Publications by authors named "Kipp Johnson"

Background: Patients with heart failure (HF) are at high risk for adverse outcomes when they have COVID-19. Reports of COVID-19 vaccine-related cardiac complications may contribute to vaccine hesitancy in patients with HF.

Methods: To analyze the impact of COVID-19 vaccine status on clinical outcomes in patients with HF, we conducted a retrospective cohort study of the association of COVID-19 vaccination status with hospitalizations, intensive care unit admission and mortality after adjustment for covariates.

View Article and Find Full Text PDF

There have been no previous attempts to assess coronary plaque morphology in statin-treated patients with combined residual cholesterol and inflammatory risk. The aim of this study was to characterize the morphology using optical coherence tomography (OCT) and to investigate the underlying molecular mechanisms. Two hundred seventy statin-treated patients with stable coronary artery disease who underwent OCT imaging prior to elective percutaneous coronary intervention were included in this single-center retrospective analysis.

View Article and Find Full Text PDF

Polygenic diseases, which are genetic disorders caused by the combined action of multiple genes, pose unique and significant challenges for the diagnosis and management of affected patients. A major goal of cardiovascular medicine has been to understand how genetic variation leads to the clinical heterogeneity seen in polygenic cardiovascular diseases (CVDs). Recent advances and emerging technologies in artificial intelligence (AI), coupled with the ever-increasing availability of next generation sequencing (NGS) technologies, now provide researchers with unprecedented possibilities for dynamic and complex biological genomic analyses.

View Article and Find Full Text PDF

Opioids are a class of drugs that are known for their use as pain relievers. They bind to opioid receptors on nerve cells in the brain and the nervous system to mitigate pain. Addiction is one of the chronic and primary adverse events of prolonged usage of opioids.

View Article and Find Full Text PDF

The development of artificial intelligence (AI) has increased dramatically in the last 20 years, with clinical applications progressively being explored for most of the medical specialties. The field of gastroenterology and hepatology, substantially reliant on vast amounts of imaging studies, is not an exception. The clinical applications of AI systems in this field include the identification of premalignant or malignant lesions (, identification of dysplasia or esophageal adenocarcinoma in Barrett's esophagus, pancreatic malignancies), detection of lesions (, polyp identification and classification, small-bowel bleeding lesion on capsule endoscopy, pancreatic cystic lesions), development of objective scoring systems for risk stratification, predicting disease prognosis or treatment response [, determining survival in patients post-resection of hepatocellular carcinoma), determining which patients with inflammatory bowel disease (IBD) will benefit from biologic therapy], or evaluation of metrics such as bowel preparation score or quality of endoscopic examination.

View Article and Find Full Text PDF

Objectives: This study sought to develop DL models capable of comprehensively quantifying left and right ventricular dysfunction from ECG data in a large, diverse population.

Background: Rapid evaluation of left and right ventricular function using deep learning (DL) on electrocardiograms (ECGs) can assist diagnostic workflow. However, DL tools to estimate right ventricular (RV) function do not exist, whereas those to estimate left ventricular (LV) function are restricted to quantification of very low LV function only.

View Article and Find Full Text PDF

Robust phenotyping of patients from electronic health records (EHRs) at scale is a challenge in clinical informatics. Here, we introduce Phe2vec, an automated framework for disease phenotyping from EHRs based on unsupervised learning and assess its effectiveness against standard rule-based algorithms from Phenotype KnowledgeBase (PheKB). Phe2vec is based on pre-computing embeddings of medical concepts and patients' clinical history.

View Article and Find Full Text PDF

A combination of emerging genomic and artificial intelligence (AI) techniques may ultimately unlock a deeper understanding of heterogeneity and biological complexities in cardiovascular diseases (CVDs), leading to advances in prognostic guidance and personalized therapies. We discuss the state of AI in cardiovascular genetics, current applications, limitations, and future directions of the field.

