The phenotypic landscape of essential human genes.

Understanding the basis for cellular growth, proliferation, and function requires determining the roles of essential genes in diverse cellular processes, including visualizing their contributions to cellular organization and morphology. Here, we combined pooled CRISPR-Cas9-based functional screening of 5,072 fitness-conferring genes in human HeLa cells with microscopy-based imaging of DNA, the DNA damage response, actin, and microtubules. Analysis of >31 million individual cells identified measurable phenotypes for >90% of gene knockouts, implicating gene targets in specific cellular processes. Clustering of phenotypic similarities based on hundreds of quantitative parameters further revealed co-functional genes across diverse cellular activities, providing predictions for gene functions and associations. By conducting pooled live-cell screening of ∼450,000 cell division events for 239 genes, we additionally identified diverse genes with functional contributions to chromosome segregation. Our work establishes a resource detailing the consequences of disrupting core cellular processes that represents the functional landscape of essential human genes.

Adverse event comparison between glucagon-like peptide-1 receptor agonists and other antiobesity medications following bariatric surgery.

AIM: To compare the incidence of adverse events (AEs) related to antiobesity medications (AOMs; glucagon-like peptide-1 receptor agonists [GLP-1RAs] vs. non-GLP-1RAs) after bariatric surgery. METHODS: This single-centre retrospective cohort included patients (aged 16-65 years) who had undergone laparoscopic Roux-en-Y gastric bypass or sleeve gastrectomy (cohort entry date) and initiated AOMs. Participants were categorized as users of US Food and Drug Administration (FDA)-approved, off-label, or GLP-1RA AOMs if documented as receiving the medication on or after cohort entry date. Non-GLP-1RA AOMs were phentermine, orlistat, topiramate, canagliflozin, dapagliflozin, empagliflozin, naltrexone, bupropion/naltrexone and phentermine/topiramate. GLP-1RA AOMs included: semaglutide, dulaglutide, exenatide and liraglutide. The primary outcome was AE incidence. Logistic regression was used to determine the association of AOM exposure with AEs. RESULTS: We identified 599 patients meeting our inclusion criteria, 83% of whom were female. Their median (interquartile range [IQR]) age was 47.8 (40.9-55.4) years. The median duration of surgery to AOM exposure was 30 months. GLP-1RAs use was not associated with higher odds of AEs: adjusted odds ratio (aOR) 1.1 (95% confidence interval [CI] 0.5-2.6) and aOR 1.1 (95% CI 0.6-2.3) for GLP-1RA versus FDA-approved and off-label AOM use, respectively. AOM initiation ≥12 months after surgery was associated with lower risk of AEs compared to <12 months (aOR 0.01 [95% CI 0.0-0.01]; p < 0.001). CONCLUSION: Our results showed that GLP-1RA AOMs were not associated with an increased risk of AEs compared to non-GLP-1RA AOMs in patients who had previously undergone bariatric surgery. Prospective studies are needed to identify the optimal timeframe for GLP-1RA initiation.

Exploring Social Support Dynamics After Bariatric Surgery: Insights From Patients and Providers.

INTRODUCTION: Weight loss after bariatric surgery is impacted by several factors, and social support is one of them. Our objective was to characterize patient and provider perceptions about social support after bariatric surgery. METHODS: We reported a secondary analysis of qualitative data acquired from semi-structured interviews conducted from January-November 2020 with bariatric surgery patients and providers. Participants included primary care providers, health psychologists, registered dietitians, bariatric surgeons, and patients with at least 1 y of follow-up after their bariatric procedure. Interview guides were designed using a hybrid of Andersen's Behavioral Model of Health Services and Torain's Framework for Surgical Disparities. Using directed content analysis, study team members generated codes, which were categorized into themes about social support pertaining to dietary habits, physical activity, and follow-up care. RESULTS: Forty-five participants were interviewed, including 24 patients (83% female; 79% White; mean age 50.6 ± 10.7 y) and 21 providers (six primary care providers, four health psychologists, five registered dieticians, and six bariatric surgeons). We identified four themes relating to social support affecting weight loss after surgery: (1) family involvement in helping patients adjust to the bariatric diet, (2) engagement in activities with partners/friends, (3) help with transportation to appointments, and (4) life stressors experienced by patients within their social relationships. CONCLUSIONS: Continued assessment of interpersonal factors after bariatric surgery is essential for weight loss maintenance. Providers can contribute by reinforcing the facilitators of social support and making referrals that may help patients overcome barriers to social support for sustained weight loss after surgery.

