Racial differences in ischemic complications of pedicled versus free abdominal flaps for breast reconstruction

Inexperienced Evaluator Identification of Hand Ischemia Via Video Processed with Pigment-Enhancing Technology

Purpose

Eulerian video magnification (EVM)+waveform is a novel video processing software that enhances visualization of tissue perfusion and has been shown to improve hand surgeon identification of ischemia via video alone. The purpose of this study is to determine whether EVM+waveform technology will support improved accuracy in identifying hand ischemia for less experienced persons, regardless of the evaluator's health care experience or the melanin content of the hand in the video.

Methods

Healthy volunteers were recruited for us to record videos of their hands both perfused and under tourniquet-induced ischemia. Videos were processed with EVM+waveform and inserted into a 26-question survey. There were two types of questions presented in each survey. One format showed a video processed with EVM+waveform, and the respondent was asked if the hand was ischemic, perfused, or if they were unsure. The second format presented two side-by-side videos, one ischemic and one perfused. Both were processed with EVM+waveform, and the respondent had to choose which was ischemic. Respondents included both medical and non-medical professionals none of whom had experience with hand surgery.

Results

A total of 64 survey responses were recorded. The EVM+waveform technology significantly improved accuracy in determining ischemia regardless of the respondent's health care experience. Respondents were divided into medical doctorate (MD; n = 15) and non-MD (n = 49) groups. Both groups demonstrated significant improvement in determining ischemia when using EVM+waveform. Within the non-MD cohort, accuracy percentages significantly improved across Fitzpatrick types IV, V, and VI. Within the MD cohort, accuracy percentages significantly improved across Fitzpatrick types III, V, and VI.

Conclusions

These findings further establish EVM+waveform as an effective modality for identifying ischemia via video alone, as it enhanced performance for inexperienced evaluators. EVM+waveform is effective for assessing various skin types, especially those with higher skin melanin content.

Type of study/level of evidence

Diagnostic, IV.

Assessing Hand Perfusion With Eulerian Video Magnification and Waveform Extraction

PURPOSE

Timely and accurate triage of upper extremity injuries is critical, but current perfusion monitoring technologies have shortcomings. These limitations are especially pronounced in patients with darker skin tones. This pilot study evaluates a Eulerian Video Magnification (EVM) algorithm combined with color channel waveform extraction to enable video-based measurement of hand and finger perfusion.

METHODS

Videos of 10 volunteer study participants with Fitzpatrick skin types III-VI were taken in a controlled environment during normal perfusion and tourniquet-induced ischemia. Videos were EVM processed, and red/green/blue color channel characteristics were extracted to produce waveforms. These videos were assessed by surgeons with a range of expertise in hand injuries. The videos were randomized and presented in 1 of 3 ways: unprocessed, EVM processed, and EVM with waveform output (EVM+waveform). Survey respondents indicated whether the video showed an ischemic or perfused hand or if they were unable to tell. We used group comparisons to evaluate response accuracy across video types, skin tones, and respondent groups.

RESULTS

Of the 51 providers to whom the surveys were sent, 25 (49%) completed them. Using the Pearson χ2 test, the frequencies of correct responses were significantly higher in the EVM+waveform category than in the unprocessed or EVM videos. Additionally, the agreement was higher among responses to the EVM+waveform questions than among responses to the unprocessed or EVM processed. The accuracy and agreement from the EVM+waveform group were consistent across all skin pigmentations evaluated.

CONCLUSIONS

Video-based EVM processing combined with waveform extraction from color channels improved the surgeon's ability to identify tourniquet-induced finger ischemia via video across all skin types tested.

CLINICAL RELEVANCE

Eulerian Video Magnification with waveform extraction improved the assessment of perfusion in the distal upper extremity and has potential future applications, including triage, postsurgery vascular assessment, and telemedicine.

Racial Disparities Following Reconstructive Flap Procedures

BACKGROUND

Prior reports have highlighted disparities in healthcare access, environmental conditions, and food insecurity between Black and White populations in the United States. However, limited studies have explored racial disparities in postoperative complications, particularly reconstructive flap surgeries.

