The study’s lead author is Joanna Chikwe, MD, Professor of Cardiovascular Surgery at the Icahn School of Medicine at Mount Sinai.
The study found that among surgeons who performed any mitral valve procedures, the median volume was 10 cases per year, with a mean repair rate of 55 percent. In the subgroup of patients with degenerative disease, the mean repair rate ranged from 77 percent for surgeons with total annual volumes of more than 51 cases, to 48 percent for surgeons who performed fewer than 10 cases.
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Higher total annual surgeon volume was associated with increased repair rates of 1.13 for every additional 10 mitral cases, a steady decrease in reoperation risk until 25 mitral cases annually, and improved survival for every 10 additional cases. The study analyzed 5,475 adult patients 18 years or older who underwent primary mitral valve surgery in New York State between 2002 and 2013.
Sixty-seven percent underwent mitral valve repair and 33 percent received mitral valve replacement. Researchers compared repair rates, long-term survival, and risk of post-repair operation in a subgroup of patients with degenerative disease according to total annual surgeon volume, which was defined as any mitral valve operation for any cause during the study period. A total of 313 surgeons from 41 institutions met the study’s criteria.
Researchers also observed significant differences in the characteristics of patients across each surgeon’s case volume groups. The prevalence of congestive heart failure was significantly higher in patients operated on by surgeons with lower annual case volumes, compared with surgeons with higher annual case volumes.
“There is now a fair amount of medical literature supporting the case that high volumes generally lead to better surgical outcomes, in a wide variety of fields,” said Dr. Chikwe. “This study shows that for patients undergoing mitral surgery, both immediate and subsequent outcomes" were influenced by the individual surgeon’s experience.”
About the Mount Sinai Health System
The Mount Sinai Health System is an integrated health system committed to providing distinguished care, conducting transformative research, and advancing biomedical education. Structured around seven hospital campuses and a single medical school, the Health System has an extensive ambulatory network and a range of inpatient and outpatient services—from community-based facilities to tertiary and quaternary care.
