on August 9, 2004
Published online before print August 9, 2004, doi: 10.1161/01.CIR.0000138744.13516.B5
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Submitted on November 14, 2003
From University at Albany (C.W., E.L.H.), State University of New York, Albany, NY; Boston University School of Medicine (T.J.R.), Boston, Mass; St. Peter’s Hospital (E.B.), Albany, NY; New York University Medical Center (A.T.C.), New York, NY; Montefiore Medical Center (J.P.G.), Bronx, NY; New York Hospital-Cornell (O.W.I.), New York, NY; Duke University Medical Center (R.H.J.), Durham, NC; Harvard Medical School (B.M.), Boston, Mass; Columbia-Presbyterian Medical Center (E.A.R.), New York, NY; and Lenox Hill Hospital (V.A.S.), New York, NY. * To whom correspondence should be addressed. E-mail: ctw09{at}health.state.ny.us.
Background--Restriction of volume-based referral for CABG surgery to high-risk patients has been suggested, and earlier studies have reached different conclusions regarding volume-based referral for low-risk patients. Methods and Results--Patients who underwent isolated CABG surgery in New York from 1997 through 1999 (n=57 150) were separated into low-risk and moderate-to-high-risk groups with a predicted probability of in-hospital death of 2% as the cutoff point. The provider volume-mortality relationship was examined for both groups. For annual hospital volume thresholds between 200 and 600 cases, the adjusted ORs of in-hospital mortality for high-volume to low-volume hospitals ranged from 0.45 to 0.77 and were all significant for the low-risk group; for the moderate-to-high-risk group, ORs ranged from 0.62 to 0.91, and most were significant. The number needed to treat at higher-volume hospitals to avoid 1 death was greater for the low-risk group (a range of 114 to 446 versus 37 to 184). As the annual surgeon volume threshold increased from 50 to 150 cases, the ORs for high- to low-volume surgeons increased from 0.43 to 0.74 for the low-risk group; for the moderate-to-high-risk group, ORs ranged from 0.79 to 0.86. Compared with patients treated by surgeons with volumes of <125 in hospitals with volumes of <600, patients treated by higher-volume surgeons in higher-volume hospitals had a significantly lower risk of death; in particular, the OR was 0.52 for the low-risk group. Conclusions--For both low-risk and moderate-to-high-risk patients, higher provider volume is associated with lower risk of death.
Revised on April 13, 2004
Accepted on April 15, 2004
Is the Impact of Hospital and Surgeon Volumes on the In-Hospital Mortality Rate for Coronary Artery Bypass Graft Surgery Limited to Patients at High Risk?
Chuntao Wu MD, PhD*,
Key words: bypass • mortality • risk factors
Related Article:
Circulation 2004 110: 765.
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