METHODS

Cases of flap reconstruction based on named vascular pedicles were identified in the American College of Surgeons National Surgical Quality Improvement Program database and grouped into 3 time periods: 2005 to 2009, 2010 to 2014, and 2015 to 2019. Logistic regression was used to compare rates of postoperative complications between White and Black patients within each time period while controlling for comorbidities. Data for flap failure was only available from 2005 to 2010.

RESULTS

A total of 56,116 patients were included in the study, and 6293 (11.2%) were Black. Black patients were significantly younger than White patients and had increased rates of hypertension, smoking, and diabetes across all years ( P <0.01). Black patients had significantly higher rates of sepsis compared to White patients in all time periods. From 2005 to 2009, Black patients had a significantly higher incidence of flap failure (aOR=2.58, P <0.01), return to the operating room (aOR=1.53, P =0.01), and having any complication (aOR=1.48, P <0.01). From 2010 to 2019, White patients had a higher incidence of superficial surgical site infection.

CONCLUSIONS

Surgical complication rates following flap reconstruction based on a named vascular pedicle were higher for Black patients. Limited data on this topic currently exists, indicating that additional research on the drivers of racial disparities is warranted to improve plastic surgery outcomes in Black patients.

The correlation of flap blood glucose with fat necrosis of free abdominal flap for unilateral breast reconstruction

BACKGROUND

Flap blood glucose (FBG) measurement is proposed as a monitoring technique. A cause of long-lasting fever could be derived from fat necrosis. If the findings of low FBG correlated with fat necrosis, it could predict the poor cosmetic result and a source of fever. However, this correlation remained unsolved. The purpose of this study was to clarify this correlation in breast reconstruction.

METHODS

In the 180 unilateral breast cancer patients (mean age = 49.8 years) performed free abdominal flap, we retrospectively compared the group where fat necrosis occurred with the group where it did not occur (45 patients with fat necrosis vs. 135 patients without). We compared the average of FBG in each postoperative day.

RESULTS

The average FBG was significantly lower in patients with fat necrosis in the second postoperative day (115.3 ± 27.3 vs. 126.3 ± 13.7 mg/dl, p = .026) and the third postoperative day (111.1 ± 22.1 vs. 118.8 ± 13.8 mg/dl, p = .036). Mean BMI and inserted total flap weight were significantly higher in patients with the fat necrosis group (24.8 vs. 22.9 kg/m² , p = .005) (617 vs. 478 g, p = .006). The multivariate analysis revealed early FBG (OR = 0.96, p = .0002) and laterality (right side) (OR = 0.46, p = .043) were independently significant predictors. There were no significant between-group differences regarding other factors (age, systemic blood glucose, comorbidities and operative details).

CONCLUSIONS

The possibility of fat necrosis was high for patients with low FBG in the early postoperative day.

Morbidity of the Donor Site and Complication Rates of Breast Reconstruction with Autologous Abdominal Flaps: A Systematic Review and Meta-Analysis

Background. Numerous studies have evaluated the use of autologous abdominal tissue for breast reconstruction; nevertheless, complications and donor site morbidity rates vary significantly. The study aims to compare the literature regarding morbidity of the donor site and complication rates of breast reconstruction with autologous abdominal flaps. Methods. The databases of MEDLINE, EBSCO, Scopus, Wiley Library, and Web of Sciences were searched for studies that compared different flaps in terms of complications and donor site morbidity. The procedures studied included pedicled transverse rectus abdominis myocutaneous flap (pTRAM), free TRAM (fTRAM), deep inferior epigastric perforator (DIEP), and superficial inferior epigastric artery perforator (SIEA) flaps. A total of 34 studies were included. Of these, 28 were retrospective studies and 9 were prospective cohort studies. Results. When compared to DIEP, fTRAM flaps were found to have a decreased incidence of flap fat necrosis, hematoma, and total thrombotic events, yet a higher risk of donor site hernia/bulging. pTRAM flaps were also associated with an increased risk of hernia/bulging at the donor site, as well as wound infection, yet flap hematoma was less common. On the other hand, SIEA flaps showed the lowest risk of donor site hernia/bulging while still having a high risk of wound infection. Conclusion. fTRAM procedures comparatively had the least complications. However, regarding flap choice, patients would benefit most from a case-by-case analysis, taking into consideration individual risk factors and preferences.

