Association of Overlapping Surgery With Perioperative Outcomes

Overlapping otolaryngologic surgery: Safety and efficacy

BACKGROUND

Surgical procedures scheduled staggered between two operating rooms increase efficiency by eliminating turnover time. However, the practice might increase the surgeon's fatigue. Overlapping surgery has been assumed to be safe because no critical portions of procedures are performed simultaneously in two rooms, but there is little evidence in the literature to support that assumption for otolaryngologic surgery, and there is no evidence comparing non-overlapping and overlapping surgical outcomes for a single surgeon with all confounding factors controlled.

METHODS

Retrospective cohort study that included a consecutive sample of adult subjects who underwent otolaryngologic laryngeal or otologic surgery between June 2013 and March 2016. All procedures were performed by the same surgical team and surgeon who had block time with 2-rooms every other week and 1-room on alternate weeks. The incidence of surgical complications was assessed in the perioperative period. Duration of surgery and time-in-room also were evaluated, as were surgical outcomes.

RESULTS

A total of 496 surgeries were assigned to either overlapping-surgery (n = 346) or non-overlapping-surgery (n = 150) cohorts. Overlapping-surgery was a significant predictor for increased time-in-room on multivariate analysis but was not a significant predictor for surgery duration. Rate of complications, hospital readmission, emergency department visit, reoperation, mortality, and patient satisfaction did not differ significantly between cohorts.

CONCLUSIONS

Overlapping surgery does not hinder patient safety or functional outcomes in patients undergoing otolaryngologic operations such as voice or ear surgery.

Anesthesia Techniques for Vitreoretinal Surgery in the United States: A Report from the Multicenter Perioperative Outcomes Group Research Consortium

PURPOSE

To explore the patterns of anesthesia use and their determinants during vitreoretinal (VR) surgeries in academic and community hospitals across the US, using data from the Multicenter Perioperative Outcomes Group (MPOG).

DESIGN

A retrospective, multicenter, cohort study.

METHODS

We queried the MPOG database of 107,066 patients undergoing VR surgeries. Patients (≥18 years) undergoing VR surgery with monitored anesthesia care (MAC) or general anesthesia (GA) from January 1, 2015 to December 31, 2021 were included. Patient-level, case-based, and institutional-level covariates were collected. We performed multivariable mixed-effects models to determine predictors of anesthesia type use. The primary outcome was the type of anesthesia (MAC or GA) used during VR surgeries. As a secondary outcome, MAC cases were further classified based on the additional use of sedation into MAC with or without sedation.

RESULTS

We found that 67.45% of VR surgery cases received MAC, and 73.63% of institutions administered MAC to more than half of cases. Random effect modeling revealed that 47.76% of the variation in MAC use was attributed to institutions. A trend toward increased use of MAC with increasing age was observed. Patients diagnosed with chronic pulmonary disease, liver disease, or a history of drug abuse were less likely to receive MAC. Conversely, we found that patients with reported alcohol abuse disorder, diabetes with complications, and those with American Society of Anesthesiologists (ASA) physical status of 4 (vs. 1, 2, or 3) were more likely to use MAC. Compared to non-complex VR surgeries, there was a notably decreased likelihood of MAC use in complex PPV (P = .004), PPV + scleral buckle (SB) for retinal detachment (P < .0001), and primary SB surgery (P < .0001).

CONCLUSIONS

Approximately 2/3 of VR anesthesia is under MAC, but GA is still preferred for SBs, complex vitrectomy, and younger patients. We show that large interinstitutional variation for using MAC in practice exists.

Differences between patients in whom physicians agree versus disagree about the preoperative diagnosis of heart failure

STUDY OBJECTIVE

To quantify preoperative heart failure (HF) diagnostic agreement and identify characteristics of patients in whom physicians agreed versus disagreed about the diagnosis.

DESIGN

Observational cohort study.

SETTING

Patients undergoing major non-cardiac surgery at an academic center between 2015 and 2019.

PATIENTS

40,659 patients undergoing major non-cardiac surgery, among which a stratified subsample of 1018 patients with and without documented HF was reviewed.

INTERVENTIONS

Via a panel of physicians frequently managing patients with HF (cardiologists, cardiac anesthesiologists, intensivists), detailed chart reviews were performed (two per patient; median review time 32 min per reviewer per patient) to render adjudicated HF diagnoses.

MEASUREMENTS

Adjudicated diagnostic agreement measures (percent agreement, Krippendorf's alpha) and univariate comparisons (standardized differences) between patients in whom physicians agreed versus disagreed about the preoperative HF diagnosis.

MAIN RESULTS

Among patients with documented HF, physicians agreed about the diagnosis in 80.0% of cases (consensus positive), disagreed in 13.8% (disagreement), and refuted the diagnosis in 6.3% (consensus negative). Conversely, among patients without documented HF, physicians agreed about the diagnosis in 88.0% (consensus negative), disagreed in 8.4% (disagreement), and refuted the diagnosis in 3.6% (consensus positive). The estimated agreement for the 40,659 cases was 91.1% (95% CI 88.3%-93.9%); Krippendorff's alpha was 0.77 (0.75-0.80). Compared to patients in whom physicians agreed about a HF diagnosis, patients in whom physicians disagreed exhibited fewer guideline-defined HF diagnostic criteria.

CONCLUSIONS

Physicians usually agree about HF diagnoses adjudicated via chart review, although disagreement is not uncommon and may be partly explained by heterogeneous clinical presentations. Our findings inform preoperative screening processes by identifying patients whose characteristics contribute to physician disagreement via chart review. Clinical Trial Number / Registry URL: Not applicable.

Machine Learning for the Prediction of Procedural Case Durations Developed Using a Large Multicenter Database: Algorithm Development and Validation Study

BACKGROUND

Accurate projections of procedural case durations are complex but critical to the planning of perioperative staffing, operating room resources, and patient communication. Nonlinear prediction models using machine learning methods may provide opportunities for hospitals to improve upon current estimates of procedure duration.

OBJECTIVE

The aim of this study was to determine whether a machine learning algorithm scalable across multiple centers could make estimations of case duration within a tolerance limit because there are substantial resources required for operating room functioning that relate to case duration.

METHODS

Deep learning, gradient boosting, and ensemble machine learning models were generated using perioperative data available at 3 distinct time points: the time of scheduling, the time of patient arrival to the operating or procedure room (primary model), and the time of surgical incision or procedure start. The primary outcome was procedure duration, defined by the time between the arrival and the departure of the patient from the procedure room. Model performance was assessed by mean absolute error (MAE), the proportion of predictions falling within 20% of the actual duration, and other standard metrics. Performance was compared with a baseline method of historical means within a linear regression model. Model features driving predictions were assessed using Shapley additive explanations values and permutation feature importance.

RESULTS

A total of 1,177,893 procedures from 13 academic and private hospitals between 2016 and 2019 were used. Across all procedures, the median procedure duration was 94 (IQR 50-167) minutes. In estimating the procedure duration, the gradient boosting machine was the best-performing model, demonstrating an MAE of 34 (SD 47) minutes, with 46% of the predictions falling within 20% of the actual duration in the test data set. This represented a statistically and clinically significant improvement in predictions compared with a baseline linear regression model (MAE 43 min; P<.001; 39% of the predictions falling within 20% of the actual duration). The most important features in model training were historical procedure duration by surgeon, the word "free" within the procedure text, and the time of day.

CONCLUSIONS

Nonlinear models using machine learning techniques may be used to generate high-performing, automatable, explainable, and scalable prediction models for procedure duration.

