with industry (65.0%). Students responded that all listed financial relationships between industry and investigator, except for providing food and/or beverage, would likely bias the investigator's research. Many students feel inadequately educated on industry issues in biomedical research, and most believe medical schools should help guide interactions with industry. Our findings support further development of educational interventions that prepare students to navigate the relationship between industry and medical research during and after medical school.

Five-year outcomes of revisional bariatric surgery: gastric band to sleeve gastrectomy or to Roux-en-Y gastric bypass

BACKGROUND

Revisional bariatric surgery after an index adjustable gastric band (AGB) may be indicated to remedy weight relapse or band-related complications. We examined outcomes five years following revision from AGB to laparoscopic sleeve gastrectomy (AGB-LSG) or to Roux-en-Y gastric bypass (AGB-RYGB).

METHODS

We conducted a retrospective review to identify patients (men and women, age 18-80) who underwent one revisional bariatric procedure with AGB as the index procedure at two medical centers in our healthcare system between January 2012 and February 2017. We only included patients with a pre-revision BMI > 30 kg/m2 for whom 5-year follow-up data were available. We compared 5-year weight loss and remission of comorbidities in patients undergoing AGB-LSG and AGB-RYGB conversion.

RESULTS

A total of 114 patients met inclusion criteria (65 AGB-LSG, 49 AGB-RYGB). At 5-year post-revision, percent total weight loss (3.4% vs 19.9%; p < 0.001), percent excess weight loss (7.0% vs 50.8%; p < 0.001) and decrease in BMI (1.5 vs 8.8; p < 0.001) was greater in AGB-RYGB vs. AGB-LSG. No significant difference in remission or development of new comorbidities was observed.

CONCLUSION

Conversion of AGB to RYGB is associated with superior intermediate-term weight loss compared to conversion of AGB to LSG. Future multicenter studies with larger sample sizes are necessary to further describe the intermediate-term outcomes of revisional bariatric surgery.

Liposomal bupivacaine provides superior pain control compared to bupivacaine with adjuvants in interscalene block for total shoulder replacement: a prospective double-blinded, randomized controlled trial

INTRODUCTION

Optimal pain control methods after total shoulder arthroplasty (TSA) achieve reduced opioid consumption, shortened hospital stay, and improved patient satisfaction in addition to adequate analgesia. Interscalene brachial plexus block is the gold standard for TSA, yet it typically does not provide pain relief lasting beyond 24 hours. Liposomal bupivacaine (LB) purportedly provides prolonged analgesia, yet it has been minimally explored for interscalene block, and it is significantly more expensive than standard bupivacaine.

METHODS

This is a prospective, 2-arm, double-blinded randomized controlled trial. Subjects presenting for anatomic or reverse TSA were randomized in a 1:1 ratio to receive interscalene brachial plexus block with either LB plus bupivacaine (LBB group) or bupivacaine plus dexamethasone and epinephrine (BDE group). The primary outcome was 120-hour postoperative opioid consumption. Secondary outcomes were pain scores up to 96 hours postoperatively, pain control satisfaction, complications, level of distress from block numbness, and hospital stay.

RESULTS

Ninety patients, 45 per group, were included in the intention-to-treat analysis and randomized. Because of withdrawal of consent and loss to follow-up, 40 in each group completed enrollment through postoperative day 60. Total 120-hour postoperative opioid consumption was similar between groups (P = .127), with no differences within 24- or 48-hour time intervals. Postoperative pain scores at 24-48 hours, 48-72 hours, 72-96 hours, and day 60 were significantly lower for the LBB group.

DISCUSSION

LB interscalene brachial plexus block before total shoulder arthroplasty did not reduce 120-hour postoperative opioid consumption but significantly reduced postoperative pain between 24 and 96 hours and at postoperative day 60.

Prostate Cancer Detection and Complications of Transperineal Versus Transrectal Magnetic Resonance Imaging-fusion Guided Prostate Biopsies

OBJECTIVE

To assess the rates of detection of clinically significant prostate cancer (csPCa) and complications associated with transperineal (TP) and transrectal (TR) biopsy approaches to magnetic resonance imaging (MRI)-fusion targeted biopsy.

MATERIALS AND METHODS

We retrospectively identified men who underwent TP or TR MRI-targeted biopsy with concurrent systematic random biopsy from August 2020 to August 2021. Primary outcomes were detection rates of csPCa and 30-day complication rates between the 2 MRI-biopsy groups. Data were additionally stratified by prior biopsy status.

RESULTS

A total of 361 patients were included in the analysis. No demographic differences were observed. No significant differences were observed between TP and TR approaches on any of the outcomes of interest. TR MRI-targeted biopsies identified csPCa in 47.2% of patients, and TP MRI-targeted biopsies identified csPCa in 48.6% of patients (P = .78). No significant differences were observed in csPCa detection between the 2 approaches for patients on active surveillance (P = .59), patients with prior negative biopsy (P = .34), and patients who were biopsy naïve (P = .19). Complication rates did not vary by approach (P = .45).

CONCLUSION

Neither the identification of csPCa by MRI-targeted biopsy nor rates of complications differed significantly based on a TR or TP approach. No differences were seen between MRI-targeted approaches based on prior biopsy or active surveillance status.

Outcomes over 20 years performing robot-assisted laparoscopic prostatectomy: a single-surgeon experience

OBJECTIVE

To evaluate a single surgeon's 20-year experience with robotic radical prostatectomy.

METHODS

Patients who had undergone robot-assisted laparoscopic prostatectomy by a single surgeon were identified via an IRB approved prospectively maintained prostate cancer database. Patients were divided into 5-year cohorts (cohort A 2001-2005; cohort B 2006-2010; cohort C 2011-2015; cohort D 2016-2021) for analysis. Oncologic and quality of life outcomes were recorded at the time of follow-up visits. Continence was defined as 0-1 pad with occasional dribbling. Potency was defined as intercourse or an erection sufficient for intercourse within the last 4 weeks.

RESULTS

Three thousand one hundred fifty-two patients met criteria for inclusion. Clavien ≥ 3 complication rates decreased from 5.9% to 3.2%, p = 0.021. There was considerable Gleason grade group (GG) and stage migration to more advanced disease between cohort A (6.4% GG4 or GG5, 16.2% pT3 or pT4, 1.2% N1) and cohort D (17% GG4 or GG5, 45.5% pT3 or pT4, 14.4% N1; p < 0.001). Consistent with this, an increasing proportion of patients required salvage treatments over time (14.6% of cohort A vs 22.5% of cohort D, p < 0.001). 1-year continence rates improved from 74.8% to greater than 92.4%, p < 0.001. While baseline potency and use of intraoperative nerve spare decreased, for patients potent at baseline, there were no significant differences for potency at one year (p = 0.065).

CONCLUSIONS

In this 20-year review of our experience with robotic prostatectomy, complication rates and continence outcomes improved over time, and there was a migration to more advanced disease at the time of surgery.

The Effect of a Peritoneal Iliac Flap on Lymphocele Formation After Robotic Radical Prostatectomy: Results From the PLUS Trial

OBJECTIVE

To assess the effectiveness of a peritoneal flap on the formation of lymphoceles after robotic assisted radical prostatectomy with bilateral extended pelvic lymph node dissection.

METHODS

We conducted a single surgeon, assessor blinded prospective randomized controlled trial (the Prospective Lymphocele Ultrasound Study) in men undergoing robotic assisted radical prostatectomy with bilateral extended pelvic lymph node dissection. At the conclusion of the node dissection, patients were block randomized 1:1 to either standard of care (no bladder peritoneal flap) or to the creation of a bladder peritoneal flap. Lymphocele formation was assessed by pelvic ultrasound postoperatively. The primary outcome was lymphocele formation. Rates of lymphocele formation and complications were analyzed using chi-square. Other outcomes, including length of stay, number of lymph nodes removed, lymphocele volume, and quality of life measures, were analyzed by t-tests or Wilcoxon Ranked Sum Tests, as appropriate. An a priori power calculation was performed using O'Brien-Fleming alpha sharing for the interim analyses. Two preplanned interim analyses were performed when 45 and 90 patients per group had follow-up ultrasounds.

RESULTS

A statistically significant difference in lymphocele formation was seen on the second interim analysis for 183 patients (4.3% vs. 15.6%, p = .011) stopping enrollment; this remained significant in the final analysis of 216 patients (3.6% vs 14.2%, p = .006). No other significant differences were observed.

CONCLUSION

This prospective randomized trial supports the implementation of this simple modification for robotic assisted radical prostatectomy with bilateral extended pelvic lymph node dissection.

A randomized controlled trial of an enhanced recovery after surgery protocol in patients undergoing laparoscopic sleeve gastrectomy

BACKGROUND

The purpose of this study was to evaluate the effect of an enhanced recovery after surgery (ERAS) protocol on opioid and anti-emetic use, length of stay and safety after laparoscopic sleeve gastrectomy (LSG).

METHODS

Patients who underwent LSG between March 2018 and January 2019 at our accredited, high-volume bariatric surgery center were randomized to either standard of care (SOC) or ERAS. ERAS included a pre- and post-surgical medication regimen designed to reduce postoperative nausea, vomiting and pain. Outcomes included post-operative symptom scores, opioid use, anti-emetic use, time to achieve readiness for discharge (RFD) and inpatient and 30-day adverse events, readmissions and emergency department visits.

RESULTS

The final analysis included 130 patients, (SOC 65; ERAS 65). Groups did not differ on demographics or comorbidities. Relative to SOC, fewer ERAS patients utilized opioids in the hospital ward (72.3% vs. 95.4%; p < .001), peak pain scores were significantly lower, and median time to achieve RFD was shorter (28.0 h vs. 44.4 h; p = 0.001). More ERAS patients were discharged on post-operative day 1 (38.5% vs. 15.4%; p < .05). The overall use of rescue anti-emetic medications was not different between groups. Rates of postoperative 30-day events, readmissions, and emergency department visits did not differ between groups.

