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The effect of inpatient stress testing on subsequent emergency department visits, readmissions, and costs.

BACKGROUND: Patients with low-risk chest pain are frequently readmitted for evaluation of recurrent chest pain. It is unknown whether stress testing during the first admission for chest pain is a cost-effective means of reducing readmissions.

METHODS: Using a hospital administrative database, we conducted a retrospective cohort study of patients aged ≥18 years admitted under "observation status" to Baystate Medical Center between January 2007 and July 2009 for chest pain without acute coronary syndrome. We compared subsequent emergency department (ED) visits, readmissions, and costs within 1 year for patients who had a stress test at index admission to those who did not, adjusting for age, gender, race, insurance, and comorbidities.

RESULTS: The cohort included 3315 patients. Most (n = 2376, 71.7%) had a stress test during the index admission. Within 1 year, 256 (7.7%) patients returned to the ED at least once with chest pain. Of these, 112 (43.8%) were admitted during their first return visit. In the multivariable model, return visits for chest pain were negatively associated with previous stress testing (odds ratio [OR]: 0.6, 95% confidence interval [CI]: 0.5 to 0.9). Once in the ED, however, the risk of admission did not vary by stress test during index admission (OR: 0.8, 95% CI: 0.4 to 1.4). Overall costs, including index admission and follow-up visits for chest pain, were higher for patients with stress testing at index admission.

CONCLUSION: Inpatient stress testing reduced subsequent resource utilization in terms of ED visits and resultant readmissions, but the savings were not enough to offset the cost of initial testing.

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