An analysis of renal dysfunction in 1511 patients with fractured neck of femur: the implications for peri-operative analgesia

Comparison of patient demographics and patient-specific risk factors for readmissions following open reduction and internal fixation for acetabular fractures

PURPOSE

Acetabular fractures are highly complex injuries often resulting from high-energy trauma. The gold standard treatment for these injuries has become open reduction internal fixation (ORIF). The purpose of this study is to further this understanding and investigate how (1) patient demographics and (2) patient-specific risk factors affect 90-day readmission rates.

METHODS

A retrospective, nationwide query of private insurance database from January 1st, 2010 to October 31st, 2020 was performed using ICD-9, ICD-10, and CPT codes. Patients who underwent acetabular ORIF and were readmitted within 90 days following index procedure were included, patients who were not readmitted served as controls. Patients were divided by demographics and specific risk factors associated with readmission.

RESULTS

The query yielded a total of 3942 patients. Age and sex were found to be non-significant contributing risk factors to 90-day readmissions. Data also showed that statistically significant comorbidities included arrhythmia, cerebrovascular disease, coagulopathy, fluid and electrolyte abnormalities, and pathologic weight loss.

CONCLUSION

This study illustrated how several patient-specific risk factors may contribute to increased 90-day readmission risk following acetabular ORIF. A heightened awareness of these comorbidities in patients requiring acetabular ORIF is required to improve patient outcomes and minimize rates of readmission. Further investigation is needed to improve patient outcomes, and increase awareness of potential post-operative complications in these higher-risk patient populations.

A retrospective, observational, single-centre, cohort database analysis of the haemodynamic effects of low-dose spinal anaesthesia for hip fracture surgery

Background

Careful administration of either spinal (intrathecal) or general anaesthesia probably has a greater impact on outcomes after hip fracture surgery than which method is used per se. Intraoperative hypotension is associated with poorer outcomes, but appears less prevalent using lower doses of spinal anaesthesia.

Methods

In this observational single-centre study, intraoperative noninvasive blood pressure data were analysed from 280 patients undergoing unilateral hip fracture surgery after the administration of hyperbaric spinal bupivacaine 0.5%, 1.3 ml (0.65 mg).

Results

Mean cohort mean arterial pressure (MAP) remained within 10% of baseline (spinal injection) MAP for 97/98 (99.0%) subsequent aggregated 1-min recording intervals. The prevalences of lowest MAP <70 mm Hg and <55 mm Hg were significantly lower than historical equivalents (Anaesthesia Sprint Audit of Practice 1 and 2) (52.9% and 10.4% vs 71.9% and 23.8%, respectively, both <0.0001). The proportions of 10 551 MAP readings <70 mm Hg and <55 mm Hg were 6.7% and 0.4%, respectively. Forty-five (16.1%) patients had relatively persistent hypotension (MAP ≤70 mm Hg for five or more intraoperative readings), and were statistically more likely to be frail (Nottingham Hip Fracture Score ≥7/10, 37.8% vs 19.6%, P=0.0109) and be taking alpha-/beta-blockers (44.4% vs 24.3%, P=0.0099) than the remaining 'normotensive' cohort. Surgical anaesthesia remained effective for up to 190 min, with only one patient requiring supplemental local anaesthesia during skin closure.

Conclusions

Low doses of hyperbaric spinal 0.5% bupivacaine (1.3 ml, 6.5 mg) are associated with minimal reductions in blood pressure during surgery and provide adequate duration of surgical anaesthesia. Randomised comparisons of lower vs higher/standard doses of spinal anaesthesia are now required to confirm outcome benefits in this vulnerable patient group.

Clinical trial registration

NCT05799300.

Comparison of Efficacy and Safety of Transdermal Buprenorphine Patch and Conventional Analgesics in Intra-capsular Femur Neck Fracture Post Hemiarthroplasty

BACKGROUND

One of the most common fractures in the elderly population is a fracture of the neck of femur. Effective post-operative analgesia is a major challenge. Age-related co-morbidities restrict the choice of analgesics. The purpose of this study was to compare the efficacy and safety of transdermal buprenorphine [TDB] patch and conventional analgesics following hemiarthroplasty for intra-capsular fracture neck of femur.

MATERIALS AND METHODS

This was a prospective, randomized control study done in 60 patients undergoing hemiarthroplasty for intra-capsular fracture neck of femur over a period of 2 years. Patients were randomized in 2 groups. Group A received a combination of IV paracetamol and tramadol for first 48 h followed by oral formulation. In Group B patients, a transdermal buprenorphine patch of 5 mcg/h was applied at the beginning of surgery and was continued 2 weeks post-operative.Pain score by VAS was observed both at rest and on movement and followed up till 14 days post-operative. Primary target was to maintain a VAS ≤ 4. Rescue analgesic was given if the VAS was ≥ 6. Secondary targets were number of rescue analgesics required, adverse reactions and complications if any.

RESULTS

Group B had significantly lower pain scores at rest and during movement [p value 0.0012 to ≤ 0.0001], so was rescue analgesia requirement. No significant side effects were seen in TDB group.

CONCLUSION

TDB patch is safe and provides superior analgesia and compliance as compared to conventional analgesics in the post-operative period in proximal femur fracture surgeries.