Alternatives to Hospitalization: Adding the Patient Voice to Advanced Heart Failure Management

Advanced heart failure (HF) is associated with the extensive use of acute care services, especially at the end of life, often in stark contrast to the wishes of most HF patients to remain at home for as long as possible. The current Canadian model of hospital-centric care is not only inconsistent with patient goals, but also unsustainable in the setting of the current hospital-bed availability crisis across the country. Given this context, we present a narrative to discuss factors necessary for the avoidance of hospitalization in advanced HF patients. First, patients eligible for alternatives to hospitalization should be identified through comprehensive, values-based, goals-of-care discussions, including involvement of both patients and caregivers, and assessment of caregiver burnout. Second, we present pharmaceutical interventions that have shown promise in reducing HF hospitalizations. Such interventions include strategies to combat diuretic resistance, as well as nondiuretic treatments of dyspnea, and the continuation of guideline-directed medical therapies. Finally, to successfully care for advanced HF patients at home, care models, such as transitional care, telehealth, collaborative home-based palliative care programs, and home hospitals, must be robust. Care must be individualized and coordinated through an integrated care model, such as the spoke-hub-and-node model. Although barriers exist to the implementation of these models and strategies, they should not prevent clinicians from striving to provide individualized person-centred care. Doing so will not only alleviate strain on the healthcare system, but also prioritize patient goals, which is of the utmost importance.

Overlapping Surgeries From the Patient's Perspective

INTRODUCTION

Overlapping surgery (OS) occurs when a single surgeon is concurrently caring for patients in multiple operating rooms (OR) but is present for all critical portions of each surgery. Although this is common practice, most studies have found public disapproval of OS. This study aims to better understand attitudes toward OS of patients who gave informed consent for OS.

METHODS

Participant interviews covered topics including trust, OR personnel roles, and attitudes toward OS. Four representative transcripts were distributed among researchers for independent code identification. These were aggregated into a codebook, applied by two coders. Iterative and emergent thematic analyses were done.

RESULTS

Twelve participants were interviewed to reach thematic saturation. Three themes shaped how participants felt about OS: trust in their surgeon, worries about OS, and understanding of OR personnel roles. Factors contributing to trust included personal research and the surgeon's experience. Frequently cited concerns were unpredictability of complications during operations and the surgeon's divided attention. Two participants inaccurately understood personnel roles, believing the surgeon did most or all the hands-on work while trainees were observers. Most participants felt a high or neutral level of comfort toward OS and indicated trust as the reason.

CONCLUSIONS

In contrast to prior research, this study found that most participants had a neutral or positive view of OS. This suggests that a trusting relationship with their surgeon and informed consent are important factors in increasing comfort for OS. Participants who misunderstood OR roles felt less comfortable toward OS. This highlights an opportunity for patient education on trainee roles.

Impact of the Percentage of Overlapping Surgery on Patient Outcomes: A Retrospective Cohort Study of 87,000 Surgical Cases

OBJECTIVES

The primary objective of this study was to analyze the relationship of percentage of surgical overlap with patient outcomes to determine if a detrimental level of overlap exists.

BACKGROUND

Overlapping surgery is defined as 1 attending physician supervising 2 or more operative cases simultaneously, without the critical portions of the cases occurring concurrently. To date, no study has examined the relationship of percent overlap, or the percentage of 1 case that is spent overlapping with another, to outcomes, efficiency, safety, and complications.

METHODS

This study is a retrospective cohort study conducted at a large tertiary referral center. The primary outcomes of interest included operative duration, in-hospital mortality, 30-day readmission, and patient safety indicators (PSIs). The Cochran-Armitage test for trend was used to evaluate the outcomes of interest. P values of ≤0.05 were considered statistically significant.

RESULTS

A total of 87,426 cases were included in this study. There were 62,332 cases without overlap (Group 0), 10,514 cases with 1% to 25% overlap (Group 1), 5303 cases with 26% to 50% overlap (Group 2), 4296 cases with 51% to 75% overlap (Group 3), and 4981 cases with >75% overlap (Group 4). In-hospital mortality decreased as overlap increased ( Ptrend <0.0001). Operative time increased with increasing overlap ( Ptrend <0.0001) while readmission rates showed no statistical significance between groups ( Ptrend =0.5078). Rates of PSIs were lower for Groups 1, 2, and 3 (1.69%, 2.01%, and 2.08%) when compared to Group 0 (2.24%). Group 4 had the highest rate of PSIs at 2.35% ( P =0.0086).

CONCLUSION

Overlapping surgery was shown to have reduced in-hospital mortality and similar PSI and readmission rates when compared to nonoverlapping cases. Operative time was shown to increase in overlapping surgeries when compared to nonoverlapping surgeries. The results from this study indicate that the percentage of surgical overlap does not detrimentally affect most patient outcomes, especially with overlap of <75%.

Do overlapping neurosurgical procedures affect patient outcomes? A systematic review and meta-analysis

Overlapping surgery (OS) is a common practice in neurosurgery that has recently come under scrutiny. This study includes a systematic review and meta-analysis on articles evaluating the effects of OS on patient outcomes. PubMed and Scopus were searched for studies that analyzed outcome differences between overlapping and non-overlapping neurosurgical procedures. Study characteristics were extracted, and random-effects meta-analyses were performed to analyze the primary outcome (mortality) and secondary outcomes (complications, 30-day readmissions, 30-day operating room returns, home discharge, blood loss, and length of stay). Mantel-Haenszel tests were completed for binary outcomes, whereas the inverse variance tests were conducted for continuous outcomes. Heterogeneity was measured using the I² and X² tests. The Egger's test was conducted to evaluate publication bias. Eight of 61 non-duplicate studies were included. Overall, 21,249 patients underwent non-OS (10,504 female) and 15,863 patients underwent OS (8393 female). OS was associated with decreased mortality (p = 0.002), 30-day returns to OR (p < 0.001), and blood loss (p < 0.001) along with increased home discharges (p < 0.001). High heterogeneity was observed for home discharge (p = 0.002) and length of stay (p < 0.001). No publication bias was observed. OS was not associated with worse patient outcomes compared to non-OS. However, considering multiple sources of limitation in the methodology of the included studies (such as limited number of studies, reports originating from mostly high-volume academic centers, discrepancy in the definition of "critical portion(s)" of the surgery across studies, and selection bias), extra caution is advised in interpretation of our results and further focused studies are warranted.

Postoperative Acute Kidney Injury by Age and Sex: A Retrospective Cohort Association Study

BACKGROUND

Acute kidney injury (AKI) after noncardiac surgery is common and has substantial health impact. Preclinical and clinical studies examining the influence of sex on AKI have yielded conflicting results, although they typically do not account for age-related changes. The objective of the study was to determine the association of age and sex groups on postoperative AKI. The authors hypothesized that younger females would display lower risk of postoperative AKI than males of similar age, and the protection would be lost in older females.

METHODS

This was a multicenter retrospective cohort study across 46 institutions between 2013 and 2019. Participants included adult inpatients without pre-existing end-stage kidney disease undergoing index major noncardiac, nonkidney/urologic surgeries. The authors' primary exposure was age and sex groups defined as females 50 yr or younger, females older than 50 yr, males 50 yr or younger, and males older than 50 yr. The authors' primary outcome was development of AKI by Kidney Disease-Improving Global Outcomes serum creatinine criteria. Exploratory analyses included associations of ascending age groups and hormone replacement therapy home medications with postoperative AKI.

RESULTS

Among 390,382 patients, 25,809 (6.6%) developed postoperative AKI (females 50 yr or younger: 2,190 of 58,585 [3.7%]; females older than 50 yr: 9,320 of 14,4047 [6.5%]; males 50 yr or younger: 3,289 of 55,503 [5.9%]; males older than 50 yr: 11,010 of 132,447 [8.3%]). When adjusted for AKI risk factors, compared to females younger than 50 yr (odds ratio, 1), the odds of AKI were higher in females older than 50 yr (odds ratio, 1.51; 95% CI, 1.43 to 1.59), males younger than 50 yr (odds ratio, 1.90; 95% CI, 1.79 to 2.01), and males older than 50 yr (odds ratio, 2.06; 95% CI, 1.96 to 2.17).

CONCLUSIONS

Younger females display a lower odds of postoperative AKI that gradually increases with age. These results suggest that age-related changes in women should be further studied as modifiers of postoperative AKI risk after noncardiac surgery.

EDITOR’S PERSPECTIVE

Overlapping Surgery-In DeBakey's Shadow

This Viewpoint discusses the future of the practice of overlapping surgeries.

Preoperative clinical diagnostic accuracy of heart failure among patients undergoing major noncardiac surgery: a single-centre prospective observational analysis

Background

Reliable diagnosis of heart failure during preoperative evaluation is important for perioperative management and long-term care. We aimed to quantify preoperative heart failure diagnostic accuracy and explore characteristics of patients with heart failure misdiagnoses.