Impact of COVID-19 on the Postoperative Bariatric Surgery Patient Experience.

OBJECTIVE: To characterize patient and provider perceptions of the impact of coronavirus disease 2019 (COVID-19) on weight loss following bariatric surgery. BACKGROUND: COVID-19 has disrupted routines and healthcare throughout the United States, but its impact on bariatric surgery patients' postoperative experience is unknown. METHODS: Semistructured interviews with bariatric surgery patients, primary care providers, and health psychologists were conducted from April to November 2020. As part of a secondary analysis, patients and providers described how the COVID-19 pandemic affected the postoperative experience within 3 domains: dietary habits, physical activity, and follow-up care. Interview guides were created from 2 conceptual models: Torain's Surgical Disparities Model and Andersen's Behavioral Model of Health Services Use. Study team members derived codes, which were grouped into themes using conventional content analysis. RESULTS: Thirty-four participants were interviewed: 24 patients (12 Roux-en-Y gastric bypass and 12 sleeve gastrectomy), 6 primary care providers, and 4 health psychologists. Patients were predominately female (83%) and White (79%). Providers were predominately female (90%) and White (100%). COVID-19 affected the postoperative bariatric surgery patient experience via 3 mechanisms: (1) it disrupted dietary and physical activity routines due to facility closures and fear of COVID-19 exposure; (2) it required patients to transition their follow-up care to telemedicine delivery; and (3) it increased stress due to financial and psychosocial challenges. CONCLUSIONS: COVID-19 has exacerbated patient vulnerability. The pandemic is not over, thus bariatric surgery patients need ongoing support to access mental health professionals, develop new physical activity routines, and counteract increased food insecurity.

A Review and Assessment of Open Access Surgery Journals.

INTRODUCTION: Open access publishing has exhibited rapid growth in recent years. However, there is uncertainty surrounding the quality of open access journals and their ability to reach target audiences. This study reviews and characterizes open access surgical journals. MATERIALS AND METHODS: The directory of open access journals was used to search for open access surgical journals. PubMed indexing status, impact factor, article processing charge (APC), initial year of open access publishing, average weeks from manuscript submission to publication, publisher, and peer-review processes were evaluated. RESULTS: Ninety-two open access surgical journals were identified. Most (n = 49, 53.3%) were indexed in PubMed. Journals established >10 y were more likely to be indexed in PubMed compared to journals established <5 y (28 of 41 [68.3%] versus 4 of 20 [20%], P < 0.001). 44 journals (47.8%) used a double-blind review method. 49 (53.2%) journals received an impact factor for 2021, ranging from <0.1 to 10.2 (median 1.4). The median APC was $362 United States dollar [interquartile range $0 - 1802 United States dollar]. 35 journals (38%) did not charge a processing fee. There was a significant positive correlation between the APC and impact factor (r = 0.61, P < 0.001). If accepted, the median time from manuscript submission to publication was 12 wk. CONCLUSIONS: Open access surgical journals are largely indexed on PubMed, have transparent review processes, employ variable APCs (including no publication fees), and proceed efficiently from submission to publication. These results should increase readers' confidence in the quality of surgical literature published in open access journals.

Identifying Young Adults at High Risk for Weight Gain Using Machine Learning.

