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Ann Thorac Surg 1998;66:860-869
© 1998 The Society of Thoracic Surgeons
a Department of Cardiology, Children’s Hospital, Boston, Massachusetts, USA
b Department of Cardiovascular Surgery, Children’s Hospital, Boston, Massachusetts, USA
c Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
Accepted for publication April 2, 1998.
Address reprint requests to Dr Jenkins, Department of Cardiology, Children’s Hospital, 300 Longwood Ave, Boston, MA 02115
Background. To determine the validity of the newly assigned work relative value unit (RVU) scale for surgical procedures for congenital heart disease, we measured its relationship to length of hospital stay, total hospital charges, and mortality.
Methods. We identified cases by the presence of ICD-9-CM codes in nine statewide, administrative hospital discharge abstract databases for 1992. Computer algorithms were generated to assign RVUs to individual cases. Spearman correlation coefficients between work and practice expense RVUs and median length of hospital stay, total hospital charges, and in-hospital mortality were determined, as well as parameter estimates from linear and logistic regression.
Results. Using data from 5,192 cases involving 34 surgical procedures for congenital heart disease, higher work RVUs were associated with longer lengths of hospital stay (rs = 0.72, p < 0.0001), higher total hospital charges (rs = 0.81, p < 0.0001), and higher in-hospital mortality (rs = 0.45, p = 0.01). A 5-point increase in the relative value scale was associated with an increase in the length of stay by a multiplicative factor of 1.3 (p < 0.0001); total hospital charges by 1.5 (p < 0.0001); and the odds of in-hospital death by 1.9 (p < 0.0001). Findings were similar for practice expense RVUs, as work and practice expense RVUs were highly correlated (rs = 0.93, p < 0.0001).
Conclusions. The group of work RVUs for surgical procedures for congenital heart defects are reasonable relative measures, on average, of physician work for these procedures, thus supporting the use of this scale to determine physician reimbursement. Practice expense RVUs may not be an independent measure for these procedures.
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