Nonopioid Analgesics for the Perioperative Geriatric Patient: A Narrative Review

Management of acute perioperative pain in the geriatric patient can be challenging as the physiologic and pharmacokinetic changes associated with aging may predispose older patients to opioid-related side effects. Furthermore, elderly adults are more susceptible to postoperative delirium and postoperative cognitive dysfunction, which may be exacerbated by both poorly controlled postoperative pain and commonly used pain medications. This narrative review summarizes the literature published in the past 10 years for several nonopioid analgesics commonly prescribed to the geriatric patient in the perioperative period. Nonopioid analgesics are broken down as follows: medications prescribed throughout the perioperative period (acetaminophen and nonsteroidal anti-inflammatory drugs), medications limited to the acute perioperative setting (N-methyl-D-aspartate receptor antagonists, dexmedetomidine, dexamethasone, and local anesthetics), and medications to be used with caution in the geriatric patient population (gabapentinoids and muscle relaxants). Our search identified 1757 citations, but only 33 specifically focused on geriatric analgesia. Of these, only 21 were randomized clinical trials' and 1 was a systematic review. While guidance in tailoring pain regimens that focus on the use of nonopioid medications in the geriatric patient is lacking, we summarize the current literature and highlight that some nonopioid medications may extend benefits to the geriatric patient beyond analgesia.

Acute kidney injury risk in orthopaedic trauma patients pre and post surgery using a biomarker algorithm and clinical risk score

Acute kidney injury (AKI) after major trauma is associated with increased mortality. The aim of this study was to assess if measurement of blood biomarkers in combination with clinical characteristics could be used to develop a tool to assist clinicians in identifying which orthopaedic trauma patients are at risk of AKI. This is a prospective study of 237 orthopaedic trauma patients who were consecutively scheduled for open reduction and internal fixation of their fracture between May 2012 and August 2013. Clinical characteristics were recorded, and 28 biomarkers were analysed in patient blood samples. Post operatively a combination of H-FABP, sTNFR1 and MK had the highest predictive ability to identify patients at risk of developing AKI (AUROC 0.885). Three clinical characteristics; age, dementia and hypertension were identified in the orthopaedic trauma patients as potential risks for the development of AKI. Combining biomarker data with clinical characteristics allowed us to develop a proactive AKI clinical tool, which grouped patients into four risk categories that were associated with a clinical management regime that impacted patient care, management, length of hospital stay, and efficient use of hospital resources.

Analysis of the risk factors of acute kidney injury after total hip or knee replacement surgery

Background

Postoperative acute kidney injury (AKI), which increases the risk of postoperative morbidity and mortality, poses a major concern to surgeons. We conducted this study to analyze the risk factors associated with the occurrence of AKI after orthopedic surgery.

Methods

This was a retrospective study that included 351 patients who underwent total hip or knee replacement surgery at Inje University Haeundae Paik Hospital between January 2012 and December 2016.

Results

AKI occurred in 13 (3.7%) of the 351 patients. The patients’ preoperative estimated glomerular filtration rate (eGFR) was 66.66±34.02 mL/min/1.73 m² in the AKI group and 78.07±21.23 mL/min/1.73 m² in the non-AKI group. The hemoglobin levels were 11.21±1.65 g/dL in the AKI group and 12.39±1.52 g/dL in the non-AKI group. Hemoglobin level was related to increased risk of AKI (odds ratio [OR], 0.13; 95% confidence interval [CI], 0.02–0.68; p=0.016). Administration of crystalloid or colloid fluid alone and the perioperative amount of fluid did not show any significant relationship with AKI. Further analysis of the changes in eGFR was performed using a cutoff value of 7.54. The changes in eGFR were significantly related to decreased risk of AKI (OR, 0.74; 95% CI, 0.61–0.89; p=0.002).

Conclusion

Renal function should be monitored closely after orthopedic surgery if patients have chronic kidney disease and low hemoglobin level. Predicting the likelihood of AKI occurrence, early treatment of high-risk patients, and monitoring perioperative laboratory test results, including eGFR, will help improve patient prognosis.

Kidney Function Modifies the Effect of Intraoperative Opioid Dosage on Postoperative Delirium

BACKGROUND

There are few studies demonstrating how kidney function affects the risk of developing delirium in older adult surgical patients administered opioids. This study determined whether baseline kidney function influences the relationship between morphine equivalent dose and the development of delirium on postoperative day (POD) 2 in patients with hip fracture.

METHODS

This retrospective study analyzed emergency department (ED) estimated glomerular filtration rate (eGFR), perioperative serum creatinine, intravenous morphine equivalents, and POD2 delirium assessment by the Confusion Assessment Method in 652 patients aged 65 years or older without preoperative delirium. ED eGFR was used to divide subjects into groups by presence or absence of chronic kidney disease (CKD), and associations of opioid dose with POD2 delirium were compared using multivariable logistic regression.

RESULTS

POD2 delirium incidence was 29.8% (N = 194). Intraoperative and postanesthesia care unit (PACU) morphine equivalent dosage as well as ED eGFR were similar comparing patients with and without POD2 delirium. Age, American Society of Anesthesiologists status, and dementia were associated with delirium on POD2. The odds of POD2 delirium increased significantly with increase of intraoperative opioid in patients with CKD (odds ratio = 1.6; 95% confidence interval = 1.2-2.2), but not in patients without CKD (P-interaction = .04). PACU or POD1 opioid doses were not associated with POD2 delirium after covariate adjustment.

CONCLUSION

This study suggests that incremental increases in intraoperative opioids combined with CKD increase odds of POD2 delirium after hip fracture repair, compared with patients without CKD.

Effect of Kidney Disease on Hemiarthroplasty Outcomes After Femoral Neck Fractures

OBJECTIVE

To compare the outcomes of patients with predialysis chronic kidney disease (CKD) or end-stage renal disease (ESRD) with the outcomes of patients with no kidney disease after hemiarthroplasty (HA) for femoral neck fractures (FNF).

