Association Between All-Cause Mortality and High-Sensitivity Cardiac Troponin Concentrations in Patients With Chest Pain.

We assessed the association between troponin levels and all-cause mortality in individuals with chest pain who presented to the Charleston Area Medical Center Emergency Department (CAMC). We identified adult patients with chest pain as defined in the International Classification of Diseases 10 (R07) family group from the CAMC data warehouse between June 6, 2020, and June 6, 2021. These cases required a visit to the emergency room. We created 3 different cohorts to assess the endpoints of all-cause mortality at 30 days and 6 months. Patients were divided into the following 3 categories: negative troponin level, defined as high sensitivity troponin I (HSTNI) assay ≤15 pg/mL for women and ≤20 pg/mL for men; weakly positive, 21-88 pg/mL for men and 16-88 pg/mL for women; and strongly positive, >88 pg/mL for men and women. A propensity score matching analysis was also conducted using the negative group as a control; the weakly and strongly positive groups were compared to the control across differing cardiology covariates. This study introduces novel cutoffs for high-sensitivity troponin I (Beckman Coulter assay, Beckman Coulter, Inc., Chaska Campus, 1000 Lake Hazeltine Drive, Chaska, Minnesota 55318).

Impact of TAVR on patients with severe aortic stenosis and liver cirrhosis.

We sought to assess the impact of transcatheter aortic valve replacement (TAVR) on patients that have both severe aortic stenosis (SAS) and liver cirrhosis on mortality at 365 days after index event. We identified 19,210 patients that met inclusion criteria using the TriNetX database, consisting of data from 58 large healthcare organizations collected between 1 January 2010 and 24 February 2022. Of those patients, 1,283 (3.2%) had SAS with liver cirrhosis that had a TAVR, and 19,210 (96.8%) had SAS with liver cirrhosis that did not have a TAVR. We analyzed the data to compare all-cause mortality at 365 days using the TriNetX web platform. In addition, we conducted propensity score matching (PSM) to reduce the effects of confounders between the two groups. Patients with SAS and liver cirrhosis that had a TAVR were older (72.4 ± 9.7 vs. 68.0 ± 11.8, P < 0.001), and they had higher rates of heart failure (71.2 vs. 34.5%, P < 0.001), coronary artery disease (72.0 vs. 31.2%, P < 0.001), diabetes (52.5 vs. 41.2%, P < 0.001), and chronic kidney disease (43.8 vs. 30.1%, P < 0.001) compared with patients with SAS and liver cirrhosis without TAVR. PSM created two well-matched cohorts of 1,269 patients each. The TAVR group had a lower mortality rate compared with the no TAVR group (22.5 vs. 34.8%, P < 0.0001) at 365 days. This was confirmed using a log-rank test. Given these data, it appears that there is a mortality benefit associated with TAVR in patients with SAS and liver cirrhosis.NEW & NOTEWORTHY Risk calculators used to predict unfavorable surgical outcomes could flag a patient as ineligible for transcatheter aortic valve replacement (TAVR) based on the presence of liver cirrhosis. Our data analysis suggests that performing a TAVR to treat severe aortic stenosis in patients with liver cirrhosis could decrease their mortality risk as opposed to not performing a TAVR. Careful consideration should be given to this patient population to ensure the best quality of life and long-term outcome.

Convolution Neural Network Algorithm for Shockable Arrhythmia Classification Within a Digitally Connected Automated External Defibrillator.

