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Original Contribution
July 14, 1999

Queuing for Coronary Angiography During Severe Supply-Demand Mismatch in a US Public Hospital : Analysis of a Waiting List Registry

Author Affiliations

Author Affiliations: Department of Internal Medicine, Division of Cardiology, University of Texas Medical Branch at Galveston. Drs Rosanio and Tocchi are now with the division of Cardiology, Hospital S Raffaele, Milan, Italy. Dr Cutler is now with The Heart Group, Akron, Ohio. Dr Garg is now with Cardiac Consultants, Tualarin, Ore.

JAMA. 1999;282(2):145-152. doi:10.1001/jama.282.2.145
Abstract

Context  Adverse cardiac events have been reported in patients waiting for either coronary surgery or angioplasty. However, data on the risk of adverse events while awaiting coronary angiography are limited, and none are available from a US population.

Objective  To quantify cardiac outcomes in patients waiting for elective coronary angiography.

Design, Setting, and Participants  Observational cohort study of 381 adult outpatients (mean [SD] age, 55 [12] years; 64% male; 61% white) on a waiting list for coronary angiography at a US tertiary care public teaching hospital during 1993-1994.

Main Outcome Measures  Rates of cardiac death, nonfatal myocardial infarction, and hospitalizations for unstable angina or heart failure as a function of amount of time spent on a waiting list.

Results  Sixty-six patients were dropped from the waiting list but were included in the study analysis. During a mean (SD) follow-up of 8.4 (6.5) months, cardiac death, myocardial infarction, and hospitalization occurred in 6 (1.6%), 4 (1.0%), and 26 (6.8%) patients, respectively. The probability of events was minimal in the first 2 weeks and increased steadily between 3 and 13 weeks. By Cox multivariate analysis, 2 variables independently identified an increased risk of adverse events: a strongly positive treadmill exercise electrocardiogram or positive stress imaging result at referral (odds ratio [OR], 2.32; 95% confidence interval [CI], 1.22-4.16; P=.01) and the use of 2 to 3 anti-ischemic medications (OR, 1.98; 95% CI, 1.19-3.96; P=.04). Among 311 patients who ultimately underwent angiography, those with adverse events had a higher prevalence of coronary disease (96% vs 60%; P<.001), more frequently required revascularization (93% vs 53%; P<.001), and had longer hospital stays (mean [SD], 6.2 [4.3] vs 1.3 [0.7] days; P=.001).

Conclusion  Our data suggest that in a cohort referred for coronary angiography, delaying the procedure places some patients at risk for death, myocardial infarction, unplanned hospitalization, a longer hospital stay, and, potentially, a poorer prognosis. Waits longer than 2 weeks should be avoided, and patients with strongly positive stress test results and those who require 2 to 3 anti-ischemic medications should be prioritized for early intervention.

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