DESIGN

Retrospective review utilizing the Nationwide Readmissions Database.

SETTING

National database incorporating inpatient data from 22 states.

PATIENTS

Using the Nationwide Readmissions Database, 214,399 patients who underwent HA after FNF between 2010 and 2014 were identified and divided into 3 groups using ICD-9 diagnosis codes: no kidney disease (n = 176,300, 82%), predialysis CKD (n = 34,400, 16%), and ESRD (n = 3,698, 2%).

INTERVENTION

HA for FNF.

MAIN OUTCOME MEASUREMENT

Mortality, blood transfusion, and postoperative complications during index hospitalization. Hospital readmission, postoperative dislocation, periprosthetic fracture, and revision surgery within 90 days of surgery.

RESULTS

Compared to patients with no kidney disease, ESRD patients had an increased risk of mortality [odds ratio (OR) = 3.76, 95% confidence interval (CI), 2.95-4.78], blood transfusion (OR = 2.35, 95% CI, 2.08-2.64), and postoperative complications (OR = 1.64, 95% CI, 1.45-1.86) during the index hospitalization as well as an increased risk of 90-day hospital readmission (OR = 3.09, 95% CI, 2.72-3.50). Interestingly, even patients with predialysis CKD had an increased risk of mortality (OR = 1.80, 95% CI, 1.59-2.05), blood transfusion (OR = 1.66, 95% CI, 1.59-1.75), and postoperative complications (OR = 2.37, 95% CI, 2.25-2.50) during the index hospitalization as well as an increased risk of 90-day hospital readmission (OR = 1.43, 95% CI, 1.37-1.51).

CONCLUSIONS

This retrospective cohort study demonstrates that both ESRD and CKD patients have worse outcomes compared to patients with no kidney disease after HA for FNF.

LEVEL OF EVIDENCE

Prognostic Level III. See instructions for authors for a complete description of levels of evidence.

A Comprehensive Review of Analgesia and Pain Modalities in Hip Fracture Pathogenesis

PURPOSE OF REVIEW

Hip fracture is common in the elderly population, painful and costly. The present investigation was undertaken to review epidemiology, socio-economic and medical implications, relevant anatomy, and anesthetic and pain modalities of hip fracture.

RECENT FINDINGS

A literature search of PubMed, Ovid Medline, and Cochrane databases was conducted in December 2018 to identify relevant published clinical trials, review articles, and meta-analyses studies related to anesthetic and pain modalities of hip fracture. The acute pain management in these situations is often challenging. Common issues associated with morbidity and mortality include patients' physiological decrease in function, medical comorbidities, and cognitive impairment, which all can confound and complicate pain assessment and treatment. Perioperative multidisciplinary and multimodal approaches require medical, surgical, and anesthesiology teams employing adequate preoperative optimization. Reduction in pain and disability utilizing opioid and non-opioid therapies, regional anesthesia, patient-tailored anesthetic approach, and delirium prevention strategies seems to ensure best outcomes.

Efficacy of a multidisciplinary approach on postoperative morbidity and mortality of elderly patients with hip fracture

STUDY OBJECTIVE

We evaluated the efficacy of a multidisciplinary approach to reduce postoperative complications and 1-year mortality in patients, undergoing hip fracture surgery and the impact of surgical delay on mortality.

DESIGN

A non-randomized intervention study with a historical control group (CG).

SETTING

During the hospital stay of patients undergoing hip fracture surgery and subsequent follow-up during 12 months post-discharge.

PATIENTS

240 patients undergoing hip fracture surgery were included in the CG. 272 patients were included in the intervention group (IG).

INTERVENTIONS

CG patients received the standard care given at our hospital. Patients in the IG received a new model of multidisciplinary approach to care.

MEASUREMENTS

The following variables were collected: study group, age, gender, ASA physical status, comorbidity, type of fracture, type of anaesthesia, surgical delay, postoperative complications, hospital stay, destination after discharge and postoperative mortality.

MAIN RESULTS

512 patients (CG = 240; IG = 272). Mean age was 83.8 years in CG and 84.9 years in IG. Patients in the IG had a worse health status according to ASA (III-IV: 68.8% vs 51.7%; p < 0.001) and took more drugs (p < 0.001). Surgery was performed within 48 h of admission in 55.1% of patients of the IG (38.3% CG; p < 0.001). Incidence of postoperative complications (67.3% IG vs 76.2% CG p = 0.025) and hospital stay was shorter in the IG (p < 0.001). A surgical delay of >48 h (HR = 0.61; CI95%: 0.42-0.88) and allocation to the IG (HR = 0.64; CI95%: 0.44-0.93) were the protective factors for mortality.

CONCLUSIONS

The multidisciplinary approach could be associated with a decrease in postoperative complications, hospital stay and mortality. Surgical delay may not increase the risk of mortality. The main objective in the management of these patients should be the optimization of their general health status before surgery rather than surgical delay.

Should surgery be delayed in patients taking direct oral anticoagulants who suffer a hip fracture? A retrospective, case-controlled observational study at a UK major trauma centre

OBJECTIVE

To determine whether not waiting for the elimination of direct oral anticoagulants (DOACs) has an effect on the amount of perioperative bleeding in patients who undergo operative treatment of a hip fracture.

DESIGN

Observation, retrospective case-control study.

SETTING

A single UK major trauma centre.

PARTICIPANTS

Patients who sustained a hip fracture were identified using the National Hip Fracture Database (NHFD). All those found to be taking a DOAC at the time of fracture were identified (n=63). A matched group not taking a DOAC was also identified from the NHFD (n=62).