Background Diagnosis of shockable rhythms leading to defibrillation remains integral to improving out-of-hospital cardiac arrest outcomes. New machine learning techniques have emerged to diagnose arrhythmias on ECGs. In out-of-hospital cardiac arrest, an algorithm within an automated external defibrillator is the major determinant to deliver defibrillation. This study developed and validated the performance of a convolution neural network (CNN) to diagnose shockable arrhythmias within a novel, miniaturized automated external defibrillator. Methods and Results There were 26 464 single-lead ECGs that comprised the study data set. ECGs of 7-s duration were retrospectively adjudicated by 3 physician readers (N=18 total readers). After exclusions (N=1582), ECGs were divided into training (N=23 156), validation (N=721), and test data sets (N=1005). CNN performance to diagnose shockable and nonshockable rhythms was reported with area under the receiver operating characteristic curve analysis, F1, and sensitivity and specificity calculations. The duration for the CNN to output was reported with the algorithm running within the automated external defibrillator. Internal and external validation analyses included CNN performance among arrhythmias, often mistaken for shockable rhythms, and performance among ECGs modified with noise to mimic artifacts. The CNN algorithm achieved an area under the receiver operating characteristic curve of 0.995 (95% CI, 0.990-1.0), sensitivity of 98%, and specificity of 100% to diagnose shockable rhythms. The F1 scores were 0.990 and 0.995 for shockable and nonshockable rhythms, respectively. After input of a 7-s ECG, the CNN generated an output in 383±29 ms (total time of 7.383 s). The CNN outperformed adjudicators in classifying atrial arrhythmias as nonshockable (specificity of 99.3%-98.1%) and was robust against noise artifacts (area under the receiver operating characteristic curve range, 0.871-0.999). Conclusions We demonstrate high diagnostic performance of a CNN algorithm for shockable and nonshockable rhythm arrhythmia classifications within a digitally connected automated external defibrillator. Registration URL: https://clinicaltrials.gov/ct2/show/NCT03662802; Unique identifier: NCT03662802.

Association Between Myocarditis and Mortality in COVID-19 Patients in a Large Registry.

OBJECTIVE: To present a large registry data assessing the association between myocarditis and mortality in patients with severe acute respiratory syndrome coronavirus 2 infection. PATIENTS AND METHODS: The researchers identified adult patients aged 18 to 90 years of age with coronavirus disease 2019 (COVID-19) diagnosis in the TriNetX (COVID-19 research network) database between January 20, 2020, and December 9, 2020. These patients were then divided into groups of those who had a positive myocarditis diagnosis and those who did not. The researchers compared all-cause mortality between propensity-matched pairs of patients in both groups. RESULTS: A total of 259,352 patients with COVID-19 diagnosis were included in the study. Of those patients, 383 (0.2%) had myocarditis diagnosis, whereas 258,969 (99.8%) did not have myocarditis diagnosis during their hospital stay. Patients were predominantly male in the myocarditis group (59.0% vs 45.0%, P<0.001). As to the propensity-matched cohorts, 383 of 383 were matched, and the all-cause mortality was 13.4 % vs 4.2% (P<0.001) at 30 days. A Kaplan-Meier survival analysis was also statistically significant (P<0.001) at 30 days. CONCLUSION: In a large multinational database of COVID-19 patients, we observed an association between myocarditis diagnosis and increased mortality. Further prospective studies are recommended to further assess myocarditis outcomes in COVID-19 patients and treatment options.

Double-Valve Heart Disease and Glomerulonephritis Consequent to Abiotrophia defectiva Endocarditis.

Abiotrophia defectiva, a nutritionally deficient streptococcus, is a rare cause of infective endocarditis. It has been associated with hemophagocytic syndrome. We present the first case of A. defectiva infective endocarditis that led to antineutrophil cytoplasmic antibody-associated glomerulonephritis. The patient was a 55-year-old man whose endocarditis affected the mitral and aortic valves. His course was complicated by atrial fibrillation, stroke, and glomerulonephritis. He was successfully treated with antibiotics and dual valve replacement.

Coronary Artery Involvement in Segmental Arterial Mediolysis: A Case Report.

Segmental arterial mediolysis (SAM) is an increasingly recognized disorder affecting small- to medium-sized muscular arteries. A patient with SAM involving the visceral arteries who was also found to have multivessel coronary artery involvement is described. The patient underwent a battery of biochemical, imaging, and genetic tests to exclude other vasculitides and connective tissue disorders. The aim is to shed light on the potential for SAM to affect the coronary arteries and recommend screening of the coronary arteries of patients with SAM. © RSNA, 2019.

Association between loop diuretic dose administered in first 24 hours of heart failure admissions and length of hospital stay.

