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Original Investigation
July 2017

Association Between Hospital Volume and 30-Day Readmissions Following Transcatheter Aortic Valve Replacement

Author Affiliations
  • 1New York Medical College, Valhalla
  • 2Brown University, Providence, Rhode Island
  • 3Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, New York
  • 4Houston Methodist DeBakey Heart and Vascular Center, Houston Methodist Hospital, Houston, Texas
  • 5Weill Cornell Medical College, New York, New York
  • 6Mount Sinai Health System, New York, New York
  • 7University of California–Los Angeles
  • 8Associate Editor for Health Care Quality and Guidelines, JAMA Cardiology
  • 9Brigham and Women’s Hospital Heart & Vascular Center, Harvard Medical School, Boston, Massachusetts
JAMA Cardiol. 2017;2(7):732-741. doi:10.1001/jamacardio.2017.1630
Key Points

Question  Is there an association between hospital transcatheter aortic valve replacement (TAVR) volume and 30-day readmission rate?

Findings  This observational study found that high-volume TAVR hospitals had significantly lower 30-day readmission rates compared with medium- and low-volume TAVR hospitals.

Meaning  There exists an inverse association between hospital TAVR volume and 30-day readmission rates.

Abstract

Importance  With the approval of transcatheter aortic valve replacement (TAVR) for patients with severe symptomatic aortic stenosis at intermediate surgical risk, TAVR volume is projected to increase exponentially in the United States. The 30-day readmission rate for TAVR was recently reported at 17.9%. The association between institutional TAVR volume and the 30-day readmission metric has not been examined.

Objective  To assess the association between hospital TAVR volume and 30-day readmission.

Design, Setting, and Participants  In this observational study, we used the 2014 Nationwide Readmissions Database to identify hospitals with established TAVR programs (performing at least 5 TAVRs in the first quarter of 2014). Based on annual TAVR volume, hospitals were classified as low (<50), medium (≥50 to <100), and high (≥100) volume. Rates, causes, and costs of 30-day readmissions were compared between low-, medium-, and high-volume hospitals. Data were analyzed from November to December 2016.

Exposure  Transcatheter aortic valve replacement.

Main Outcomes and Measures  Thirty-day readmissions.

Results  Of 129 hospitals included in this study, 20 (15.5%) were categorized as low volume, 47 (36.4%) as medium volume, and 62 (48.1%) as high volume. Of 16 252 index TAVR procedures, 663 (4.1%), 3067 (18.9%), and 12 522 (77.0%) were performed at low-, medium-, and high-volume hospitals, respectively. Thirty-day readmission rates were significantly lower in high-volume compared with medium-volume (adjusted odds ratio, 0.76; 95% CI, 0.68-0.85; P < .001) and low-volume (adjusted odds ratio, 0.75; 95% CI, 0.60-0.92; P = .007) hospitals. Noncardiac readmissions were more common in low-volume hospitals (65.6% vs 60.6% in high-volume hospitals), whereas cardiac readmissions were more common in high-volume hospitals (39.4% vs 34.4% in low-volume hospitals). There were no significant differences in length of stay and costs per readmission among the 3 groups (mean [SD], 5.5 [5.0] days vs 5.9 [7.5] days vs 6.0 [5.8] days; P = .74, and $13 886 [18 333] vs $14 135 [17 939] vs $13 432 [15 725]; P = .63, respectively).

Conclusions and Relevance  We report for the first time, to our knowledge, an inverse association between hospital TAVR volume and 30-day readmissions. Lower readmission at higher-volume hospitals was associated with significantly lower cost to the health care system.

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