Current Projects

New research proposals requesting data from the STS National Database are assessed for overlap with active projects from all STS research programs, including PUF, A&P and Task Force on Funded Research (TFR). Please email the Research Center with any questions regarding this list.

Project Status Legend

  • Approved - Proposal has been approved for study by the A&P or PUF Task Force and its corresponding specialty review committee.
  • Analysis - Proposal is currently undergoing active analysis by the investigators and appropriate analytics center.
  • Abstract - An abstract for the proposal has been developed and submitted to a meeting.
  • Manuscript - A manuscript for the proposal has been drafted.

Updated June 16, 2021

Adult Cardiac Surgery Database (PUF)
Principal Investigator Proposal Title Project Status
Siavash Saadat
Baystate Medical Center
Utilization of multi-arterial coronary artery bypass grafting Analysis
Nimesh Desai
University of Pennsylvania
Analysis of patterns of malperfusion in patients presenting with acute type A aortic dissection Approved
Mark Slaughter
University of Louisville
Is mechanical unloading better than coronary artery bypass in ischemic cardiomyopathy patients with low ejection fraction? Abstract
Joanna Chikwe
Cedars-Sinai Medical Center
Efficacy of mitral valve surgery after attempted transcatheter mitral repair Manuscript
Daniel Rinewalt
Brigham and Women’s Hospital
Association of temporary mechanical circulatory support device use with ortality and adverse post-operative outcomes among patients with acute
 decompensated heart failure-related cardiogenic shock undergoing HT or durable VAD placement
Arman Arghami
Mayo Clinic
Comparing administrative (NIS/HCUP) database with clinical registry (STS) on postcardiac surgical outcomes Approved
Andreas de Biasi
University of Wisconsin Hospitals
Impact of illicit drug use in acute Type A aortic dissection Abstract
Natalia Ivascu
New York Presbyterian Hospital–Weill Cornell Medicine
Single red cell unit transfusion in cardiac surgical patients Analysis
Shinichi Fukuhara
University of Michigan
Non-aortic valve cardiac surgery in patients with transcatheter aortic bioprosthesis Analysis
Aamir Shah
Cedars-Sinai Medical Center
Contemporary outcomes of open surgical repair for the descending thoracic and thoracoabdominal aorta: An analysis of the STS National Database
Michael Mazzeffi
University of Maryland
RBC transfusion and postoperative infection risk in patients having coronary artery bypass grafting Analysis
Jacob Raphael
University of Virginia    
Delineating thromboembolic complications after RBC transfusion in cardiac surgery patients Approved
Hari Mallidi
Brigham and Women’s Hospital
The effect of the 2018 UNOS donor heart allocation policy change on cardiac transplantation and durable LVAD implantation in women Abstract
Marisa Cevasco
University of Pennsylvania
Disparities in mitral valve surgery Analysis
Emily MacKay
University of
Transesophageal echocardiography in open cardiac valve and proximal aortic surgery: Practice patterns and impact on clinical outcomes Manuscript
Tom Nguyen
University of Texas Health Science Center Houston
Trends and outcomes in adult cardiac surgery patients during the COVID pandemic Manuscript