INTRODUCTION: Weight gain among young adults continues to increase. Identifying adults at high risk for weight gain and intervening before they gain weight could have a major public health impact. Our objective was to develop and test electronic health record-based machine learning models to predict weight gain in young adults with overweight/class 1 obesity. METHODS: Seven machine learning models were assessed, including three regression models, random forest, single-layer neural network, gradient-boosted decision trees, and support vector machine (SVM) models. Four categories of predictors were included: 1) demographics; 2) obesity-related health conditions; 3) laboratory data and vital signs; and 4) neighborhood-level variables. The cohort was split 60:40 for model training and validation. Area under the receiver operating characteristic curves (AUC) were calculated to determine model accuracy at predicting high-risk individuals, defined by ≥ 10% total body weight gain within 2 y. Variable importance was measured via generalized analysis of variance procedures. RESULTS: Of the 24,183 patients (mean [SD] age, 32.0 [6.3] y; 55.1% females) in the study, 14.2% gained ≥10% total body weight. Area under the receiver operating characteristic curves varied from 0.557 (SVM) to 0.675 (gradient-boosted decision trees). Age, sex, and baseline body mass index were the most important predictors among the models except SVM and neural network. CONCLUSIONS: Our machine learning models performed similarly and had modest accuracy for identifying young adults at risk of weight gain. Future models may need to incorporate behavioral and/or genetic information to enhance model accuracy.

Emerging From the Pandemic: How Has Academic Surgery Changed?

Academic surgery has changed along with the rest of the world in response to the COVID pandemic. With increasing rates of vaccination against COVID over the past 2 y, we have slowly but steadily made progress toward controlling the spread of the virus. Surgeons, academic surgery departments, health systems, and trainees are all attempting to establish a new normal in various domains-clinical, research, teaching, and in their personal lives. How has the pandemic changed these areas? At the 2022 Academic Surgical Congress Hot Topics session, we attempted to address these issues.

Patient and Provider Perceptions About Communication After Bariatric Surgery: A Qualitative Analysis.

INTRODUCTION: Communication between patients and providers can strongly influence patient behavior after surgery. The objective of this study was to assess patient and provider perceptions of how communication affected weight-related behaviors after bariatric surgery. MATERIALS AND METHODS: Semistructured interviews with bariatric surgery patients and providers were conducted from April-November 2020. Patients who had Medicaid within 3 y of surgery were defined as socioeconomically disadvantaged. Interview guides were derived from Andersen's Behavioral Model of Health Services and Torain's Framework for Surgical Disparities. Participants described postoperative experiences regarding diet, physical activity, and follow-up care. A codebook was developed deductively based on the two theories. Directed content analysis identified themes pertaining to patient-provider communication. RESULTS: Forty-five participants were interviewed, including 24 patients (83% female; 79% White), six primary care providers, four health psychologists, five registered dietitians, and six bariatric surgeons. Four themes regarding communication emerged: (1) Patients experiencing weight regain did not want to follow-up with providers to discuss their weight; (2) Patients from socioeconomically disadvantaged backgrounds had less trust and required more rapport-building from providers to enhance trust; (3) Patients felt that providers did not get to know them personally, which was perceived as a lack of personalized communication; and (4) Providers often changed their language to be simpler, so patients could understand them. CONCLUSIONS: Patient-provider communication after bariatric surgery is essential, but perceptions about the elements of communication differ between patients and providers. Reassuring patients who have attained less weight loss than expected and establishing trust with socioeconomically vulnerable patients could strengthen care after bariatric surgery.

Recurrent dysphagia after myotomy for achalasia: pneumatic dilation or POEM? : Which modality offers superior outcomes?