CONCLUSION

Relative to SOC, ERAS was associated with earlier discharge, lower pain scores, less frequent use of opioids and use in lower amounts after LSG with no differences in 30 day safety outcomes.

Potential Embolic Sources Differ in Patients With Embolic Stroke of Undetermined Source According to Age: A 15-Year Study

Introduction

Understanding the potential embolic source in young patients with ESUS may improve the diagnosis and treatment of such patients.

Hypothesis

Potential embolic sources (PES) differ in young vs. older patients with ESUS, and, therefore, not all patients with ESUS have the same risk profile for stroke recurrence.

Methods

Young patients (age 18-49) with ESUS, who were admitted to our stroke center from 2006 to 2019, were identified retrospectively and matched with next consecutive older patients (age 50-99) with ESUS by admission date. PES were categorized as atrial cardiopathy, AFib diagnosed during follow-up, left ventricular disease (LVD), cardiac valvular disease (CVD), PFO or atrial septal aneurysm (ASA), and arterial disease. Patients, who had cancer or thrombophilia, were excluded. The type and number of PES and stroke recurrence rates were determined and compared between young and older patients.

Results

In young patients (55.3% women, median age 39 years), the most common PES was PFO/ASA, and the rate of other PES was low (2-7%). Half of the young patients (54.1%) had a single PES, only 10% had multiple PES, and 35.3% of young patients did not have any PES identified. In older patients (41.7% women, median age 74 years), the 3 most common PES were atrial cardiopathy (38.1%), LVD (35.7%), and arterial disease (23.8%). Nearly half of older patients (42.9%) had multiple PES. The rate of stroke recurrence tended to be lower in young patients as compared to older patients (4.9 vs. 11.4%, p = 0.29). During a median follow-up of 3 years, only 3 young patients (4.9%) had a recurrent stroke, and two of them had unclosed PFO. There were no recurrent strokes among young patients with no PES identified.

Conclusions

It was noted that PES differ in patients with ESUS according to age and differences in recurrence. PFO is the only common PES in young patients with ESUS. Future studies prospectively evaluating PES in both age groups are needed.

Female sex is associated with worse outcomes following complex fenestrated or branched endovascular aortic repair

INTRODUCTION

Sex-related discrepancies after standard endovascular aneurysm repair (EVAR) are noted to disproportionally affect females. A growing body of literature suggests similar disparities may extend to complex fenestrated or branched endovascular aneurysm repair (FBEVAR). However, recent examination of complex FBEVAR by a consortium of high-volume centers noted equivalent mortality among sexes. Whether similar results extend to non-trial data is unknown.

METHODS

We examined all juxta-renal through type IV thoraco-abdominal aneurysms (sealing zones 6-8) who underwent elective FBEVAR within the Vascular Quality Initiative (VQI) database from January 2012 to December 2020. Urgent, symptomatic, ruptured, and staged cases were excluded, as were parallel stent grafts. Demographics, comorbid conditions, and technical factors were compared between sexes. Univariate analysis with Wilcoxon ranked sum tests and Chi-square tests of proportion were performed, followed by multivariate logistic regression for failure of target vessel technical success, reintervention, complications, and in-hospital mortality.

RESULTS

Our analysis included 1521 patients, 1180 males (77.6%) and 341 females (22.4%). There were noted differences in pre-operative demographics, medical optimization, and technical aspects of the procedure. However, no difference was noted in proximal or distal sealing stents, number of fenestrations, or immediate endoleaks. On multi variate logistic regression, female sex was an independent predictor of failure of target vessel technical success (OR 3.339, 95% CI: 2.173-5.132, p<.001), reintervention (OR 2.192, 95% CI: 1.304-3.683, p=.003), complications (OR 1.747, 95% CI: 1.282-2.381, p<.001), and in-hospital mortality (OR 2.836, 95% CI: 1.510-5.328, p=.001).

CONCLUSION

Females suffer worse outcomes after FBEVAR despite similar extent of disease, number of fenestrations, and incidence of immediate endoleak. Notable discrepancies were higher rates of COPD and lower rates of pre-operative aspirin, statin, and beta blocker therapy in females. Controlling for pre-operative demographics, female sex remained an independent predictor of worse outcomes. These discrepancies warrant further examination and should impact case planning for female patients undergoing complex aortic aneurysm repair.

Outcomes of MRI fusion-guided versus systematic standard prostate biopsies

INTRODUCTION

The current utility of MRI-fusion targeted biopsy as either an adjunct to or replacement for systematic template biopsy for the detection of clinically significant prostate cancer is disputed. The purpose of this study is to assess the current effectiveness of MRI-targeted versus systematic template prostate biopsies at two institutions and to consider possible underlying factors that could impact variability between detection rates in our patient population compared to others.

MATERIALS AND METHODS

A retrospective review from our prospectively maintained prostate cancer databases was conducted. Patients with prostate MRI lesions (PI-RADSv2) receiving concurrent systematic 12-core and MRI-fusion targeted biopsies were reviewed. Clinically significant cancer was considered to be Grade Group ≥ 2.

RESULTS

A total of 457 patients were included in the analysis; 255 patients received their biopsy at Institution A and 202 at Institution B. Overall cancer detection rate was 68%; the clinically significant cancer detection rate was 34%. Both MRI-targeted and systematic biopsies identified unique cases of clinically significant prostate cancer that the other modality missed. Out of 157 cases of clinically significant prostate cancer, MRI-targeted biopsy identified 29/157 cases (18%) missed by systematic biopsy, while systematic biopsy identified 37/157 cases (24%) missed by MRI-targeted biopsy (p = .39). Individual biopsy performance was similar when stratified by active surveillance or prior biopsy status, PI-RADSv2 score, and institution.

CONCLUSIONS

MRI-fusion targeted and systematic biopsy each identified unique cases of clinically significant prostate cancer. Both biopsy modalities should be utilized in order to provide the greatest sensitivity for the detection of clinically significant prostate cancer.

Abstract TP209: Potential Embolic Sources Differ In Patients With Embolic Stroke Of Undetermined Source According To Age

Introduction: Understanding the potential embolic source (PES) in ESUS patients may improve the diagnosis and treatment of such patients.

Hypothesis: PES differ in young vs old patients with ESUS.

Methods: Young patients (age 18-49) with ESUS who were admitted to our stroke center from 2006 to 2019 were identified retrospectively and matched with next consecutive older patients (age 50-99) with ESUS by admission date. PES were categorized as atrial cardiopathy, AFib diagnosed during follow up, left ventricular disease (LVD), cardiac valvular disease (CVD), PFO or Atrial septal aneurysm (ASA) and arterial disease. Patients who had cancer or a coagulopathy were excluded. Rate of types and number of PES and stroke recurrence were determined and compared between young and older patients.

Results: In young patients (55.3% women, median age 39 years), the most common PES was PFO/ASA and rate of other PES was low. Most of young patients had a single PES (54.1%), only 9 of the young patients had multiple PES. In older patients (41.7% women, median age 74 years), the 3 most common PES were atrial cardiopathy, LVD, and arterial disease. More older patients had multiple PES than single PES. More young patients as compared to older patients didn’t have any PES identified. The rate of stroke recurrence was lower in young patients as compared to older patients, the difference approached but did not reach statistical significance. During a median follow up of 3 years, only 3 young patients had recurrent stroke, two of them had unclosed PFO. There were no recurrent strokes among young patients with no PES identified. Among 9 older patients who had recurrent stroke, 6 had atrial cardiopathy, and AFib was detected in 4 patients during follow up.

Conclusions: PFO is the only common PES in young patients with ESUS, atrial cardiopathy is the most common PES in old patients with ESUS. Rate of other types of PES and stroke recurrence is low in young patients.

Utility of a Novel Scale to Assess Readiness for Discharge After Bariatric Surgery

BACKGROUND

The safe release of a patient from hospital care after bariatric surgery depends upon the achievement of satisfactory health status. Here, we describe a new objective scale (the Readiness for Discharge, RFD Scale) to measure the patient's suitability for hospital discharge after bariatric surgery.

METHODS

We conducted a retrospective, observational analysis of data collected in a randomized clinical trial of an enhanced recovery after surgery protocol for laparoscopic sleeve gastrectomy from 3/15/2018 to 1/12/2019. Nursing staff assessed 122 patients every 4-8 h after surgery using a checklist to document 5 components: ambulation, vital signs, pain, nausea, and oral intake of clear fluid. Satisfaction of each component was scored as "1" (satisfactory) or "0" (not satisfactory). Scores were summed and analyzed for patterns. RFD = 5 marked the patient as ready for discharge.

RESULTS

Sufficient intake of clear liquid was the last RFD component satisfied in 87% of patients. Two overall response patterns emerged: "Steady Progressors" (n = 51) whose RFD score rose steadily from 0 to 5 without reversion to a lower score; and "Oscillators" (n = 71) who had at least one temporary decrease in RFD score on the way to attaining 5, or showed a simultaneous oscillation of components without change in RFD.

CONCLUSIONS

The RFD checklist allows objective scoring of medical readiness for discharge after LSG and has the potential to improve clinical communication.

Identification of a five gene signature to predict time to biochemical recurrence after radical prostatectomy

BACKGROUND

Identification of novel biomarkers associated with high-risk prostate cancer or biochemical recurrence can drive improvement in detection, prognosis, and treatment. However, studies can be limited by small sample sizes and sparse clinical follow-up data. We utilized a large sample of prostate specimens to identify a predictive model of biochemical recurrence following radical prostatectomy and we validated this model in two external data sets.