Arminder Jassar
Massachusetts General Hospital

Correlation of hypothermic circulatory arrest duration and temperature with acute renal failure after aortic arch surgery Manuscript
Thomas Bilfinger
Stony Brook University School of Medicine
Single versus multi-center surgeons' risk-adjusted mitral valve repair procedural outcomes (SURGEON MVR) Analysis
Henry Tannous
Stony Brook University School of Medicine
Impact of coronary artery bypass graft clinical science research: The off-pump/on-pump treatment experience Analysis
Gabor Bagameri
Mayo Clinic
Comparison of the neurological outcomes after aortic arch repair: Endovascular approach vs. the standard of care (Open Repair) Analysis
Frederick Lombard
Vanderbilt University Medical Center
Intraoperative processed EEG and delirium, neurologic complications and mortality after cardiac surgery Manuscript
Neel Sodha
Rhode Island Hospital
Predicting hemorrhage and thrombosis in mechanical circulatory support: A study using machine learning Analysis
Oz Shapira
Hadassah Medical Center
Changing impact of repeat CABG on operative outcomes in the last two decades: Insights from the Society of Thoracic Surgeons Adult Cardiac Surgery Database Manuscript
Bradley Taylor
University of Maryland
Impact of revascularization technique on the risk of stroke and mortality during coronary artery bypass grafting: The analysis of the STS Adult Cardiac Surgery Database Manuscript
Miklos Kertai
Vanderbilt University Medical Center
Intraoperative and postoperative dexmedetomidine and delirium, severity of postoperative pain and outcomes after cardiac surgery Manuscript
Jonathan Haft
University of Michigan
Pulmonary thromboendarterectomy (PTE) for chronic thromboembolic pulmonary hypertension (CTEPH) Manuscript
Hartzell Schaff
Mayo Clinic
Center volume and surgical outcomes in hypertrophic cardiomyopathy: What impacts outcomes? Analysis
Brent Keeling
Emory University School of Medicine
Trends in emergency coronary artery bypass surgery Manuscript
Tom Nguyen
University of Texas Health Science Center Houston, McGovern Medical School
Nationwide outcomes of less invasive mitral surgery versus conventional sternotomy: Analysis of the Society of Thoracic Surgeons Adult Cardiac Surgery Database Manuscript
Ravi Ghanta
Baylor College of Medicine
Outcomes of aortic valve surgery for chronic aortic regurgitation Manuscript
Robert Hagberg
Hartford Hospital
Machine learning methods for mortality and morbidity after cardiac surgery Manuscript
Derek R. Brinster
Lenox Hill Hospital
Transfusion requirements in aortic root replacement  Manuscript
Michael J. Mack
The Heart Hospital Baylor Plano
Predicted risk of transfusion in isolated AVR Analysis
James R. Edgerton
The Heart Hospital Baylor Plano
Predicted risk of transfusion in isolated CABG Manuscript
Michael P. Macris
Memorial Hermann Health System
The impact of time interval between coronary angiography and cardiopulmonary bypass on acute kidney injury  Manuscript
Thomas Kelley
Dwight D. Eisenhower Army Medical Center
Effect of a balanced transfusion ratio on survival in patients in hemorrhagic shock after cardiac surgery  Manuscript
Dan Loberman
Brigham and Women’s Hospital
Myocardial preservation in minimal invasive mitral valve surgery Manuscript
Giovanni Filardo
The Heart Hospital Baylor Plano
Predicted risk of transfusion in isolated MVR and MV repair Analysis 
Joseph F. Sabik III
University Hospitals Cleveland Medical Center
Trends in use of FFR in patients undergoing surgical revascularization: Insights from the STS National Database  Manuscript
Thomas A. Schwann
Baystate Health
Elucidating surgeon and institutional volume – Outcome effects for multi-arterial and single-arterial coronary artery bypass grafting strategies  Analysis
Matthew Williams
University of Pennsylvania
Measuring the learning curve Manuscript
M. Scott Halbreiner
Allegheny General Hospital
Use of skeletonized versus pedicled internal thoracic artery: Is there a correlation with sternal wound infection  Manuscript
David L. Joyce
Medical College of Wisconsin
Minimally invasive versus conventional single vessel LIMA-LAD bypass grafting: A comparison of surgical outcomes from the STS National Database  Manuscript
Zain I. Khalpey
University of Arizona
Predictive strategies for the prevention of disease outcomes      Analysis
Arnar Geirsson
Yale School of Medicine
Pattern and predictors of oral anticoagulant and antiplatelet use following aortic valve replacement and mitral valve surgery 


Adult Cardiac Surgery Database (A&P)
Principal Investigator Proposal Title Project Status
Tsuyoshi Kaneko
Brigham and Women's Hospital
Benchmarking outcomes of surgical aortic valve replacement in patients with bicuspid aortic valves: An analysis of the Society of Thoracic Surgeons Database Analysis
Peter Smith
Duke University Medical Center
Validating a consumer-directed hospital rating system with the STS Adult Cardiac Surgery Database Analysis
George Arnaoutakis
University of Florida
The effect of the COVID-19 epidemic upon patterns of presentation and outcomes of acute aortic dissection Analysis
Gabriele Di Luozzo
Mount Sinai St. Luke’s Hospital
Nationwide trends and outcomes in the usage of adjuncts for spinal cord protection in patients undergoing open surgery for the descending thoracic or thoraco-abdominal aorta: 20-year analysis of the Society of Thoracic Surgeons Adult Cardiac Surgery Database (FUTURE ANALYSIS) Approved
Joseph Sabik
University Hospitals Cleveland Medical Center
Anticoagulation in new onset postoperative atrial fibrillation: An analysis from the STS Adult Cardiac Surgery Database Manuscript
Matthew Williams
University of Pennsylvania
Coronary artery bypass grafting with adjunct coronary endarterectomy: An analysis of the Society of Thoracic Surgeons Adult Cardiac Surgery Database Manuscript
Gorav Ailawadi
University of Virginia
Association between surgical volume and annular enlargement outcomes Manuscript
Danny Chu
University of Pittsburgh School of Medicine
Optimal temperature for aortic hemiarch replacement Procedure with antegrade cerebral perfusion strategy: How warm is too warm? Manuscript
Robert Hooker
INTEGRIS Baptist Medical Center
Prosthetic valve endocarditis In aortic valve surgery: The North American experience Manuscript
Jennifer Lawton
Johns Hopkins Division of Cardiac Surgery
Gender disparities in surgical coronary revascularization Manuscript
Thomas Schwann
University of Massachusetts - Baystate
The effects of peri-operative transfusions on intermediate term mortality in Medicare patients undergoing CABG – A report from the STS Cardiac Surgery Database 2011-2018 Analysis
Nicholas Teman
University of Virginia
Extracorporeal membrane oxygenation vs. right ventricular assist device for LVAD implant related right ventricular failure Manuscript
Vinod Thourani
Medstar Heart and Vascular Institute
Outcomes in patients undergoing mitral valve operations for ischemic mitral regurgitation in the United States Analysis
Thomas Bilfinger
Stony Brook University School of Medicine
Acute Type A aortic dissection (ATAAD) Repair in the US: An STS National Database Report (FUTURE ANALYSIS)