INTRODUCTION: Myotomy is the gold standard treatment for achalasia, yet long-term failure rates approach 15%. Treatment options for recurrent dysphagia include pneumatic dilation (PD), laparoscopic redo myotomy, per oral endoscopic myotomy (POEM), or esophagectomy. We employ both PD and POEM as first-line treatment for these patients. We evaluated operative success and patient reported outcomes for patients who underwent PD or POEM for recurrent dysphagia after myotomy. METHODS: We identified patients with achalasia who underwent PD or POEM for recurrent dysphagia after previous myotomy within a foregut database at our institution between 2013 and 2021. Gastroesophageal Reflux Disease-Health-Related quality of Life (GERD-HRQL) and Eckardt scores, and overall change in each were compared across PD and POEM groups. Successful treatment of dysphagia was defined by Eckardt scores ≤ 3. RESULTS: 103 patients underwent myotomy for achalasia. Of these, 19 (18%) had either PD or POEM for recurrent dysphagia. Nine were treated with PD and 10 with POEM. The mean change in Eckardt and GERD-HRQL scores did not differ between groups. 50% of the PD group and 67% of the POEM group had resolution of their dysphagia symptoms (p = 0.65). Mean procedure length was greater in the POEM group (267 vs 72 min, p < 0.01) as was mean length of stay (1.56 vs 0.3 days, p < 0.01). There was one adverse event after PD and three adverse events after POEM. After PD, 7 patients (70%) required additional procedures compared to four patients (44%) in the POEM group, consisting mostly of repeat PD. CONCLUSION: Patients undergoing PD or POEM for recurrent dysphagia after myotomy have similar rates of dysphagia resolution and reflux symptoms. Patients undergoing PD enjoy a shorter length of stay and shorter procedure time but may require more subsequent procedures.

A Qualitative Study of the System-level Barriers to Bariatric Surgery Within the Veterans Health Administration.

OBJECTIVE: To characterize system-level barriers to bariatric surgery from the perspectives of Veterans with severe obesity and obesity care providers. SUMMARY OF BACKGROUND DATA: Bariatric surgery is the most effective weight loss option for Veterans with severe obesity, but fewer than 0.1% of Veterans with severe obesity undergo it. Addressing low utilization of bariatric surgery and weight management services is a priority for the veterans health administration. METHODS: We conducted semi-structured interviews with Veterans with severe obesity who were referred for or underwent bariatric surgery, and providers who delivered care to veterans with severe obesity, including bariatric surgeons, primary care providers, registered dietitians, and health psychologists. We asked study participants to describe their experiences with the bariatric surgery delivery process in the VA system. All interviews were audio-recorded and transcribed. Four coders iteratively developed a codebook and used conventional content analysis to identify relevant systems or "contextual" barriers within Andersen Behavioral Model of Health Services Use. RESULTS: Seventy-three semi-structured interviews with veterans (n = 33) and providers (n = 40) throughout the veterans health administration system were completed. More than three-fourths of Veterans were male, whereas nearly three-fourths of the providers were female. Eight themes were mapped onto Andersen model as barriers to bariatric surgery: poor care coordination, lack of bariatric surgery guidelines, limited primary care providers and referring provider knowledge about bariatric surgery, long travel distances, delayed referrals, limited access to healthy foods, difficulties meetings preoperative requirements, and lack of provider availability and/or time. CONCLUSIONS: Addressing system-level barriers by improving coordination of care and standardizing some aspects of bariatric surgery care may improve access to evidence-based severe obesity care within VA.

Obesity and "obesity-related" cancers: are there body mass index cut-points?

BACKGROUND: Despite compelling links between excess body weight and cancer, body mass index (BMI) cut-points, or thresholds above which cancer incidence increased, have not been identified. The objective of this study was to determine if BMI cut-points exist for 14 obesity-related cancers. SUBJECTS/METHODS: In this retrospective cohort study, patients 18-75 years old were included if they had ≥2 clinical encounters with BMI measurements in the electronic health record (EHR) at a single academic medical center from 2008 to 2018. Patients who were pregnant, had a history of cancer, or had undergone bariatric surgery were excluded. Adjusted logistic regression was performed to identify cancers that were associated with increasing BMI. For those cancers, BMI cut-points were calculated using adjusted quantile regression for cancer incidence at 80% sensitivity. Logistic and quantile regression models were adjusted for age, sex, race/ethnicity, and smoking status. RESULTS: A total of 7079 cancer patients (mean age 58.5 years, mean BMI 30.5 kg/m2) and 270,441 non-cancer patients (mean age 43.8 years, mean BMI 28.8 kg/m2) were included in the study. In adjusted logistic regression analyses, statistically significant associations were identified between increasing BMI and the incidence of kidney, thyroid, and uterine cancer. BMI cut-points were identified for kidney (26.3 kg/m2) and uterine (26.9 kg/m2) cancer. CONCLUSIONS: BMI cut-points that accurately predicted development kidney and uterine cancer occurred in the overweight category. Analysis of multi-institutional EHR data may help determine if these relationships are generalizable to other health care settings. If they are, incorporation of BMI into the screening algorithms for these cancers may be warranted.

