EVALUATION STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Patient readmission and mortality after colorectal surgery for colon cancer: impact of length of stay relative to other clinical factors.

BACKGROUND: Data on readmission as well as the potential impact of length of stay (LOS) after colectomy for colon cancer remain poorly defined. The objective of the current study was to evaluate risk factors associated with readmission among a nationwide cohort of patients after colorectal surgery.

STUDY DESIGN: We identified 149,622 unique individuals from the Surveillance, Epidemiology, and End Results-Medicare dataset with a diagnosis of primary colorectal cancer who underwent colectomy between 1986 and 2005. In-hospital morbidity, mortality, LOS, and 30-day readmission were examined using univariate and multivariate logistic regression models.

RESULTS: Primary surgical treatment consisted of right (37.4%), transverse (4.9%), left (10.5%), sigmoid (22.8%), abdominoperineal resection (7.3%), low anterior resection (5.6%), total colectomy (1.2%), or other/unspecified (10.3%). Mean patient age was 76.5 years and more patients were female (52.9%). The number of patients with multiple preoperative comorbidities increased over time (Charlson comorbidity score ≥3: 1986 to 1990, 52.5% vs 2001 to 2005, 63.1%; p < 0.001). Mean LOS was 11.7 days and morbidity and mortality were 36.5% and 4.2%, respectively. LOS decreased over time (1986 to 1990, 14.0 days; 1991 to 1995, 12.0 days; 1996 to 2000, 10.4 days; 2001 to 2005, 10.6 days; p < 0.001). In contrast, 30-day readmission rates increased (1986 to 1990, 10.2%; 1991 to 1995, 10.9%; 1996 to 2000, 12.4%; 2001 to 2005, 13.7%; p < 0.001). Factors associated with increased risk of readmission included LOS (odds ratio = 1.02), Charlson comorbidities ≥3 (odds ratio = 1.27), and postoperative complications (odds ratio = 1.17) (all p < 0.01).

CONCLUSIONS: Readmission rates after colectomies have increased during the past 2 decades and mean LOS after this operation has declined. More research is needed to understand the balance and possible trade off between these hospital performance measures for all surgical procedures.

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