Abstract
Study objective:To determine whether information from a prior electrocardiogram (ECG) improves diagnostic accuracy in the emergency department (ED) evaluation of patients with acute chest pain.
Design:Analysis of prospectively collected data from a cohort study.
Setting:Emergency departments of four community and three university hospitals.
Patients:5,673 patients aged ≥30 years who presented to the EDs of participating hospitals for evaluation of acute chest pain, including 772 (14%) with acute myocardial infarction (AMI).
Measurements and main results:After adjusting for clinical characteristics, no significant difference was found in the sensitivities of admission to the hospital or to the coronary care unit (CCU) between AMI patients with and without prior ECGs available for review. However, non-AMI patients with prior ECGs available for review were more likely to avoid CCU admission than were non-AMI patients without prior ECGs. This improvement in specificity was most marked in the 2,024 patients whose current ED ECGs had changes consistent with ischemia or infarction: when a prior ECG was available, non-AMI patients were more than twice as likely to be discharged (26% vs. 12%) and about 1.5 times as likely to avoid CCU admission (39% vs. 27%) (both p<0.0001). Admission rates of AMI patients with and without prior ECGs were similar.
Conclusion:When the current ECG is consistent with ischemia or infarction, the availability of a prior ECG for comparison to determine whether the ECG changes are old or new improves diagnostic accuracy and triage decisions by reducing the admission of patients without AMI or acute ischemic heart disease (increased specificity) without reducing the admission of patients with these diagnoses (unchanged sensitivity).
Similar content being viewed by others
References
Goldman L, Weinberg M, Weisberg MC, et al. A computer-derived protocol to aid in the diagnosis of emergency room patients with acute chest pain. N Engl J Med. 1982;307:588–96.
Goldman L, Cook EF, Brand DA, et al. A computer protocol to predict myocardial infarction in emergency department patients with chest pain. N Engl J Med. 1988;318:797–802.
Pozen MW, D’Agostino RB, Selker HP, Sytkowski PA, Hood WB. A predictive instrument to improve coronary-care-unit admission practices in acute ischemic heart disease. A prospective multicenter clinical trial. N Engl J Med. 1984;310:1273–8.
Rubenstein LZ, Greenfield S. The baseline ECG in the evaluation of acute cardiac complaints. JAMA. 1980;244:2536–9.
Hoffman JR, Igarashi E. Influence of electrocardiographic findings on admission decisions in patients with acute chest pain. Am J Med. 1985;79:699–707.
Lee TH, Cook EF, Weisberg MC, Sargent RK, Wilson C, Goldman L. Acute chest pain in the emergency room. Identification and examination of low-risk patients. Arch Intern Med. 1985;145:65–9.
Lee TH, Rouan GW, Weisberg MC, et al. Sensitivity of routine clinical criteria for diagnosing myocardial infarction within 24 hours of hospitalization. Ann Intern Med. 1987;106:181–6.
Lee TH, Weisberg M, Cook EF, Daley K, Brand DA, Goldman L. Evaluation of creatine kinase and creatine kinase-MB for diagnosing myocardial infarction. Clinical impact in the emergency room. Arch Intern Med. 1987;147:115–21.
Lee TH, Cook EF, Weisberg MC, Brand DA, Rouan GW, Goldman L. Candidates for thrombolysis among emergency department patients with acute chest pain: the Multicenter Chest Pain Study experience. Ann Intern Med. 1989;110:957–62.
Solomon CG, Lee TH, Cook EF, et al. Comparison of clinical presentation of acute myocardial infarction in patients older than 65 years of age to younger patients: the Multicenter Chest Pain Study experience. Am J Cardiol. 1989;63:772–6.
Beamer AD, Lee TH, Cook EF, et al. Diagnostic implications of the circadian variation of the onset of chest pain. Am J Cardiol. 1987;60:998–1002.
Cunningham MA, Lee TH, Cook EF, et al. The effect of gender on the probability of myocardial infarction among emergency department patients with acute chest pain. J Gen Intern Med. 1989;4:392–8.
White LD, Lee TH, Cook EF, et al, and the Chest Pain Study Group. Comparison of the natural history of new onset and exacerbated chronic ischemic heart disease. J Am Coll Cardiol (in press).
Miettinen OS, Cook EF. Confounding: essence and detection. Am J Epidemiol. 1981;114:593–603.
Miettinen OS. Stratification by a multivariate confounder score. Am J Epidemiol. 1976;104:609–20.
Rosenbaum PR, Rubin DB. The central role of the propensity score in observational studies for causal effect. Biometrika. 1983;70:41–55.