The 2020 Pandemics: Lessons Learned in Academic Surgery and Beyond.

2020 was a significant year because of the occurrence of two simultaneous public health crises: the coronavirus pandemic and the public health crisis of racism brought into the spotlight by the murder of George Floyd. The coronavirus pandemic has affected all aspects of health care, particularly the delivery of surgical care, surgical education, and academic productivity. The concomitant public health crisis of racism and health inequality during the viral pandemic highlighted opportunities for action to address gaps in surgical care and the delivery of public health services. At the 2021 Academic Surgical Congress Hot Topics session on flexibility and leadership, we also explored how our military surgeon colleagues can provide guidance in leadership during times of crisis. The following is a summary of the issues discussed during the session and reflections on the important lessons learned in academic surgery over the past year.

Antireflux surgery leads to durable improvement in laryngopharyngeal reflux symptoms.

BACKGROUND: Laryngopharyngeal reflux (LPR) symptoms are often present in patients with Gastroesophageal reflux disease (GERD). Whereas antireflux surgery (ARS) provides predictably excellent results in patients with typical GERD, those with atypical symptoms have variable outcomes. The goal of this study was to characterize the response of LPR symptoms to antireflux surgery. METHODS: Patients who underwent ARS between January 2009 and May 2020 were prospectively identified from a single institutional database. Patient-reported information on LPR symptoms was collected at standardized time points (preoperative and 2 weeks, 8 weeks, and 1 year postoperatively) using a validated Reflux Symptom Index (RSI) questionnaire. Patients were grouped by preoperative RSI score: ≤ 13 (normal) and > 13 (abnormal). Baseline characteristics were compared between groups using chi-square test or t-test. A mixed effects model was used to evaluate improvement in RSI scores. RESULTS: One hundred and seventy-six patients fulfilled inclusion criteria (mean age 57.8 years, 70% female, mean BMI 29.4). Patients with a preoperative RSI ≤ 13 (n = 61) and RSI > 13 (n = 115) were similar in age, BMI, primary reason for evaluation, DeMeester score, presence of esophagitis, and hiatal hernia (p > 0.05). The RSI > 13 group had more female patients (80 vs 52%, p = < 0.001), higher mean GERD-HRQL score, lower rates of PPI use, and normal esophageal motility. The RSI of all patients improved from a mean preoperative value of 19.2 to 7.8 (2 weeks), 6.1 (8 weeks), and 10.9 (1 year). Those with the highest preoperative scores (RSI > 30) had the best response to ARS. When analyzing individual symptoms, the most likely to improve included heartburn, hoarseness, and choking. CONCLUSIONS: In our study population, patients with LPR symptoms achieved a rapid and durable response to antireflux surgery. Those with higher preoperative RSI scores experienced the greatest improvement. Our data suggest that antireflux surgery is a viable treatment option for this patient population.

Both gastric electrical stimulation and pyloric surgery offer long-term symptom improvement in patients with gastroparesis.