METHODS

We analyzed prostate specimens from patients undergoing radical prostatectomy at Hartford Hospital between 2008 and 2011. RNA isolated from formalin-fixed paraffin-embedded prostates was hybridized to a custom Affymetrix microarray. Regularized (least absolute shrinkage and selection operator [Lasso]) Cox regression was performed with cross-validation to identify a model that incorporated gene expression and clinical factors to predict biochemical recurrence, defined as postoperative prostate-specific antigen (PSA) > 0.2 ng/ml or receipt of triggered salvage treatment. Model performance was assessed using time-dependent receiver operating curve (ROC) curves and survival plots.

RESULTS

A total of 606 prostate specimens with gene expression and both pre- and postoperative PSA data were available for analysis. We identified a model that included Gleason grade and stage as well as five genes (CNRIP1, endoplasmic reticulum protein 44 [ERP44], metaxin-2 [MTX2], Ras homolog family member U [RHOU], and OXR1). Using the Lasso method, we determined that the five gene model independently predicted biochemical recurrence better than a model that included Gleason grade and tumor stage alone. The time-dependent ROCAUC for the five gene signature including Gleason grade and tumor stage was 0.868 compared to an AUC of 0.767 when Gleason grade and tumor stage were included alone. Low and high-risk groups displayed significant differences in their recurrence-free survival curves. The predictive model was subsequently validated on two independent data sets identified through the Gene Expression Omnibus. The model included genes (RHOU, MTX2, and ERP44) that have previously been implicated in prostate cancer biology.

CONCLUSIONS

Expression of a small number of genes is associated with an increased risk of biochemical recurrence independent of classical pathological hallmarks.

Intraoperative electroencephalographic changes during transcarotid artery revascularization are more frequent than previously reported

OBJECTIVE

Up to 14% of patients undergoing carotid endarterectomy with continuous electroencephalographic (EEG) neuromonitoring will require shunt placement because of EEG changes. However, the initial studies of transcarotid artery revascularization (TCAR) found only one patient with temporary EEG changes. We report our experience with intraoperative EEG monitoring during TCAR.

METHODS

We conducted a retrospective review of patients who underwent TCAR at two urban hospitals within an integrated healthcare network from May 2017 to January 2020. The data included demographic information, patient comorbidities, symptom status, previous carotid interventions, anatomic details, contralateral disease, intraoperative vital signs and EEG changes, and postoperative major adverse events (transient ischemic attack, stroke, myocardial infarction [MI], and death) both initially and at 30 days postoperatively. The Fisher exact test was used for categorical data and the Wilcoxon rank sum test for continuous data.

RESULTS

A total of 89 patients underwent TCAR during the study period, of whom 71 (79.8%) received intraoperative EEG neuromonitoring. Of the 89 patients, 70.8% were men and 29.2% were women. The median age was 75 years (IQR, 68-82.5 years). Symptomatic patients accounted for 41.6% of the cohort. Of the 71 patients who received continuous neuromonitoring, 9 experienced EEG changes during TCAR (12.7%). The changes resolved in seven patients with pressure augmentation in three and switching to a low flow toggle in three. One patient who had sustained EEG changes had a new postoperative neurologic deficit. The median carotid stenosis percentage on preoperative computed tomography angiography was lower for patients with EEG changes than for those without (67% vs 80%; P = .01). No correlation was found between symptom status or 30-day stroke in patients with and without EEG changes (P = .49 and P = .24, respectively). Overall, three postoperative strokes, two postoperative deaths, and one MI occurred, for a composite 30-day stroke, death, and MI rate of 6.7%.

CONCLUSIONS

Changes in continuous EEG monitoring were more frequent in our study than previously reported. Less severe carotid stenosis might be associated with a greater incidence of EEG changes. Limited data are available on the prognostic ability of EEG to detect clinically relevant changes during TCAR, and further studies are warranted.

Does post prostatectomy decipher score predict biochemical recurrence and impact care?

PURPOSE

To examine the ability of the Decipher test to predict early biochemical recurrence after radical prostatectomy and to impact clinical decisions in advance of metastasis and death.

METHODS

We identified Decipher tests ordered after radical prostatectomy for adverse pathology in men treated for prostate cancer between 1/1/14 and 8/31/18. Biochemical recurrence was defined as prostate-specific antigen > 0.02 ng/mL. Decipher score is reported as lower risk (< 0.6) and higher risk ≥ 0.60). Kaplan-Meier analysis was used to examine the relationship between Decipher score and time to biochemical recurrence (months). Cox regression was used to analyze the relationship between Decipher score and time to biochemical recurrence while controlling for a number of clinical characteristics. Secondary analyses focused on a subset of men with prostate-specific antigen > 0.02 and < 0.20 ng/mL to determine if high-risk Decipher scores were associated with receipt of salvage treatment.

RESULTS

A total of 203 cases were analyzed: 37.9% and 62.1% had lower and higher risk Decipher scores respectively, and 56.2% had a biochemical recurrence. Median (inter-quartile range) follow-up was 20 (13.5, 25.3) months. Decipher score was significantly associated with time to biochemical recurrence (p = 0.027) while in the secondary analyses, high-risk Decipher scores (≥ 0.60) were associated with salvage treatment (p = 0.018). Stage category and Decipher score were significant predictors of time from elevated PSA to salvage treatment in the secondary analyses.

CONCLUSION

While it might not contribute statistically, Decipher score can be clinically useful in helping patients reach treatment decisions.

Increased P450 aromatase levels in post-menopausal women after acute ischemic stroke

Background

Sex differences in stroke have been attributed to the neuroprotective effects of estrogen, yet most clinical trials of estrogen supplementation for stroke prevention have failed. The contribution of sex hormones to stroke outcome remains a subject of debate. Aromatization of testosterone to estradiol in neural tissue leads to sexual differentiation. Emerging data suggests aromatase activity increases in response to brain injury, and increased aromatase expression is seen in the ischemic penumbra in animal models. The objective of this study was to examine the levels of endogenous sex steroids after acute ischemic stroke and determine if levels of sex steroids were associated with acute stroke outcomes.

Methods

Peripheral blood from ischemic stroke patients and controls was collected under an approved IRB within 24 h of symptom onset. 17β-estradiol, testosterone, and aromatase levels were measured in the serum of both men and women using ELISA. Hormone levels were compared in men vs. women in stroke and control groups and correlated with outcomes (NIHSS and change in the modified Rankin Scale (mRS), defined as the difference of premorbid and discharge mRS) using multivariate regression.

Results

We found no significant difference in estradiol levels 24 h after stroke in men (p = 0.86) or women (p = 0.10). In men, testosterone significantly decreased after stroke as compared with controls (1.83 ± 0.12 vs. 2.86 ± 0.65, p = 0.01). Aromatase levels were significantly increased in women after stroke as compared with controls (2.27 ± 0.22 vs. 0.97 ± 0.22, p = 0.002), but not in men (p = 0.84). Estradiol levels positively correlated with change in mRS in both women (r = 0.38, p = 0.02) and men (r = 0.3, p = 0.04).

Conclusions

Estradiol levels correlated with functional outcomes (change in mRS) in both men and women, at least in the acute phase (24 h) of stroke. However, no significant difference in estradiol levels is seen 24 h post-stroke in men or women. Testosterone levels decrease at 24 h after stroke in men. As seen in animal models, aromatase levels increase after acute ischemic stroke, but this was only true for women. These indicate an active aromatization process in post-menopausal women after acute ischemic stroke.

Trigger Fingers After Open Carpal Tunnel Release

Trigger finger (TF) and carpal tunnel syndrome (CTS) are common conditions often occurring together with an unclear relationship. While some studies conclude that TFs occur as a result of carpal tunnel release (CTR), others have not established a causal relationship. Our purpose was to evaluate the prevalence and timing of TF development in the same hand after open CTR in our population. This was a retrospective review of 497 patients undergoing open CTR by a single surgeon. Two hundred twenty-nine charts were analysed for age, gender, handedness, BMI, workers' compensation status, and background disease. We analysed the specific digit involved and timing to development of triggering after CTR. Thirty-one patients developed triggering after CTR (13.5%). Mean age was 52.5 (14.0) years. Follow-up ranged from 1 to 53 months with a median follow-up of 6 months (interquartile range = 2-13). The thumb was the most common to trigger (42.22%), followed by the ring 24.44%, middle 22.22%, little 8.89%, and index fingers 2.22%. Trigger thumb occurred at 3.5 months (3.6) post-operatively, while other digits triggered at 7.5 months (4-10.25) after surgery (P = .022). No risk factors were associated with TF development. Our results suggest that a trigger thumb develops more frequently and earlier than other trigger digits after an open CTR. Further study is needed to clarify the mechanisms involved and may enable specific treatment such as local anti-inflammatory medication following CTR. We suggest educating prospective carpal tunnel surgery patients to high risk of triggering following CTR.

Recanalization of cervicocephalic artery dissection

BACKGROUND AND PURPOSE:

While there exists a substantial literature on the risk factors and clinical manifestations of cervical artery dissection (CeAD) including carotid and vertebral artery, little is known about postdissection recanalization. The goal of our study was to provide a descriptive analysis of CeAD and recanalization after dissection with neuroimaging follow up.

METHODS:

We retrospectively analyzed 51 consecutive patients with confirmed diagnoses of CeAD based on neuroimaging. Demographic data, risk factors, and dissection characteristics were recorded. Neuroimaging studies were performed at 0, 3, 6, and >6 months.

RESULTS:

Among 51 cases, the mean age of dissection (mean ± standard error) was 49.4 ± 1.92 years, and female comprised 58.8% of the patients. Extent of stenosis was 100% dissection in 37.3%, 51%–99% in 41.2%, and <51% in 21.5%. The most common presenting symptoms were headache (54.9%), neck pain (49.0%), and dizziness/gait imbalance (39.2%). The most common associated risk factors were recent history of trauma to the head and neck (41.2%) and hypertension (41.2%). In follow-up imaging, overall, 47.1% (24/51) had complete recanalization (CR), while 35.3% (18/51) did not; in the former group, 75% (18/24) recanalized completely during the first 6 months following symptom onset. A majority (84.3%) of the patients were discharged home, 15.7% were discharged to a facility, and no mortality was reported. Interestingly, location, type-/nature of dissection, and treatment did not statistically appear to influence the likelihood of recanalization.