Prashanth Vallabhajosyula
University of Pennsylvania
Traditional total aortic arch replacement versus hybrid arch repair  Manuscript 
Carmelo A. Milano
Duke University Medical Center
Does duration of left ventricular assist device support have an effect on orthotopic heart transplantation outcomes? Manuscript
George Tolis
Massachusetts General Hospital
TEVAR vs open repair of descending thoracic aortic pathology: Long-term outcomes Manuscript
Vinod Thourani
Medstar Heart and Vascular Institute
Relationship of volume and outcomes in those patients undergoing AVR ± CABG in the US Manuscript


General Thoracic Surgery Database (PUF)
Principal Investigator Proposal Title Project Status
Maria Madariaga
University of Chicago
Association of preoperative risk analysis index and postoperative outcomes in general thoracic surgery patients Analysis
Mark Ferguson
University of Chicago
Predictive value of modified frailty index in postoperative outcomes following major oncologic lung resection and the abrogation effect of VATS approach on modified frailty index Analysis
Stephanie Worrell
University Hospitals
Peri-operative outcomes for esophagectomy performed for benign versus malignant esophageal disease Abstract
Henning Gaissert
Massachusetts General Hospital
Center level variation and association of nodal sampling and clinical nodal assessment Analysis
Jacob Klapper
Duke University Medical Center
Perioperative outcomes of thymectomy for patients with myasthenia gravis Manuscript
Elisabeth Dexter
Massachusetts General Hospital
Is increasing operative duration associated with worse analysis outcomes for lung resection?
Christopher Seder
Rush University Medical Center
Impact of obesity on conversion to thoracotomy in video-assisted vs robotic-assisted pulmonary resections Manuscript
Mark Allen
Mayo Clinic
A study of thoracic surgeon bias in lung cancer surgery Manuscript
Peter Kneuertz
The Ohio State University Wexner Medical Center
Trends and outcomes of pulmonary segmentectomy for non-small cell lung cancer by robotic, video-assisted thoracoscopic, and thoracotomy approach in the STS National Database Manuscript
Brandon H. Tieu
Oregon Health & Science University
Chylothorax after esophagectomy: A review of the STS National Database  Manuscript
Matthew A. Facktor
Geisinger Medical Center
ProvenCare® lung cancer collaborative Manuscript
Ikenna Okereke
University of Texas Medical Branch
Outcomes after surgical lung biopsy: An analysis of the STS National Database Approved
Christopher R. Morse
Massachusetts General Hospital
Role of increasing obesity in perioperative pathologic staging following resection of primary esophageal cancer  Manuscript
Douglas J. Mathisen
Massachusetts General Hospital
Predictors and impact of extended lymphadenectomy on outcomes following esophagectomy for primary esophageal cancer Manuscript
Nicholas Arndt
Rush University Medical Center
Redefining the risk of surgery for Stage IIIA (N2) non-small cell lung cancer: An analysis of the STS General Thoracic Surgery Database Manuscript
General Thoracic Surgery Database (A&P)
Principal Investigator Proposal Title Project Status
Stephanie Worrell
University Hospitals
The impact of diabetes on pathologic response to multi-modality therapy for esophageal cancer Analysis
Andrea Wolf
Mt. Sinai Hospital
Robotic esophagectomy trends and early surgical outcomes: The US experience Analysis
Cherie Erkmen
Temple University Health System  
Clinical-pathologic stage discordance in early esophageal cancer Analysis
Daniel Miller and Elliot Servais
Wellstar Health System/Lahey Hospital and Medical Center
Quality assessment of reasons for open conversion during minimally invasive (thoracoscopic and robotic) lung 
resection and the associated morbidity and mortality
Phillip Linden
University Hospitals 
Cleveland Medical Center
Perioperative risk of each individual lobectomy Manuscript
Nathaniel R. Evans
Thomas Jefferson University Hospital
Predictors of prolonged air leak and chest tube duration after lobectomy Manuscript
Congenital Heart Surgery Database (PUF)
Principal Investigator Proposal Title Project Status
Joanne Starr
CHOC Children's Hospital
Relationship between temperature and perfusion strategies and neurological outcomes in neonatal congenital heart surgery Analysis
Richard Kim
Cedars-Sinai Medical Center
Short-term outcomes of the Ross procedure and its volume-outcome relationship in children using the STS Congenital Heart Surgery Database Analysis
David Morales
Cincinnati Children's Hospital Medical Center
A prediction tool for outcomes in children with congenital heart disease who undergo post-cardiotomy extracorporeal membrane oxygenation: A report from the Society of Thoracic Surgeons National Database Approved
Shriprasad Deshpande
Children’s National Medical Center
Transitioning from temporary support to VAD support in pediatric patients: Perioperative morbidity and outcomes Analysis
Carlos Mery
Dell Children’s Medical Center
