CLINICAL RESEARCH: HYPERTROPHIC AND DILATED CARDIOMYOPATHY
Long-Term Effects of Surgical Septal Myectomy on Survival in Patients With Obstructive Hypertrophic Cardiomyopathy
Steve R. Ommen, MD, FACC*,*,
Barry J. Maron, MD, FACC*, ,
Iacopo Olivotto, MD ,
Martin S. Maron, MD||,
Franco Cecchi, MD,
Sandro Betocchi, MD, FACC¶,
Bernard J. Gersh, MB, ChB, DPhil, FACC*,
Michael J. Ackerman, MD, PhD, FACC*,
Robert B. McCully, MB, ChB, FACC*,
Joseph A. Dearani, MD ,
Hartzell V. Schaff, MD, FACC,
Gordon K. Danielson, MD, FACC,
A. Jamil Tajik, MD, FACC* and
Rick A. Nishimura, MD, FACC*
* Division of Cardiovascular Diseases, Mayo Clinic College of Medicine, Rochester, Minnesota
Cardiac Surgery, Mayo Clinic College of Medicine, Rochester, Minnesota
Hypertrophic Cardiomyopathy Center, Minneapolis Heart Institute Foundation, Minneapolis, Minnesota
Regional Referral Center for Myocardial Diseases, Azienda Ospedaliera Careggi, Florence, Italy
|| Hypertrophic Cardiomyopathy Center, Division of Cardiology, Tufts-New England Medical Center, Boston, Massachusetts
¶ Department of Clinical Medicine, Cardiovascular and Immunological Sciences, Federico II University of Naples, Naples, Italy.
Manuscript received September 30, 2004;
revised manuscript received February 1, 2005,
accepted February 14, 2005.
* Reprint requests and correspondence: Dr. Steve R. Ommen, Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905. (Email: ommen.steve{at}mayo.edu).
OBJECTIVES: This study sought to determine the impact of surgical myectomy on long-term survival in hypertrophic cardiomyopathy (HCM).
BACKGROUND: Left ventricular (LV) outflow tract obstruction in HCM increases the likelihood of heart failure and cardiovascular death. Although surgical myectomy is the primary treatment for amelioration of outflow obstruction and advanced drug-refractory heart failure symptoms, its impact on long-term survival remains unresolved.
METHODS: Total and HCM-related mortality were compared in three subgroups comprised of 1,337 consecutive HCM patients evaluated from 1983 to 2001: 1) surgical myectomy (n = 289); 2) LV outflow obstruction without operation (n = 228); and 3) nonobstructive (n = 820). Mean follow-up duration was 6 ± 6 years.
RESULTS: Including two operative deaths (procedural mortality, 0.8%), 1-, 5-, and 10-year overall survival after myectomy was 98%, 96%, and 83%, respectively, and did not differ from that of the general U.S. population matched for age and gender (p = 0.2) nor from patients with nonobstructive HCM (p = 0.8). Compared to nonoperated obstructive HCM patients, myectomy patients experienced superior survival free from all-cause mortality (98%, 96%, and 83% vs. 90%, 79%, and 61%, respectively; p < 0.001), HCM-related mortality (99%, 98%, and 95% vs. 94%, 89%, and 73%, respectively; p < 0.001), and sudden cardiac death (100%, 99%, and 99% vs. 97%, 93%, and 89%, respectively; p = 0.003). Multivariate analysis showed myectomy to have a strong, independent association with survival (hazard ratio 0.43; p < 0.001).
CONCLUSIONS: Surgical myectomy performed to relieve outflow obstruction and severe symptoms in HCM was associated with long-term survival equivalent to that of the general population, and superior to obstructive HCM without operation. In this retrospective study, septal myectomy seems to reduce mortality risk in severely symptomatic patients with obstructive HCM.
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Abbreviations and Acronyms
| | HCM = hypertrophic cardiomyopathy | | LV = left ventricle/ventricular | | NYHA = New York Heart Association |
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