[Prognostic implications of early discharge from the coronary unit in patients with acute myocardial infarction].

INTRODUCTION AND OBJECTIVES

The high demand for health care has obliged Coronary Units to hasten the discharge of patients in less serious condition and this might be an influence on their prognosis. Our objective have been: a) to analyse the characteristics and the evolution (death or readmission) during the first month of patients with myocardial infarction and very early discharge from the Coronary Unit (stay of 2 days or less), and b) to assess the profile of very low risk group patients for complications who could be discharged early from the Coronary Unit.

PATIENTS AND METHODS

A study of 978 consecutive patients who had been admitted for acute myocardial, in faration were divided into two groups according to their length of stay in the Coronary Unit (A < or = 2 and B > 2 days). Their baseline characteristics, course of stay and vital status at month, were compared. A subgroup of patients at low risk was studied and complications that might have arisen from their early discharge from the Coronary Unit were assessed.

RESULTS

Seventy-three patients (7.5%) died within the first two days. Of the remaining 905, the stay was 2 days or less for 336 patients (group A); and longer than 2 days for 569 (group B). Group A had a higher frequency of dyslipemia, Killip class I on admission, uncomplicated myocardial infarction in the Coronary Unit and the use of beta-blockers and had less frequency of diabetes, Q wave myocardial infarction, anterior infarction or the use of fibrinolytics. In the first month after discharge from the Coronary Unit, 10 patients from group A and 18 patients from group B died, the rate of death or readmission into the Coronary Unit within 30 days was similar between both groups (group A = 13% and group B = 13%). A multiple regression showed that Killip class on admission (p < 0.001) and an uncomplicated course (p < 0.001) were independently related with the length of stay in the coronary unit. A subset of 378 low risk patients (Killip I on admission, uncomplicated course in the ICU and age < 71 years) had no mortality at 30 days and their readmission rate in the first month was 4%. In this subgroup, those patients whose stay was equal to or less than two days were more frequently readmitted in the first week. (group A = 9/197 [5%] and group B = 1/181 ([0.5%]; p = 0.034).

CONCLUSION

Selected patients with myocardial infarction can be discharged very early from the Coronary Unit with a low risk of death. A readmission rate following discharge of some 5% must be allowed for these patients.