Persistent Disparities in Postmastectomy Breast Reconstruction and Strategies for Mitigation

For many women, breast reconstruction is an essential component of the breast cancer care continuum after mastectomy. Despite postmastectomy breast reconstruction now being a standard of care, numerous studies over the past decade have documented persistent racial disparities in breast reconstruction rates, physician referral patterns, and patient knowledge of their reconstructive options. These disparities have disproportionately impacted women of color-most specifically, African American women. Recent data have revealed racial differences in patient comorbidities, informed decision-making satisfaction, and clinical outcomes after breast reconstruction. Explicitly, African American women have significantly more risk factors for complications and less baseline knowledge regarding reconstructive options than white women. With a recent heightened attention focused on social determinants of health, studies designed to improve these racial differences have demonstrated promising results through educational outreach to underserved communities, implementation of tailored legislation promoting inclusion, diversity, and equity, and encouragement of additional recruitment of ethnically underrepresented-in-medicine surgeons. This study uses a targeted review of the literature to provide a summary of racial disparities in breast reconstruction for African American women, with our perspective on opportunities for improvement.

Racial Disparities in Outcomes of Reconstructive Breast Surgery: An Analysis of 51,362 Patients from the ACS-NSQIP

BACKGROUND

 In various surgical specialties, racial disparities in postoperative complications are widely reported. It is assumed that the effect of race can also be found in plastic surgical outcomes, although this remains largely undefined in literature. This study aims to provide data on the impact of race on outcomes of reconstructive breast surgery.

METHODS

 Data were collected using the NSQIP (National Surgical Quality Improvement Program) database (2008-2016). Outcomes of the reconstructive breast surgery of White patients were compared with those of African American, Asian, or other races. Logistic regression was performed to control for variations between all groups. Analysis of racial disparities was further sub-stratified according to four different types of breast reconstruction: delayed or immediate autologous, and delayed or immediate prosthesis-based reconstruction.

RESULTS

 In total, this study included 51,362 patients of which 43,864 were Caucasian, 5,135 African American, 2,057 Asian, and 332 of other races. When compared with White patients, patients of African American race had larger body mass indices (31.3 ± 7.0 vs. 27.6 ± 6.3, p-value < 0.001) in addition to higher rates of diabetes (12.3 vs 4.6%, p-value < 0.001) and hypertension (44.7 vs. 23.4%, p-value < 0.001). Both multivariate analysis and the sub-stratified analysis of different types of reconstruction showed no differences in overall complication rate.

CONCLUSION

 Among the four types of reconstructive procedures, differences in surgical outcomes do not appear to be based on race and therefore seem to be less evident in reconstructive breast surgery compared with the current literature within other surgical specialties.

Disparities in Postmastectomy Breast Reconstruction: A Systematic Review of the Literature and Modified Framework for Advancing Research Toward Intervention

BACKGROUND

As the United States' population diversifies, eliminating disparities in health and healthcare has become increasingly important across all disciplines of medicine, including plastic and reconstructive surgery. This is evidenced by the growing body of literature in recent years focusing on disparities in postmastectomy breast reconstruction. No study to date has evaluated whether this research is progressing appropriately to promote tangible evidence-based interventions to reduce these disparities.

METHODS

A systematic literature review in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines was performed to identify studies focusing on disparities in postmastectomy breast reconstruction. A previously established public health framework for advancing health disparities research was used to inform analysis of the quality and progression of the included studies. This triphasic framework categorizes disparities research as follows: detecting (identifies and measures disparities in vulnerable populations), understanding (establishes determinants of disparities), or reducing (proposes and evaluates interventions for eliminating disparities).

