Britt Tonnessen, MD
Associate Professor of Surgery (Vascular)Cards
About
Research
Publications
2026
Risk Factors for Delirium after Abdominal Aortic Aneurysm Repair
Li J, Slade M, Ferrante L, Tonnessen B, Dardik A, Cardella J, Ochoa Chaar C. Risk Factors for Delirium after Abdominal Aortic Aneurysm Repair. Annals Of Vascular Surgery 2026, 129: 265-274. PMID: 41935823, DOI: 10.1016/j.avsg.2026.03.055.Peer-Reviewed Original ResearchAssociated with deliriumAAA repairOpen repairBleeding riskAbdominal aortic aneurysm (AAA) repairAmerican College of Surgeons National Surgical Quality Improvement ProgramSurgeons National Surgical Quality Improvement ProgramAmerican CollegeAbdominal aortic aneurysm repairNational Surgical Quality Improvement ProgramRisk factorsPerioperative careSurgical Quality Improvement ProgramLower body mass indexACS-NSQIP databaseOpen AAA repairAortic aneurysm repairIntact AAA repairDelirium prevention bundleBody mass indexOlder ageUnderreported complicationsQuality Improvement ProgramEndovascular repairAneurysm repairFrailty is associated with increased risk for upper arm arteriovenous fistula abandonment
Li J, Kumi M, Loh S, Aboian E, Ochoa Chaar C, Tonnessen B. Frailty is associated with increased risk for upper arm arteriovenous fistula abandonment. Journal Of Vascular Surgery 2026 PMID: 41866096, DOI: 10.1016/j.jvs.2026.03.436.Peer-Reviewed Original ResearchAutogenous arteriovenous fistulaComposite poor outcomeRetrospective chart reviewPoor outcomeFive-factor modified frailty indexMFI-5Retrospective chart review of patientsMaturation outcomesChart review of patientsAutogenous arteriovenous fistula creationAcademic tertiary referral centerEnd-stage renal disease patientsReview of patientsTertiary referral centerNon-maturationHigher frailtyMultivariate logistic regression modelSevere frailtyAVF abandonmentChronic obstructive pulmonary diseaseRenal disease patientsObstructive pulmonary diseaseImpact of frailtyFistula abandonmentUnassisted maturationSmoking cessation after Lower Extremity Revascularization in the Vascular Quality Initiative
Carter W, Schwartz A, Zwibelman H, Aboian E, Tonnessen B, Cardella J, Guzman R, Ochoa Chaar C. Smoking cessation after Lower Extremity Revascularization in the Vascular Quality Initiative. Journal Of Vascular Surgery 2026 PMID: 41825793, DOI: 10.1016/j.jvs.2026.03.006.Peer-Reviewed Original ResearchLower extremity bypassLower extremity revascularizationPeripheral vascular interventionsSmoking cessation effortsSmoking cessationCessation effortsPeripheral arterial diseaseCurrent smokersDisadvantaged neighborhoodsEndovascular lower extremity revascularizationSocioeconomically disadvantaged neighborhoodsHigher rates of adverse outcomesInfrainguinal bypassExtremity revascularizationProportion of smokersSurvival analysisRates of adverse outcomesLong-term outcomesVascular Quality InitiativePercentage of active smokersSociety for Vascular SurgeryLower-extremity revascularizationStop smokingHigher RatesSmoking statusThe Best of 2025 - Peripheral and Splanchnic Aneurysms and Mesenteric Vascular Disease
Tonnessen B. The Best of 2025 - Peripheral and Splanchnic Aneurysms and Mesenteric Vascular Disease. Journal Of Vascular Surgery Cases And Innovative Techniques 2026, 102231. DOI: 10.1016/j.jvscit.2026.102231.Commentaries, Editorials and LettersInfrainguinal bypass with alternative conduits in diabetic patients with chronic limb-threatening ischemia
Williams Z, Pinto-Rodriguez P, Zwibelman H, Strosberg D, Aboian E, Tonnessen B, Ochoa Chaar C, Cardella J. Infrainguinal bypass with alternative conduits in diabetic patients with chronic limb-threatening ischemia. Journal Of Vascular Surgery 2026, 83: 1553-1565. PMID: 41654038, DOI: 10.1016/j.jvs.2026.01.037.Peer-Reviewed Original ResearchChronic limb-threatening ischemiaGreat saphenous veinGreat saphenous vein groupsDiabetes mellitusAmputation-free survivalInfrainguinal bypassLimb-threatening ischemiaAlternative conduitVascular Quality Initiative databaseRates of amputation-free survivalLong-term freedomOutcomes of patientsKaplan-Meier analysisAmputation-free survival rateAutologous great saphenous veinVascular Quality InitiativeAcceptable limb salvageAdverse limb eventsMultivariate regression analysisPerioperative mortalityInferior outcomesSurgical revascularizationBaseline characteristicsGraft occlusionKaplan-Meier
