Evaluation of basic life support interventions for foreign body airway obstructions: A population-based cohort study.

AIM: To quantify the associations of foreign body airway obstruction (FBAO) basic life support (BLS) interventions with FBAO relief and survival to discharge. METHODS: We identified prehospital FBAO patient encounters in Alberta, Canada between Jan 1, 2018 and Dec 31,2021 using the provincial emergency medical services' medical records, deterministically linked to hospital data. Two physicians reviewed encounters to determine cases and extract data. Multivariable logistic regression determined the adjusted odds ratio of FBAO relief (primary outcome) and survival to discharge for the exposure of BLS interventions (abdominal thrusts [AT], chest compressions/thrusts [CC], or combinations) relative to back blows [BB]. Intervention-associated injuries were identified using International Classification of Diseases codes, followed by health records review. RESULTS: We identified 3,677 patient encounters, including 709 FBAOs requiring intervention. Bystanders performed the initial BLS intervention in 488 cases (77.4%). Bystanders and paramedics did not relieve the FBAO in 151 (23.5%) and 11 (16.7%) cases, respectively. FBAOs not relieved before paramedic arrival had a higher proportion of deaths (n = 4[0.4%] versus n = 92[42.4%], p < 0.001). AT and CC were associated with decreased odds of FBAO relief relative to BB (adjusted odds ratio [aOR] 0.49 [95%CI 0.30-0.80] and 0.14 [95%CI 0.07-0.28], respectively). CC were associated with decreased odds of survival to discharge (aOR 0.04 [95%CI 0.01-0.32]). AT, CC, and BB were implicated in intervention-associated injuries in four, nine, and zero cases, respectively. CONCLUSIONS: Back blows are associated with improved outcomes compared to abdominal thrusts and chest compressions. These data can inform prospective studies aimed at improving response to choking emergencies.

Preferences of Patients With Chronic Kidney Disease for Invasive Versus Conservative Treatment of Acute Coronary Syndrome: A Discrete Choice Experiment.

Background Patients with chronic kidney disease (CKD) can experience acute coronary syndromes (ACS) with high morbidity and mortality. Early invasive management of ACS is recommended for most high-risk patients; however, choosing between an early invasive versus conservative management approach may be influenced by the unique risk of kidney failure for patients with CKD. Methods and Results This discrete choice experiment measured the preferences of patients with CKD for future cardiovascular events versus acute kidney injury and kidney failure following invasive heart procedures for ACS. The discrete choice experiment, consisting of 8 choice tasks, was administered to adult patients attending 2 CKD clinics in Calgary, Alberta. The part-worth utilities of each attribute were determined using multinomial logit models, and preference heterogeneity was explored using latent class analysis. A total of 140 patients completed the discrete choice experiment. The mean age of patients was 64 years, 52% were male, and mean estimated glomerular filtration rate was 37 mL/min per 1.73 m2. Across the range of levels, risk of mortality was the most important attribute, followed by risk of end-stage kidney disease and risk of recurrent myocardial infarction. Latent class analysis identified 2 distinct preference groups. The largest group included 115 (83%) patients, who placed the greatest value on treatment benefits and expressed the strongest preference for reducing mortality. A second group of 25 (17%) patients was identified who were procedure averse and had a strong preference toward conservative management of ACS and avoiding acute kidney injury requiring dialysis. Conclusions The preferences of most patients with CKD for management of ACS were most influenced by lowering mortality. However, a distinct subgroup of patients was strongly averse to invasive management. This highlights the importance of clarifying patient preferences to ensure treatment decisions are aligned with patient values.

Prediction of major postoperative events after non-cardiac surgery for people with kidney failure: derivation and internal validation of risk models.