CONCLUSIONS:

The recanalization of CeAD occurs mainly within the first 6 months after symptom onset, following which healing slows down. The study did not find an association between location, pattern, or nature of dissection on artery recanalization.

The Effect of Age on Fracture Healing Time in Metacarpal Fractures

Background: Older patients are treated for fracture with increasing frequency. Although studies on animals suggest that older mice and rats heal fractures more slowly, the clinical implications remain unclear. A better understanding of differences in healing with age can help customize fracture treatment. Our purpose was to retrospectively evaluate metacarpal fractures for healing time looking specifically at age-related differences. Methods: A retrospective review of patients treated for metacarpal fractures was conducted. Patients with incomplete charts or inadequate follow-up were excluded. One hundred ninety-eight charts were analyzed. Demographic and other patient factors were documented. Fracture characteristics and treatment type were documented. Fracture healing was determined clinically. Plain radiographs and examination were used in decision making. Results: Age was not associated with fracture healing time as a continuous variable (P = .09). Patients above 75 years were not associated with increased healing time (P = .58). Fracture characteristics were related to healing time: minimally displaced and comminuted fractures healed faster than oblique fractures, spiral fractures, or transverse fractures (P = .048). Patients undergoing surgery healed faster than those without surgery (P = .046). Renal failure negatively affected fracture healing time (P = .03). Diabetes, hypothyroidism, and gender were not associated with healing time. Complications were not associated with age or other patient or fracture-related factors. Conclusions: Age does not affect clinical fracture healing time in adult. Therefore, older patients do not require disparate treatment. Other fracture-related factors and considerations such as functional demand and support systems might influence treatment decisions in fracture care.

Use of EPIC 26 to identify men likely to benefit from surgical interventions for urinary incontinence after radical prostatectomy

PURPOSE

To examine outcomes of surgical procedures for urinary incontinence after radical prostatectomy (post-RP UI) and to identify patients who may benefit from a surgical intervention to treat post-RP UI.

METHODS

A retrospective chart review identified men who underwent radical prostatectomy (RP) from July 2004 through July 2016 at our institution. Cases underwent surgical interventions for UI following RP. Controls had RP during the study period but did not have an intervention for UI following RP. We used the UI scale of the Expanded Prostate Index Composite (EPIC) 26 to: (1) quantify post-RP UI before and after UI intervention overall and for specific surgical procedures; (2) evaluate the significance of improvement in post-RP UI before and after UI intervention and (3) identify controls with levels of post-RP UI that were comparable to the cases.

RESULTS

Two thousand nine hundred and sixty-eight RPs were performed; 48 patients underwent further surgical intervention (39 slings, 9 artificial urinary sphincter, AUS). For 20 cases with complete EPIC UI data (15 slings, 5 AUS), the median (IQR) pre-UI intervention score was 27.00 (IQR 22.75-42.75). Improvement was significant overall (p < 0.001) and for slings (p = 0.001). 71/2085 controls had post-prostatectomy UI scores ≤ 27.0, suggesting that they may have benefited from a post-RP surgical intervention for UI.

CONCLUSION

Data support the effectiveness of surgery to treat post-RP UI. A sizeable population of unidentified men may benefit from a surgical intervention to treat urinary incontinence after RP.

Post-operative delirium in older patients following cancer related and other high-risk surgeries

e24024

Background: Older adults are at increased risk for postoperative delirium (POD). This risk might be higher in patients with cancer as underlying malignancy and its complications predispose individuals to develop delirium. Therefore, it is important to evaluate the onset of delirium in this patient population especially as POD is associated with increased risk of rehospitalization, decline in cognitive function, morbidity and mortality. Methods: We performed a retrospective review of patients aged ≥ 70 years admitted January 2017 through July 2019 to a tertiary care referral center for a high-risk surgery, defined as associated with a mortality risk greater than 1%. Cancer related surgeries (CRS) were identified through cross matching with Cancer Registry. Patients who had delirium assessment in the postoperative setting using the Confusion Assessment Method (CAM) were included. Chi-square tests of proportion, Wilcoxon Ranked Sum and multivariate logistic regression analyses were conducted. Results: A total of 2340 patients were included in this analysis, 315 of whom had (CRS). Overall, the age (median, IQR) of patients at surgery was 76 years (72-80) and the length of stay (LOS) was 7 (4-11) days. Patients receiving CRS were younger (75, 72-79) than those with non-CRS (76, 72-81) (p = 0.022); had a shorter post-operative LOS (4, 2-7 vs. 5, 3-8; p > 0.001), and were less likely to develop POD (7.6% vs. 16.1%; p < 0.001). Among patients receiving CSR, those who developed POD were older (78 vs. 74; p = 0.008) and had longer post-operative LOS (14.0 vs. 4.0; p < 0.001). Those having experienced radiotherapy (RT) for cancer within the year before the surgery, were more likely to develop POD (40.0% vs. 6.6% p. < 0.001). Chemotherapy in the year prior to surgery did not increase the risk of POD (6.1% vs. 7.8%; p = 0.721). Among those having non-CRS, a cancer diagnosis did not affect POD. A logistic regression predicting POD indicated that the lower likelihood of POD following CRS was independent of age or gender (OR = 0.40; p < .001); RT within one year prior was independent predictor of higher POD (OR = 5.48; p = 0.003). Our data presentation will include further analysis of POD risk factors. Conclusions: Although older adults receiving CRS were significantly less likely to develop delirium than patients with other high-risk surgeries, it is still important to evaluate POD in this population due to its impact of patients’ outcomes. Further understanding of POD risk factors, such as preoperative RT, would allow the development of targeted interventions that might lessen the risk.

Use of the Urethral Sling to Treat Symptoms of Climacturia in Men After Radical Prostatectomy

BACKGROUND

Climacturia affects up to 45% of men after radical prostatectomy (RP). Although urethral slings decrease the severity and frequency of stress incontinence after RP, their efficacy as a treatment for climacturia after RP has not been well studied.

AIM

The aim of this study was to assess patient-reported changes in climacturia symptoms after implantation of a urethral sling as a treatment for stress incontinence after RP.

METHODS

After Institutional Review Board approval, a retrospective chart review identified males aged 18-80 years who received urethral slings for stress incontinence after RP at our institution from 2012 to 2017. These patients were mailed an 11-item questionnaire asking them about climacturia symptoms before and after implantation of a urethral sling. Written informed consent was obtained from patients participating in the mailed questionnaire.

OUTCOMES

Respondents were asked to report on climacturia frequency and severity, bother, partner bother, and incontinence before and after implantation of urethral slings.

RESULTS

A total of 42 questionnaires were mailed; 17 were available for analysis. The median age (and interquartile range, IQR) of the sample at RP was 64 (59.5, 68.0). Almost all (94.1%) of the men were sexually active at the time of the study and 64.7% reported experiencing urinary leakage during sexual arousal. Most (58.8%) underwent the urethral sling procedure to treat general incontinence; 35.3% underwent the procedure to treat both general incontinence and incontinence during sexual activity and 1 (5.9%) underwent it for other reasons. A median of 28.1 months elapsed between RP and sling procedure (IQR: 18.36, 53.88; minimum: 8.00; maximum: 108.36). Statistically significant shifts toward improvement from presling to postsling were noted for frequency of leakage during sexual arousal or orgasm (P = .041) and for the degree to which leakage of urine during sexual arousal or orgasm was a "bother" (P = .027). While almost all (94%) of the men were incontinent before sling, this percentage dropped to 53% after sling (P = .031).

CLINICAL IMPLICATIONS

Urethral slings should be discussed as a treatment strategy for climacturia during clinical consultations with patients.

STRENGTHS & LIMITATIONS

Strengths include consistent surgical technique. Limitations include retrospective design, lack of a nonsling comparison group, subjective nature of outcome measures, possible response bias, and variability in time interval between RP and sling procedure.

CONCLUSION

Use of urethral slings after RP is associated with improvements in climacturia symptoms, bother, and incontinence. Nolan J, Kershen R, Staff I, et al. Use of the Urethral Sling to Treat Symptoms of Climacturia in Men After Radical Prostatectomy. J Sex Med 2020;17:1203-1206.

EMMPRIN/CD147 plays a detrimental role in clinical and experimental ischemic stroke

Background: Ischemic stroke is a devastating disease, often resulting in death or permanent neurological deficits. EMMPRIN/CD147 is a plasma membrane protein that induces the production of matrix metalloproteinases (MMPs), which contribute to secondary damage after stroke by disrupting the blood brain barrier (BBB) and facilitating peripheral leukocyte infiltration into the brain.

Results: CD147 surface expression increased significantly after stroke on infiltrating leukocytes, astrocytes and endothelial cells, but not on resident microglia. Inhibition of CD147 reduced MMP levels, decreased ischemic damage, and improved functional, cognitive and histological outcomes after experimental ischemic stroke in both young and aged mice. In stroke patients, high levels of serum CD147 24 hours after stroke predicted poor functional outcome at 12 months. Brain CD147 levels were correlated with MMP-9 and secondary hemorrhage in post-mortem samples from stroke patients.

Conclusions: Acute inhibition of CD147 decreases levels of MMP-9, limits tissue loss, and improves long-term cognitive outcomes following experimental stroke in aged mice. High serum CD147 correlates with poor outcomes in stroke patients. This study identifies CD147 as a novel, clinically relevant target in ischemic stroke.

Identifying Gaps and Missed Opportunities for Intravenous Thrombolytic Treatment of Inpatient Stroke

Background: Inpatient stroke-codes (ISC) have traditionally seen low treatment rates with IV-thrombolytic (IVT). The purpose of this study was to identify the predictors of true stroke, prevalent IVT-treatment gap and study the factors associated with such missed treatment opportunities (MTO).

