Andrew Duffy, MD, FACS, FASMBS
Associate Professor of Surgery (Bariatric, Minimally Invasive)Cards
About
Titles
Associate Professor of Surgery (Bariatric, Minimally Invasive)
Associate Surgical Chief, Digestive Health; Medical Director, Yale New Haven Health System Hernia Program; Interim General Surgery Residency Program Director, Surgery
Biography
Andrew J. Duffy, MD, FACS, FASMBS is a Board Certified General Surgeon and is fellowship-trained in minimal access surgery. He is the Associate Surgical Chief of the Digestive Health Service line and the Medical Director of the Hernia Center for Yale-New Haven Health System. He has additional subspecialty certification through the American Board of Surgery in Metabolic and Bariatric Surgery. He offers minimally invasive surgery of the abdomen and GI tract, including laparoscopic and robotic techniques.
Dr. Duffy has a long history in surgical education. He has developed simulator programs and utilized other technology to help develop the Yale surgical residents and fellows into top Minimally Invasive and Robotic Surgeons
He is currently the interim Program Director for the General Surgery Residency Program at Yale
His clinical goal is to offer the most effective surgery with the least recovery time and post-operative discomfort.
Dr. Duffy is dedicated to helping individuals with acute and chronic issues related to hernias or with their stomach, intestines, gallbladder, or other abdominal organs. He specializes in all type of primary and recurrent abdominal wall. He has extensive experience at surgically treating hernia surgery-related complications, including mesh problems.
He also offers minimally invasive techniques for correcting hiatal hernias, GERD, acid reflux, paraesophageal hernias, complications of prior stomach and hiatal hernia surgery, achalasia and other swallowing disorders.
He also specializes in laparoscopic and robotic procedures for obesity, including gastric bypass, sleeve gastrectomy, adjustable gastric banding and revision of prior bariatric surgery.
He specializes in laparoscopic gastrointestinal surgery; laparoscopic bariatric surgery for morbid obesity; laparoscopic gastric bypass surgery; laparoscopic adjustable gastric banding; laparoscopic sleeve gastrectomy; revisional bariatric surgery; laparoscopic surgery for reflux and achalasia; laparoscopic Nissen, laparoscopic Heller myotomy; laparoscopic splenectomy; laparoscopic paraesophageal hernia repair; laparoscopic repair of abdominal-wall hernias; laparoscopic repair of inguinal hernias; gall bladder; gall stones; cholecystectomy; gall stone pancreatitis; Gastroesophageal Reflux Disease (GERD); gastroparesis. Robotic surgery
Appointments
Bariatric & Minimally Invasive Surgery
Associate Professor on TermPrimary
Other Departments & Organizations
- Bariatric & Minimally Invasive Surgery
- Center for Weight Management
- Obesity Research Working Group
- Surgery
- Yale Medicine
- Yale Ventures
Education & Training
- Clinical Fellow
- Weill Medical College of Cornell University (2004)
- Chief Resident
- University of Massachusetts Medical School (2003)
- Resident
- University of Massachusetts Medical School (2002)
- MD
- University of Massachusetts Medical School (1996)
- BS
- Boston College (1992)
Research
Publications
2024
Ventral hernia repair with permanent mesh for non-Hispanic black versus white patients: access and post-operative outcomes in the era of robotic surgery
Chao G, Ying L, Huang L, Ma J, Ghiassi S, Gibbs K, Nadzam G, Morton J, Duffy A, Zhou R. Ventral hernia repair with permanent mesh for non-Hispanic black versus white patients: access and post-operative outcomes in the era of robotic surgery. Surgical Endoscopy 2024, 1-8. PMID: 39433584, DOI: 10.1007/s00464-024-11252-5.Peer-Reviewed Original ResearchRobotic surgeryVentral hernia repairBlack patientsHernia repairPermanent meshT-scoreEra of robotic surgeryAbdominal Core Health Quality CollaborativeRate of laparoscopyHigher pain scoresPatient outcomesPost-operative outcomesSurgical site infectionPropensity-score matchingVentral hernia surgeryRecurrence scoreChi-square testPain scoresSite infectionFisher's exactHernia recurrenceOpen approachHernia surgeryWhite patientsSurgeryWeight Nadir and Long-Term Weight Outcomes After Laparoscopic Sleeve Gastrectomy in a Diverse Cohort of Adolescents and Young Adults
Hornick M, Chao G, Ying L, Nadzam G, Duffy A, Ghiassi S, Graetz E, Gibbs K, Morton J. Weight Nadir and Long-Term Weight Outcomes After Laparoscopic Sleeve Gastrectomy in a Diverse Cohort of Adolescents and Young Adults. Obesity Surgery 2024, 34: 2965-2973. PMID: 38935262, DOI: 10.1007/s11695-024-07374-3.Peer-Reviewed Original ResearchPreoperative weightSleeve gastrectomyWeight nadirWeight outcomesIntroductionLaparoscopic sleeve gastrectomyLaparoscopic sleeve gastrectomyGroup of patientsWeight loss strategiesYoung adultsDiverse group of patientsCohort of adolescentsLongitudinal weight dataBariatric proceduresFollow-upNon-Hispanic blacksLoss strategiesMedical recordsPatientsTWLLSGWeight dataWeight recurrenceDiverse cohortGastrectomyWeight changeCollateral Benefit of Systematic Improvement in Bariatric Surgery Outcomes Following a Single Quality Improvement Project for Bleeding
