Publications by authors named "Nicholas Teman"

Objectives: A recent coronavirus-related factory shutdown led to a global shortage of iodinated contrast. The authors evaluated how the contrast shortage impacted percutaneous coronary interventions (PCI).

Methods: Using a statewide database incorporating CathPCI registry data from 19 hospitals, the authors evaluated 2 time periods: pre-shortage (May 1, 2021 - April 30, 2022) and during the shortage (May 1, 2022 - October 31, 2022).

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Ventricular septal defect (VSD) is a life-threatening complication occurring after delayed presentation of acute myocardial infarction (AMI). We assessed clinical characteristics based on mortality following surgical repair of post-AMI VSD and evaluated trends of mortality, mechanical circulatory support (MCS) device use, and surgical approach. We included all patients who had surgical VSD repair following AMI who were included in a regional quality collaborative from May 2008 through January 2020.

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Background: Donor stagnation and modification of lung allocation scores has resulted in a higher acuity of patient presentation prior to lung transplantation. Extracorporeal membrane oxygenation (ECMO) has been utilized as a bridge to lung transplant (BTT) although the effect of cannulation strategy on outcomes has not been well investigated. We sought to analyze contemporary data on ECMO BTT utilizing a large, international registry of patients.

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Objective: Intensive care unit length of stay (ICU LOS) accounts for a large percentage of inpatient cost after cardiac surgery. The Society of Thoracic Surgeons risk calculator predicts total LOS but does not discriminate between ICU and non-ICU time. We sought to develop a predictive model of prolonged ICU LOS.

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Background: The impact of socioeconomic distress on readmission rates following cardiac surgery has not been studied. We hypothesized that patients living in distressed communities would have a higher 30-day readmission rate after cardiac surgery compared to those living in less distressed communities.

Methods: Patients undergoing isolated coronary artery bypass grafting (CABG) between 2016 and 2023 within a regional collaborative were identified.

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Introduction: The physiologic derangements imposed by cardiopulmonary bypass (CPB) can result in complications such as postoperative delirium. We aim to validate a rodent survival model of CPB demonstrating a systemic inflammatory response and hypothesize that this contributes to post-CPB delirium.

Methods: Adult Sprague-Dawley rats were randomized to three groups: 1) Sham peripheral surgical cannulation, 2) CPB followed by acute phase harvest, or 3) CPB followed by 24-h survival.

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Article Synopsis
  • This study investigates the relationship between mortality rates for patients undergoing extracorporeal cardiopulmonary resuscitation (ECPR) based on where in the hospital their cardiac arrest occurs, as well as the effect of moving patients for cannulation on their outcomes.
  • The research analyzed data from 2,515 patients who experienced in-hospital cardiac arrest between 2020 and 2023 at hospitals reporting to the Extracorporeal Life Support Organization (ELSO).
  • Results showed significantly higher odds of mortality for patients who had cardiac arrests in the ICU or acute care beds compared to those in the cardiac catheterization lab, while relocating patients for cannulation did not have a notable impact on survival rates.
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Introduction: Academic cardiac surgeons are productive researchers and innovators. We sought to perform a comprehensive machine learning (ML)-based characterization of cardiac surgery research over the past 40 y to identify trends in research pursuits.

Methods: US-based academic websites were queried for surgeon profiles.

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Background: Due to staffing changes at scheduled intervals and decreases in essential staff in the evenings, late intensive care unit (ICU) arrivals may be at risk for suboptimal outcomes. Utilizing a regional collaborative, we sought to determine the effect of ICU arrival timing on outcomes in elective isolated coronary artery bypass.

Methods: Adults undergoing elective, isolated coronary artery bypass from 17 hospitals between 2013 and 2023 were identified.

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Objective: The impact of Cardiac Surgical Unit-Advanced Life Support (CSU-ALS) training on failure to rescue after cardiac arrest (FTR-CA) is unknown. We hypothesized that institutional CSU-ALS certification would be associated with lower FTR-CA.

Methods: Patients undergoing Society of Thoracic Surgeons index operations from 2020 to 2023 from a regional collaborative were analyzed.

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Objective: The study objective was to evaluate short-term outcomes and statewide practice patterns of prophylactic left atrial appendage ligation in patients undergoing coronary artery bypass grafting without preoperative atrial fibrillation.