Methods: A retrospective chart review identified ISC from March 2017 to March 2018. Clinical, radiographic and demographic data were collected. Primary analysis was performed between stroke vs. non-stroke diagnoses. Dichotomous variables were analyzed using Chi-Square test of proportions and continuous variables with Wilcoxon-Ranked-Sum test. Significant factors were then tested in a multivariate logistic regression model for independence.

Results: From 211 ISC, 36% (n = 76) had an acute stroke. Hemorrhagic stroke (HS) was present in 5.7% (n = 12). Of the remaining 199, 44% (n = 87) were IVT-eligible but only 3.4% (n = 3) were treated. Of the remaining 84 IVT-eligible-but-untreated patients, 69(82.1%) were mimics, while 15 (17.9%) had an ischemic stroke (IS), constituting a MTO of 1 in 6 IVT-eligible patients, with National Institutes of Health Stroke Scale (NIHSS) ≤4 being the commonest deterrent. Independent predictors of stroke were ejection fraction (EF) <30% (p = 0.030, OR = 3.06), post-operative status (p = 0.001, OR = 3.71), visual field-cut (p = 0.008, OR = 3.70), and facial droop (p = 0.010, OR = 2.59).

Conclusion: In our study, one in three ISC were true strokes. IVT treatment rates were low with a MTO of 1 in 6 IVT-eligible patients. The most common reason for not treating was NIHSS ≤4. Knowing predictors of true stroke and the common barriers to IVT treatment can help narrow this treatment gap.

Abstract TP310: Effect of an Extended Treatment Window on Transfer Times in Patients With Stroke

STK-OP-1 examines transfer times for patients going to a higher level of care. Known as door in, door out or DIDO, certified stroke centers are required to report times for both ischemic and hemorrhagic stroke patients transferred to a Primary or Comprehensive Stroke Center (CSC).

Purpose: Barriers to time-sensitive transfer and complex decision making are common. As a result, Hartford Healthcare (HHC) began a QI initiative to measure DIDO times while introducing advanced CTP imaging and treatment in the extended window, April 2018. This project evaluates the impact on DIDO.

Methods: This multi-center QI project evaluated data pre and post implementation for stroke transfers to the CSC. Pre-implementation was May 2017 to April 2018, post-implementation May 2018 to March 2019. Patient and process of care data abstracted from Epic was entered into Excel. The main analysis compared median DIDO times using Wilcoxon Ranked Sum.

Results: Data were collected on hospital, stroke type/severity and treatments administered; patient demographics, and key timing variables of door in/door out, EMS and CT. While there is no universal criterion for DIDO, 60 minutes is often the ultimate goal with 90 or 120 minutes as intermediate goals. Pre and post implementation median DIDO times for all hospitals were 117 and 139 minutes (p = 0.02), for HHC hospitals 115 and 137 minutes (p = 0.027) and for non-HHC hospitals 118 and 140.5 minutes (p = 0.423). Of the pre-implementation group, 7.8% had CTP imaging prior to transfer compared with 9.3% post. Extended times post-implementation include factors such as complex decision making, patient eligibility or hospital capacity issues. A new transfer algorithm was implemented April 2019. Future analyses will correlate DIDO with patient, stroke and treatment categories to better define delays and barriers.

Relevance: A JC directive to CSCs are to develop supportive relationships with referring hospitals to facilitate efficient care. As decision making becomes more complex, the process for transfer needs to improve. DIDO goals need to be realistic to prevent secondary imaging at the CSC, i.e. the tradeoff for an extra 15 or 20 minutes should translate into shorter door to puncture times. Reducing the time to treatment may help improve patient outcomes.

Abstract TP52: Endovascular Therapy in Patients Over 80 Years of Age With Acute Ischemic Stroke

Introduction: Acute ischemic stroke treatment has undergone a paradigm shift, with patients being treated in the extended time window (6-24 hours post symptom onset). The purpose of this study is to assess outcomes in stroke patients above 80 years of age undergoing endovascular treatment (EVT) in the extended time window.

Methods: Acute ischemic stroke patients presenting to Hartford Hospital between January 2017 to June 2019 were considered for the study. Stroke outcomes in patients above 80 years of age with anterior circulation ischemic strokes presenting in the extended time window (Group A, n=30) were compared to a younger cohort of patients below 80 years (Group B, n=31). Patients over 80 years treated in the traditional time window (within 6 hours of symptom onset) served as a second set of controls (Group C, n=40). Statistical analysis was performed with a significance level of 0.05

Results: For angiographic results, there were no statistically significant differences in terms of good outcomes (TICI 2b-3) among patients of Group A, when compared to Groups B or C (p>0.05). For the endovascular procedures, no significant differences were noted in the total fluoroscopy time (Median Group A 44.05, Group B 38.1, Group C 35.25 min), total intra-procedure time (Median Group A 144, Group B 143, Group C 126 min) or total radiation exposure (Median Group A 8308, Group B 8960, Group C 8318 uGy-m 2 ). For stroke outcomes, a good clinical outcome was defined as modified Rankin score of 0-2 at discharge. Significantly better outcomes were noted in the younger patients in Group B - 35.4%, when compared to 13.3% in Group A (p=0.03). Comparative outcomes differed in the elderly patients above 80 years, Group A -13.3% vs Group C - 25%, although not statistically significant (p=0.23). There was a significant difference in mortality in patients of Group A - 40% as compared to 12% in the younger cohort, Group B (p= 0.01).

Conclusions: In the extended time window, patients above 80 years of age were noted to have a higher mortality, morbidity compared to the younger cohort of patients. No significant differences were noted in the stroke outcomes in patients above 80 years of age when comparing the traditional and the extended time window for stroke treatment.

Abstract TP156: NIH Stroke Scale at Discharge as a Predictor for Return to Work Status After Mild Stroke

Background: A significant proportion of patients are unable to return to work (RTW) post stroke. While post-stroke depression and fatigue have been linked to patients’ RTW status, the role of discharge NIHSS has not been studied.

Objective: To evaluate role of stroke severity, depression, fatigue, and cognitive impairment on patients’ ability to RTW.

Methods: A retrospective study was conducted using a survey completed by a convenience sample of patients during follow-up in stroke clinic. The survey included PHQ-9, Fatigue Assessment Scale (FAS), and the Montreal Cognitive Assessment (MoCA). Demographic, work status, and clinical data (discharge NIHSS, mRS, medical history) were also collected. NIHSS was evaluated both continuously and dichotomized ( < 1, > 1). Patients who did and did not RTW were compared using chi square tests of proportions and Wilcox Ranked Sum tests; independence of factors was explored using logistic regression predicting RTW.

Results: Out of 135 patients surveyed, 41% (N=56) reported employment at the time of their stroke. Of those, a significant percentage of patients were unable to RTW post stroke (57.1%); 39.3% (N=22) were unable to RTW due to physical limitations. Further analysis revealed patients who did not RTW were more likely to suffer from fatigue (p=0.026), have higher rates of cognitive impairment (p=0.027) and a higher NIHSS at discharge (p<0.001). Very low NIHSS was a very strong RTW predictor as patients with an NIHSS ≤ 1 at discharge were 15 times more likely to RTW than patients with a higher NIHSS (p=.001). Patients who worked in professional, managerial, or artistic occupations pre-stroke were more likely to return to work than those in public service, skilled or unskilled labor occupations (p=0.023). In multivariate analyses, fatigue, cognitive impairment and depression were no longer significant when NIHSS at discharge was a covariate. Type of occupation was independent of NIHSS.

Conclusions: For patients with mild stroke, NIHSS at discharge indicating minimal to no disability is a strong independent predictor for RTW status. For patients with greater deficit, depression, fatigue and cognitive impairment could play a greater role; additional studies of patients with greater variety of stroke severity would be needed.

Abstract TP352: Safety and Efficacy of Andexanet Alfa in Patients With Life Threatening Intracerebral Hemorrhage: A Single Center Experience

Background: Intracerebral hemorrhage (ICH) is a devastating condition with high 30- day mortality. Up to a third of patients experience hematoma expansion within the first 24 hours; anticoagulation with factor Xa inhibitors may increase the risk of expansion and poor outcomes.

Objective: We assessed our experience using Andexanet alfa (Aα) by evaluating stabilization of the hematoma and ischemic complications.

Methods: We conducted a single center prospective observational study on all patients receiving Aα for reversal of anticoagulation in the setting of an ICH and use of Factor Xa inhibitors. The degree of hematoma expansion within 12 hours of drug administration on non-contrast head CT was categorized as 'excellent' (<20% increase in hematoma size), ‘good' ( > 20-<35%), and 'poor' ( > 35%). Secondary outcomes included dosage, median length of stay, mortality, modified Rankin score (mRS), discharge disposition, and ischemic complications.

Results: Fifteen patients received Aα (5=lobar, 5=deep, 5= multicompartment). One patient with a presumed deep hemorrhage was excluded because subsequent imaging showed chronic mineralization. The predominant etiologies were hypertension (40%), amyloid angiopathy (26.6%) and trauma (13.3%). The median age was 86 years (IQR 19) and median ICH score on arrival was 2 (IQR 2), and median hematoma size was 14.3 mL (IQR 34.5). Most patients (71.4%) received the low dose formulation. Based on hematoma expansion, 64.3%, 14.3% and 21.4% of patients achieved excellent, good and poor hemostasis, respectively. Reduction in hematoma size was seen in 20% (n=3) while 13.3% (n=2) patients had no expansion. Median ICU and hospital length of stays were 2.0 days (IQR 2.2) and 6.6 days (IQR 9.78) respectively. Mortality was 28.6% and median mRS upon discharge was 4 (IQR 2), with most patients discharged to rehabilitation facilities (60%). There were no ischemic complications.