MAIN OUTCOME

Perioperative drop in haemoglobin concentration.

RESULTS

There was no relationship between admission to operation interval and perioperative change in haemoglobin concentration in patients taking DOACs (regression coefficient=-0.06 g/L/hour; 95% CI -0.32-0.20; p=0.64). No relationship was found between the time from admission to operation interval and the probability of transfusion (OR=0.94; 95% CI 0.85 to 1.90; p=0.16) or reoperation (OR=1.04; 95% CI 0.93 to 1.16; p=0.49). One mortality was recorded in the DOAC group within 30 days of admission, and this compared with five in the matched group of patients (p=0.2).

CONCLUSIONS

Delaying surgery in patients who sustain a hip fracture who are taking a DOAC drug has not been shown to reduce perioperative bleeding or affect their mortality in this study.

Acute kidney injury following spinal instrumentation surgery in children

AIM

To determine acute kidney in jury (AKI) incidence and potential risk factors of AKI in children undergoing spinal instrumentation surgery.

METHODS

AKI incidence in children undergoing spinal instrumentation surgery at British Columbia Children’s Hospital between January 2006 and December 2008 was determined by the Acute Kidney Injury Networ classification using serum creatinine and urine output criteria. During this specific time period, all patients following spinal surgery were monitored in the pediatric intensive care unit and had an indwelling Foley catheter permitting hourly urine output recording. Cases of AKI were identified from our database. From the remaining cohort, we selected group-matched controls that did not satisfy criteria for AKI. The controls were matched for sex, age and underlying diagnosis (idiopathic vs non-idiopathic scoliosis).

RESULTS

Thirty five of 208 patients met criteria for AKI with an incidence of 17% (95%CI: 12%-23%). Of all children who developed AKI, 17 (49%) developed mild AKI (AKI Stage 1), 17 (49%) developed moderate AKI (Stage 2) and 1 patient (3%) met criteria for severe AKI (Stage 3). An inverse relationship was observed with AKI incidence and the amount of fluids received intra-operatively. An inverse relationship was observed with AKI incidence and the amount of fluids received intra-operatively classified by fluid tertiles: 70% incidence in those that received the least amount of fluids vs 29% that received the most fluids (> 7.9, P = 0.02). Patients who developed AKI were more frequently exposed to nephrotoxins (non steroidal anti inflammatory drugs or aminoglycosides) than control patients during their peri-operative course (60% vs 22%, P < 0.001).

CONCLUSION

We observed a high incidence of AKI following spinal instrumentation surgery in children that is potentially related to the frequent use of nephrotoxins and the amount of fluid administered peri-operatively.

Acute and chronic kidney disease in elderly patients with hip fracture: prevalence, risk factors and outcome with development and validation of a risk prediction model for acute kidney injury

BACKGROUND

Hip fracture is a common injury in older people with a high rate of postoperative morbidity and mortality. This patient group is also at high risk of acute kidney injury (AKI) and chronic kidney disease (CKD), but little is known of the impact of kidney disease on outcome following hip fracture.

METHODS

An observational cohort of consecutive patients with hip fracture in a large UK secondary care hospital. Predictive modelling of outcomes using development and validation datasets. Inclusion: all patients admitted with hip fracture with sufficient serum creatinine measurements to define acute kidney injury. Main outcome measures - development of acute kidney injury during admission; mortality (in hospital, 30-365 day and to follow-up); length of hospital stay.

RESULTS

Data were available for 2848 / 2959 consecutive admissions from 2007-2011; 776 (27.2%) male. Acute kidney injury occurs in 24%; development of acute kidney injury is independently associated with male sex (OR 1.48 (1.21 to 1.80), premorbid chronic kidney disease stage 3B or worse (OR 1.52 (1.19 to 1.93)), age (OR 3.4 (2.29 to 5.2) for >85 years) and greater than one major co-morbidities (OR 1.61 (1.34 to 1.93)). Acute kidney injury of any stage is associated with an increased hazard of death, and increased length of stay (Acute kidney injury: 19.1 (IQR 13 to 31) days; no acute kidney injury 15 (11 to 23) days). A simplified predictive model containing Age, CKD stage (3B-5), two or more comorbidities, and male sex had an area under the ROC curve of 0.63 (0.60 to 0.67).

CONCLUSIONS

Acute kidney injury following hip fracture is common and associated with worse outcome and greater hospital length of stay. With the number of people experiencing hip fracture predicted to rise, recognition of risk factors and optimal perioperative management of acute kidney injury will become even more important.

Decreased glomerular filtration rate estimated by 2009 CKD-EPI equation predicts mortality in older hip fracture population

OBJECTIVE

We examined estimated glomerular filtration rate using the Chronic Kidney Disease Epidemiology equation (eGFRCDK-EPI), removal of urinary catheter during hospitalization and polypharmacy as predictors of mortality in older hip fracture patients.

METHODS

Population-based prospective data were collected on 1425 consecutive hip fracture patients aged ≥65 years. Outcome was mortality at one year. Independent variables were age, sex, body mass index, fracture type, American Society of Anesthesiology score, delay to surgery, urinary catheter removal during acute hospitalization, eGFRCDK-EPI, number of daily medications, diagnosis of memory disorder, prefracture mobility and living arrangements.