Methods: Adult patients who underwent on-pump coronary artery bypass grafting (2017-2023) within a regional collaborative were identified. Patients with a history of atrial fibrillation, previous cardiac surgery, or nondevice-based left atrial appendage ligation were excluded.

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Background: The utility of operating room extubation (ORE) after cardiac surgery over fast-track extubation (FTE) within 6 hours remains contested. We hypothesized ORE would be associated with equivalent rates of morbidity and mortality, relative to FTE.

Methods: Patients undergoing nonemergent cardiac surgery were identified in The Society of Thoracic Surgeons Adult Cardiac Surgery Database between July 2017 and December 2022.

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Objective: Mitral valve repair is the gold standard for treatment of mitral regurgitation, but the optimal technique remains debated. By using a regional collaborative, we sought to determine the change in repair technique over time.

Methods: We identified all patients undergoing isolated mitral valve repair from 2012 to 2022 for degenerative mitral disease.

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Background: Adult extracorporeal membrane oxygenation (ECMO) patients are at high risk for allogeneic blood transfusion. Few studies have characterized iatrogenic blood loss from phlebotomy in adult ECMO patients. We hypothesized that iatrogenic phlebotomy would be a significant source of blood loss during ECMO.

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Background: Differences in outcomes by indication for venoarterial extracorporeal life support (VA-ECLS) are poorly described. We hypothesized that patients on VA-ECLS for acute pulmonary embolism (PE) have fewer complications and better survival than patients on VA-ECLS for other indications.

Methods: All patients ≥18 years on VA-ECLS from the Extracorporeal Life Support Organization global registry (2010-2019) were evaluated (n = 29,842).

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Objective: Psoas muscle size is a reliable marker of sarcopenia and frailty that correlates with adverse outcomes after cardiac surgery. However, its use in mitral and minimally invasive cardiac surgery is lacking. We sought to determine whether frailty, as measured by psoas muscle index, increases surgical risk for minimally invasive mitral valve surgery.

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Objectives: To explore trends in intraoperative procoagulant factor concentrate use in patients undergoing heart transplantation (HTx) in Virginia. Secondarily, to evaluate their association with postoperative thrombosis.

Design: Patients who underwent HTx were identified using a statewide database.

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Objective: Postoperative delirium after cardiac surgery is associated with long-term cognitive decline and mortality. We investigated whether increased ICU Confusion Assessment Method scores were associated with greater 30-day mortality and failure to rescue after cardiac surgery.

Methods: We studied 4030 patients who underwent a Society of Thoracic Surgeons index operation at the University of Virginia Health System from 2011 to 2021.

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Objective: Renal failure after cardiac surgery is associated with increased morbidity and mortality. There is a lack of data examining the rate of renal recovery after patients have started dialysis following cardiac surgery. We aimed to determine the frequency of and time to renal recovery of patients requiring dialysis after cardiac surgery.

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Objective: Literature describing outcomes of myocardial ischemia after coronary artery bypass grafting is sparse. We hypothesized these patients had more complications and incurred higher costs of care.

Methods: Using adult cardiac surgery data and cardiac catheterization (CathPCI) data from the Virginia Cardiac Services Quality Initiative, we identified patients who underwent unplanned cardiac catheterization after coronary artery bypass grafting from 2018 to 2021.

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Article Synopsis
  • Adults undergoing heart surgery are at high risk for respiratory complications, including COVID-19, but being fully vaccinated can help reduce this risk.
  • This study evaluated the impact of cardiopulmonary bypass (CPB) on COVID-19 antibody levels in 77 patients who had surgery; it found that antibody concentrations significantly dropped immediately after surgery but returned to pre-surgery levels within a month.
  • The research highlights the importance of monitoring COVID-19 vaccination status in cardiac surgery patients, as there was one reported case of COVID-19 pneumonia that resulted in death, emphasizing the need for enhanced safety measures during and after surgery.
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Introduction: Deep sternal wound infection (DSWI) is a rare complication associated with high mortality. Seasonal variability in surgical site infections has been demonstrated, however, these patterns have not been applied to DSWI. The purpose of this study was to assess temporal clustering of DSWIs.

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