Methods

We performed an observational cohort study of adults undergoing major noncardiac surgery at an academic hospital between 2015 and 2019. A preoperative clinical diagnosis of heart failure was defined using keywords from the history and clinical examination or administrative documentation. Across stratified subsamples of cases with and without clinically diagnosed heart failure, health records were intensively reviewed by an expert panel to develop an adjudicated heart failure reference standard using diagnostic criteria congruent with consensus guidelines. We calculated agreement among experts, and analysed performance of clinically diagnosed heart failure compared with the adjudicated reference standard.

Results

Across 40 555 major noncardiac procedures, a stratified subsample of 511 patients was reviewed by the expert panel. The prevalence of heart failure was 9.1% based on clinically diagnosed compared with 13.3% (95% confidence interval [CI], 10.3-16.2%) estimated by the expert panel. Overall agreement and inter-rater reliability (kappa) among heart failure experts were 95% and 0.79, respectively. Based upon expert adjudication, heart failure was clinically diagnosed with an accuracy of 92.8% (90.6-95.1%), sensitivity 57.4% (53.1-61.7%), specificity 98.3% (97.1-99.4%), positive predictive value 83.5% (80.3-86.8%), and negative predictive value 93.8% (91.7-95.9%).

Conclusions

Limitations exist to the preoperative clinical diagnosis of heart failure, with nearly half of cases undiagnosed preoperatively. Considering the risks of undiagnosed heart failure, efforts to improve preoperative heart failure diagnoses are warranted.

The effect of overlapping surgical scheduling on operating theatre productivity: a narrative review

This article reviews the background to overlapping surgery, in which a single senior surgeon operates across two parallel operating theatres; anaesthesia is induced and surgery commenced by junior surgeons in the second operating theatre while the lead surgeon completes the operation in the first. We assess whether there is any theoretical basis to expect increased productivity in terms of number of operations completed. A review of observational studies found that while there is a perception of increased surgical output for one surgeon, there is no evidence of increased productivity compared with two surgeons working in parallel. There is potential for overlapping surgery to have some positive impact in situations where turnover times between cases are long, operations are short (<2 h) and where 'critical portions' of surgery constitute about half of the total operation time. However, any advantages must be balanced against safety, ethical and training concerns.

Fluids, vasopressors, and acute kidney injury after major abdominal surgery between 2015 and 2019: a multicentre retrospective analysis

BACKGROUND

Practice patterns related to intraoperative fluid administration and vasopressor use have potentially evolved over recent years. However, the extent of such changes and their association with perioperative outcomes, such as the development of acute kidney injury (AKI), have not been studied.

METHODS

We performed a retrospective analysis of major abdominal surgeries in adults across 26 US hospitals between 2015 and 2019. The primary outcome was AKI as defined by the Kidney Disease Improving Global Outcomes definition (KDIGO) using only serum creatinine criteria. Univariable linear predictive additive models were used to describe the dose-dependent risk of AKI given fluid administration or vasopressor use.

RESULTS

Over the study period, we observed a decrease in the volume of crystalloid administered, a decrease in the proportion of patients receiving more than 10 ml kg^-1 h^-1 of crystalloid, an increase in the amount of norepinephrine equivalents administered, and a decreased duration of hypotension. The incidence of AKI increased between 2016 and 2019. An increase of crystalloid administration from 1 to 10 ml kg^-1 h^-1 was associated with a 58% decreased risk of AKI.

CONCLUSIONS

Despite decreased duration of hypotension during the study period, decreased fluid administration and increased vasopressor use were associated with increased incidence of AKI. Crystalloid administration below 10 ml kg^-1 h^-1 was associated with an increased risk of AKI. Although no causality can be concluded, these data suggest that prevention and treatment of hypotension during abdominal surgery with liberal use of vasopressors at the expense of fluid administration is associated with an increased risk of postoperative AKI.

Analysis of risk factors for perioperative complications in spine surgery

Complications in spine surgery can arise in the intraoperative or the immediate postoperative period or in a delayed manner. These complications may lead to severe or even permanent morbidity if left undiagnosed and untreated. We prospectively interviewed 526 patients out of 1140 patients who consecutively underwent spinal surgery in our department between November 2017 and November 2018 and analysed the outcome and complication rates. A 12 months follow-up period was also adopted. We analysed the patients' clinical characteristics, comorbidities, surgical management, survival rates, and outcomes. Risk factor analyses for the development of complications were also performed. Patients' median age was 67 years (range: 13-96). The main diagnoses were as follows: degenerative in 50%, tumour in 22%, traumatic fractures in 13%, infections in 10%, reoperations in 3%, and others in 2%. Surgeries were emergency procedures (within 24 h) in 12%. Furthermore, 59% required instrumentation. The overall postoperative complication rate was 26%. Revision surgery was required in 12% of cases within 30 postoperative days (median time to revision 11 days [IQR 5-15 days]). The most frequent complications included wound healing disorders, re-bleeding, and CSF leakage. Thereby, the risk factor analysis revealed age-adjusted CCI (p = 0.01), metastatic tumour (p = 0.01), and atrial fibrillation (p = 0.02) as significant risk factors for postoperative complications. Additionally, postoperative KPS (p = 0.004), postoperative anaemia (p = 0.001), the length of hospital stay (p = 0.02), and duration of surgery (p = 00.002) were also identified as associated factors. Complication rates after spinal surgeries are still high, especially in patients with metastatic tumour disease and poor clinical status (KPS), requiring revision surgeries in several cases. Therefore, specific risk factors should be determined to carefully select surgery groups.

Association of Anesthesiologist Staffing Ratio With Surgical Patient Morbidity and Mortality

Importance

Recent studies have investigated the effect of overlapping surgeon responsibilities or nurse to patient staffing ratios on patient outcomes, but the association of overlapping anesthesiologist responsibilities with patient outcomes remains unexplored to our knowledge.

Objective

To examine the association between different levels of anesthesiologist staffing ratios and surgical patient morbidity and mortality.

Design, Setting, and Participants

A retrospective, matched cohort study consisting of major noncardiac inpatient surgical procedures performed from January 1, 2010, to October 31, 2017, was conducted in 23 US academic and private hospitals. A total of 866 453 adult patients (aged ≥18 years) undergoing major inpatient surgery within the Multicenter Perioperative Outcomes Group electronic health record registry were included. Anesthesiologist sign-in and sign-out times were used to calculate a continuous time-weighted average staffing ratio variable for each operation. Propensity score-matching methods were applied to create balanced sample groups with respect to patient-, operative-, and hospital-level confounders and resulted in 4 groups based on anesthesiologist staffing ratio. Groups consisted of patients receiving care from an anesthesiologist covering 1 operation (group 1), more than 1 to no more than 2 overlapping operations (group 1-2), more than 2 to no more than 3 overlapping operations (group 2-3), and more than 3 to no more than 4 overlapping operations (group 3-4). Data analysis was performed from October 2019 to October 2021.

Exposure

Undergoing a major inpatient surgical operation that involved an anesthesiologist providing care for up to 4 overlapping operations.

Main Outcomes and Measures

The primary composite outcome was 30-day mortality and 6 major surgical morbidities (cardiac, respiratory, gastrointestinal, urinary, bleeding, and infectious complications) derived from International Classification of Diseases, Ninth Revision and International Statistical Classification of Diseases and Related Health Problems, Tenth Revision discharge diagnosis codes.

Results

In all, 578 815 adult patients (mean [SD] age, 55.7 [16.2] years; 55.1% female) were analyzed. After matching operations according to anesthesiologist staffing ratio, 48 555 patients were in group 1; 247 057, group 1-2; 216 193, group 2-3; and 67 010, group 3-4. Increasing anesthesiologist coverage responsibilities was associated with an increase in risk-adjusted surgical patient morbidity and mortality. Compared with patients in group 1-2, those in group 2-3 had a 4% relative increase in risk-adjusted mortality and morbidity (5.06% vs 5.25%; adjusted odds ratio [AOR], 1.04; 95% CI, 1.01-1.08; P = .02) and those in group 3-4 had a 14% increase in risk-adjusted mortality and morbidity (5.06% vs 5.75%; AOR, 1.15; 95% CI, 1.09-1.21; P < .001).