BACKGROUND: Gastroparesis (GP) is hallmarked by nausea, vomiting, and early satiety. While dietary and medical therapy are the mainstay of treatment, surgery has been used to palliate symptoms. Two established first-line surgical options are gastric electrostimulation (GES) and pyloric procedures (PP) including pyloroplasty or pyloromyotomy. We sought to compare these modalities' improvement in Gastroparesis cardinal symptom index (GCSI) subscores and potential predictors of therapy failure. METHODS: All patients undergoing surgery at a single institution were prospectively identified and separated by surgery: GES, PP, or combined GESPP. GCSI was collected preoperatively, at 6 weeks and 1 year. Postoperative GCSI score over 2.5 or receipt of another gastroparesis operation were considered treatment failures. Groups were compared using Pearson's chi-squared and Kruskal-Wallis one-way ANOVA. RESULTS: Eighty-two patients were included: 18 GES, 51 PP, and 13 GESPP. Mean age was 44, BMI was 26.7, and 80% were female. Preoperative GCSI was 3.7. The PP group was older with more postsurgical gastroparesis. More patients with diabetes underwent GESPP. Preoperative symptom scores and gastric emptying were similar among all groups. All surgical therapies resulted in a significantly improved GCSI and nausea/vomiting subscore at 6 weeks and 1 year. Bloating improved initially, but relapsed in the GES and GESPP group. Satiety improved initially, but relapsed in the PP group. Fifty-nine (72%) had surgical success. Ten underwent additional surgery (7 crossed into the GESPP group, 3 underwent gastric resection). Treatment failures had higher preoperative GCSI, bloating, and satiety scores. Treatment failures and successes had similar preoperative gastric emptying. CONCLUSIONS: Both gastric electrical stimulation and pyloric surgery are successful gastroparesis treatments, with durable improvement in nausea and vomiting. Choice of operation should be guided by patient characteristics and discussion of surgical risks and benefits. Combination GESPP does not appear to confer an advantage over GES or PP alone.

Phone follow-up after inguinal hernia repair.

BACKGROUND: Typically, in-person follow-up in clinic is utilized after outpatient inguinal hernia repair. Studies have shown that phone follow-up may be successfully used for the detection of postoperative hernia recurrences. However, no studies have evaluated the detection rates of other postoperative complications, such as emergency department visits and readmissions, with the utilization of phone follow-up after inguinal hernia repair. The objective of our study was to investigate the safety of a phone follow-up care pathway following elective, outpatient inguinal hernia repair. METHODS: In this retrospective cohort study, adult patients who underwent elective, outpatient inguinal hernia repair between 2013 and 2019 at a large academic health system in the Midwest United States were identified from the electronic health record. Patients were categorized by type of postoperative follow-up: in-person or phone follow-up. Baseline demographics, operative, and postoperative data were compared between follow-up groups. Multivariable logistic regression was performed to investigate predictors of having any related emergency department (ED) visit/readmission/reoperation within 90 days. RESULTS: We included 2009 patients who underwent elective inguinal hernia repair during the study period. 321 patients had in-person follow-up only, while 1,688 patients had phone follow-up. There was a higher rate of laparoscopic repair in the phone follow-up group (85.4% vs. 53.0% for in-person follow-up). There were no differences in rates of related 90-day ED visits, readmissions, and reoperations between the phone and in-person follow-up groups. On multivariable logistic regression, receipt of phone follow-up was not a predictor of having 90-day ED visits, readmissions, or reoperations (OR 1.30, 95% CI [0.83, 2.05]). CONCLUSIONS: Patients who underwent phone follow-up had similarly low rates of adverse outcomes to those with in-person follow-up. Phone follow-up protocols may be implemented as an alternative for patients and provide a means to decrease healthcare utilization following inguinal hernia repair.

Unnecessary use of radiology studies in the diagnosis of inguinal hernias: a retrospective cohort study.

BACKGROUND: The diagnosis of inguinal hernias is predominantly based on physical exam, although imaging may be used in select cases. The objective of this study was to determine the frequency of unnecessary imaging used in the diagnosis of inguinal hernias. METHODS: Patients who underwent elective inguinal hernia repair at a large academic health system in the U.S. from 2010 to 2017 were included. Within this cohort, we identified patients who received imaging 6 months prior to surgery. Through chart review of physical exam findings and imaging indications, we categorized patients into four imaging categories: unrelated, necessary, unnecessary, and borderline. Multivariable logistic regression analysis was used to identify factors associated with receipt of unnecessary imaging. RESULTS: Of 2162 patients who underwent inguinal hernia surgery, 249 patients had related imaging studies 6 months prior to surgery. 47.0% of patients received unnecessary imaging. 66.9% and 33.1% of unnecessary studies were ultrasounds and CT scans, respectively. 24.5% of patients had necessary studies, while 28.5% had studies with borderline indications. On multivariable analysis, having a BMI between 25.0 and 29.9 kg/m2 was associated with receipt of unnecessary studies. Primary care providers and ED physicians were more likely to order unnecessary imaging. CONCLUSIONS: Nearly 50% of all patients who receive any related imaging prior to surgery had potentially unnecessary diagnostic radiology studies. This not only exposes patients to avoidable risks, but also places a significant economic burden on patients and our already-strained health system.