View Article and Find Full Text PDF

Background: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and the associated Coronavirus Disease 2019 (COVID-19) is a public health emergency. Acute kidney injury (AKI) is a common complication in hospitalized patients with COVID-19 although mechanisms underlying AKI are yet unclear. There may be a direct effect of SARS-CoV-2 virus on the kidney; however, there is currently no data linking SARS-CoV-2 viral load (VL) to AKI.

View Article and Find Full Text PDF
Article Synopsis
  • Atrial fibrillation (AF) can lead to serious health issues if not detected early, and the study aims to use a deep neural network to predict new-onset AF from resting 12-lead ECGs in patients without a previous AF history.
  • Researchers analyzed 1.6 million ECG traces from 430,000 patients, achieving good predictive performance with an area under the receiver operating characteristic curve of 0.85, indicating an effective ability to identify those at risk for AF within a year.
  • The model also demonstrated that it could indicate a high risk for AF-related strokes, successfully identifying 62% of patients who experienced such strokes within three years, thereby highlighting the potential for targeted screening strategies.
View Article and Find Full Text PDF
Article Synopsis
  • Machine learning models require large datasets, often limited by data silos across healthcare institutions, particularly in COVID-19 research focused on single hospitals.
  • The study utilized federated learning to predict 7-day mortality in hospitalized COVID-19 patients, using data from five hospitals within the Mount Sinai Health System without aggregating sensitive patient data.
  • Results showed that the LASSO model performed better at three hospitals and the multilayer perceptron (MLP) model outperformed at all five, indicating that federated learning can create effective predictive models while protecting patient privacy.
View Article and Find Full Text PDF
Article Synopsis
  • The study aimed to analyze clinical characteristics and outcomes of hospitalized COVID-19 patients, comparing those who died in the hospital to those who were discharged alive.
  • Data was collected from five hospitals in the Mount Sinai Health System for patients confirmed with COVID-19 between February and April 2020, focusing on demographics, clinical features, and mortality rates.
  • Results showed that nearly half of the 2199 hospitalized patients were discharged, with a 29% overall mortality rate, higher rates of pre-existing conditions and lower lymphocyte percentages observed in patients who died compared to those who recovered.
View Article and Find Full Text PDF

The neurological ICU (neuro ICU) often suffers from significant limitations due to scarce resource availability for their neurocritical care patients. Neuro ICU patients require frequent neurological evaluations, continuous monitoring of various physiological parameters, frequent imaging, and routine lab testing. This amasses large amounts of data specific to each patient.

View Article and Find Full Text PDF

Background: Apoptosis in atherosclerotic lesions contributes to plaque vulnerability by lipid core enlargement and fibrous cap attenuation. Apoptosis is associated with exteriorization of phosphatidylserine (PS) and phosphatidylethanolamine (PE) on the cell membrane. Although PS-avid radiolabeled annexin-V has been employed for molecular imaging of high-risk plaques, PE-targeted imaging in atherosclerosis has not been studied.

View Article and Find Full Text PDF
Article Synopsis
  • Ambulatory monitoring is essential for cardiovascular care but faces challenges due to unpredictable events and variable data significance, along with new physiological biosignals that help detect abnormalities more frequently.
  • Technological advancements and machine learning may enhance diagnosis accuracy and clinical actionability, but this raises concerns about the reliability and ethics of these methods.
  • The review discusses the current landscape of cardiovascular monitoring, from acquiring biosignals to using advanced analytical techniques, while highlighting regulatory and ethical considerations and proposing new approaches for monitoring.
View Article and Find Full Text PDF

Background And Objectives: Sepsis-associated AKI is a heterogeneous clinical entity. We aimed to agnostically identify sepsis-associated AKI subphenotypes using deep learning on routinely collected data in electronic health records.

Design, Setting, Participants, & Measurements: We used the Medical Information Mart for Intensive Care III database, which consists of electronic health record data from intensive care units in a tertiary care hospital in the United States.