Conclusions and Relevance

This study's findings suggest that increasing overlapping coverage by anesthesiologists is associated with increased surgical patient morbidity and mortality. Therefore, the potential effects of staffing ratios in perioperative team models should be considered in clinical coverage efforts.

Assessment of Perioperative Outcomes Among Surgeons Who Operated the Night Before

IMPORTANCE

The association between physician fatigue and patient outcomes is important to understand but has been difficult to examine given methodological and data limitations. Surgeons frequently perform urgent procedures overnight and perform additional procedures the following day, which could adversely affect outcomes for those daytime operations.

OBJECTIVE

To examine the association between an attending surgeon operating overnight and outcomes for operations performed by that surgeon the next day.

DESIGN, SETTING, AND PARTICIPANTS

In this cross-sectional study, a retrospective analysis of a large multicenter registry of surgical procedures was done using a within-surgeon analysis to address confounding, with data from 20 high-volume US institutions. This study included 498 234 patients who underwent a surgical procedure during the day (between 7 am and 5 pm) between January 1, 2010, and August 30, 2020.

EXPOSURES

Whether the attending surgeon for the current day's procedures operated between 11 pm and 7 am the previous night. Two exposure measures were examined: whether the surgeon operated at all the previous night and the number of hours spent operating the previous night (including having performed no work at all).

MAIN OUTCOMES AND MEASURES

The primary composite outcome was in-hospital death or major complication (sepsis, pneumonia, myocardial infarction, thromboembolic event, or stroke). Secondary outcomes included operation length and individual outcomes of death, major complications, and minor complications (surgical site infection or urinary tract infection).

RESULTS

Among 498 234 daytime operations performed by 1131 surgeons, 13 098 (2.6%) involved an attending surgeon who operated the night before. The mean (SD) age of the patients who underwent an operation was 55.3 (16.4) years, and 264 740 (53.1%) were female. After adjusting for operation type, surgeon fixed effects, and observable patient characteristics (ie, age and comorbidities), the adjusted incidence of in-hospital death or major complications was 5.89% (95% CI, 5.41%-6.36%) among daytime operations when the attending surgeon operated the night before compared with 5.87% (95% CI, 5.85%-5.89%) among daytime operations when the same surgeon did not (absolute adjusted difference, 0.02%; 95% CI, -0.47% to 0.51%; P = .93). No significant associations were found between overnight work and secondary outcomes except for operation length. Operating the previous night was associated with a statistically significant decrease in length of daytime operations (adjusted length, 112.7 vs 117.4 minutes; adjusted difference, -4.7 minutes; 95% CI, -8.7 to -0.8, P = .02), although this difference is unlikely to be meaningful.

CONCLUSIONS AND RELEVANCE

The findings of this cross-sectional study suggest that operating overnight was not associated with worse outcomes for operations performed by surgeons the subsequent day. These results provide reassurance concerning the practice of having attending surgeons take overnight call and still perform operations the following morning.

Overlapping surgery in arthroplasty - a systematic review and meta-analysis

BACKGROUND

Planned overlapping surgery can improve efficiency, reduce costs and help manage long waiting lists; yet, this practice has been questioned due to patient safety concerns. A systematic review and meta-analysis were performed to answer the question: (1) are there any differences in the risk of postoperative adverse outcomes; and (2) are there any differences in length of stay or length of surgery, in elective total hip arthroplasty (THA) and total knee arthroplasty (TKA) performed either as non-overlapping surgery (NOS) or overlapping surgery (OS).

PATIENTS AND METHODS

A systematic search of literature in the databases of MEDLINE, PubMed, Embase and Cochrane from dates of inception was performed. All studies published in English were included. Risk of Bias in Non-randomised Studies-of Interventions (ROBINS-I) and the Grading of Recommendations, Assessment, Development and Evaluation (GRADE) framework were utilised. Relative risk (RR) was used for dichotomous outcomes, while mean difference (MD) was used for continuous variables, with 95% confidence intervals. Alpha was set at 0.05.

RESULTS

A total of nine studies with 120,625 patients were included for analyses. There were no statistically significant differences for overall rates of postoperative complications, dislocations, fractures, infections, readmissions or revision surgery nor with length of stay or length of surgery (p>0.05). Patient characteristics between groups were similar (p>0.05).

DISCUSSION

There were no differences in postoperative adverse outcomes for elective orthopaedic THA and TKA performed as NOS when compared to OS. Operating schedules for OS in elective lower limb arthroplasty appear to be safe, given appropriate patient selection processes and may be a useful method to improve hospital efficiency. Informed consent and preoperative patient education should remain paramount.

LEVEL OF EVIDENCE

IV.

Health Services Research in Anesthesia: A Brief Overview of Common Methodologies

The use of large data sources such as registries and claims-based data sets to perform health services research in anesthesia has increased considerably, ultimately informing clinical decisions, supporting evaluation of policy or intervention changes, and guiding further research. These observational data sources come with limitations that must be addressed to effectively examine all aspects of health care services and generate new individual- and population-level knowledge. Several statistical methods are growing in popularity to address these limitations, with the goal of mitigating confounding and other biases. In this article, we provide a brief overview of common statistical methods used in health services research when using observational data sources, guidance on their interpretation, and examples of how they have been applied to anesthesia-related health services research. Methods described involve regression, propensity scoring, instrumental variables, difference-in-differences, interrupted time series, and machine learning.

Multicentre analysis of practice patterns regarding benzodiazepine use in cardiac surgery

BACKGROUND

There is controversy regarding optimal use of benzodiazepines during cardiac surgery, and it is unknown whether and to what extent there is variation in practice. We sought to describe benzodiazepine use and sources of variation during cardiac surgeries across patients, clinicians, and institutions.

METHODS

We conducted an analysis of adult cardiac surgeries across a multicentre consortium of USA academic and private hospitals from 2014 to 2019. The primary outcome was administration of a benzodiazepine from 2 h before anaesthesia start until anaesthesia end. Institutional-, clinician-, and patient-level variables were analysed via multilevel mixed-effects models.

RESULTS

Of 65 508 patients cared for by 825 anaesthesiology attending clinicians (consultants) at 33 institutions, 58 004 patients (88.5%) received benzodiazepines with a median midazolam-equivalent dose of 4.0 mg (inter-quartile range [IQR], 2.0-6.0 mg). Variation in benzodiazepine dosage administration was 54.7% attributable to institution, 14.7% to primary attending anaesthesiology clinician, and 30.5% to patient factors. The adjusted median odds ratio for two similar patients receiving a benzodiazepine was 2.68 between two randomly selected clinicians and 4.19 between two randomly selected institutions. Factors strongly associated (adjusted odds ratio, <0.75, or >1.25) with significantly decreased likelihoods of benzodiazepine administration included older age (>80 vs ≤50 yr; adjusted odds ratio=0.04; 95% CI, 0.04-0.05), university affiliation (0.08, 0.02-0.35), recent year of surgery (0.42, 0.37-0.49), and low clinician case volume (0.44, 0.25-0.75). Factors strongly associated with significantly increased likelihoods of benzodiazepine administration included cardiopulmonary bypass (2.26, 1.99-2.55), and drug use history (1.29, 1.02-1.65).

CONCLUSIONS

Two-thirds of the variation in benzodiazepine administration during cardiac surgery are associated with institutions and attending anaesthesiology clinicians (consultants). These data, showing wide variations in administration, suggest that rigorous research is needed to guide evidence-based and patient-centred benzodiazepine administration.

Outcomes and Patient Safety in Overlapping vs. Nonoverlapping Total Joint Arthroplasty: A Systematic Review and Meta-Analysis

INTRODUCTION

Overlapping surgery is defined as two cases occurring in separate operating rooms (ORs), where the same attending surgeon conducts the critical surgical portions of each case at different times. Although it has been suggested that this established practice may improve the utilization of resources, allow for more opportunities to teach surgical trainees, and facilitate timely access to care, there is still no consensus on its use in elective orthopaedic surgery, such as total joint arthroplasty (TJA).