Neighborhood sociodemographic factors impact on incidence and outcomes in congenital heart surgery Approved
Jennifer Nelson
Nemours Children’s Hospital
Development of a current ACHD mortality risk score and comparison to current STS-PROM and STAT mortality assessments Manuscript
Henry Walters
Children’s Hospital of Michigan
Outcomes in patients with sickle cell disease and sickle cell trait undergoing surgery for congenital heart disease
Viviane Nasr
Boston Children’s Hospital
The geographic distribution of pediatric cardiac anesthesiologists relative to cardiac surgeons and pediatric cardiac surgeries in the United States Analysis
Nicole D. Zantek
University of Minnesota
Risk factors for platelet transfusion and impact of platelet transfusions on outcomes in patients undergoing congenital heart surgery Analysis
Congenital Heart Surgery Database (A&P)
Principal Investigator Proposal Title Project Status
Marshall Jacobs
Johns Hopkins School of Medicine
Staged operative strategies in CHSD Manuscript
Pirooz Eghtesady
St. Louis Children's Hospital
Controversies of the Kawashima procedure, national trends and outcomes Approved
Danielle Gottlieb-Sen
Johns Hopkins University
The STS Congenital Heart Surgery Database Update on the patterns of management of Tetralogy of Fallot Approved
Tara Karamlou
Cleveland Clinic
Contemporary applications of pulmonary artery banding: An analysis of the STS Congenital Heart Surgery Database Analysis
David Bichell
Monroe Carrell Jr. Children’s Hospital at Vanderbilt
Surgical management of congenitally corrected transposition of the great arteries: Practice patterns and outcomes Manuscript
Victor Morell
Children’s Hospital of Pittsburgh
Delineating the optimal operative approach for treating patients with transposition of the great arteries with ventricular septal defects and left ventricular outflow tract obstruction Manuscript
Jeffrey P. Jacobs
University of Florida
Creation and evaluation of a case mix index for pediatric and congenital cardiac surgery Analysis
Ram Kumar Subramanyan
Children’s Hospital, Los Angeles
Surgical outcomes following repair of tetralogy of Fallot with absent pulmonary valve syndrome Analysis
Robert D. B. Jaquiss
Duke University Medical Center
Post-operative cardiac catheterization in children undergoing congenital heart surgery: An analysis of the STS Congenital Heart Surgery Database Manuscript
Intermacs/Pedimacs Database (PUF)
Principal Investigator Proposal Title Project Status
Eric Adler             
University of California-San Diego
Machine learning for prognostication in advanced heart failure Approved
Shahnawaz Amdani            
Cleveland Clinic Children’s Hospital
Impact of center volume on outcomes after Ventricular Assist Device implantation in pediatric patients: An analysis of the PediMACS Database Approved
Francis Pagani    
University of Michigan
Impact of center transplant availability on receipt of transplant after durable LVAD Analysis
Michael Pienta    
University of Michigan
Variation in major adverse events after durable LVAD implantation Analysis
Randall Starling
Cleveland Clinic
Post-implant phosphodiesterase Type 5 inhibitors use Analysis
Amin Yehya   
Sentara Heart Hospital
Characterization of outcomes in LVAD recipients with human immunodeficiency virus Analysis
Renzo Loyaga-Rendon                Spectrum Health  Risk score development for stratification of survival in patients undergoing durable mechanical circulatory support: An STS Intermacs Database analysis Analysis
Themistokles Chamogeorgakis
University of Michigan
Right ventricular support in the context of biventricular failure: An Intermacs analysis Abstract
Jerry Estep
Cleveland Clinic
Predictors of hospital readmission burden and survival analysis in patients with contemporary continuous flow left ventricular assist device (CF-LVAD) Abstract
Lucian Lozonschi  Medical University of South Carolina Ventricular arrhythmia post cf-left ventricular assist device placement – Trends within the STS Intermacs in the contemporary era Analysis
Meredith Brisco-Bacik
Temple University
Prevalence, predictors and prognostic importance of changes in renal function following continuous flow left ventricular assist device support: An Intermacs analysis
Sameed Khatana
Hospital of the University of Pennsylvania    
Trends in durable ventricular assist device implantation rates with the Affordable Care Act and Medicaid expansion and association of post-implantation outcomes with payor
Duc Thinh Pham        
Northwestern University
Risk assessment model for wait list mortality in left ventricular assist device patients Analysis
Edward Grandin        
Beth Israel Deaconess Medical Center
Assessing the impact of beta-blockers on late right heart failure and survival after left ventricular assist device implantation (PUF) Manuscript
Karen Uzark            
University of Michigan
Quality of life in children on ventricular assist device (VAD) support: Analysis from Pedimacs Abstract