RESULTS

Ninety-five studies were identified between 1979 and 2016, with 61 (64.2%) published after 2010. The majority of studies (51.6%) were retrospective cohort or case-control studies (American Society of Plastic Surgery level III evidence). Fifty-eight (63.7%), 31 (34.1%), and 2 (2.2%) studies provided detecting-, understanding- and reducing-phase disparities research, respectively. Non-plastic and reconstructive surgery journals accounted for 70.5% of all articles and for most higher phase research articles, publishing 83.9% and 100% of second and third phase studies, respectively. Disparity categories investigated included race/ethnicity, age, income, insurance status/type, geography, and education level, with race/ethnicity being the most common (73.7%). The most commonly measured outcome was percent of subpopulation receiving reconstruction (63, 66.3%), followed by reconstruction type (14, 16.7%). Patient-, provider-, system-, and research-level factors were all identified as potential targets for interventions to reduce disparities.

CONCLUSIONS

Despite a recent increase in literature focusing on postmastectomy breast reconstruction disparities, the majority focuses on identifying vulnerable populations with inadequate progression to second (understanding) and third (reducing) phases. Increasing research funding, availability of language-concordant and culturally concordant educational materials, and advocacy and sociopolitical awareness within the plastic surgery community is necessary to advance research on postmastectomy breast reconstruction and, ultimately, eliminate it.

Intraoperative Tissue Perfusion Measurement by Laser Speckle Imaging: A Potential Aid for Reducing Postoperative Complications in Free Flap Breast Reconstruction

Adequate tissue perfusion is essential to minimize postoperative complications following microsurgery. Intraoperative knowledge of tissue perfusion could aid surgical decision-making and result in reduced complications. Laser speckle imaging is a new, noninvasive technique for mapping tissue perfusion. This article discusses the feasibility of using laser speckle imaging during free flap breast reconstruction and its potential to identify areas of inadequate perfusion, thus reducing surgical complications. Adult patients scheduled to undergo free flap breast reconstruction were recruited into the study. Laser speckle images were obtained from the abdominal and breast areas at different stages intraoperatively. Zonal perfusion was compared with the Holm classification and clinical observations. Twenty patients scheduled to undergo free flap breast reconstruction were recruited (23 reconstructed breasts) (mean age, 50 years; range, 32 to 68 years). Flap zonal perfusion was 238 (187 to 313), 222 (120 to 265), 206 (120 to 265), and 125 (102 to 220) perfusion units for zones I, II, III, and IV, respectively (analysis of variance, p < 0.0001). Zonal area with perfusion below an arbitrary perfusion threshold were 20 (0.3 to 75), 41 (3 to 99), 49 (9 to 97), and 99 (25 to 100) percent, respectively (analysis of variance, p < 0.0001). One example is presented to illustrate potential intraoperative uses for laser speckle imaging. This study shows that laser speckle imaging is a feasible, noninvasive technique for intraoperative mapping of tissue perfusion during free flap breast reconstruction. Zonal tissue perfusion was reduced across the Holm classification. Observations indicated the potential for laser speckle imaging to provide additional information to augment surgical decision-making by detection of inadequate tissue perfusion. This highlights the opportunity for surgeons to consider additional aids for intraoperative tissue perfusion assessment to help reduce perfusion-related complications. CLINICAL QUESTION/LEVEL OF EVIDENCE:: Diagnostic, IV.

Intraoperative Indocyanine Green Angiography for Fat Necrosis Reduction in the Deep Inferior Epigastric Perforator (DIEP) Flap

BACKGROUND

Fat necrosis is a frequent complication (up to 62.5%) of microsurgical breast reconstruction using the deep inferior epigastric perforator (DIEP) flap. This could have important clinical and psychological repercussions, deteriorating the results and increasing reconstruction costs.

OBJECTIVES

The aim of this study was to demonstrate the intraoperative use of indocyanine green angiography (ICGA) to reduce fat necrosis in DIEP flap.

METHODS

Sixty-one patients who underwent unilateral DIEP flap procedures for breast reconstruction after oncological mastectomy were included (24 cases with intraoperative use of ICGA during surgery, 37 cases in the control group). The follow-up period was 1 year after surgery. The association between the use of ICGA and the incidence of fat necrosis in the first postoperative year, differences in fat necrosis grade (I-V), differences in fat necrosis requiring reoperation, quality of life, and patient satisfaction were analyzed.