METHODS

A systematic review and meta-analysis of the literature was done according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines to identify articles investigating the use of overlapping and single operating room TJA. Relevant data, including surgical time, intraoperative complications, postoperative complications, mortality rate, revision rate, and readmission rate, were extracted and recorded.

RESULTS

Six articles were included (35,938 patients: 17,677 overlapping and 18,261 nonoverlapping). Overall revision rates were 1.2% and 1.1% for the overlapping and nonoverlapping cohorts, respectively (odds ratio [OR] = 1.19; 95% confidence interval [CI]: 0.93 to 1.53). The overall intraoperative complication rate was 1.6% for both cohorts (OR = 0.98; 95% CI: 0.79 to 1.23), and the overall postoperative orthopaedic complication rates were 2.0% and 1.95% within the overlapping and nonoverlapping OR cohorts, respectively (OR = 1.07; 95% CI: 0.89 to 1.29). The readmission rate was 4.6% in the overlapping group and 4.2% in the nonoverlapping group (OR = 0.88; 95% CI: 0.70 to 1.11). Two studies with comparable groups reported markedly increased surgical time in the overlapping group compared with the nonoverlapping group.

DISCUSSION

Overlapping surgery was found to be as safe as nonoverlapping surgery in patients undergoing TJA. Although overlapping TJA surgery is associated with satisfactory short-term revision rates, prolonged follow-up is required to further assess the medium-term and long-term outcomes of overlapping surgery compared with nonoverlapping surgery. Finally, although overlapping TJA surgery might be associated with increased OR time, this difference is not clinically relevant.

Adherence to Guidelines for the Administration of Intraoperative Antibiotics in a Nationwide US Sample

IMPORTANCE

Despite widespread adherence to Surgical Care Improvement Project antibiotic measures, prevention of surgical site infections (SSIs) remains a clinical challenge. Several components of perioperative antibiotic prophylaxis guidelines are incompletely monitored and reported within the Surgical Care Improvement Project program.

OBJECTIVES

To describe adherence to each component of perioperative antibiotic prophylaxis guidelines in regard to procedure-specific antibiotic choice, weight-adjusted dosing, and timing of first and subsequent administrations in a nationwide, multicenter cohort of patients undergoing noncardiac surgery.

DESIGN, SETTING, AND PARTICIPANTS

This cohort study included adult patients undergoing general, urological, orthopedic, and gynecological surgical procedures involving skin incision between January 1, 2014, and December 31, 2018, across 31 academic and community hospitals identified within the Multicenter Perioperative Outcomes Group registry. Data were analyzed between April 2 and April 21, 2021.

MAIN OUTCOMES AND MEASURES

The primary end point was overall adherence to Infectious Diseases Society of America guidelines, including (1) appropriateness of antibiotic choice, (2) weight-based dose adjustment, (3) timing of administration with respect to surgical incision, and (4) timing of redosing when indicated. Data were analyzed using mixed-effects regression to investigate patient, clinician, and institutional factors associated with guideline adherence.

RESULTS

In the final cohort of 414 851 encounters across 31 institutions, 51.8% of patients were women, the mean (SD) age was 57.5 (15.7) years, 1.2% of patients were of Hispanic ethnicity, and 10.2% were Black. In this cohort, 148 804 encounters (35.9%) did not adhere to guidelines: 19.7% for antibiotic choice, 17.1% for weight-adjusted dosing, 0.6% for timing of first dose, and 26.8% for redosing. In adjusted analyses, overall nonadherence was associated with emergency surgery (odds ratio [OR], 1.35; 95% CI, 1.29-1.41; P < .001), surgery requiring blood transfusions (OR, 1.30; 95% CI, 1.25-1.36; P < .001), off-hours procedures (OR, 1.08; 95% CI, 1.04-1.13; P < .001), and procedures staffed by a certified registered nurse anesthetist (OR, 1.14; 95% CI, 1.11-1.17; P < .001). Overall adherence to guidelines for antibiotic administration improved over the study period from 53.1% (95% CI, 52.7%-53.5%) in 2014 to 70.2% (95% CI, 69.8%-70.6%) in 2018 (P < .001).

CONCLUSIONS AND RELEVANCE

In this cohort study, although adherence to perioperative antibiotic administration guidelines improved over the study period, more than one-third of surgical encounters remained discordant with Infectious Diseases Society of America recommendations. Future quality improvement efforts targeting gaps in practice in relation to guidelines may lead to improved adherence and possibly decreased SSIs.

Surgeon Perspectives on Benefits and Downsides of Overlapping Surgery: In-depth, Qualitative Interviews

OBJECTIVE

The aim of the study was to characterize surgeon perspectives regarding the benefits and downsides of conducting overlapping surgery.

BACKGROUND

Although surgeons are key stakeholders in current discussions surrounding overlapping surgery, little has been published regarding their opinions on the practice. Further characterization of surgeon perspectives is needed to guide future studies and policy development regarding overlapping surgery.

METHODS

Study information was sent to all members of 3 professional surgical societies. Interested individuals were eligible to participate if they identified as attending surgeons in an academic setting who work with trainees. Purposive selection was used to diversify surgeons interviewed across multiple dimensions, including subspecialty and opinion regarding appropriateness of overlapping surgery. In-depth, qualitative interviews were conducted with participants regarding their opinions on overlapping surgery.

RESULTS

The 51 surgeons interviewed identified a wide array of potential benefits and disadvantages of overlapping surgery, some of which have not previously been measured, including downsides to surgeon wellness and patient experience, less surgeon control over procedures, and difficulty in scheduling cases. Interviewees often disagreed as to whether overlapping surgery negatively or positively affects each dimension discussed, particularly regarding the impact on resident training.

CONCLUSIONS

The utilization of the novel perspectives presented here will allow for targeted assessment of physician perspectives in future quantitative studies and increase the likelihood that variables measured encompass the range of factors that surgeons find meaningful and relevant. Priority areas of future research should include examining effects of overlapping surgery on surgical training and surgeon wellness.

The Role of the Resident Doctor in Orthopedics and Traumatology in a Large Hospital of the Unified Health System: What is the User's view?

Objective  To assess the knowledge of patients seen at a teaching hospital about the academic and professional training of the resident doctor in orthopedics and traumatology, as well as his area of expertise, and determine the perception of the patients of comfort and safety in relation to being assisted by the resident doctor at different stages of treatment.

Methods  A cross-sectional study was conducted with patients admitted to a large orthopedics hospital of the Brazilian Unified Health System (SUS, in the Portuguese acronym). Data were collected through the application of a questionnaire containing 19 objective questions that assessed sociodemographic parameters and the perception of the patient of the performance of the resident. The data were analyzed to assess the frequency of responses obtained.

Results  152 participants were evaluated, predominantly male (62.6%) and aged between 36 and 55 years old (41.3%). Only 43.3% were aware of the academic background of the resident. Patients reported feeling safer and more comfortable being assisted by the doctor together with the resident in the outpatient consultation (43.3%), in the nursing ward (39.3%) and during surgery (61%). As for the performance of the resident, 80.2% stated that the resident doctor improves communication between the patient and the main surgeon; however, only 11% said they would feel safe and comfortable being cared for exclusively by residents in the surgical environment, if allowed.

Conclusion  The participation of resident physicians in the care is well received by the patients if they are in the company of the attending physician. Patients identify residents as a facilitating bridge in the communication with attending physicians.

The impact of operative approach on postoperative outcomes and healthcare utilization after colectomy

BACKGROUND

To evaluate national trends in adoption of different surgical approaches for colectomy and compare clinical outcomes and resource utilization between approaches.

METHODS

Retrospective study of patients aged ≥18 years who underwent elective inpatient left or right colectomy between 2010 and 2019 from the Premier Healthcare Database. Patients were classified by operative approach: open, minimally invasive: either laparoscopic or robotic. Postoperative outcomes assessed within index hospitalization include operating room time, hospital length of stay, rates of conversion to open surgery, reoperation, and complications. Post-discharge readmission, hospital-based encounters, and costs were collected to 30 days post-discharge. Multivariable regression models were used to compare outcomes between operative approaches adjusted for patient baseline characteristics and clustering within hospitals.

