Impact of geographic proximity to cardiac revascularization services on service utilization

BACKGROUND. In a highly competitive health care environment, even microgeog raphic differences in availability of tertiary services might affect access to care. OBJECTIVES. To study the impact of (1) geographic distance from patient's r esidence to cardiac revascularization services and (2) the availability of cardiac revascularization services at the hospital nearest the patient's re sidence on utilization of these services in a geographically small, densely populated area. METHODS. Historical cohort study of 55,659 New Jersey residents hospitalize d between 1992 and 1996 with primary diagnosis of acute myocardial infarcti on (AMI). MAIN STUDY OUTCOMES. Use of percutaneous transluminal coronary angioplasty (PTCA) or coronary artery bypass graft surgery (CABG) within 90 days of ini tial hospitalization for AR IL and in-hospital mortality. Distance from pat ient's residence to nearest hospital with cardiac revascularization service s (PTCA and CABG) was a straight-line distance in miles, categorized as 0 t o <2, 2 to <5, 5 to <10, 10 to <15, 15 to <20, 20 to <25, greater than or e qual to 25 miles. Adjusted odds of PTCA or CABG use at each distance catego ry were compared with odds at greater than or equal to 25 miles. RESULTS. A strong linear decline in adjusted odds ratios for PTCA use was f ound with increasing distance of this service from the patient's residence (p<0.05). Adjusted odds of PTCA use were 2.4, 2.1, 1.8, 1.5, 1.3, and 1.0 t imes higher for each increasing distance category in comparison with greate r than or equal to 25 for patients aged <65 and 3.1, 2.7, 2.2, 1.9, 1.7, an d 1.1 for patients aged greater than or equal to 65. Use of CABG was also h igher for patients residing closer to cardiac revascularization services. T he availability of these services at the hospital nearest to the patient's residence also increased utilization. In-hospital mortality was not associa ted with distance from services. CONCLUSION. Even across a relatively small geographic area, shorter distanc e to services and availability of services at the nearest hospital were str ongly related to increased utilization of cardiac revascularization service s.