Background: Heart failure remains one of the highest disease burdens in the USA and worldwide. Heart failure guidelines recommend starting with a higher or equal to home dose of loop diuretics in acute decompensated heart failure admissions. To date, no study has been published assessing the effect of first 24 h loop diuretic dose on length of hospital stay. Objective: We hypothesize that the higher the first 24 h loop diuretic dose to home dose ratio, the shorter the length of hospital stay will be. Design/Methods: Retrospective chart review was conducted in a community teaching hospital and included patients discharged between February, 2015 and April, 2016, with a primary diagnosis of acute decompensated heart failure. The primary outcome was the length of hospital stay. The study population was divided into three groups based on the hospital to home dose ratio. Results: Among the 609 patients included in the data analysis, there was no statistically significant difference in length of hospital stay among the study groups. Inpatient mortality and incidence of acute kidney injury were highest in the group that received a first-24-hours hospital dose that was less than their home dose. Percentage of weight loss and 30-day readmission were not statistically significantly different among the groups. Conclusion: There was no association between the dose ratio and length of hospital stay in each group. Additional randomized controlled trials need to be conducted to provide more evidence and guidance for dosing loop diuretics in acute decompensated heart failure admissions.

Performance of severity of illness classification for Clostridium difficile infection to predict need-for-colectomy or inpatient death.

BACKGROUND: In current state of practice, disease severity assessment for Clostridium difficile infection (CDI) lacks consensus between different organizations. In the latest guidelines for management of CDI, authors have proposed a new disease severity classification. This classification has been derived from expert opinion and includes previously reported patient related factors that predict unfavorable outcome in CDI. OBJECTIVE: To evaluate the performance of new disease severity classification to predict CDI-related colectomy or in-patient deaths. METHODS: This observational study was performed at a 300-bed community hospital catering to a suburban population. All the adult patients discharged during October 2005 through September 2012 and diagnosed with CDI were included in the study. Cases of CDI were identified using the billing database. Demographic and clinical characteristics of CDI cases were extracted from medical chart reviews performed by two physician researchers. Cases were classified as mild-to-moderate, severe, or severe and complicated CDI. Major outcomes measured were in-patient deaths and colectomy attributed to CDI. For risk stratification, each variable of severe and complicated CDI was counted. RESULTS: In total, 59,897 patients were discharged from our hospital during the study period; 894 of them were diagnosed with CDI. Mean age of CDI cases was 74 years (standard deviation 15 years), 345 (39%) were male, and median length of hospital stay was 7 days (interquartile range 4-13). One hundred ninety-one patients (21%) were classified as mild-to-moderate, 93 patients (10%) as severe, and 610 patients (68%) as severe and complicated. In total, 14 patients underwent colectomy for CDI and 53 patients expired. In 35 of these patients, the cause of death was thought to be CDI. The combined outcome (CDI-related colectomy and/or death in hospital) occurred in 47 patients. None of the patients in mild-to-moderate disease or severe disease had combined outcome. On severe and complicated cases, as the score increased, rate of combined outcome increased significantly (z-12.7, p<0.0001). On plotting receiver-operating curve, the simple variable count had area under the curve of 0.91. CONCLUSION: The newly proposed disease severity classification for CDI categorized more than two-thirds of patients as severe and complicated. Increase in number of severe and complicated classifying variables increases the chance of adverse outcomes significantly. Patients meeting only one variable could be potentially treated as a severe case instead of severe and complicated. This data needs to validated prospectively before could be used in clinical practice.

Exercise-induced syncope in a sedentary woman.

Vasovagal (neurocardiogenic) syncope, a subtype of reflex syncope, has many well-known triggers. However, we found no previous report of vasovagal exercise-induced syncope in a sedentary person. We present the case of a 35-year-old sedentary woman who experienced vasovagal syncope as she underwent an exercise stress test. Results of evaluations, including resting and stress electrocardiography and echocardiography, were normal. Her presentation is highly unusual: syncope has typically not been associated with exercise except in young athletes, people with structural heart abnormalities, or people with a prolonged QT syndrome. To our knowledge, this is the first report of vasovagal syncope associated with exercise in a sedentary patient who had normal cardiac and electrophysiologic function. We suggest possible physiologic mechanisms and diagnostic strategies.