RESULTS

Among 206,967 patients, the robotic approach rates increased from 2.1%/1.6% (2010) to 32.6%/26.8% (2019) for left/right colectomy, offset by a decrease in both open and laparoscopic approaches. Median length of stay for both left and right colectomies was significantly longer in open (6 days) and laparoscopic (5 days) compared to robotic surgery (4 days; all P values <.001). Robotic surgery compared to open and laparoscopic was associated with a significantly lower conversion rate, development of ileus, overall complications, and 30-day hospital encounters. Robotic surgery further demonstrated lower mortality, reoperations, postoperative bleeding, and readmission rates for left and right colectomies than open. Robotic surgery had significantly longer operating room times and higher costs than either open or laparoscopic.

CONCLUSIONS

Robotic surgery is increasingly being used in colon surgery, with outcomes equivalent and in some domains superior to laparoscopic.

Biological applications of copper-containing materials

Copper is an indispensable trace metal element in the human body, which is mainly absorbed in the stomach and small intestine and excreted into the bile. Copper is an important component and catalytic agent of many enzymes and proteins in the body, so it can influence human health through multiple mechanisms. Based on the biological functions and benefits of copper, an increasing number of researchers in the field of biomaterials have focused on developing novel copper-containing biomaterials, which exhibit unique properties in protecting the cardiovascular system, promoting bone fracture healing, and exerting antibacterial effects. Copper can also be used in promoting incisional wounds healing, killing cancer cells, Positron Emission Tomography (PET) imaging, radioimmunological tracing and radiotherapy of cancer. In the present review, the biological functions of copper in the human body are presented, along with an overview of recent progress in our understanding of the biological applications and development of copper-containing materials. Furthermore, this review also provides the prospective on the challenges of those novel biomaterials for future clinical applications.

Reduced Echocardiographic Inotropy Index after Cardiopulmonary Bypass Is Associated With Complications After Cardiac Surgery: An Institutional Outcomes Study

OBJECTIVE

Despite advances in echocardiography and hemodynamic monitoring, limited progress has been made to effectively quantify left ventricular function during cardiac surgery. Traditional measures, including left ventricular ejection fraction (LVEF) and cardiac index, remain dependent on loading conditions; more complex measures remain impractical in a dynamic surgical setting. However, the Smith-Madigan Inotropy Index (SMII) and potential-to-kinetic energy ratio (PKR) offer promise as measures calculable during cardiac surgery and potentially predictive of outcomes. Using echocardiographic and hemodynamic monitoring data, the authors aimed to calculate SMII and PKR values after cardiopulmonary bypass and understand associations with postoperative outcomes, adjusting for previously identified risk factors.

DESIGN

Observational cohort study.

SETTING

Tertiary care academic hospital.

PATIENTS

The study comprised 189 elective adult cardiac surgical procedures from 2015-2016.

INTERVENTION

None.

MEASUREMENTS AND MAIN RESULTS

The primary outcome was postoperative mortality or organ system complication (stroke, prolonged ventilation, reintubation, cardiac arrest, acute kidney injury, new-onset atrial fibrillation). After adjustment, SMII <0.83 W/m² independently predicted the primary outcome (adjusted odds ratio 2.19, 95% confidence interval 1.08-4.42); whereas PKR, LVEF, and cardiac index demonstrated no associations. When SMII and PKR were incorporated into a EuroSCORE II risk model, predictive performance improved (net reclassification index improvement 0.457; p = 0.001); whereas a model incorporating LVEF and cardiac index demonstrated no improvement (0.130; p = 0.318).

CONCLUSION

The present study demonstrated that SMII, but not PKR, as a measure of cardiac function was associated with major complications. The study's data may guide investigations of more suitable perioperative goal-directed therapies to reduce complications after cardiac surgery.

A Survey of Overlapping Surgery Policies at U.S. Hospitals

The authors surveyed hospitals across the country on their policies regarding overlapping surgery, and found large variation between hospitals in how this practice is regulated. Specifically, institutions chose to define "critical portions" in a variety of ways, ultimately affecting not only surgical efficiency but also the autonomy of surgical trainees and patient experiences at these different hospitals.

Overlapping Urological Surgeries at a Tertiary Academic Center

OBJECTIVE

To evaluate whether the practice of procedure-time overlapping surgery (OS) is associated with inferior outcomes compared to nonoverlapping surgery (NOS) in urology, to address the paucity of data surrounding urologic surgeries to support or refute this practice.

MATERIALS AND METHODS

We performed a retrospective review of all urological surgeries at a single tertiary-level academic center, Emory University Hospital, from July 2016 to July 2018. Patients who received OS were matched 1:2 to patients who had NOS. The primary outcomes were perioperative and postoperative complications and mortality.

RESULTS

We reviewed 8535 urological surgeries. In-room time overlap was seen in 50.5% of cases and procedure-time overlap in 7.4%. Eleven out of the 13 attending urologists performed OS. The average time in the operating room was greater for OS by an average of 14 minutes. The average operative time was greater for OS than NOS by 11 minutes, but this did not reach statistical significance. There was no significant difference between the cohorts for rate of blood transfusions, ICU stay, need for postoperative invasive procedures, length of postoperative hospital stay, discharge location, Emergency Room visits, hospital readmission rate, 30 and 90-day rates of postoperative complications, and mortality.

CONCLUSION

Procedure-time overlapping surgeries constituted a minority of urological cases. OS were associated with greater in-room time. We found no increased risk of perioperative or postoperative adverse outcomes in OS compared to matched NOS.

Comparison of single-stage and two-stage bilateral video-assisted thoracic surgery

OBJECTIVE

Single-stage sequential bilateral video-assisted thoracoscopic surgery (VATS) is a controversial procedure. In the present study, we retrospectively compared the outcomes of single-stage and two-stage VATS.

METHODS

This study involved patients who underwent single-stage sequential bilateral VATS (SS-VATS group) or two-stage VATS at a 3-month interval (TS-VATS group) for treatment of non-small cell lung cancer from 2010 to 2018. The major outcome was the comparison of intraoperative changes.

RESULTS

The inspiratory peak pressure was higher, the incidences of intraoperative hypoxia and unstable hemodynamics were higher, the surgical time was longer, and the durations of the intensive care unit stay and postoperative hospitalization were longer in the SS-VATS group than in the TS-VATS group. However, the chest tube duration, incidence of postoperative mechanical ventilation, and clinical complications were not different between the two groups.

CONCLUSIONS

Compared with two-stage VATS, single-stage sequential bilateral VATS can be performed for successful treatment of bilateral pulmonary lesions with a shorter total time and higher cost-effectiveness in terms of anesthesia and hospitalization but with a higher incidence of intraoperative adverse effects and a longer hospital stay.

An Analysis of Anesthesia Induction Dosing in Female Older Adults

BACKGROUND/OBJECTIVES

In the context of an aging surgical population, appropriate anesthetic induction dose adjustments for the older adult remain poorly defined. In the present study, we describe the prevalence of excess induction agent dose in reference to US Food and Drug Administration (FDA) guidance and seek to investigate the possible association of such excess dose with postinduction hypotension and postoperative acute kidney injury (AKI).

STUDY DESIGN

A retrospective observational study was conducted in a large tertiary teaching hospital in accordance with our a priori analytic protocol as registered on ClinicalTrials.gov (NCT03699696). For inclusion, patients had to be 65 years or older and to have received general anesthesia with propofol induction for gynecologic oncology surgery between December 1, 2014 and July 8, 2018. Descriptive variables of the patients, machine-captured perioperative vital signs, induction anesthetic, and vasopressor/inotrope administrations were recorded.

MAIN OUTCOME MEASURES

A total of 541 female patients met inclusion criteria. The mean (standard deviation) age of the cohort was 72.20 (5.93) years. Regarding the primary outcome, 65.43% (354 patients, 95% confidence interval 61.2-69.4) of the cohort received more than the FDA recommended 1-1.5 mg/kg induction dose for patients of advanced age undergoing general anesthesia.