RESULTS

Of the 1425 patients, 567 (40%) had renal dysfunction on admission, 526 (37%) had their urinary catheters removed during hospitalization and 1177 (83%) were taking ≥4 medications regularly before the fracture. In the multivariate analyses with the Cox proportional hazards model adjusted simultaneously for all the independent variables, eGFRCDK-EPI 30-44ml/min/1.73m(2) (HR 1.91, 95% CI 1.44-2.52) and <30ml/min/1.73m(2) (HR 1.95, 95% CI 1.36-2.78), non-removal of the urinary catheter (HR 1.45, 95% CI 1.12-1.88) and large number of daily medications (4-10 HR 1.81, 95% CI 1.78-2.79, >10 HR 2.21, 95% CI 1.38-3.54) were associated with mortality.

CONCLUSIONS

In older hip fracture patients, moderate to severe level renal dysfunction measured by eGFRCDK-EPI, non-removal of urinary catheter before discharge and polypharmacy increase mortality after hip fracture. Careful assessment of renal function and medications and following the care protocols on urinary catheter removal are essential in the care of geriatric hip fracture patients.

The effectiveness and safety of two prophylactic antibiotic regimes in hip-fracture surgery

Antibiotic prophylaxis with cefuroxime can reduce the incidence of deep wound infection (DWI) in hip-fracture surgery, but may increase the risk of C. difficile infection (CDI). An alternative is gentamicin with beta-lactam for which a question exists around clinical effectiveness and safety, given the gentamicin-associated nephrotoxicity particularly in the elderly and narrower sensitivity spectrum. We compared 744 consecutive patients (group I-cefuroxime) with 756 in group II (gentamicin + flucloxacillin) who were well matched. There were 4 cases of CDI in the cefuroxime prophylaxis, whereas none in flucloxacillin plus gentamicin (group II). There was a statistically significant (p = 0.036) increased DWI rate in group II (2.5 %) as compared to group I (1.1 %). However, after controlling for age, gender, ASA grade, surgeon grade, implant type and type of anaesthesia, there was no statistically significant difference between the two groups (p = 0.146). 8.5 % of group I and 16.5 % of group II developed AKI post-operatively (p = 0.023); however, 79 % of group I and 80 % of in group II had complete resolution of AKI prior to their discharge. Further, a significant increase in inpatient deaths (p = 0.057) in group II was observed, but not at 30 days (p = 0.378).

Use of Nonopioid Analgesics and the Impact on Patient Outcomes

Although opioids are widely used for the management of pain in patients with hip fracture, these medications are known to have a wide range of adverse effects that can result in suboptimal outcomes or serious life-threatening complications. Common opioid-related adverse events include gastrointestinal effects, central nervous system effects, and respiratory depression. Hip fractures occur most frequently among the elderly-the very population that is most susceptible to the adverse effects of opioids and the risks of serious physiological complications. There has been much interest during recent years in identifying alternative analgesic approaches that are less opioid-dependent. There is good evidence to show that nerve blocks can be effective in managing the acute pain associated with hip fracture. However, sciatic and femoral nerve blocks seem to increase the risk of several clinically significant adverse events. A retrospective cohort study that examined the effectiveness of scheduled intravenous acetaminophen as part of the pain management protocol for hip fracture patients revealed significant improvement in pain scores, narcotic use, length of stay, and missed physical therapy sessions. Limited data exist in patients with hip fracture on the effects of infiltration of the surgical site with the local anesthetic agent, bupivacaine. However, extensive use of bupivacaine in hip arthroplasty surgery suggests that it may be highly beneficial in the patient with hip fracture.

The Doppler renal resistive index for early detection of acute kidney injury after hip fracture

BACKGROUND

Postoperative acute kidney injury (AKI) is linked to an increase in morbidity and mortality, particularly in elderly populations. This study's aim was to assess the accuracy of the Doppler renal resistive index (RI) in detecting AKI at an early stage after hip fracture surgery.

METHODS

This prospective single-centre study included 48 patients suffering hip fractures requiring surgery and who presented risk factors for the development of AKI. The RI was calculated preoperatively and postoperatively in patients without pain and with haemodynamic and respiratory stability. The occurrence of AKI was determined by measurements of serum creatinine according to AKIN criteria.

RESULTS

Twenty-nine patients (60%) developed AKI during the first five postoperative days, without need for dialysis. The RI was increased in patients who developed postoperative AKI 0.68 (0.67-0.71) vs. 0.72 (0.7-0.73); P=0.014 for the preoperative index; and 0.6 (0.58-0.68) vs. 0.74 (0.71-0.76); P<0.0001 for the postoperative index. A postoperative index superior or equal to 0.706 is a marker for the early detection of AKI with a high sensitivity and a high specificity (76% and 89%, respectively).

CONCLUSION

The calculation of the RI during the perioperative periods of hip fracture surgery predicts early and effectively the postoperative occurrence of AKI, thus allowing treatment to be anticipated so as to improve patient prognosis.

Acute pain management in the older person

The proportion of older people in society is growing steadily. This particular group is more likely to be admitted to hospital and a number of papers have highlighted the inadequate or inappropriate assessment and management of their pain, particularly in the perioperative period. Pain relief is possible for the majority of people. This paper aims to give an overview of the assessment and management of pain in older people.