Conclusion: Our experience is consistent with the results of the ANNEXA 4 study with 78.6% of patients showing excellent or good hemostasis. These results led to improved clinical outcomes, with 60% of patients being discharged to rehabilitation. These data support the efficacy of this treatment paradigm in a real-world setting.

Abstract TP161: Sexual Dysfunction in Mild Stroke

Background: Stroke impacts several aspects of patients’ lives and sexual dysfunction post stroke has been reported in 40%-50% of patients. Current investigations have revealed links to depression, however this has not been examined specifically in mild stroke.

Objective: To determine prevalence and factors associated with sexual dysfunction after mild stroke

Design/methods: A retrospective study was conducted on a self-report questionnaire completed by a convenience sample of patients during a hospital follow-up appointment in the stroke clinic. Patients were asked about sexual dysfunction after stroke and if yes, to specify the cause: safety concern, physical limitation, consequence or change in libido. In addition, patients completed a PHQ-9 to measure depression, Fatigue Assessment Scale (FAS), and the Montreal Cognitive Assessment (MoCA). A thorough review of clinical history including NIHSS, mRS and demographics was completed by researchers. Descriptive statistics were used to identify and understand the patient population. Mild stroke was defined as NIHSS ≤ 5.

Results: In our study of 135 patients, 21 (16%) did not respond to the sexual dysfunction question. Of the 114 who responded, only 11 (9.6%) reported sexual dysfunction and 9 (81%) attributed their sexual dysfunction to physical limitations. Descriptive statistics of the respondent subgroup indicate that the cohort was 59% male with a median (IQR) age of 64 (57,75) and that 52% were living with someone at the time. The mean NIHSS on discharge was 1 (IQR 0-3) and 77% were ischemic strokes. Few patients experienced post stroke depression (21.9%, N=25), and the cohort reported low levels of fatigue (median FAS=19). Low incidence and response rates precluded an analysis of specific predictors in this cohort.

Conclusion: Physical limitations are reported to be the main cause of post stroke sexual dysfunction. Roughly 1 in 10 patients with mild stroke reported experiencing sexual dysfunction, however twice as many did not respond to the question. Therefore, the true incidence is unclear, prompting the need for further investigation on post stroke sexual dysfunction in mild stroke.

Abstract TP250: Reducing Treatment Time in Acute Ischemic Stroke by Utilizing a Kaizen Model

Introduction: Treating patients suspect of acute stroke requires efficient multidisciplinary teamwork in order to provide appropriate care. Several “Lean Management” methods have been applied in a variety of healthcare settings. Kaizen, meaning “improvement” in Japanese is a tool which emphasizes empowerment of employees on creating value streams to identify and reduce wastes, synchronize work flow processes, manage variability, and devise communication and sustainability plans. We report on the use of this methodology to improve our acute stroke care metrics.

Objective: To optimize the management of the acute stroke patient flow process from the emergency department ED to destination therapy by applying the Kaizen methods.

Methodes: This is a quality improvement project designed to evaluate the efficiency of the new workflow model for acute stroke that was put into place June 2018 at Hartford Hospital. A 5 day event spent involving all stakeholders from patient registration to destination treatment (IV or mechanical thrombolytic therapy) were conducted. During this event, a time work flow process for the management of suspected stroke patients was identified and an appropriate plan was formulated to reduce times. The following parameters were utilized: Door to CT scanner time (DTCT), Door to drug (IV-tPA) (DTD), and Door to mechanical thrombectomy puncture time (DTP). We included all stroke patients presenting to the ED and treated at our institution 6 months prior and post implementation. A non-parametric analysis was utilized.

Results: A total of 135 patients were included in this analysis, 60 prior and 75 post Kaizen. Improvement across all parameters was observed post Kaizen with an average reduction time of DTCT 5 min, DTD 5min, and DTP 22min. The median times pre-Kaizen were; DCT 14min IQR 6-27, DTD 55min IQR 43.5-77.5, and DTP 128min IQR 88-151. The median times post-Kaizen were; DTCT 9min IQR 6-23, DTD 50.5min IQR 37-64, and DTP 106 min IQR 83.5-141.5.

Conclusion: By utilizing the Kaizen, we identified numerous opportunities to reduce variability, standardize workflow processes, and ultimately reduce all parameter times. As time is brain, reducing pretreatment times favorably impacts patients’ outcomes and reduces morbidity in stroke.

Abstract TP365: Stroke Nurse Navigator Improves Post-Acute Transition of Care

Background: Post stroke care is multifaceted and should not end at hospital discharge. Patients often lack understanding of the importance of outpatient care to prevent secondary stroke.

Objective: To demonstrate the positive impact of a stroke nurse navigator in improving the post-acute transition of care by promoting outpatient follow up after hospitalization.

Methods: We retrospectively reviewed all patients discharged from our comprehensive stroke center (excluding hospice) with a primary diagnosis of ischemic or hemorrhagic stroke from January -December 2018, yielding 685 patients. We evaluated whether or not our nurse navigator influenced three aspects of follow up: if stroke clinic appointment was made before discharge, if patient attended the appointment and if patient called the clinic after discharge. Four categories were used based on level of navigator contact with the patient: (SC) Seen in-house and called within 30 days after discharge, (S) Seen only, (C) Called only or (N) No navigator contact. Chi-square test of proportions was used to evaluate the statistical significance among all four groups.

Results: Out of the 685 patients, 77.5% (n=531) were scheduled for clinic follow-up before discharge, 60.7% (n=416) attended the appointment and 20% called after discharge (n=137). The distribution of navigator contact level was (SC) 26.7%, (S) 17.5%, (C) 19.3% and (N) 36.5%. Both seeing and calling the patient was proven to be the most effective in all three areas: appointment made prior to discharge (SC) 89.6%, (S) 82.5%, (C) 74.2%, (N) 68% ( p=<0.001 ); patient attended the appointment (SC) 68.9%, (S) 60%, (C ) 65.9%, (N) 52.4% ( p=0.001 ) and patient called the clinic after discharge (SC) 26.2%, (S) 15.8%, (C ) 23.5%, (N) 15.6% ( p=0.02 ). Of interest, patients who were only called but not seen were more likely to attend the appointment or call the clinic as compared to being seen alone.

Conclusion: Contact with our nurse navigator increased post-acute follow up in our stroke clinic. An increased number of patient calls associated with navigator interaction showed these patients had a better understanding of the need for continued care. The nurse navigator improves continuity of post-acute care.

Caprini score and surgical times linked to the risk for venous thromboembolism after robotic-assisted radical prostatectomy

OBJECTIVE

To evaluate the Caprini score as an independent predictor of venous thromboembolism (VTE) in patients undergoing robotic-assisted radical prostatectomy (RARP) and to identify appropriate cut-points for clinical use.

MATERIAL AND METHODS

We performed a retrospective review of patients who underwent RARP for prostate cancer between December 2003 and February 2016. VTE cases developed the condition within 90 days of discharge. The control group was comprised of patients whose RARP most closely preceded and followed each VTE case in time and who were matched on lymph node dissection and surgeon. The Caprini score was calculated for each patient, and the groups were compared on a number of clinical variables. Multiple logistic regression was used to evaluate whether the Caprini score was an independent predictor of VTE. Receiver operating characteristics (ROC) curves were used to establish appropriate clinical cutpoints.

RESULTS

A total of 3719 patients underwent RARP during the study period. A total of 52 (1.4%) of patients met the criteria for cases. Data were available for 97 patients who met the criteria for controls. Multiple logistic regression indicated that the Caprini score and operative time were independently both significant predictors of VTE (p=0.005 and p=0.044, respectively). ROC indicated that the Caprini score showed a significant but moderate relationship to VTE (area under curve [AOC]=0.64; p=0.004). A Caprini score >6 was the best arithmetic balance for sensitivity (61.5; 95% confidence interval [CI]: 47.0-74.7) and specificity (59.8; 95% CI: 49.3-69.6).

CONCLUSION

The Caprini score predicts postoperative VTE in patients undergoing RARP.

Impact of Preoperative Specialty Consults on Hospitalist Comanagement of Hip Fracture Patients

BACKGROUND

Hip fractures typically occur in frail elderly patients. Preoperative specialty consults, in addition to hospitalist comanagement, are often requested for preoperative risk assessment.

OBJECTIVE

Determine if preoperative specialty consults meaningfully influence management and outcomes in hip fracture patients, while being comanaged by hospitalists DESIGN: Retrospective cohort study SETTING: Tertiary care hospital in Connecticut PATIENTS: 491 patients aged 50 years and older who underwent surgery for an isolated fragility hip fracture, defined as one occurring from a fall of a height of standing or less.

INTERVENTION

Presence or absence of a preoperative specialty consult MEASUREMENTS: Time to surgery (TTS), length of hospital stay (LOS), and postoperative complications RESULTS: 177 patients had a preoperative specialty consult. Patients with consults were older and had more comorbidities. Most consult recommendations were minor (72.8%); there was a major recommendation only for eight patients (4.5%). Multivariate analysis demonstrates that consults are more likely to be associated with a TTS beyond 24 hours (Odds Ratio [OR] 4.28 [2.79-6.56]) and 48 hours (OR 2.59 [1.52-4.43]), an extended LOS (OR 2.67 [1.78-4.03]), and a higher 30-day readmission rate (OR 2.11 [1.09-4.08]). A similar 30-day mortality rate was noted in both consult and no-consult groups.

CONCLUSIONS

The majority of preoperative specialty consults did not meaningfully influence management and may have potentially increased morbidity by delaying surgery. Our data suggest that unless a hip fracture patient is unstable and likely to require active management by a consultant, such consults offer limited benefit when weighed against the negative impact of surgical delay.

Impact of Resilience on Outcomes of Total Knee Arthroplasty

BACKGROUND

Resilience, defined as the ability to bounce back from stress, has been suggested as a predictor of surgical outcomes. The purpose of this study is to examine the relationship between resilience and patient-reported outcomes following primary elective total knee arthroplasty (TKA). We hypothesized that patients exhibiting greater preoperative resilience would report better outcome scores.