RESULTS

The incidence of fat necrosis was reduced from 59.5% (control group) to 29% (ICG-group) (P = 0.021) (relative risk = 0.49 [95% CI, 0.25-0.97]). The major difference was in grade II (27% vs 2.7%, P = 0.038). The number of second surgeries for fat necrosis treatment was also reduced (45.9% vs 20.8%, P = 0.046). The ICG group had higher scores on the BREAST-Q.

CONCLUSIONS

Intraoperative ICGA is a useful technique for reconstructive microsurgery that might improve patient satisfaction and reduce the incidence of fat necrosis by half as well as reduce its grade, especially in small fat necrosis cases; consequently, ICGA could reduce the number of secondary surgeries for treatment of fat necrosis.

LEVEL OF EVIDENCE: 4

The Effect of Skin Pigmentation on Determination of Limb Ischemia

PURPOSE

Timely identification of tissue ischemia is critical, both in the traumatized limb and following free tissue transfer. The purpose of this study was to determine if skin pigmentation affects the ability to detect limb ischemia.

METHODS

We conducted a study of healthy controls exposed to limb ischemia. The subjects were classified based on skin pigmentation using a defined skin type assessment tool, a visual color scale, and self-description of race. Participants were randomized by limb and tourniquet status; surgeons were blinded to both. Ischemia was induced by tourniquet insufflations, and board-certified orthopedic and plastic surgeons who had completed an accredited hand surgery fellowship conducted physical examinations. The surgeons monitored the forearms at 2, 6, and 10 minutes based on appearance of ischemia, capillary refill, and color in 3 locations on the limbs (posterior interosseous artery flap skin territory, radial forearm flap skin territory, and the digits).

RESULTS

We found a significant decrease in the ability to detect ischemia in participants with increased skin pigmentation, as documented by all metrics, when evaluating the posterior interosseous artery and radial forearm flap skin territories at all time points. For example, when monitoring the posterior interosseous artery flap with the tourniquet insufflated at time 10 minutes, 92.9% of Caucasians were correctly identified as being ischemic whereas only 23.3% of African Americans were correctly identified.

CONCLUSIONS

Skin pigmentation significantly affects the identification of an ischemic limb/skin flaps on physical examination. Whereas the standard treatment for monitoring of free tissue transfer is clinical examination, that may not be sufficient for patients with increased skin pigmentation. Surgeons should exercise particular vigilance during physical examination of a potentially ischemic limb/skin flaps with greater skin pigmentation.

TYPE OF STUDY/LEVEL OF EVIDENCE

Diagnostic II.

Meta-analysis of flap perfusion and donor site complications for breast reconstruction using pedicled versus free TRAM and DIEP flaps

OBJECTIVES

The transverse rectus abdominis musculocutaneous (TRAM) flap is an important option for breast reconstruction. Several studies have recently evaluated whether a greater number of complications result from the use of pedicled TRAM (pTRAM) flaps versus either free TRAM (fTRAM) flaps or deep inferior epigastric artery perforator (DIEP) flaps. To clarify the evidence regarding this issue, we performed an objective meta-analysis of published studies.

MATERIALS AND METHODS

A literature search of articles published between January 1, 1990, to January 1, 2017 was performed using the PubMed, EMBASE, Scopus, and Cochrane databases. Heterogeneity was statistically analyzed, and fixed effects and random effects models were used as appropriate.

RESULTS

Eleven articles comparing pedicled TRAM (pTRAM) flaps with either free TRAM (fTRAM) or DIEP flaps were included. The articles evaluated a total of 3968 flaps, including 1891 pTRAM flaps, 866 fTRAM flaps, and 1211 DIEP flaps. Patients with fTRAM flaps had a significantly lower risk of fat necrosis and partial flap necrosis than those with pTRAM flaps. No difference was observed in total flap necrosis and hernia or bulge between fTRAM and pTRAM flaps. No difference was noted in flap complications between DIEP and pTRAM flaps except for hernia or bulge..

CONCLUSION

Although pTRAM flaps are being replaced by fTRAM and DIEP flaps, which exhibit fewer complications related to flap ischemia and donor site morbidity, it was unclear from the literature which flap type was most beneficial regarding flap vascularity and donor site morbidity. Hence, surgeons should choose the appropriate option based on their preferences and on patient factors..