Please click here for additional information about current Intermacs projects in the A&P/PUF tracks.

Intermacs/Pedimacs Database (A&P)
Principal Investigator Proposal Title Project Status
Arman Kilic
Medical University of South Carolina
Impact of adverse events on health-related quality of life after left ventricular assist device implantation Analysis
James Kirklin
University of Alabama-Birmingham
Mortality risk prediction for patients who receive a HeartMate3 left ventricular assistance device Analysis
Jennifer Cowger
Henry Ford Health System
Defining short- and long-term optimal outcomes for patients on continuous flow left ventricular assist device support: An STS Intermacs analysis Analysis
Joanna Chikwe    
Cedars-Sinai Medical Center 
Contemporary outcomes of ventricular assist devices in the treatment of geriatric heart failure Manuscript
Lynne Stevenson
Vanderbilt University Medical Center
Pre-implant Left Ventricular Assist Device strategies and subsequent short and long-term outcomes – A second look Abstract
Francis Pagani
University of Michigan
Generalizability of MOMENTUM 3 clinical trial results to the “real world” Intermacs Experience Manuscript
David Morales
Cincinnati Children's
Outcomes after ventricular assist device implantation in patients with Fontan palliation Abstract
James Bergin
University of Virginia
Defining a phenotype for failure in bridge to transplant LVAD therapy Manuscript
Kenan Yount
University of Virginia
Effects of preoperative or postoperative dialysis on LVAD outcomes, patient survival, progression to transplantation and quality of life Manuscript
Sung Min-Cho
Johns Hopkins
Real-world data of stroke in HeartMate 3, HeartMate II, and HeartWare and impact of center characteristics on stroke outcomes: An Intermacs analysis (Approved as joint collaborative proposal with John Kern) Manuscript
John Kern
University of Virginia
Major adverse neurological event rate by centrifugal vs axial flow device in the modern era (Approved as joint collaborative project with Sung Min-Cho) Abstract

Shahnawaz Amdani
Cleveland Clinic

Model for end-stage liver disease excluding INR (MELD-XI) score predicts outcomes in pediatric patients supported with ventricular assist device: An analysis of the Pedimacs registry Manuscript
Francisco Arabia
Banner Health/University of Arizona
Heart transplant outcomes post total artificial heart BTT Abstract
Jennifer Cowger
Henry Ford Hospital
Ventricular assist device patient phenotypes: What attributes describe long-term survival? Manuscript
Robert Niebler
Medical College of Wisconsin
Incidence and outcomes of, and risk factors for, neurological adverse events in children support with ventricular assist devices Manuscript
Josef Stehlik
University of Utah School of Medicine
Mortality by body mass index in adult heart transplant recipients – Direct to transplant vs. mechanical circulatory support bridge strategy Abstract
Bryan Whitson
The Ohio State University
Assessing the impact of surgical implant approach on perioperative right ventricular failure associated with left ventricular assist devices Manuscript

Please click here for additional information about current Intermacs projects in the A&P/PUF tracks.