RESULTS

The percentage of patients receiving doses in excess of the FDA guidance remained substantial across all age groups, but decreased progressively with increasing 5-year age intervals (from 74% among those aged 65-69 years to 44% among those aged > 80 years). Excess propofol dose in the present cohort was not associated with our a priori definition of postinduction hypotension. Regarding AKI, among the 30 patients suffering this outcome, it occurred less often in patients who received higher propofol doses (4.1% [9/217] vs. 15.3% [21/138], p < 0.001), a result that may have been confounded by differential rates of missingness.

CONCLUSIONS

Older adults commonly receive propofol induction doses in excess of the FDA guidance. The immediate hemodynamic effects of these doses on postinduction hypotension were not seen in the present cohort, suggesting that propofol dose adjustments may serve as a marker of physicians' judgments as to the frailty of patients. The relevance of the AKI association is difficult to interpret due to the non-differential missingness of AKI data between the two groups.

Determining Associations and Estimating Effects with Regression Models in Clinical Anesthesia

There are an increasing number of "big data" studies in anesthesia that seek to answer clinical questions by observing the care and outcomes of many patients across a variety of care settings. This Readers' Toolbox will explain how to estimate the influence of patient factors on clinical outcome, addressing bias and confounding. One approach to limit the influence of confounding is to perform a clinical trial. When such a trial is infeasible, observational studies using robust regression techniques may be able to advance knowledge. Logistic regression is used when the outcome is binary (e.g., intracranial hemorrhage: yes or no), by modeling the natural log for the odds of an outcome. Because outcomes are influenced by many factors, we commonly use multivariable logistic regression to estimate the unique influence of each factor. From this tutorial, one should acquire a clearer understanding of how to perform and assess multivariable logistic regression.

An Examination of Medical Malpractice Claims Involving Physician Trainees

PURPOSE

To identify patient-, provider-, and claim-related factors of medical malpractice claims in which physician trainees were directly involved in the harm events.

METHOD

The authors performed a case-control study using medical malpractice claims closed between 2012-2016 and contributed to the Comparative Benchmarking System database by teaching hospitals. Using the service extender flag, they classified claims as cases if physician trainees were directly involved in the harm events. They classified claims as controls if they were from the same facilities, but trainees were not directly involved in the harm events. They performed multivariable regression with predictor variables being patient and provider characteristics. The outcome was physician trainee involvement in harm events.

RESULTS

From the original pool of 30,973 claims, there were 581 cases and 2,610 controls. The majority of cases involved residents (471, 81%). Cases had a statistically significant higher rate of having a trainee named as defendants than controls (184, 32% vs 233, 9%; P < .001). The most common final diagnosis for cases was puncture or laceration during surgery (62, 11%). Inadequate supervision was a contributing factor in 140 (24%) cases overall, with the majority (104, 74%) of these claims being procedure related. Multivariable regression analysis revealed that trainees were most likely to be involved in harm events in specialties such as oral surgery/dentistry and obstetrics-gynecology (OR = 7.99, 95% CI 2.93, 21.83 and OR = 1.85, 95% CI 1.24, 2.66, respectively), when performing procedures (OR = 1.58, 95% CI 1.27, 1.96), or when delivering care in the emergency room (OR = 1.65, 95% CI 1.43, 1.91).

CONCLUSIONS

Among claims involving physician trainees, procedures were common and often associated with inadequate supervision. Training directors of surgical specialties can use this information to improve resident supervision policies. The goal is to reduce the likelihood of future harm events.

Classification of Current Procedural Terminology Codes from Electronic Health Record Data Using Machine Learning

BACKGROUND

Accurate anesthesiology procedure code data are essential to quality improvement, research, and reimbursement tasks within anesthesiology practices. Advanced data science techniques, including machine learning and natural language processing, offer opportunities to develop classification tools for Current Procedural Terminology codes across anesthesia procedures.

METHODS

Models were created using a Train/Test dataset including 1,164,343 procedures from 16 academic and private hospitals. Five supervised machine learning models were created to classify anesthesiology Current Procedural Terminology codes, with accuracy defined as first choice classification matching the institutional-assigned code existing in the perioperative database. The two best performing models were further refined and tested on a Holdout dataset from a single institution distinct from Train/Test. A tunable confidence parameter was created to identify cases for which models were highly accurate, with the goal of at least 95% accuracy, above the reported 2018 Centers for Medicare and Medicaid Services (Baltimore, Maryland) fee-for-service accuracy. Actual submitted claim data from billing specialists were used as a reference standard.

RESULTS

Support vector machine and neural network label-embedding attentive models were the best performing models, respectively, demonstrating overall accuracies of 87.9% and 84.2% (single best code), and 96.8% and 94.0% (within top three). Classification accuracy was 96.4% in 47.0% of cases using support vector machine and 94.4% in 62.2% of cases using label-embedding attentive model within the Train/Test dataset. In the Holdout dataset, respective classification accuracies were 93.1% in 58.0% of cases and 95.0% among 62.0%. The most important feature in model training was procedure text.

CONCLUSIONS

Through application of machine learning and natural language processing techniques, highly accurate real-time models were created for anesthesiology Current Procedural Terminology code classification. The increased processing speed and a priori targeted accuracy of this classification approach may provide performance optimization and cost reduction for quality improvement, research, and reimbursement tasks reliant on anesthesiology procedure codes.

Barriers to Revision Total Hip Service Lines: A Surgeon's Perspective Through a Deterministic Financial Model

BACKGROUND

Revision THA represents approximately 5% to 10% of all THAs. Despite the complexity of these procedures, revision arthroplasty service lines are generally absent even at high-volume orthopaedic centers. We wanted to evaluate whether financial compensation is a barrier for the development of revision THA service lines as assessed by RVUs.

QUESTIONS/PURPOSES

Therefore, we asked: (1) Are physicians fairly compensated for revision THA on a per-minute basis compared with primary THA? (2) Are physicians fairly compensated for revision THA on a per-day basis compared with primary THA?

METHODS

Our deterministic financial model was derived from retrospective data of all patients undergoing primary or revision THA between January 2016 and June 2018 at an academic healthcare organization. Patients were divided into five cohorts based on their surgical procedure: primary THA, head and liner exchange, acetabular component revision THA, femoral component revision THA, and combined femoral and acetabular component revision THA. Mean surgical times were calculated for each cohort, and each cohort was assigned a relative value unit (RVU) derived from the 2018 Center for Medicaid and Medicare assigned RVU fee schedule. Using a combination of mean surgical time and RVUs rewarded for each procedure, three models were developed to assess the financial incentive to perform THA services for each cohort. These models included: (1) RVUs earned per the mean surgical time, (2) RVUs earned for a single operating room for a full day of THAs, and (3) RVUs earned for two operating rooms for a full day of primary THAs versus a single rooms for a full day of revision THAs. A sixth cohort was added in the latter two models to more accurately reflect the variety in a typical surgical day. This consisted of a blend of revision THAs: one acetabular, one femoral, and one full revision. The RVUs generated in each model were compared across the cohorts.

RESULTS

Compared with primary THA by RVU per minute, in revision THA, head and liner exchange demonstrated a 4% per minute deficit, acetabular component revision demonstrated a 29% deficit, femoral component revision demonstrated a 32% deficit, and full revision demonstrated a 27% deficit. Compared with primary service lines with one room, revision surgeons with a variety of revision THA surgeries lost 26% potential relative value units per day. Compared with a two-room primary THA service, revision surgeons lost 55% potential relative value units per day.

CONCLUSIONS

In a comparison of relative value units of a typical two-room primary THA service line versus those of a dedicated revision THA service line, we found that revision specialists may lose between 28% and 55% of their RVU earnings. The current Centers for Medicare and Medicaid Services reimbursement model is not viable for the arthroplasty surgeon and limits patient access to revision THA specialists.

LEVEL OF EVIDENCE

Level III, economic and decision analysis.

Sugammadex versus Neostigmine for Reversal of Neuromuscular Blockade and Postoperative Pulmonary Complications (STRONGER): A Multicenter Matched Cohort Analysis

BACKGROUND

Five percent of adult patients undergoing noncardiac inpatient surgery experience a major pulmonary complication. The authors hypothesized that the choice of neuromuscular blockade reversal (neostigmine vs. sugammadex) may be associated with a lower incidence of major pulmonary complications.

