Emergency department (ED) nurses are in a key position to initiate life-saving recommendations for myocardial infarction, which include a physician-read electrocardiogram (ECG) within 10 min of ED arrival. Using a quasi-experimental, one-group pretest-posttest design, the authors evaluated the preliminary effectiveness of the Aid to Cardiac Triage (ACT) intervention to improve ED nurses' cardiac triage decisions. Charts of all women who received an ED ECG 3 months before ( n = 171) and after (n = 184) the intervention and who were at least 18 years of age were reviewed. A 1-hr educational session was conducted to improve nurses' (n = 23) cardiac triage decisions. Postintervention, the proportion of women receiving an ECG within 10 min of ED arrival improved, as did the odds of women receiving a timely ECG. Preliminary evaluation of the ACT intervention indicates its effectiveness at improving ED nurses' cardiac triage decisions and obtaining a 10-min physician-read ECG.