Obesity and BMI Cut Points for Associated Comorbidities: Electronic Health Record Study.

BACKGROUND: Studies have found associations between increasing BMIs and the development of various chronic health conditions. The BMI cut points, or thresholds beyond which comorbidity incidence can be accurately detected, are unknown. OBJECTIVE: The aim of this study is to identify whether BMI cut points exist for 11 obesity-related comorbidities. METHODS: US adults aged 18-75 years who had ≥3 health care visits at an academic medical center from 2008 to 2016 were identified from eHealth records. Pregnant patients, patients with cancer, and patients who had undergone bariatric surgery were excluded. Quantile regression, with BMI as the outcome, was used to evaluate the associations between BMI and disease incidence. A comorbidity was determined to have a cut point if the area under the receiver operating curve was >0.6. The cut point was defined as the BMI value that maximized the Youden index. RESULTS: We included 243,332 patients in the study cohort. The mean age and BMI were 46.8 (SD 15.3) years and 29.1 kg/m2, respectively. We found statistically significant associations between increasing BMIs and the incidence of all comorbidities except anxiety and cerebrovascular disease. Cut points were identified for hyperlipidemia (27.1 kg/m2), coronary artery disease (27.7 kg/m2), hypertension (28.4 kg/m2), osteoarthritis (28.7 kg/m2), obstructive sleep apnea (30.1 kg/m2), and type 2 diabetes (30.9 kg/m2). CONCLUSIONS: The BMI cut points that accurately predicted the risks of developing 6 obesity-related comorbidities occurred when patients were overweight or barely met the criteria for class 1 obesity. Further studies using national, longitudinal data are needed to determine whether screening guidelines for appropriate comorbidities may need to be revised.

Weight Loss for Patients With Obesity: An Analysis of Long-Term Electronic Health Record Data.

BACKGROUND: Numerous studies have reported that losing as little as 5% of one's total body weight (TBW) can improve health, but no studies have used electronic health record data to examine long-term changes in weight, particularly for adults with severe obesity [body mass index (BMI) ≥35 kg/m]. OBJECTIVE: To measure long-term weight changes and examine their predictors for adults in a large academic health care system. RESEARCH DESIGN: Observational study. SUBJECTS: We included 59,816 patients aged 18-70 years who had at least 2 BMI measurements 5 years apart. Patients who were underweight, pregnant, diagnosed with cancer, or had undergone bariatric surgery were excluded. MEASURES: Over a 5-year period: (1) ≥5% TBW loss; (2) weight loss into a nonobese BMI category (BMI <30 kg/m); and (3) predictors of %TBW change via quantile regression. RESULTS: Of those with class 2 or 3 obesity, 24.2% and 27.8%, respectively, lost at least 5% TBW. Only 3.2% and 0.2% of patients with class 2 and 3 obesity, respectively, lost enough weight to attain a BMI <30 kg/m. In quantile regression, the median weight change for the population was a net gain of 2.5% TBW. CONCLUSIONS: Although adults with severe obesity were more likely to lose at least 5% TBW compared with overweight patients and patients with class 1 obesity, sufficient weight loss to attain a nonobese weight class was very uncommon. The pattern of ongoing weight gain found in our study population requires solutions at societal and health systems levels.

Prospective comparison of longitudinal change in hepatic proton density fat fraction (PDFF) estimated by magnitude-based MRI (MRI-M) and complex-based MRI (MRI-C).