METHODS

A prospective cohort of 153 patients (74 male, 79 female) undergoing primary elective TKA completed questionnaires preoperatively and at 3 and 12 months following their index procedure. The validated Brief Resilience Scale was used to evaluate resilience. Hierarchical multiple linear regression was used to analyze the effect of resilience on KOOS-JR (Knee Injury and Osteoarthritis Outcome Score JR) and PROMIS-10 (Patient-Reported Outcomes Measurement Information System) outcome scores.

RESULTS

At 12 months, the change in the coefficient of determination (R²) attributable to preoperative resilience was 0.101 (P < .001) and 0.204 (P < .001) for physical and mental health, respectively. Although there was expected improvement in KOOS-JR scores following TKA, the effect of baseline resilience for this outcome was not significant. When evaluating resilience measured concurrently, there was significant correlation with both 3-month and 12-month KOOS-JR and PROMIS-10 outcome scores.

CONCLUSION

Preoperative resilience is a significant predictor of overall physical and mental health outcomes at both 3 and 12 months. Greater concurrent resilience predicted better scores across all outcomes. These findings suggest that major elective surgery, like other traumatic events, can cause a change in resilience. Although functional improvements after TKA are expected, those patients who exhibit greater resilience at baseline are more likely to report an improved quality of life.

Migraine History: A Predictor of Negative Diffusion-Weighted Imaging in IV-tPA-Treated Stroke Mimics

BACKGROUND

Migraine, seizures, and psychiatric disorders are frequently reported as "stroke mimics" in patients with negative diffusion-weighted imaging (DWI) after IV-tPA. We sought to determine predictors of negative DWI in suspected stroke patients treated with IV-tPA.

METHOD

A retrospective case-control study encompassing all acute stroke patients treated with IV-tPA (at our hospital or "dripped and shipped") from January 2013 to December 2014 was con- ducted. A total of 275 patients were identified with 47 negative DWI cases and 228 positive DWI controls. Variables including demographic factors, stroke characteristics, and clinical comorbidities were analyzed for statistical significance. A multivariate logistic regression was performed (SPSS-24) to identify predictors of negative DWI.

RESULTS

Approximately 17% of patients had negative DWI after IV-tPA. Compared to controls, migraine history independently predicted negative DWI (odds ratio [OR] 5.0 95% confidence interval [CI] 1.03-24.6, P = .046). Increasing age (OR .97 95% CI .94-.99, P = .02) and atrial fibrillation (OR .25 95% CI .08-.77, P = .01) predicted lower probability of negative DWI. Gender, admission NIHSS, treatment location, preadmission modified Rankin scale, diabetes mellitus, hypertension, hyperlipidemia, symptom side, seizure history, and psychiatric history did not predict negative DWI status.

CONCLUSIONS

In our study, roughly 1 in 6 patients treated with IV-tPA were later found to be stroke mimics with negative DWI. Despite a high proportion of suspected stroke mimics in our study, only preexisting migraine history independently predicted negative DWI status after IV-tPA treatment in suspected stroke patients.

Impact of Urology Resident Involvement on intraoperative, Long-Term Oncologic and Functional Outcomes of Robotic Assisted Laparoscopic Radical Prostatectomy

OBJECTIVE

To evaluate the impact of resident involvement in robot assisted laparoscopic prostatectomy on oncologic, functional, and intraoperative outcomes, both short and long term.

METHODS

We queried our prospectively maintained database of prostate cancer patients who underwent robotic-assisted laparoscopic prostatectomy from November 20, 2007 to December 27, 2016. We analyzed cases performed by 1 surgeon on a specific day of the week when the morning case involved at least 1 resident (R) and the afternoon case involved the attending physician only (nonresident [NR]). We compared R versus NR on a number of clinical, perioperative, and oncological outcomes.

RESULTS

A total of 230 NR and 230 R cases met inclusion criteria and were included in the analysis. Over one third (36.7%) of the NR group was Gleason 4+3 (Grade Group 3) or higher, relative to 25.9% of the R group, P = .015. Median operative time (OT) was significantly longer for R versus NR (200 minutes versus 156 minutes, P<.001) as was robotic time (161 minutes versus119 minutes, P<.001). No significant differences were noted for any other measure. Median follow-up for oncological outcomes was 30 and 33.5 months for NR and R, respectively (P= .3). Median OT and median estimated blood loss were both significantly greater in later years relative to the earlier years for R (2012-2016 versus 2007-2011; P< .001 for OT; P= .041 for median estimated blood loss) but not for NR.

CONCLUSION

Neither safety nor quality is diminished by R involvement in robot assisted laparoscopic prostatectomy.

Prostate cancer genomics: comparing results from three molecular assays

INTRODUCTION

OncotypeDx, Prolaris, and Decipher have each been validated to predict outcomes and guide treatment for patients with clinically localized prostate cancer, but they have yet to be compared to one another. Here we assess the correspondence between the results of each.

MATERIALS AND METHODS

We performed a retrospective chart review to identify patients who underwent at least two of the three genomic tests at Hartford Hospital between 2014 and 2017. We used test-specific definitions of a favorable prediction for each to compare the percent agreement between each pair. Results were also compared to treatment recommendations based on current National Comprehensive Cancer Network (NCCN) guidelines. We compared pair-wise agreement using Cohen's kappa (K).

RESULTS

Twenty-two patients received at least two different genomic tests. For 12 patients who received both the Decipher and Prolaris, % agreement and K were 66.7 and 0.31 (p = .276), respectively. For 8 patients who received both Prolaris and Oncotype DX, % agreement and K were 75 and 0.39 (p = .168), respectively. Two patients received both Decipher and Oncotype DX, yielding 50% agreement and an incalculable K. For Prolaris versus NCCN, % agreement and K were 75 and .21, respectively (p = .117; n = 20). For Decipher versus NCCN, % agreement and K were 60 and .15, respectively (p = .268; n = 15). For Oncotype DX versus NCCN (n = 10), agreement was 50%, K was incalculable.

CONCLUSIONS

Notable differences exist in prognostic outcomes obtained from OncotypeDx, Prolaris, and Decipher.

Robot-assisted sleeve gastrectomy and Roux-en-y gastric bypass: results from the metabolic and bariatric surgery accreditation and quality improvement program data registry

BACKGROUND

A stronger evidence base is needed to more fully understand the precise role that robot-assisted (RA) approaches may play in bariatrics.

OBJECTIVE

To investigate the utilization and safety of RA-sleeve gastrectomy (RA-SG) and RA-Roux-en-Y gastric bypass (RA-RYGB) using data from the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program (MBSAQIP) registry.

SETTING

National Database.

METHODS

We queried the MBSAQIP 2015 through 2016 registry for patients who underwent primary conventional laparoscopic or RA-SG and RA-RYGB. We compared pre- and perioperative characteristics and 30-day outcomes using logistic regression where number of events met statistical guidelines.

RESULTS

We included 126,987 cases: conventional laparoscopic SG (n = 83,940), RA-SG (n = 6,780), conventional laparoscopic RYGB (n = 33,525), and RA-RYGB (n = 2,742). The RA significantly lengthened operation time by 24 and 23 minutes for SG and RYGB, respectively. Mortality and serious adverse events were similar for the 2 techniques. RA-SG was associated with higher rates of 30-day intervention (1.3% versus .8%, OR: 1.38, P < .05) and hospital stay >2 days (12.1% versus 9.3%, OR: 1.30, P < .001). RA-RYGB was associated with higher 30-day rates of reoperation (2.6% versus 2.0%, OR: 1.37, P < .05) and readmission (7.0% versus 5.8%, OR:1.21, P < .05) and lower rates of transfusion (0.62% versus 1.12%, OR: .54, P < .05) and hospital stay >2 days (15.7% versus 17%, OR: .89, P < .05).

CONCLUSION

RA is as safe as the conventional laparoscopic approach in terms of mortality and serious adverse events.

Return to work after robot-assisted laparoscopic prostatectomy versus radical retro-pubic prostatectomy

INTRODUCTION

We compared the return-to-work interval (RTWI) after radical retro-pubic prostatectomy (RRP) and robot-assisted laparoscopic prostatectomy (RALP) in men being treated for early-stage prostate cancer.

MATERIALS AND METHODS

We mailed a 28-item questionnaire to a random sample of 2,696 patients who either had RRP from 1995 to 2004 or RALP from 2004 to 2011.

RESULTS

We received analyzable questionnaires from 315 patients; 178 had RALP and 137 had RPP. The median RTWI was shorter in the RALP group than in the RRP group (3 versus 4 weeks, p = .016). The percent of subjects who had not returned to work 4 weeks after surgery was 23.6% for RALP and 38.2% for RRP (p = .010). In multivariate regression analysis, surgical approach was a significant predictor of RTWI independent of other social/clinical variables that were associated with either surgical approach or RTWI (p = .014).

CONCLUSION

Our data support a shortening of RTWI by RALP.

Three Territory Sign: An MRI marker of malignancy-related ischemic stroke (Trousseau syndrome)

Background

Multiple acute cerebral territory infarcts of undetermined origin are typically attributed to cardioembolism, most frequently atrial fibrillation. However, the importance of 3-territory involvement in association with malignancy is under-recognized. We sought to highlight the "Three Territory Sign" (TTS) (bilateral anterior and posterior circulation acute ischemic diffusion-weighted imaging [DWI] lesions), as a radiographic marker of stroke due to malignancy.

Methods

We conducted a single-center retrospective analysis of patients from January 2014 to January 2016, who suffered an acute ischemic stroke with MRI-DWI at our institution, yielding 64 patients with a known malignancy and 167 patients with atrial fibrillation, excluding patients with both to eliminate bias. All DWI images were reviewed for 3-, 2-, and 1-territory lesions. Chi-square test of proportion was used to test significance between the 2 groups.