2025
Letter regarding “Vascular Procedures Are Increasingly Performed By Women”
Nasir A, Loh S, Tonnessen B. Letter regarding “Vascular Procedures Are Increasingly Performed By Women”. Journal Of Vascular Surgery 2025, 82: 1917-1918. PMID: 41110861, DOI: 10.1016/j.jvs.2025.07.039.Commentaries, Editorials and LettersPreoperative smoking cessation impacts presentation and neurologic outcomes of carotid endarterectomy
Schwartz A, Carter W, Tonnessen B, Arhuidese I, Cardella J, Dardik A, Ochoa Chaar C. Preoperative smoking cessation impacts presentation and neurologic outcomes of carotid endarterectomy. Journal Of Vascular Surgery 2025, 83: 461-470.e6. PMID: 40992521, DOI: 10.1016/j.jvs.2025.09.032.Peer-Reviewed Original ResearchVascular Quality InitiativeTransient ischemic attackSmoking cessation durationLong-term outcomesChronic obstructive pulmonary diseaseCessation durationCarotid endarterectomyNeurological outcomeNeurological eventsFollow-upFormer smokersCurrent smokersGroup of former smokersStatistically significant risk reductionDuration of smoking cessationSmoking cessationKaplan-Meier analysisOutcomes of carotid endarterectomyIpsilateral neurologic eventsSignificant risk reductionChronic kidney diseaseDuration of quittingAssociated with outcomeObstructive pulmonary diseasePerioperative mortalitySmoking cessation duration is associated with the risk of amputation after revascularization for chronic limb-threatening ischemia
Carter W, Schwartz A, Sumpio B, Strosberg D, Tonnessen B, Cardella J, Guzman R, Ochoa Chaar C. Smoking cessation duration is associated with the risk of amputation after revascularization for chronic limb-threatening ischemia. Journal Of Vascular Surgery 2025, 83: 256-264.e2. PMID: 40912340, DOI: 10.1016/j.jvs.2025.08.037.Peer-Reviewed Original ResearchChronic limb-threatening ischemiaCurrent smokersFormer smokersSmoking cessationMajor amputationLower extremity revascularizationCessation durationLimb-threatening ischemiaDuration of smoking cessationQuality InitiativeStandardized follow-up periodsRisk of amputationSmoking cessation durationVascular Quality InitiativeFormer smokingCurrent smokingPerioperative outcomesBlack racePeripheral vascular interventionsAmputationSmokingEnd-stage renal diseaseMonths of surgeryKaplan-Meier analysisFollow-up periodTiming of outpatient stenting is associated with stent size in nonthrombotic iliac vein lesions
Schultz K, Rodriguez P, Ali S, Attaran R, Lozada J, Huber S, Tonnessen B, Aboian E, Guzman R, Chaar C. Timing of outpatient stenting is associated with stent size in nonthrombotic iliac vein lesions. Journal Of Vascular Surgery Venous And Lymphatic Disorders 2025, 14: 102303. PMID: 40850563, PMCID: PMC12495162, DOI: 10.1016/j.jvsv.2025.102303.Peer-Reviewed Original ResearchNonthrombotic iliac vein lesionsIliac vein lesionsVein lesionsLate cohortStent sizeStent placementRetrospective studyRetrospective study of patientsMultivariate logistic regression analysisTime of stentingIliac vein stentingDay of surgeryStudy of patientsFirst-time treatmentEarly cohortMultivariate logistic regressionLogistic regression analysisIntravascular ultrasound examinationVein stentingVenous stentingStenting timeBaseline characteristicsUltrasound examinationVolume deficitsSmall stentsFrailty and functional decline after elective endovascular abdominal aortic aneurysm repair in octogenarians