Postoperative analgesia in patients older than 75 years undergoing intervention for per-trochanteric hip fracture: a single centre retrospective cohort study

The aim of this study was to compare the efficacy of four analgesia techniques on postoperative pain after per-trochanteric femur fracture. A retrospective cohort study was conducted on 131 consecutive patients older than 75 years enrolled in an 18-month period and who underwent per-trochanteric fracture repair under spinal analgesia. Patients received postoperative analgesia from: G1 (n = 36), intravenous analgesia on demand only; G2 (n = 28) administration of acetaminophen at fixed hours; G3 (n = 50) continuous morphine infusion; G4 (n = 17), preoperative echo-graphic guided femoral nerve block. Continuous opioid infusion failed to prevent the onset of pain at the end of the effects of subarachnoid anesthesia (rescue dose of analgesic in 48 % of patients in G3 vs. 22 % in G2 in the first day; p < 0.05). The greater effectiveness was achieved by preventing the onset of pain with drugs administered at time intervals (rescue dose of analgesic in 48 % of patients in G3, 58 % in G1 and 48 % in G4 vs. 22 % in G2 in the first day and rescue dose of analgesic in 32 % of patients in G3, 67 % in G1 and 76 % in G4 vs. 18 % in G2 in the second day; p < 0.05). Our study does not confirm the effectiveness of a single shot femoral nerve block on postoperative pain in per-trochanteric femur fracture (PAIN VAS score > 3 at t1 in 23 % of patients in G1 and 19 % in G4 vs. 10 % in G2 and G3; p < 0.05).

Common contra-indications and interactions of drugs in orthopaedic practice

Drug therapy forms an integral part of the management of many orthopaedic conditions. However, many medicines can produce serious adverse reactions if prescribed inappropriately, either alone or in combination with other drugs. Often these hazards are not appreciated. In response to this, the European Union recently issued legislation regarding safety measures which member states must adopt to minimise the risk of errors of medication. In March 2014 the Medicines and Healthcare products Regulatory Agency and NHS England released a Patient Safety Alert initiative focussed on errors of medication. There have been similar initiatives in the United States under the auspices of The National Coordinating Council for Medication Error and The Joint Commission on the Accreditation of Healthcare Organizations. These initiatives have highlighted the importance of informing and educating clinicians. Here, we discuss common drug interactions and contra-indications in orthopaedic practice. This is germane to safe and effective clinical care.

Incidence of acute kidney injury following total joint arthroplasty: a retrospective review by RIFLE criteria

Background

Total joint arthroplasty (TJA) is a common procedure with demand for arthroplasties expected to increase exponentially. Incidence of acute kidney injury (AKI) following TJA is reportedly low, with most studies finding an incidence of <2%, increasing to 9% when emergency orthopaedic patients are included.

Methods

Retrospective medical record review of consecutive primary, elective TJA procedures was undertaken at a large tertiary hospital (Alfred). Demographic, peri-operative and post-operative data were recorded. Factors associated with AKI (based on RIFLE criteria) were determined using multiple logistic regression.

Results

Between January 2011 and June 2013, 425 patients underwent TJA; 252 total knee replacements (TKR) and 173 total hip replacements (THR). Sixty-seven patients (14.8%) developed AKI, including 51 TKR. Factors associated with AKI (adjusting for known confounders) include increasing body mass index [adjusted odds ratio (AOR) 1.14; 95% CI: 1.07, 1.21], older age (AOR 1.07; 95% CI 1.02, 1.13) and lower pre-operative glomerular filtration rate (AOR 0.97; 95% CI 0.96, 0.99) and taking angiotensin-converting enzyme inhibitors (AOR 2.70; 95% CI 1.12, 6.48) and angiotensin-II receptor blockers (AOR 2.64; 95% CI 1.18, 5.93). In most patients, AKI resolved by discharge, however, only 62% of patients had renal function tests after discharge.

Conclusions

This study showed a rate of AKI of nearly 15% in our TJA population, substantially higher than previously reported. Given that AKI and long-term complications are associated, prospective research is needed to further understand the associated factors and predict those at risk of AKI. There may be opportunities to maximize the pre-operative medical management and mitigate risk.

Which patients are at risk for kidney dysfunction after hip fracture surgery?

BACKGROUND

Kidney dysfunction (KD) after hip fracture surgery is a major complication. However, the incidence and risk factors of KD in this population are unclear.

QUESTIONS/PURPOSES

We therefore (1) determined the incidence of KD in a large cohort of fracture patients, (2) identified preoperative risk factors predisposing to KD, and (3) determined the effect of KD on length of stay and subsequent function.

METHODS

Between April 2011 and June 2012, 450 patients (263 women) with a mean age of 73 years (range, 67-96 years) underwent surgery for hip fracture in our institution. We calculated incidence and retrospectively reviewed suspected predisposing risk factors. We report followup at 6 months.

RESULTS

The overall incidence of KD was 11% (n = 52). Forty-five patients (86%) developed acute KD and seven patients developed acute-on-chronic KD. Three of the 52 patients died during the followup time. Thirty-eight of the 52 patients (73%) regained their prior kidney function after treatment. An increased risk of KD was found in those with diabetes, shock during or after surgery, age, and preexisting KD. Mean length of stay was higher for patients with KD compared to those without: 9.6 versus 7.4, respectively. At 6 months, 39 of the 49 surviving patients (80%) were fully weightbearing.

CONCLUSIONS

Many patients at risk for postoperative KD can be identified and treated. Most patients recover from their KD and the majority return to full weightbearing.

Changes in hip fracture incidence, mortality and length of stay over the last decade in an Australian major trauma centre

PURPOSE

The aim of this study was to describe the population-based longitudinal trends in incidence, 30-day mortality and length of stay of hip fracture patients in a tertiary referral trauma centre in Newcastle, New South Wales, Australia, and identify the factors associated with increased 30-day mortality.

METHODS

A retrospective database and chart review was conducted to patients aged ≥65 years with a diagnosis of femoral neck or pertrochanteric fracture admitted to the John Hunter Hospital between 01 January 2002 and 30 December 2011. The main outcome measure was 30-day mortality; secondary outcome was acute length of stay.