Chao G, Nadzam G, Cheung M, Duffy A, Ghiassi S, Morton J. Collateral Benefit of Systematic Improvement in Bariatric Surgery Outcomes Following a Single Quality Improvement Project for Bleeding. Obesity Surgery 2024, 34: 1041-1044. PMID: 38280157, DOI: 10.1007/s11695-023-07037-9.Peer-Reviewed Original ResearchConceptsQuality improvement projectImprovement projectImprove patient careTargeted quality improvement projectsVenous thromboembolism prophylaxisPatient careRoot cause analysisBariatric surgery outcomesIndications conferencePatient outcomesPostoperative complicationsThromboembolism prophylaxisSurgery outcomesStudy aimCause analysisAdverse outcomesBleedingImprove outcomesOutcomesTechnique standardization
2023
Structured Resident Training in Robotic Surgery: Recommendations of the Robotic Surgery Education Working Group
Porterfield J, Podolsky D, Ballecer C, Coker A, Kudsi O, Duffy A, Meara M, Novitsky Y. Structured Resident Training in Robotic Surgery: Recommendations of the Robotic Surgery Education Working Group. Journal Of Surgical Education 2023, 81: 9-16. PMID: 37827925, DOI: 10.1016/j.jsurg.2023.09.006.Peer-Reviewed Original ResearchConceptsEducation Working GroupCurriculum pathwaysSurgical educatorsRobotic surgery educationRobotic surgery training curriculumDay-long meetingEducatorsDigital toolsSurgery educationTraining curriculumCurriculumResident educationAcademic medical institutionsResident programsTraining pathwaysEducationLater careerBest practicesResident trainingRole of the exercise professional in metabolic and bariatric surgery
Stults-Kolehmainen M, Bond D, Richardson L, Herring L, Mulone B, Garber C, Morton J, Ghiassi S, Duffy A, Balk E, Abolt C, Howard M, Ash G, Williamson S, Marcon E, De Los Santos M, Bond S, Huehls J, Alowaish O, Heyman N, Gualano B. Role of the exercise professional in metabolic and bariatric surgery. Surgery For Obesity And Related Diseases 2023, 20: 98-108. PMID: 38238107, PMCID: PMC11311246, DOI: 10.1016/j.soard.2023.09.026.Peer-Reviewed Original ResearchExercise professionalsPhysical activityBariatric surgeryMultidisciplinary careMBS patientsBackground Physical activitySupervision of exerciseLifestyle physical activityPA/exerciseEvidence-based informationSedentary behavior assessmentLong-term healthPhysical fitness assessmentExercise guidelinesExercise prescriptionDietary supportWeight managementExercise physiologistsBehavioral counselingBody compositionPsychosocial supportClinical settingPatientsPA programmingDelphi processRacial differences after bariatric surgery: 24-month follow-up of a randomized, controlled trial for postoperative loss-of-control eating
Ivezaj V, Dilip A, Duffy A, Grilo C. Racial differences after bariatric surgery: 24-month follow-up of a randomized, controlled trial for postoperative loss-of-control eating. Surgery For Obesity And Related Diseases 2023, 20: 261-266. PMID: 37949690, PMCID: PMC10922356, DOI: 10.1016/j.soard.2023.09.017.Peer-Reviewed Original ResearchEating-disorder psychopathologyPercent excess weight lossExcess weight lossPost-bariatric surgeryNon-white patientsWhite patientsEating Disorder Examination-Bariatric Surgery Version interviewGreater percent excess weight lossGreater eating-disorder psychopathologyMonths post-bariatric surgeryWeight lossBDI-II depression scoreLong-term outcomesPost-operative lossRacial differencesAcademic medical centerBeck Depression InventoryBariatric surgeryShort-term findingsControlled TrialsProspective studyMedical CenterDepression scoresBetter outcomesPatientsPredictors of early weight loss in post‐bariatric surgery patients receiving adjunctive behavioural treatments for loss‐of‐control eating
Smith C, Dilip A, Ivezaj V, Duffy A, Grilo C. Predictors of early weight loss in post‐bariatric surgery patients receiving adjunctive behavioural treatments for loss‐of‐control eating. Clinical Obesity 2023, 13: e12603. PMID: 37257889, PMCID: PMC10524670, DOI: 10.1111/cob.12603.Peer-Reviewed Original ResearchConceptsEarly weight lossAdjunctive behavioral treatmentsPost-bariatric surgery patientsEarly weight changeBaseline patient characteristicsSurgery-related variablesMonths of treatmentWeight lossBehavioral treatmentPatient characteristicsSurgery patientsFirst monthWeight changeTime of surgeryWeight gain groupEating-disorder psychopathologyBariatric surgeryMost patientsAdjunctive treatmentBlack patientsPercent weight lossPsychiatric comorbidityClinical variablesTreatment trialsPatientsInformation Technology-Enhanced Telehealth Consultations Reduce Preoperative Evaluation Center Visits in a Bariatric Surgery Population
