Multiple Arterial Bypass Grafting Should Be Routine Robert F Tranbaugh, David J Lucido, Kamellia R Dimitrova, Darryl M Hoffman, Charles M Geller, John.

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Presentation transcript:

Multiple Arterial Bypass Grafting Should Be Routine Robert F Tranbaugh, David J Lucido, Kamellia R Dimitrova, Darryl M Hoffman, Charles M Geller, John D Puskas Department of Cardiovascular Surgery, Mount Sinai Beth Israel, New York, NY Presented at the American Association for Thoracic Surgery Annual meeting, Seattle, WA April 25-29, 2015

Disclosures: None

MABG Should Be Routine: Background Adding a 2 nd arterial graft during CABG improves long term survival.¹⁻³ Either the radial artery (RA) or the right internal thoracic artery (RITA) may be used.⁴ Yet, use of a 2 nd arterial graft is 10% (RITA 4% and RA 6%) in the U.S.⁵ What is potential survival benefit of “routine” multiple arterial grafting? 1.Halkos, JTCVS, Taggart, Euro Heart J, Schwann, Ann Thorac Surg, Tranbaugh, JTCVS, Head, Euro Heart J, 2013

Non-compliance with Guidelines Costs Lives Implementation of 2014 hypertension guidelines in U.S. adults between 35 and 74 years. Potentially could prevent 13,000 deaths annually. N Eng J Med. Jan, 2015.

MABG Should Be Routine: Objectives To estimate the reduction in deaths and number of additional person years of life that could potentially be gained by nationwide adoption of routine multiple arterial bypass grafting (MABG). To define an achievable and optimal MABG rate.

MABG Should Be Routine: Methods 4,883 consecutive, isolated CABG-LITA procedures from January, 1995 to June, RA: 1,965 patients; SV: 2,918 patients. Propensity matching on 31 prospectively collected variables resulted in 1002 matched RA and SV pairs. Kaplan Meier estimates of survival. Primary endpoints: all cause mortality using the SSDI (10/2012).

MABG Should Be Routine: Statistical Methods Evaluated 2 rates of MABG—20% and 80%--and compared these to the current national rate of 10%. Applied these MABG rates to a hypothetical population of 200,000 patients similar to our propensity matched patients (2010: 395,000 CABG in U.S.). Calculated the potential number of lives saved and the number of added person years of life based on the Kaplan Meier survival estimates.

MABG Should Be Routine: Results Propensity matched 1002 RA and 1002 SV pairs: Age: 62 years Male: 75% Diabetic: 40% 3VD: 80% Mean # of grafts: 3.7/patient

Kaplan Meier Survival Curves: Unmatched patients

Kaplan Meier Survival Curves: Matched Patients

MABG 20,000 (10%) SITA 180,000 (90%) 16,660 alive 135,000 alive 200,000 patients Present Reality in USA 151,660 alive at 10 yrs 83.3% 75.0% 10 years

MABG 160,000 (80%) SITA 40,000 (20%) 133,280 alive 30,000 alive 200,000 patients (80% MABG strategy) 163,280 Alive at 10 yrs 83.3% 75.0% 10 years Δ=11,620 Fewer deaths

MABG should be routine: Results Time after CABG Kaplan Meier RA survival rate Kaplan Meier SV survival rate Patients at risk RA 10% Patients at risk RA 20% Patients at risk RA 80% Reduction in RA Reduction in RA Cumulative person- 20% RA Cumulative person- 80% RA 1 year98.5%98.0%196,100196,200196, years 93.5%89.1%179,080179,960185, ,1602,45017, years 83.3%75.0%151,660153,320163,280 1,660 11,6209,19064,330

Radial Artery Utilization: Mount Sinai Heart at Beth Israel

MABG Should Be Routine: Limitations Retrospective study with patient selection bias Propensity matching was thorough but there remains the possibility of uncontrolled confounding effects Model and assumptions may not be applicable to all patients Only all cause mortality was available

MABG Should Be Routine: Summary RA-based MABG strategy could potentially prevent over 11,000 deaths annually in the USA. Over the course of 10 years, over 64,000 person years of life may be added. An 80% rate of multiple arterial grafting is achievable using a RA-based multiple arterial grafting strategy.

MABG Should Be Routine: Conclusions Multiple arterial grafting should be routine during CABG in the majority of patients with the appropriate age, anatomy and clinical indications. RA grafting should be more widely utilized to achieve a rate of 80% MABG use (which may define an coronary arterial grafting reference center).