BACKGROUND: People with kidney failure often require surgery and experience worse postoperative outcomes compared to the general population, but existing risk prediction tools have excluded those with kidney failure during development or exhibit poor performance. Our objective was to derive, internally validate, and estimate the clinical utility of risk prediction models for people with kidney failure undergoing non-cardiac surgery. DESIGN, SETTING, PARTICIPANTS, AND MEASURES: This study involved derivation and internal validation of prognostic risk prediction models using a retrospective, population-based cohort. We identified adults from Alberta, Canada with pre-existing kidney failure (estimated glomerular filtration rate [eGFR] < 15 mL/min/1.73m2 or receipt of maintenance dialysis) undergoing non-cardiac surgery between 2005-2019. Three nested prognostic risk prediction models were assembled using clinical and logistical rationale. Model 1 included age, sex, dialysis modality, surgery type and setting. Model 2 added comorbidities, and Model 3 added preoperative hemoglobin and albumin. Death or major cardiac events (acute myocardial infarction or nonfatal ventricular arrhythmia) within 30 days after surgery were modelled using logistic regression models. RESULTS: The development cohort included 38,541 surgeries, with 1,204 outcomes (after 3.1% of surgeries); 61% were performed in males, the median age was 64 years (interquartile range [IQR]: 53, 73), and 61% were receiving hemodialysis at the time of surgery. All three internally validated models performed well, with c-statistics ranging from 0.783 (95% Confidence Interval [CI]: 0.770, 0.797) for Model 1 to 0.818 (95%CI: 0.803, 0.826) for Model 3. Calibration slopes and intercepts were excellent for all models, though Models 2 and 3 demonstrated improvement in net reclassification. Decision curve analysis estimated that use of any model to guide perioperative interventions such as cardiac monitoring would result in potential net benefit over default strategies. CONCLUSIONS: We developed and internally validated three novel models to predict major clinical events for people with kidney failure having surgery. Models including comorbidities and laboratory variables showed improved accuracy of risk stratification and provided the greatest potential net benefit for guiding perioperative decisions. Once externally validated, these models may inform perioperative shared decision making and risk-guided strategies for this population.

Using the Revised Cardiac Risk Index to Predict Major Postoperative Events for People With Kidney Failure: An External Validation and Update.

Background: People with kidney failure have high risk of postoperative morbidity and mortality. Although the revised cardiac risk index (RCRI) is used to estimate the risk of major postoperative events, it has not been validated in this population. We aimed to externally validate the RCRI and determine whether updating the model improved predictions for people with kidney failure. Methods: We derived a retrospective, population-based cohort of adults with kidney failure (maintenance dialysis or sustained estimated glomerular filtration rate < 15 mL/min per 1.73 m2) who had surgery in Alberta, Canada between 2005 and 2019. We categorized participants based on RCRI variables and assigned risk estimates of death or major cardiac events, and then estimated predictive performance. We re-estimated the coefficients for each RCRI variable and internally validated the updated model. Net benefit was estimated with decision curve analysis. Results: After 38,541 surgeries, 1204 events (3.1%) occurred. The estimated C-statistic for the original RCRI was 0.64 (95% confidence interval: 0.62, 0.65). Examination of calibration revealed significant risk overestimation. In the re-estimated RCRI model, discrimination was marginally different (C-statistic 0.67 [95% confidence interval: 0.66, 0.69]), though calibration was improved. No net benefit was observed when the data were examined with decision curve analysis, whereas the original RCRI was associated with harm. Conclusions: The RCRI performed poorly in a Canadian kidney failure cohort and significantly overestimated risk, suggesting that RCRI use in similar kidney failure populations should be limited. A re-estimated kidney failure-specific RCRI may be promising but needs external validation. Novel perioperative models for this population are urgently needed.