Zafar J, Chan K, Ryder L, Duffy A, Dai F, Carr Z, Charchaflieh J. Information Technology-Enhanced Telehealth Consultations Reduce Preoperative Evaluation Center Visits in a Bariatric Surgery Population. Healthcare 2023, 11: 309. PMID: 36766884, PMCID: PMC9914614, DOI: 10.3390/healthcare11030309.Peer-Reviewed Original ResearchPreoperative evaluation centerPreoperative evaluation processDay of surgeryQuality of careBariatric surgery patientsPerson patient visitsSecondary outcomesSurgery patientsPrimary outcomePatient visitsBariatric surgery populationRetrospective cohort analysisAppropriate patient selectionPreoperative patient evaluationAcademic health systemAdditional testingSurgery populationPreoperative evaluationPatient selectionPatient evaluationCohort analysisPreoperative processCenter visitsTelehealth consultationsPatient care
2020
S1015 Bariatric Surgery Can Be Performed Safely at Yale-New Haven Hospital in Patients With Cirrhosis
Mankash M, Yousaf M, Duffy A, Mehal W, Do A. S1015 Bariatric Surgery Can Be Performed Safely at Yale-New Haven Hospital in Patients With Cirrhosis. The American Journal Of Gastroenterology 2020, 115: s518-s518. DOI: 10.14309/01.ajg.0000706108.48385.f8.Peer-Reviewed Original ResearchS1189 Incorporation of Obesity Medicine Into the Care of Patients With Nonalcoholic Fatty Liver Disease: 1-Year Interim Results
Mankash M, Kelly M, Duffy A, Mehal W, Do A. S1189 Incorporation of Obesity Medicine Into the Care of Patients With Nonalcoholic Fatty Liver Disease: 1-Year Interim Results. The American Journal Of Gastroenterology 2020, 115: s595-s595. DOI: 10.14309/01.ajg.0000706804.10023.a3.Peer-Reviewed Original Research
Clinical Trials
Current Trials
Treatments to Treat Loss-of-Control Eating and Improve Weight Outcomes after Bariatric Surgery
HIC ID2000029057RoleSub InvestigatorPrimary Completion Date11/30/2027Recruiting Participants
Academic Achievements & Community Involvement
Clinical Care
Overview
Andrew Duffy, MD, is a board certified general surgeon and is fellowship-trained in minimal access surgery. He is associate surgical chief of the Digestive Health Service Line for Yale New Haven Health System (YNHHS) and director of the YNHHS Hernia Program.
His goal is to offer the most effective surgery with the least recovery time and post-operative discomfort.
Dr. Duffy is dedicated to helping individuals with acute and chronic issues with their stomach, intestines, colon, gallbladder, or other abdominal organs. He specializes in all type of primary and recurrent abdominal wall and hiatal hernias. He has extensive experience at surgically treating colon cancer and diverticulitis using laparoscopic techniques.
He also specializes in laparoscopic procedures for obesity, including gastric bypass, sleeve gastrectomy, adjustable gastric banding and revision of prior bariatric surgery.
He specializes in laparoscopic gastrointestinal surgery; laparoscopic colon surgery for colon cancer or diverticulitis; laparoscopic bariatric surgery for morbid obesity; laparoscopic gastric bypass surgery; laparoscopic adjustable gastric banding; laparoscopic sleeve gastrectomy; revisional bariatric surgery; laparoscopic surgery for reflux and achalasia; laparoscopic Nissen, laparoscopic Heller myotomy; laparoscopic splenectomy; laparoscopic paraesophageal hernia repair; laparoscopic repair of abdominal-wall hernias; laparoscopic repair of inguinal hernias; gall bladder; gall stones; cholecystectomy; gall stone pancreatitis; Gastroesophageal Reflux Disease (GERD); Inflammatory Bowel Disease (IBD); Crohn's disease; ulcerative colitis; appendicitis; gastroparesis.
Clinical Specialties
Fact Sheets
Peroral Endoscopic Myotomy (POEM)
Learn More on Yale MedicineRobot-Assisted Heart Surgery
Learn More on Yale MedicineGastric Balloon (Intragastric Balloon)
Learn More on Yale MedicineRevisional Bariatric Surgery
Learn More on Yale Medicine
Board Certifications
Focused Practice in Metabolic Bariatric Surgery
- Certification Organization
- AB of Surgery
- Original Certification Date
- 2023
Surgery General
- Certification Organization
- AB of Surgery
- Latest Certification Date
- 2013
- Original Certification Date
- 2004
Yale Medicine News
News
News
- August 05, 2024
When It Comes To Robotic Surgery, The Future Is Now – And Tomorrow
- May 02, 2024
Yale Surgeons Recognized by Connecticut Magazine's 2024 “Top Doctors” List
- February 22, 2024
National Search for General Surgery Residency Program Director
- May 01, 2023
Connecticut Magazine’s 2023 “Top Doctors” issue recognizes 81 Smilow Cancer Hospital and Yale Cancer Center physicians