Results

We found an association between the groups (malignancy vs atrial fibrillation) and the number of territory infarcts (p < 0.0001). Pairwise comparisons using the Holm p value adjustment showed no difference between 1- and 2-territory patterns (p = 0.465). However, the TTS was 6 times more likely observed within the malignancy cohort as compared to patients with atrial fibrillation (23.4% [n = 15] vs 3.5% [n = 6]) and was different from both 1-territory (p < 0.0001) and 2-territory patterns (p = 0.0032).

Conclusion

The TTS is a highly specific marker and 6 times more frequently observed in malignancy-related ischemic stroke than atrial fibrillation-related ischemic stroke. Evaluation for underlying malignancy in patients with the TTS is reasonable in patients with undetermined etiology.

Abstract TP72: Should Hypoperfusion Intensity Ratio Influence Patient Selection for Mechanical Thrombectomy?

Background: Current data utilizes clinical-radiographic mismatch (core and mismatch ratio) as patient selection criteria for mechanical thrombectomy in LVO. High HIR (Hypoperfusion Intensity Ratio) is known to correlate with core size, infarct growth and outcome though influence on patient selection has not been yet determined.

Hypothesis: Patients with High HIR and malignant profile (Tmax >10s greater than 50% of penumbra) indicative of fast growing infarct may influence final clinical outcome irrespective of reperfusion.

Methods: We retrospectively identified all AIS patients with LVO who underwent CTP imaging between January and June2018 within 24 hours from symptom onset. Demographics, CTP imaging variables, reperfusion status and outcomes (discharge NIHSS and mRS) were analyzed. HIR was dichotomized by proportion of greater and less than 0.5 into malignant vs favorable profile. Association with core size, infarct growth velocity, reperfusion (defined as TICI 2b or 3) and impact on outcomes was analyzed using Wilcoxon Ranked Sum tests for the (skewed) continuous and ordinal variables; chi-square test of proportion were used for categorical variables. The independent contribution of HIR and reperfusion predicting the major outcomes was assessed with logistic regression.

Results: A total of 67 patients with LVO were identified with a median age of 78 (IQR 62-87), NIHSS of 16 (IQR 11-21) and time from last seen normal to CT 404 minutes (IQR 113-734). Five patients were excluded due inadequate CTP data. Patients with high HIR (n=23) had a higher core size (median 39 cc; IQR 16-73) compared to 0 cc (IQR 0-12) than patients with low HIR (n=39; median 0; IQR 0-12) (p=<0.001) and faster Infarct growth rate 14.8 cc/hr (IQR 3.6-29.7) vs. 0 cc/hr (IQR 0-1.12) (p=<0.001). After adjusting for reperfusion, median discharge NIHSS was not significantly different (p=0.22) in groups with low vs high HIR, however in-hospital mortality differed (p=0.02).

Conclusion: Higher HIR and malignant profile is associated with larger index core size and faster growth rate. However, the influence of this profile on clinical outcomes after recanalization is yet to be established. Ongoing studies evaluating the utility of HIR on patient selection for thrombectomy are needed.

Abstract WP424: Identifying Gaps and Missed Opportunities for IV-Thrombolytic Treatment of Inpatient Stroke

Background: Inpatient stroke-codes have traditionally seen low treatment rates with IV-thrombolytic due do an abundance of stroke mimics and contraindications for treatment. However, data regarding missed treatment opportunities are lacking.

Objective: To identify the treatment gap and factors associated with missed treatment opportunities for inpatient strokes.

Methods: A retrospective chart review was performed identifying all inpatient stroke codes from March 2017 to March 2018. Clinical, radiographic and demographic patient data were collected. Primary analysis was performed between stroke vs. non-stroke final diagnosis. Dichotomous variables were analyzed using Chi-Square test of proportions and continuous variables with Wilcoxon Ranked Sum test. Significant factors were then tested in a multivariate logistic regression model for independence.

Results: Out of 211 codes, 36% (n=76) of patients had an acute stroke. An intracranial hemorrhage was present in 5.7% (n=12). Of the remaining 199 codes, 44% (n=87) were IV tPA eligible but only 3.4% (n=3) were treated. All treated patients had a confirmed stroke. Of the remaining 84 tPA-eligible patients, 44% (n=37) had >1 reason to hold treatment. The most frequent reason cited was NIHSS ≤4 in 40% (n=62), suspected metabolic encephalopathy in 23% (n=47) and abnormal blood pressure or blood sugar in 6.3% (n=13). From the eligible-but-untreated cohort, 82% (n=69) were stroke mimics while 18% (n=15) had strokes, constituting a missed treatment opportunity of 1 in 6 patients. Independent predictors of stroke were ejection fraction <30% (p=0.030, OR 3.06), post-operative status (p=0.003, OR 3.00), visual field cut (p=0.048, OR 2.61) and facial droop (p=0.048, OR 2.07). Sedative use (p=0.013, OR 0.33) and seizure at onset (p=0.015, OR 0.07) were inversely predictive of stroke.

Conclusion: In the inpatient setting, 1 in 3 codes are true strokes and treatment rates with IV thrombolytic are low with a missed treatment opportunity of 1 in every 6 eligible patients. The most frequent reasons for not treating include NIHSS ≤4 and suspicion of metabolic encephalopathy. Identifying patients with NIHSS ≤4 and knowing predictors of true stroke can help narrow this treatment gap.

Abstract TP409: Prevalence and Predictors of Stroke in Patients With Short-Term Mechanical Circulatory Support Devices: A Single-Center Study

Introduction: Short-term mechanical circulatory support devices (ST-MCS) include intra-aortic balloon-pump (IABP), extracorporeal membrane oxygenation (ECMO) and the CentriMag® and Impella® ventricular assist systems (VAS). Despite an exponential increase in their use, data regarding stroke prevalence and predictors are lacking.

Objective: To identify the prevalence and predictors of stroke in ST-MCS.

Methods: Data was collected prospectively into a database from January 2016 to June 2018 and retrospectively extracted and analyzed. Primary analysis was performed between acute-stroke vs. non-stroke diagnoses. Dichotomous and continuous variables were analyzed using Chi-Square test of proportions and Wilcoxon Ranked Sum test respectively.

Results: Out of 203 ST-MCS-patients [IABP 31.5% (n=64), Impella 24.6% (n=50), ECMO 31% (n=63) and CentriMag®VAS 12.8% (n=26)], 8.4% (n=17) had an acute stroke. Among them 6.4% (n=13) had ischemic stroke and 1% (n=2) had hemorrhagic stroke, with 1% (n=2) having both. CentriMag®VAS had a higher stroke rate than the other devices (23.1% [n=6] vs. 6.2% [n=11]; p=0.011, OR 4.53). Predictors of stroke in all patients were central cannulation (p=0.044, OR 3.08), duration >4 days (p=0.025, OR 3.21) and use of another ST-MCS device before primary device (p=0.043, OR 1.45). Flow-rate (p=0.86) and catheter size (p=0.15) did not predict stroke. Only 1 patient was eligible for thrombolytic therapy and received IV tPA, with the most common reasons to hold treatment being unknown last-seen-normal (n=8), coagulopathy (n=2) and established infarct on head CT (n=2). A large vessel occlusion was present in 20% (n=3), but none underwent a mechanical thrombectomy due of established infarction. All hemorrhagic strokes and 47% (n=7) ischemic strokes led to withdrawal of care.

Conclusion: About 1 in 12 patients placed on a ST-MCS device may have an acute stroke, but this can be as high as 1 in 5 with the use of the CentriMag®VAS. Factors such as central cannulation, duration >4 days and use of another ST-MCS device before the primary device may be predictive of acute stroke in these patients. Further research in the identification of such predictors, in conjunction with early symptom recognition could help improve treatment rates.

Abstract WP368: CT Perfusion and Radiation Exposure in Acute Ischemic Stroke: A Quality Improvement Study

Introduction: Treatment of acute ischemic stroke has undergone a paradigm shift after recently published trials DAWN & DEFUSE-3. Imaging techniques like CT perfusion (CTP) can identify eligible candidates who may benefit from intervention, however, this entails screening patients with CTP, resulting in higher radiation & contrast exposure.

Methods: Acute ischemic stroke patients admitted between Sept 2017 & Feb 2018, who underwent CTP screening at Hartford Hospital were considered for this study. Patients admitted between April & Sept 2017 who underwent CT Angiogram (CTA) Head alone for screening were considered for controls. A standard CTP algorithm was utilized, with image acquisition time initially set at 60 secs and later reduced to 45 secs. Imaging (CTP RAPID, CTA) related variables were analyzed. SPSS was used for statistical analysis.

Results: We assessed 50 patients who underwent CTP screening (CTP group) in the extended stroke window (6-24 hours) and 45 patients who served as controls. In the CTP group, 90% scans were of optimal quality, whereas 10% were deemed suboptimal. For CTP associated radiation exposure, the median dose length product (DLP) was 1420.3 mGy-cm (IQR 1420 to 1775.31 mGy-cm). The median DLP was 2401.89 mGy-cm in patients with 60 sec CTP acquisition time, significantly higher compared to 1420.3 mGy-cm in patients with 45 sec acquisition time (p<0.001). The median total radiation exposure (excluding endovascular intervention) during entire hospitalization for the CTP group was 5260 mGy-cm as compared to 3222.27 mGy-cm for controls, which was statistically significant (p<0.001). No radiation related adverse events were observed in the CTP group. In terms of contrast exposure, there was no significant difference in Sr creatinine obtained at day one or at discharge when compared to baseline (p=0.46). Amongst 50 patients screened with CT perfusion, 16 patients (32%) were deemed eligible for endovascular therapy.

Conclusions: Although CT perfusion screening may result in higher radiation exposure, the perfusion protocols may be optimized to reduce the amount of radiation imparted to patients without compromising on the scan quality. Despite additional contrast exposure, no significant effects were observed on the renal function.