Contexte: Les personnes atteintes d'insuffisance rénale présentent un risque élevé de mortalité et de morbidité postopératoires. L'indice de risque cardiaque révisé (IRCR) est utilisé pour estimer le risque d'événements postopératoires majeurs, mais il n'a pas été validé au sein de cette po-pulation. Nous avons cherché à réaliser une validation externe de l'IRCR et à déterminer si une modification du modèle pourrait permettre une meilleure valeur prédictive pour les patients atteints d'insuffisance rénale. Méthodologie: Nous avons étudié rétrospectivement une cohorte populationnelle d'adultes atteints d'insuffisance rénale (sous dialyse d'entretien ou avec un débit de filtration glomérulaire estimé < 15 ml/min/1,73 m2, de façon soutenue) ayant subi une intervention chirurgicale en Alberta (Canada) entre 2005 et 2019. Les participants ont été classifiés selon les variables de l'IRCR, et une estimation du risque de décès ou d'événement cardiovasculaire majeur leur a été attribuée; la performance prédictive a ensuite été évaluée. Nous avons réestimé les coefficients pour chacune des variables de l'IRCR et nous avons validé de manière interne le modèle modifié. Le bénéfice net a été estimé avec une analyse de la courbe décisionnelle. Résultats: Après 38 541 interventions chirurgicales, des événements cardiovasculaires sont survenus dans 1 204 cas (3,1 %). La statistique C estimée obtenue avec l'IRCR initial était de 0,64 (intervalle de confiance [IC] à 95 %, de 0,62 à 0,65). Un examen de la calibration de l'indice a révélé une surestimation significative du risque. Avec le modèle d'IRCR modifié, la discrimination présentait une légère différence (statistique C de 0,67 [IC à 95 %, de 0,66 à 0,69]), bien que la calibration ait été améliorée. Pour l'indice modifié, aucun bénéfice net n'a été observé lors de l'examen des données par une analyse décisionnelle, alors qu'un préjudice était associé à l'IRCR initial. Conclusions: L'IRCR s'est révélé peu concluant dans une cohorte populationnelle de patients canadiens atteints d'insuffisance rénale et il a significativement surestimé les risques pour ces patients, ce qui suggère que l'utilisation de l'IRCR dans des populations similaires atteintes d'insuffisance rénale devrait être limitée. Un IRCR réestimé, propre à la population des patients atteints d'insuffisance rénale, pourrait être prometteur, mais requiert une validation externe. De nouveaux modèles périopératoires sont indispensables pour cette population.

Reconstructive Surgeons as Essential Operative Consultants: Quantifying the True Value of Plastic Surgeons to an Academic Medical Center.

BACKGROUND: The revenue generated by plastic surgeons assisting other surgical services is poorly captured by hospital accounting systems, which categorize solely by attending physician of record. The financial impact of reconstructive surgery is thus systematically underestimated. The authors sought to quantify the overlooked value of plastic surgeons as consultants who facilitate complex and profitable operations. METHODS: Hospital billing data were reviewed for inpatient operations over a 3-year fiscal period (2015 to 2017). Cases in which a plastic surgeon assisted were identified. Case mix index, a measure of complexity that correlates with profit, and contribution margin, defined as revenue minus cost, were obtained for each case. RESULTS: Five hundred fifty-four cases required a reconstructive surgeon; 18,904 nonconsultation cases were identified for comparison. Average net revenue per case involving a consultation was 1.79 times greater than for control cases (p < 0.0001). Average contribution margin was 1.73 times greater (p < 0.005). The highest contribution margins stemmed from joint cases with cardiothoracic surgery and neurosurgery. Case mix index was significantly higher for consultation cases than for controls (4.5 versus 3.9; p < 0.0001). In 434 cases (78 percent), plastic surgery assisted with an integral aspect of the operation, meaning the surgery could not have been technically performed without reconstructive assistance. CONCLUSIONS: The authors' findings demonstrate that cases involving plastic surgeons have a higher profit margin than those performed by any department alone. However, this revenue is not appropriately attributed because of oversimplified financial metrics. The skill set of reconstructive surgeons is an undervalued resource for both patient care and hospital economics.

Derivation and External Validation of a Risk Index for Predicting Acute Kidney Injury Requiring Kidney Replacement Therapy After Noncardiac Surgery.