RESULTS

There were 4,269 eligible patients (427±20 per year) with hip fractures over the 10-year study period. The absolute incidence increased slightly (p=0.1) but the age-adjusted rate decreased (p≤0.0001). The average age (83.5±7.1 years) and percentage of females (73.7%) did not change. Length of stay increased by a factor of 2.5% per year (p<0.0001). Thirty-day mortality decreased from 12.3% in 2002 to 8.20% in 2011 (p=0.0008). Independent risk factors associated with increased 30-day mortality were longer admissions (p<0.0001), increased age (p=0.005), dementia (p=0.01), male gender (p<0.0001), higher American Society of Anaesthesiologists score (p<0.0001), and longer time to operating theatre (p=0.002).

CONCLUSIONS

Despite the relative ageing of our population, a decrease in the age-standardised rate of fractured hip in elderly patients has seen the number of admissions remain unchanged in our institution from 2002 to 2011. There was a decrease in 30-day mortality, while length of stay increased.

Risk factors for acute kidney injury after hip fracture surgery in the elderly individuals

OBJECTIVE

We aimed to evaluate possible risk factors assocıated wıth acute kidney injury (AKI) after hip fracture surgery in the elderly individuals.

DESIGN

Level II diagnostic study, evidence obtained from prospective cohort study from 1 center with level 2, and 3 patients.

PATIENTS

A total of 165 patients (>65 years) with femoral neck fracture were enrolled in this prospective study between 2007 and 2010. Two patients were dropped for inadequate laboratory follow-up data. Patients with kidney failure or renal replacement therapy (RRT) history or AKI at admission were excluded.

INTERVENTION

Nephrology consultation was obtained from all patients at admission. All patients had undergone bipolar cemented hip arthroplasty that was performed by the same surgical team in all patients within 24 hours of fracture and admission under the same protocol.

MAIN OUTCOME MEASUREMENTS

Serum creatinine (SCr), urine output, and complete blood counts were evaluated at baseline and daily basis thereafter. The AKI was defined based on Acute Kidney Injury Network classification. Hospital charges were converted from Turkish Liras to US dollars and rounded.

RESULTS

Among 163 patients, AKI occurred in 25 (15.3%) patients, all within the first 48 postoperative hours. Three (1.8%) patients required RRT. Baseline SCr levels were restored within 4.84 ± 1.34 days on average (3-8 days). No patient required RRT after discharge. The mean hospital stay was 3 days (2-6 days) longer and the hospital charge was 2500 US$ higher for the patients with AKI. After multivariable adjustment, only lower estimated glomerular filtration rate levels (odds ratio 0.945, 95%confidence interval 0.92-0.96) emerged as an independent predictor for AKI.

CONCLUSION

The AKI represents a frequent complication after hip fracture surgery associated with longer hospital stay and higher treatment costs with increased morbidity. Our results show baseline renal function is an independent predictor of AKI.

Elderly men with renal dysfunction are most at risk for poor outcome after neck of femur fractures

BACKGROUND

both acute and chronic renal dysfunction (ARD and CRD) have been reported to influence outcomes after neck of femur fractures. We have examined the relationship between the length of stay, mortality and renal dysfunction using biomarkers. These included pre-operative (admission) serum concentrations of urea, creatinine and albumin, and estimated glomerular filtration rates (eGFR) derived from four- and six-variable Modification of Diet in Renal Disease (MDRD) study equations.

METHODS

complete outcomes data for 566 patients and the patterns of variations in the biomarkers were analysed using generalised linear models. Cox-proportional hazard analyses investigated the association between kidney function (as assessed by the above-mentioned biochemical data) and post-operative length of stay and mortality. All patients were stratified for CRD according to their eGFR.

RESULTS

serum urea and creatinine were significantly, positively correlated with age. After adjusting for age and sex, risk of mortality was positively related to six-variable eGFR and creatinine, and marginally so for urea. One-year mortality risk thus worsened with stages of CRD (1-4), increasing age and male gender. Risk of discharge from trauma ward, the length of stay in trauma ward and the overall length of stay were not related to urea and creatinine, but were negatively related to both four- and six-variable eGFR.

CONCLUSIONS

the study has identified elderly renal-impaired males as the subgroup of patients most at risk for poor survival. This subgroup may require a more targeted approach to the management of their fluid and electrolyte homoeostasis to help improve their outcomes.

Sernbo score predicts survival after intracapsular hip fracture in the elderly

INTRODUCTION

The Sernbo score uses four factors (age, social situation, mobility and mental state) to divide patients into a high-risk and a low-risk group. This study sought to assess the use of the Sernbo score in predicting mortality after an intracapsular hip fracture.

METHODS

A total of 259 patients with displaced intracapsular hip fractures were included in the study. Data from prospectively generated databases provided 22 descriptive variables for each patient. These included operative management, blood tests and co-mobidities. Multivariate analysis was used to identify significant predictors of mortality.

RESULTS

The mean patient age was 85 years and the mean follow-up duration was 1.5 years. The one-year survival rate was 92% (± 0.03) in the low-risk group and 65% (± 0.046) in the high-risk group. Four variables predicted mortality: Sernbo score >15 (p=0.0023), blood creatinine (p=0.0026), ASA (American Society of Anaesthesiologists) grade >3 (p=0.0038) and non-operative treatment (p=0.0377). Receiver operating characteristic curve analysis showed the Sernbo score as the only predictor of 30-day mortality (area under curve 0.71 [0.65-0.76]). The score had a sensitivity of 92% and a specificity of 51% for prediction of death at 30 days.