Li J, Slade M, Gill T, Bader J, Guzman R, Tonnessen B, Kuwayama D, Dardik A, Cardella J, Ochoa Chaar C. Frailty and functional decline after elective endovascular abdominal aortic aneurysm repair in octogenarians. Journal Of Vascular Surgery 2025, 83: 79-90.e2. PMID: 40835162, PMCID: PMC13005939, DOI: 10.1016/j.jvs.2025.08.011.Peer-Reviewed Original ResearchElective endovascular abdominal aortic aneurysm repairEndovascular abdominal aortic aneurysm repairAbdominal aortic aneurysm repairAortic aneurysm repairModified Frailty IndexFollow-upRisk Analysis IndexRisk factorsAneurysm repairValidation cohortDevelopment cohortEastern Cooperative Oncology Group performance statusAsymptomatic infrarenal abdominal aortic aneurysmFunctional declineInfrarenal abdominal aortic aneurysmVascular Quality Initiative (VQI) databaseFrailty assessmentCongestive heart failureAbdominal aortic aneurysmLong-term mortality riskChronic obstructive pulmonary diseaseFrailty indexObstructive pulmonary diseasePreoperative factorsPreoperative comorbidities
Clinical Trials
Current Trials
Drug-Eluting Registry: Real-World Treatment of Lesions in the Peripheral Vasculature (ELEGANCE)
IRB ID2000031921REGRoleSub InvestigatorPrimary Completion Date01/01/2028Recruiting ParticipantsGenderBothAge18+ years
Academic Achievements & Community Involvement
Clinical Care
Overview
Britt H. Tonnessen, MD, FACS is a vascular surgeon who treats patients with a variety of conditions that affect the arteries and veins, including carotid disease, peripheral vascular disease, venous disease, and thoracic outlet syndrome. As a vascular expert, she cares for older patients with hardening of the arteries, as well as younger patients who may develop different types of problems, such as varicose veins or chronic wounds on the legs.
Dr. Tonnessen says the decision to become a doctor came naturally to her. “I wanted to help people. It's as simple as that.” She was inspired by excellent mentorship and early exposure to vascular surgery as a medical student at the Mayo Clinic in the 1990s.
She ultimately became a vascular surgeon for three reasons. “One, you have continuity of patient care over time—these are patients you follow for many years. Two, the science behind the work I do is logical and interesting. Three, minimally invasive “endovascular” techniques have really revolutionized the field," she says. "When I was an intern, all of the patients had large incisions on their abdomens. Traditional surgery is still appropriate for some, but now we can do many procedures through a small puncture in the groin or even in the foot.”
Vascular surgery can be demanding, but there are many rewards, Dr. Tonnessen says. “It's so gratifying for me to get a cold foot back to a warm foot (because circulation has improved), to relieve pain for someone whose leg has been swollen for years, or to repair someone's potentially life-threatening aneurysm through a couple of small groin punctures," she says. "In medicine, we're never looking for a thank you, but the satisfaction from patients whose lives were transformed has made it all worthwhile.”
Clinical Specialties
Fact Sheets
Vascular Surgery
Learn More on Yale MedicineThoracic Outlet Syndrome
Learn More on Yale MedicinePeripheral Vascular Disease (PVD)
Learn More on Yale MedicinePreparing for Dialysis (AV Fistula)
Learn More on Yale Medicine
Board Certifications
Vascular Surgery
- Certification Organization
- AB of Surgery
- Original Certification Date
- 2008
Yale Medicine News
News
News
- May 18, 2026Source: Good Housekeeping UK Online with Dr. Britt Tonneson
10 common causes of swollen feet or ankles
- May 11, 2026Source: Prevention Health
Doctors Explain Why Your Feet and Ankles Are Swollen
- June 17, 2024Source: Yale Medicine
Blood Clots, Varicose Veins, and Sore Legs: Can Compression Socks Help?
- March 08, 2023Source: Yale Medicine
Anesthesia, Opioids, and Anxiety: Your Pre-Surgery Questions Answered
Get In Touch
Contacts
Vascular Surgery & Endovascular Therapy
330 Cedar Street, Boardman 204
New Haven, CT 06510
United States
Administrative Support
Locations
Patient Care Locations
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Events
Organization Only Robert Becher, MD, MS, FACS - Jonathan Cardella, MD, FRCS - Sajid A Khan, MD, FACS, FSSO - Joseph Santos-Sacchi, PhD - Britt Tonnessen, MD - Nwanmegha Young, MD