View Article and Find Full Text PDF
Article Synopsis
  • The COVID-19 pandemic has led to significant illness and mortality worldwide, highlighting the need for better resource allocation and risk identification for patients.
  • This study aimed to analyze electronic health records from COVID-19 patients in the Mount Sinai Health System to develop machine learning models predicting hospital outcomes based on patient characteristics at admission.
  • Using the XGBoost algorithm, the study found strong predictive performance for in-hospital mortality and critical events, with high accuracy scores across various time frames and effective model validation across multiple hospitals.
View Article and Find Full Text PDF

Several machine learning (ML) algorithms have been increasingly utilized for cardiovascular disease prediction. We aim to assess and summarize the overall predictive ability of ML algorithms in cardiovascular diseases. A comprehensive search strategy was designed and executed within the MEDLINE, Embase, and Scopus databases from database inception through March 15, 2019.

View Article and Find Full Text PDF
Article Synopsis
  • Machine learning is becoming more common in cardiology, especially for cardiovascular imaging, but inconsistencies in model performance and interpretation can arise from the complexity of ML algorithms.
  • This paper builds on existing literature to provide a comprehensive list of responsibilities necessary for developing ML models, aimed at helping researchers and clinicians with uniform reporting of their findings.
  • A multidisciplinary panel of experts created a checklist of requirements to minimize algorithmic errors and biases, highlighting steps to ensure the correct use of ML models, which may evolve as research progresses.
View Article and Find Full Text PDF

Machine learning (ML) models require large datasets which may be siloed across different healthcare institutions. Using federated learning, a ML technique that avoids locally aggregating raw clinical data across multiple institutions, we predict mortality within seven days in hospitalized COVID-19 patients. Patient data was collected from Electronic Health Records (EHRs) from five hospitals within the Mount Sinai Health System (MSHS).

View Article and Find Full Text PDF
Article Synopsis
  • The study focused on the degree of heart damage, indicated by troponin levels, in over 2,700 hospitalized COVID-19 patients at Mount Sinai Health System from late February to early April 2020.
  • Results showed that 36% of these patients had elevated troponin levels, with higher rates of heart-related conditions like coronary artery disease linked to these elevations.
  • The findings revealed that even minor troponin increases significantly correlated with higher mortality rates, especially in patients with existing cardiovascular diseases.
View Article and Find Full Text PDF
Article Synopsis
  • Study analyzed myocardial injury in hospitalized COVID-19 patients at Mount Sinai Health System in NYC, focusing on troponin levels to assess heart damage.
  • 18.5% of the 2,736 patients died during hospitalization, with higher troponin levels correlating to increased mortality risk.
  • Results suggest that myocardial injury is common in COVID-19 patients, especially those with pre-existing cardiovascular diseases, and indicates non-ischemic heart damage related to the virus.
View Article and Find Full Text PDF

Background: The coronavirus 2019 (Covid-19) pandemic is a global public health crisis, with over 1.6 million cases and 95,000 deaths worldwide. Data are needed regarding the clinical course of hospitalized patients, particularly in the United States.

View Article and Find Full Text PDF

Despite substantial advances in the study, treatment, and prevention of cardiovascular disease, numerous challenges relating to optimally screening, diagnosing, and managing patients remain. Simultaneous improvements in computing power, data storage, and data analytics have led to the development of new techniques to address these challenges. One powerful tool to this end is machine learning (ML), which aims to algorithmically identify and represent structure within data.

View Article and Find Full Text PDF
Article Synopsis
  • The study investigates using a deep neural network (DNN) to predict 1-year all-cause mortality from electrocardiogram (ECG) voltage-time data collected over 34 years.
  • The DNN was trained on over 1.1 million ECGs from nearly 253,400 patients, achieving a high accuracy (AUC of 0.88) in predicting mortality, even among patients whose ECGs were deemed 'normal' by doctors.
  • Results indicate that the DNN can uncover significant prognostic insights that may not be apparent to cardiologists, with a notable hazard ratio of 9.5 for predicting 1-year mortality.
View Article and Find Full Text PDF