• S D Pearson, T H Lee, E Lindsey, T Hawkins, E F Cook, and L Goldman.
• Department of Ambulatory Care and Prevention, Harvard Community Health Plan, Boston, MA.
• Health Serv Res. 1994 Apr 1;29(1):59-74.

ObjectiveWe evaluate the impact of membership in a staff-model health maintenance organization (HMO) on hospital admission rates for patients presenting to an emergency department with acute chest pain.Data Sources And Study SettingPrimary prospective data were gathered from all 3,006 patients presenting with a chief complaint of chest pain to the emergency department (ED) of a university teaching hospital from October 1987 to November 1989.Study DesignProspective cohort analysis used clinical data to stratify patients into groups at high (> or = 25%), medium (8-24%), and low risk (< or = 7%) of acute myocardial infarction (AMI). Insurance status was determined as either HMO, Medicare, commercial, Medicaid, or self-pay. Triage decisions were recorded, and patient outcomes of AMI and other final diagnoses were determined for all patients.Data Collection MethodsClinical data were recorded by the physicians in the ED as part of a detailed protocol. Insurance data were recorded separately by the ED staff as part of the hospital administrative database. Patient outcomes were recorded daily by research nurses for hospitalized patients; for patients who were discharged from the ED, telephone or physician follow-up was accomplished within seven days after discharge.Principal FindingsHMO patients were more likely to be admitted to the hospital than patients in other insurance groups in both the medium- and low-risk patient categories. Within the low-risk category, after controlling for clinical differences in a multiple logistic model, HMO membership retained an independent positive association with hospital admission compared to all other insurance groups except Medicaid.ConclusionsFor patients with acute chest pain who were at medium and low risk of acute myocardial infarction, HMO membership was associated with higher rates of hospital admission. These findings suggest that organizational factors beyond financial incentives may exercise an important influence on hospitalization rates for HMO patients.

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