Mantel N, Haenszel W. Statistical aspects of the analysis of data from retrospective studies of disease. J Nat Cancer Inst. 1959;22:719–48.
Kleinbaum DG, Kupper LL, Morgenstern H. Epidemiologic research. Principles and quantitative methods. New York: Van Nostrand Reinhold, 1982;345.
Freiman JA, Chalmers TC, Smith H, Kuebler RR. The importance of beta, the type II error and sample size in the design and interpretation of the randomized control trial. N Engl J Med. 1978;299:690–4.
Feinstein AR. An additional basic science for clinical medicine: II. The limitations of randomized trials. Ann Intern Med. 1983;99:544–50.
Califf RM, Pryor DB, Greenfield JC. Beyond randomized clinical trials: applying clinical experience in the treatment of patients with coronary artery disease. Circulation. 1986;74:1191–4.
Resnekov L, Fox S, Selzer A, et al. The quest for optimal electrocardiography: task force IV: use of electrocardiograms in practice. Am J Cardiol. 1978;41:170–5.
Goldberger AL, O’Konski M. Utility of the routine electrocardiogram before surgery and on general hospital admission. Ann Intern Med. 1986;105:552–7.
Moorman JR, Hlatky MA, Eddy DM, Wagner GS. The yield of the routine admission electrocardiogram: a study in a general medical service. Ann Intern Med. 1985;103:590–5.
Rabkin SW, Horne JM. Preoperative electrocardiography: its cost-effectiveness in detecting abnormalities when a previous tracing exists. Can Med Assoc J. 1979;121:301–6.
Ferrer MI. The value of obligatory preoperative electrocardiograms: a survey of 1260 patients. J Am Med Wom Assoc. 1978;33:459–64.
Diagnostic and therapeutic technology assessment: mandatory ECG before elective surgery. JAMA. 1983;250:540.
Howland WS, Schmeitzer O, LaDue JS. Evaluation of routine post-operative electrocardiography. N Y State J Med. 1962;62:1941–5.
Tommaso CL, Salzeider K, Arif M, et al. Serial myoglobin vs CPK analysis as an indicator of uncomplicated myocardial infarction size and its use in assessing early infarct extension. Am Heart J. 1980;99:149–54.
Cairns JA, Missirlis E, Walker WH. Usefulness of serial determinations of myoglobin and creatine kinase in serum compared for assessment of acute myocardial infarction. Clin Chem. 1983;29:469–73.
Jaffe AS, Serota H, Grace A, Sobel BE. Diagnostic changes in plasma creatine kinase isoforms early after the onset of acute myocardial infarction. Circulation. 1986;74:105–9.
Horwitz RS, Morganroth J. Immediate detection of early high-risk patients with acute myocardial infarction using two-dimensional echocardiographic evaluation of left ventricular regional wall motion abnormalities. Am Heart J. 1982;103:814–22.
Wackers FJT, Lie KI, Leim KL, et al. Potential value of thallium-201 scintigraphy as a means of selecting patients for the coronary care unit. Br Heart J. 1979;41:111–7.
Lee TH, Goldman L. The coronary care unit turns 25: historical trends and future directions. Ann Intern Med. 1988;108:887–94.
Author information
Authors and Affiliations
Additional information
Received from Brigham and Women’s Hospital, Harvard Medical School, and Harvard School of Public Health, Boston, Massachusetts; Yale-New Haven Hospital and Yale University School of Medicine, New Haven, Connecticut; University of Cincinnati Hospital and University of Cincinnati, Cincinnati, Ohio; Danbury Hospital, Danbury, Connecticut; Milford Hospital, Milford, Connecticut; St. Mary’s Hospital, Waterbury, Connecticut; and William Beaumont Hospital, Royal Oak, Michigan.
Supported in part by grants from the John A. Hartford Foundation, New York, New York (83102-2H) and from the Robert Wood Johnson Foundation, Princeton, New Jersey (12543) Dr. Lee is the recipient of a Public Health Service Clinical Investigator Award (HL01594-05) from the National Heart, Lung, and Blood Institute. Dr. Rouan was a Teaching and Research Scholar of the American College of Physicians and was supported in part by a grant to the Training Program in Clinical Effectiveness from the W. K. Kellogg Foundation.
Rights and permissions
About this article
Cite this article
Lee, T.H., Cook, E.F., Weisberg, M.C. et al. Impact of the availability of a prior electrocardiogram on the triage of the patient with acute chest pain. J Gen Intern Med 5, 381–388 (1990). https://doi.org/10.1007/BF02599421
Issue Date:
DOI: https://doi.org/10.1007/BF02599421