Importance: Severe acute kidney injury (AKI) is a serious postoperative complication. A tool for predicting the risk of AKI requiring kidney replacement therapy (KRT) after major noncardiac surgery might assist with patient counseling and targeted use of measures to reduce this risk. Objective: To derive and validate a predictive model for AKI requiring KRT after major noncardiac surgery. Design, Setting, and Participants: In this prognostic study, 5 risk prediction models were derived and internally validated in a population-based cohort of adults without preexisting kidney failure who underwent noncardiac surgery in Alberta, Canada, between January 1, 2004, and December 31, 2013. The best performing model and corresponding risk index were externally validated in a population-based cohort of adults without preexisting kidney failure who underwent noncardiac surgery in Ontario, Canada, between January 1, 2007, and December 31, 2017. Data analysis was conducted from September 1, 2019, to May 31, 2021. Exposures: Demographic characteristics, surgery type, laboratory measures, and comorbidities before surgery. Main Outcomes and Measures: Acute kidney injury requiring KRT within 14 days after surgery. Discrimination was assessed using the C statistic; calibration was assessed using calibration intercept and slope. Logistic recalibration was used to optimize model calibration in the external validation cohort. Results: The derivation cohort included 92 114 patients (52.2% female; mean [SD] age, 62.3 [18.0] years), and the external validation cohort included 709 086 patients (50.8% female; mean [SD] age, 61.0 [16.0] years). A total of 529 patients (0.6%) developed postoperative AKI requiring KRT in the derivation cohort, and 2956 (0.4%) developed postoperative AKI requiring KRT in the external validation cohort. The following factors were consistently associated with the risk of AKI requiring KRT: younger age (40-69 years: odds ratio [OR], 2.07 [95% CI, 1.69-2.53]; <40 years: OR, 3.73 [95% CI, 2.61-5.33]), male sex (OR, 1.55; 95% CI, 1.28-1.87), surgery type (colorectal: OR, 4.86 [95% CI, 3.28-7.18]; liver or pancreatic: OR, 6.46 [95% CI, 3.85-10.83]; other abdominal: OR, 2.19 [95% CI, 1.66-2.89]; abdominal aortic aneurysm repair: OR, 19.34 [95% CI, 14.31-26.14]; other vascular: OR, 7.30 [95% CI, 5.48-9.73]; thoracic: OR, 3.41 [95% CI, 2.07-5.59]), lower estimated glomerular filtration rate (OR, 0.97; 95% CI, 0.97-0.97 per 1 mL/min/1.73 m2 increase), lower hemoglobin concentration (OR, 0.99; 95% CI, 0.98-0.99 per 0.1 g/dL increase), albuminuria (mild: OR, 1.88 [95% CI, 1.52-2.33]; heavy: OR, 3.74 [95% CI, 2.98-4.69]), history of myocardial infarction (OR, 1.63; 95% CI, 1.32-2.03), and liver disease (mild: OR, 2.32 [95% CI, 1.66-3.24]; moderate or severe: OR, 4.96 [95% CI, 3.58-6.85]). In external validation, a final model including these variables showed excellent discrimination (C statistic, 0.95; 95% CI, 0.95-0.96), with sensitivity of 21.2%, specificity of 99.9%, positive predictive value of 38.1%, and negative predictive value of 99.7% at a predicted risk threshold of 10% or greater. Conclusions and Relevance: The findings suggest that this risk model can predict AKI requiring KRT after noncardiac surgery using routine preoperative data. The model may be feasible for implementation in clinical perioperative risk stratification for severe AKI.

Routine Prophylactic Endoscopic Clipping Is Not Efficacious in the Prevention of Delayed Post-Polypectomy Bleeding: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.

BACKGROUND AND AIMS: Colorectal cancer (CRC) can be prevented through colonoscopic polypectomy, but this exposes patients to risks, including delayed post-polypectomy bleeding (DPPB). Endoscopists increasingly use clips prophylactically with the aim of preventing DPPB. However, clips are costly, and data to support their efficacy in this context are inconsistent. We performed a systematic review and meta-analysis of randomized controlled trials to assess the efficacy of prophylactic clipping for preventing DPPB. METHODS: We searched electronic databases and other relevant sources for randomized controlled trials assessing the efficacy of prophylactic clipping versus no clipping for the prevention of DPPB. Pooled relative risks were determined using a fixed-effects model. Subgroup analyses were also performed. RESULTS: A total of 2305 citations were initially screened. Seven randomized controlled trials satisfied all criteria for inclusion. The quality of included studies was generally low to moderate. A total of 2851 patients underwent 5405 polypectomies. Delayed post-polypectomy bleeding occurred at an overall pooled rate of 2.5%. No overall benefit of clipping for preventing DPPB was observed, with a pooled relative risk of 0.86 (95% confidence interval [CI], 0.55 to 1.36). No significant patient or polyp factors predicting DPPB were found through subgroup analyses. No publication bias was identified. CONCLUSIONS: Randomized trials to date do not demonstrate a protective effect of prophylactic clipping for the prevention of DPPB, and therefore, the practice of routine prophylactic clipping appears unjustified. Additional high quality randomized trials are required to identify higher-risk groups that may benefit from prophylactic clipping.

The financial value of vascular surgeons as operative consultants to other surgical specialties.