PURPOSE: To compare longitudinal hepatic proton density fat fraction (PDFF) changes estimated by magnitude- vs. complex-based chemical-shift-encoded MRI during a weight loss surgery (WLS) program in severely obese adults with biopsy-proven nonalcoholic fatty liver disease (NAFLD). METHODS: This was a secondary analysis of a prospective dual-center longitudinal study of 54 adults (44 women; mean age 52 years; range 27-70 years) with obesity, biopsy-proven NAFLD, and baseline PDFF ≥ 5%, enrolled in a WLS program. PDFF was estimated by confounder-corrected chemical-shift-encoded MRI using magnitude (MRI-M)- and complex (MRI-C)-based techniques at baseline (visit 1), after a 2- to 4-week very low-calorie diet (visit 2), and at 1, 3, and 6 months (visits 3 to 5) after surgery. At each visit, PDFF values estimated by MRI-M and MRI-C were compared by a paired t test. Rates of PDFF change estimated by MRI-M and MRI-C for visits 1 to 3, and for visits 3 to 5 were assessed by Bland-Altman analysis and intraclass correlation coefficients (ICCs). RESULTS: MRI-M PDFF estimates were lower by 0.5-0.7% compared with those of MRI-C at all visits (p < 0.001). There was high agreement and no difference between PDFF change rates estimated by MRI-M vs. MRI-C for visits 1 to 3 (ICC 0.983, 95% CI 0.971, 0.99; bias = - 0.13%, p = 0.22), or visits 3 to 5 (ICC 0.956, 95% CI 0.919-0.977%; bias = 0.03%, p = 0.36). CONCLUSION: Although MRI-M underestimates PDFF compared with MRI-C cross-sectionally, this bias is consistent and MRI-M and MRI-C agree in estimating the rate of hepatic PDFF change longitudinally. KEY POINTS: • MRI-M demonstrates a significant but small and consistent bias (0.5-0.7%; p < 0.001) towards underestimation of PDFF compared with MRI-C at 3 T. • Rates of PDFF change estimated by MRI-M and MRI-C agree closely (ICC 0.96-0.98) in adults with severe obesity and biopsy- proven NAFLD enrolled in a weight loss surgery program. • Our findings support the use of either MRI technique (MRI-M or MRI-C) for clinical care or by individual sites or for multi-center trials that include PDFF change as an endpoint. However, since there is a bias in their measurements, the same technique should be used in any given patient for longitudinal follow-up.

Healthcare spending and utilization following antireflux surgery: examining costs and reasons for readmission.

BACKGROUND: While clinical outcomes have been reported for anti-reflux surgery (ARS), there are limited data on post-operative encounters, including readmission, and their associated costs. This study evaluates healthcare utilization during the 90-day post-operative period following ARS including fundoplication and/or paraesophageal hernia (PEH) repair. METHODS: Data were analyzed from the Truven Health MarketScan® Databases. Patients older than 16 years with an ICD-9 procedure code or Common Procedural Terminology (CPT) code for ARS and a primary diagnosis of GERD during 2012-2014 were selected. Healthcare spending and utilization on emergency department (ED) visits, performance of outpatient endoscopy, and readmission were examined. Reasons for readmission were classified based on ICD-9 code. RESULTS: A total of 40,853 patients were included in the cohort with a mean age of 49 years and females comprising 76.0%. Mean length of stay was 1.4 days, and 93.0% of patients underwent a laparoscopic approach. The mean cost of the index surgical admission was $24,034. Readmission occurred in 4.2% of patients, and of those, 26.3% required a surgical intervention. Patients requiring one or more related readmissions accrued additional costs of $29,513. Some of the most common reasons for readmission were related to nutritional, metabolic, and fluid and electrolyte disorders. Presentation to the ED occurred in 14.0% of patients, and outpatient upper endoscopy was required in 1.5% of patients, but with much lower associated costs as compared to readmission ($1175). CONCLUSION: The majority of patients undergoing ARS do not require additional care within 90 days of surgery. Patients who are readmitted accrue costs that almost double the overall cost of care compared to the initial hospitalization. Measures to attenuate potentially preventable readmissions after ARS may reduce healthcare utilization in this patient population.