CONCLUSIONS

The Sernbo score identifies patients at high risk of death in the 30 days following injury. This very simple score could be used to direct extra early multidisciplinary input to high-risk patients on admission with an intracapsular hip fracture.

Analysis of kidney dysfunction in orthopaedic patients

Backround

This retrospective study was undertaken to determine the incidence of kidney dysfunction (KD) and to identify potential risk factors contributing to development of KD in orthopaedic population following an elective or emergency surgery.

Methods

A total of 1025 patients were admitted in our institution over a period of one year with various indications. Eight hundred and ninety-three patients (87.1%) had a surgical procedure. There were 42 (52.5%) male and 38 (47.5%) female with a mean age of 72 years (range: 47 to 87 years). We evaluated the following potential risk factors: age, comorbidities, shock, hypotension, heart failure, medications (antibiotics, NSAIDs, opiates), rhabdomyolysis, imaging contrast agents and pre-existing KD.

Results

The overall incidence of KD was 8.9%. Sixty-eight patients developed acute renal injury (AKI) and 12 patients developed acute on chronic kidney disease (CKD). In sixty-six (82.5%) patients renal function was reversed to initial preoperative status. Perioperative dehydration (p = 0.002), history of diabetes mellitus (p = 0.003), pre-existing KD (p = 0.004), perioperative shock (p = 0.021) and administration of non-steroid anti-inflammatory drugs (NSAIDs) (p = 0.028) or nephrotoxic antibiotics (p = 0.037) were statistically significantly correlated with the development of postoperative KD and failure to gain the preoperative renal function.

Conclusion

We conclude that every patient with risk factor for postoperative KD should be under closed evaluation and monitoring.

A national survey into perioperative anesthetic management of patients with a fractured neck of femur

Background

We made a survey among Finnish anesthesiologists concerning the current perioperative anesthetic practice of hip fracture patients for further development in patient care.

Methods

All members of the Finnish Society of Anesthesiologists with a known e-mail address (786) were invited to participate in an internet-based survey.

Results

The overall response rate was 55% (423 responses); 298 respondents participated in the care of hip fracture patients. Preoperative analgesia was mostly managed with oxycodone and paracetamol; every fifth respondent applied an epidural infusion. Most respondents (98%) employed a spinal block with or without an epidural catheter for intraoperative anesthesia. Midazolam, propofol and/or fentanyl were used for additional sedation. General anesthesia was used rarely. Postoperatively, paracetamol and non-steroidal anti-inflammatory drugs and occasionally peroral oxycodone, were prescribed in addition to epidural analgesia.

Conclusions

The survey suggests that the impact of more individualised analgesia regimens, both preoperatively and postoperatively, should be investigated in further studies.

Incidence and estimated annual cost of emergency laparotomy in England: is there a major funding shortfall?

Significant recent interest has focussed on improving outcomes after emergency laparotomy. This retrospective database analysis estimated the annual incidence and associated inpatient costs of emergency laparotomy in England. Demographic, process and outcome data were collected for all patients undergoing emergency laparotomy in Brighton for two calendar years (2009-2010). Cost analysis assumed £16 per minute theatre time, and £282 per day ward bed and £1382 per day critical care bed costs. National incidence was confirmed from Hospital Episode Statistics and Office of National Statistics mid-year population data. In total, 768 patients underwent 850 emergency laparotomies. The incidence of emergency laparotomy was estimated as ∼1:1100 population. Thirty-six percent (276 patients) were admitted for a median (IQR [range]) of 5 (3-11 [1-76]) days of critical care. Postoperative median (IQR [range]) length of stay was 13 (8-24 [1-176]) days. Our estimated annual inpatient cost of emergency laparotomy for Brighton was ∼£5 million, equivalent to ∼£13 000 per patient, and for England, an annual estimated cost of ∼£650 million. However, 'Payment by Results' reimbursement amounted to a mean (SD) hospital income of just £6905 (2639) per patient, a net financial loss of ∼£6100 per patient, equivalent to a reimbursement shortfall nationally of ∼£300 million. We also found that patients > 70 years (46%) had significantly higher 30-day postoperative mortality (18% vs 6%, p < 0.0001), significantly prolonged median (IQR [range]) length of stay (15 (10-26 [1-123]) days vs 12 (7-22 [1-176]) days, p < 0.001) and incurred higher costs (median (IQR [range]) £9667 (6620-15 732 [1920-103 624]) vs £7467 (4975-14 251 [1178-118 060]), p < 0.001). Emergency laparotomy is a common procedure associated with considerable cost, particularly among elderly patients. A National Emergency Laparotomy Database will help provide an evidence base on which to improve clinical outcome and cost efficiency.

Management of proximal femoral fractures 2011: Association of Anaesthetists of Great Britain and Ireland

There should be protocol-driven, fast-track admission of patients with hip fractures through the emergency department. Patients with hip fractures require multidisciplinary care, led by orthogeriatricians. Surgery is the best analgesic for hip fractures. Surgical repair of hip fractures should occur within 48 hours of hospital admission. Surgery and anaesthesia must be undertaken by appropriately experienced surgeons and anaesthetists. There must be high-quality communication between clinicians and allied health professionals. Early mobilisation is a key part of the management of patients with hip fractures. Pre-operative management should include consideration of planning for discharge from hospital. Measures should be taken to prevent secondary falls. 10. Continuous audit and targeted research is required in order to inform and improve the management of patients with hip fracture.