METHODS

Twelve U.S. Multicenter Perioperative Outcomes Group hospitals were included in a multicenter observational matched-cohort study of surgical cases between January 2014 and August 2018. Adult patients undergoing elective inpatient noncardiac surgical procedures with general anesthesia and endotracheal intubation receiving a nondepolarizing neuromuscular blockade agent and reversal were included. Exact matching criteria included institution, sex, age, comorbidities, obesity, surgical procedure type, and neuromuscular blockade agent (rocuronium vs. vecuronium). Other preoperative and intraoperative factors were compared and adjusted in the case of residual imbalance. The composite primary outcome was major postoperative pulmonary complications, defined as pneumonia, respiratory failure, or other pulmonary complications (including pneumonitis; pulmonary congestion; iatrogenic pulmonary embolism, infarction, or pneumothorax). Secondary outcomes focused on the components of pneumonia and respiratory failure.

RESULTS

Of 30,026 patients receiving sugammadex, 22,856 were matched to 22,856 patients receiving neostigmine. Out of 45,712 patients studied, 1,892 (4.1%) were diagnosed with the composite primary outcome (3.5% sugammadex vs. 4.8% neostigmine). A total of 796 (1.7%) patients had pneumonia (1.3% vs. 2.2%), and 582 (1.3%) respiratory failure (0.8% vs. 1.7%). In multivariable analysis, sugammadex administration was associated with a 30% reduced risk of pulmonary complications (adjusted odds ratio, 0.70; 95% CI, 0.63 to 0.77), 47% reduced risk of pneumonia (adjusted odds ratio, 0.53; 95% CI, 0.44 to 0.62), and 55% reduced risk of respiratory failure (adjusted odds ratio, 0.45; 95% CI, 0.37 to 0.56), compared to neostigmine.

CONCLUSIONS

Among a generalizable cohort of adult patients undergoing inpatient surgery at U.S. hospitals, the use of sugammadex was associated with a clinically and statistically significant lower incidence of major pulmonary complications.

Reasonable Persons, Autonomous Persons, and Lady Hale: Determining a Standard for Risk Disclosure

Among various kinds of disclosures typically required in research as well as in clinical scenarios, risk information figures prominently. A key question is, what kinds of risk information would the reasonable person want to know? I will argue, however, that the reasonable person construct is and always has been incapable of settling this very question. After parsing the nebulous if not "contentless" character of the reasonable person, I will explain how Western courts have actually adjudicated cases of "negligent nondisclosure," that is, cases in which patient-plaintiffs allege that their informed consent rights were violated by the failure of their health providers to inform them of reasonably foreseeable risks that subsequently materialized. To support my argument, I will scrutinize the landmark decision by the United Kingdom's Supreme Court in Montgomery v. Lanarkshire Health Board and, in particular, Justice Brenda Hale's concurrence.

Assessment of Short-Term Patient Outcomes Following Overlapping Orthopaedic Surgery at a Large Academic Medical Center

BACKGROUND

Overlapping surgery is a long-standing practice that has not been well studied. The aim of this study was to assess whether overlapping surgery is associated with untoward outcomes for orthopaedic patients.

METHODS

Coarsened exact matching was used to assess the impact of overlap on outcomes among elective orthopaedic surgical interventions (n = 18,316) over 2 years (2014 and 2015) at 1 health-care system. Overlap was categorized as any overlap, and subcategories of exclusively beginning overlap and exclusively end overlap. Study subjects were matched on the Charlson comorbidity index score, duration of surgery, surgical costs, body mass index, length of stay, payer, and race, among others. Serious unanticipated events were studied.

RESULTS

A total of 3,395 patients had any overlap and were matched (a match rate of 90.8% of 3,738). For beginning and end overlap, matched groups were created, with a match rate of 95.2% of 1043 and 94.7% of 863, respectively. Among matched patients, any overlap did not predict an unanticipated return to surgery at 30 days (8.2% for any overlap and 8.3% for no overlap; p = 0.922) or 90 days (14.1% and 14.1%, respectively; p = 1.000). Patients who had surgery with any overlap demonstrated no difference compared with controls with respect to reoperation, readmission, or emergency room (ER) visits at 30 or 90 days (a reoperation rate of 3.1% and 3.2%, respectively [p = 0.884] at 30 days and 4.2% and 3.5% [p = 0.173] at 90 days; a readmission rate of 10.3% and 11.0% [p = 0.352] at 30 days and 5.5% and 5.2% [p = 0.570] at 90 days; and an ER visit rate of 5.2% and 4.6% [p = 0.276] at 30 days and 4.8% and 4.3% [p = 0.304] at 90 days). Patients with surgical overlap showed reduced mortality compared with controls during follow-up (1.8% and 2.6%, respectively; p = 0.029). Patients with beginning and/or end overlap had a similar lack of association with serious unanticipated events; however, patients with end overlap showed an increased unexpected rate of return to the operating room after reoperation at 90 days (13.3% versus 9.7%; p = 0.015).

CONCLUSIONS

Nonconcurrent overlapping surgery was not associated with adverse outcomes in a large, matched orthopaedic surgery population across 1 academic health system.

LEVEL OF EVIDENCE

Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

The Role of a Resident Aesthetic Clinic in Addressing the Trainee Autonomy Gap

BACKGROUND

Our institution supports a chief resident aesthetic clinic with the goal of fostering autonomy and preparedness for independent practice in a safe environment.

OBJECTIVES

The aim of this study was to compare safety profiles and costs for common aesthetic procedures performed in our resident versus attending clinics.

METHODS

A retrospective review was conducted of all subjects presenting for aesthetic face, breast, and/or abdominal contouring surgery at our institution from 2008 to 2017. Two cohorts were identified: subjects undergoing surgery through the chief resident versus attending clinics. Aesthetic procedures queried included: (1) blepharoplasty, rhinoplasty, or rhytidectomy; (2) augmentation mammaplasty, reduction mammaplasty, or mastopexy; (3) abdominoplasty; and (4) combination. Demographics, perioperative characteristics, costs, and postoperative complications were analyzed.

RESULTS

In total, 262 and 238 subjects underwent aesthetic procedures in the resident and attending clinics, respectively. Subjects presenting to the residents were younger (P < 0.001), lower income (P < 0.001), and had fewer comorbidities (P < 0.001). Length of procedure differed between resident and attending cohorts at 181 and 152 minutes, respectively (P < 0.001), although hospital costs were not significantly increased. Total costs were higher in the attending cohort independent of aesthetic procedure (P < 0.001). Hospital readmissions (P < 0.05) and cosmetic revisions (P < 0.002) were more likely to occur in the attending physician cohort. Postoperative complications (P < 0.50) and reoperative rates (P < 0.39) were not significantly different.

CONCLUSIONS

The resident aesthetic clinic provides a mechanism for increased autonomy and decision-making, while maintaining patient safety in commonly performed cosmetic procedures.

Association of overlapping cardiac surgery with short-term patient outcomes

OBJECTIVE

This study seeks to assess the safety of overlap in cardiac surgery.

METHODS

Coarsened exact matching was used to assess the impact of overlap on outcomes among cardiac surgical interventions (n = 4463) over 2 years (2014-2016). Overlap was categorized as any, beginning, or end overlap. Study subjects were matched 1:1 on 11 variables, including Charlson comorbidity score, surgical costs, body mass index, length of postoperative hospitalization, and race, among others. Serious unanticipated events were studied, including readmission, unplanned return to the operating room, and mortality.

RESULTS

A total of 984 patients had any overlap and were matched to similar patients without overlap (n = 1501). For beginning/end overlap, separate matched groups were created (n = 462, n = 329 patients, respectively). Among matched patients, any overlap did not predict unanticipated return to surgery at 30 or 90 days. Any overlap did not predict increased readmission, reoperation, or emergency department visits at 30 or 90 days. Overlap did not predict higher rates of death over follow-up. Beginning/end overlap had results similar to any overlap.

CONCLUSIONS

Nonconcurrent, overlapping surgery is not associated with an increase in adverse outcomes in a large, matched cardiac surgery population.