OBJECTIVE: Vascular surgeons provide assistance to other surgical specialties through planned and unplanned joint operative cases. The financial impact to the hospital of vascular surgeons as consultants in this context has yet to be quantified. We sought to quantify the financial value of services provided by consulting vascular surgeons in the performance of joint operative procedures, both planned and unplanned. METHODS: Hospital financial data were reviewed for all inpatient operative cases during a 3-year period (2013-2015). Cases in which a vascular surgeon provided operative assistance as a consultant to a nonvascular surgeon were identified and designated planned or unplanned. Contribution margin, defined as hospital revenue minus variable cost, was determined for each case. In addition, the contribution margin ratio (contribution margin divided by revenue) was determined for each cohort. Financial data for consulting cases was compared with all nonconsult cases. Data analysis was performed with nonparametric statistics. RESULTS: There were 208 cases with a primary nonvascular surgeon that required a vascular co-surgeon during the study period, 169 planned and 39 unplanned. For comparison, 19,594 nonconsult cases of other surgical specialties were identified. The median contribution margin was higher for vascular surgery consult cases compared with nonconsult cases ($14,406 [interquartile range, $63,192] vs $5491 [interquartile range $28,590]; P = .002). The overall contribution margin ratio was higher for vascular surgery consult cases (0.41) compared with control nonconsult cases (0.35). There was no difference in contribution margin and contribution margin ratio between planned and unplanned vascular surgery consult cases. CONCLUSIONS: Vascular surgeons provide essential operative assistance to other surgical specialties. This operative assistance is frequent and provides significant financial value, with high contribution margin and contribution margin ratio. Vascular surgeons, as consulting surgeons, enable the completion of highly complex cases and in this capacity provide significant financial value to the hospital.

Long-term risk of cardiovascular mortality in lymphoma survivors: A systematic review and meta-analysis.

Cardiovascular disease has been identified as one of the late complications of cancer therapy. The purpose of this study was to quantify the long-term risk of cardiovascular mortality among lymphoma survivors relative to that of the general population. A systematic review and meta-analysis were conducted. Articles were identified in November 2016 by searching EMBASE, MEDLINE, and CINAHL databases. Observational studies were included if they assessed cardiovascular mortality in patients with lymphoma who survived for at least 5 years from time of diagnosis or if they had a median follow-up of 10 years. A pooled standardized mortality ratio (SMR) was estimated using a DerSimonian and Laird random-effects model. The Q and I2 statistics were used to assess heterogeneity. Funnel plots and Begg's and Egger's tests were used to evaluate publication bias. Of the 7450 articles screened, 27 studies were included in the systematic review representing 46 829 Hodgkin and 14 764 non-Hodgkin lymphoma survivors. The pooled number of deaths attributable to cardiovascular disease among Hodgkin and non-Hodgkin disease was estimated to be 7.31 (95% CI: 5.29-10.10; I2  = 95.4%) and 5.35 (95% CI: 2.55-11.24; I2  = 94.0%) times that of the general population, respectively. This association was greater among Hodgkin lymphoma survivors treated before the age of 21 (pooled SMR = 13.43; 95% CI: 9.22-19.57; I2  = 78.9%). There was a high degree of heterogeneity and a high risk of bias due to confounding in this body of literature. Lymphoma survivors have an increased risk of fatal cardiovascular events compared to the general population and should be targeted for cardiovascular screening and prevention campaigns.

Dose-dependent interferon-gamma release in dairy calves experimentally infected with Mycobacterium avium subspecies paratuberculosis.

The interferon-gamma (IFN-γ) release assay is considered useful for diagnosis of subclinical paratuberculosis. However, interpretation can be subjective and complex; therefore, additional information regarding the course of the cellular immune response and effects of age and dose at infection would be helpful. Thirty-three calves were randomly allocated to 10 challenge groups and a negative control group. Calves were inoculated orally at 2 weeks or at 3, 6, 9, or 12 months of age. Within each age group, calves received either a high or low dose of Mycobacterium avium subspecies paratuberculosis (MAP). Monthly blood samples were collected, stimulated with Purified Protein Derivative (PPD) Johnin in vitro, and the subsequent release of IFN-γ measured. Calves inoculated with a high dose had earlier and stronger IFN-γ responses than low-dose calves. Furthermore, calves inoculated at 2 weeks of age produced less IFN-γ compared to those inoculated later in life. The IFN-γ response peaked (on average) 4 months after exposure; therefore, this would be an optimal interval to test cattle for MAP-infection (although the timing of field-based infections is unknown and clearance of infection a possibility). To conclude, the IFN-γ release assay could be a valuable diagnostic test on herd-level to indicate exposure to MAP.