Effects of oxygen therapy on the outcome of patients with acute myocardial infarction: A randomized clinical trial

Abstract

Objective: To investigate the therapeutic effects of supplemental oxygen on patients with myocardial infarction. Methods: This study was a randomized, double-blind clinical trial. The study population included all patients who were admitted to the emergency room of Ali-ibn-Abitaleb and Khatam-al-Anbia hospitals in Zahedan within six hours of the onset of classic symptoms of myocardial infarction. The patients (n=47) were divided into two groups: the case group (with oxygen therapy) and the control group (without oxygen therapy). The initial follow-up was evaluated after one month and the second follow-up was evaluated after three months in the target population in terms of mortality caused by acute myocardial infarction, mortality caused by any other cause, and re-hospitalization caused by acute myocardial infarction. Results: Out of the 47 patients, 27 were male (57.4%). The average age of the patients was (60.9±8.1) years. One month after admission, 2 patients (8.7%) in the case group and 2 patients (8.3%) in the control group died due to acute myocardial infarction. A total of 7 patients (14.9%) died three months after admission. There was no significant difference between the control and case groups in terms of mortality caused by acute ischemia within one and three months. After one month, 2 patients (8.7%) in the case group and 1 patient (4.2%) in the control group died of other causes. After three months, 4 patients (8.5%) in total died for other causes. There was no significant difference between the control and case groups in terms of mortality due to other causes within one and three months. One month after admission, 5 patients (21.7%) of the case group and 4 patients (16.7%) of the control group were re-hospitalized due to acute myocardial ischemia. During the next three months, 3 patients (13.0%) of the case group and 5 patients (20.8%) of the control group were re-hospitalized. There was no significant difference between the control and case groups regarding the rate of re-hospitalization caused by acute myocardial infarction within one and three months after admission. Conclusions: There is no significant relationship between oxygen therapy and death by acute myocardial ischemia, or any other causes. The relationship between oxygen therapy and the rate of re-hospitalization caused by acute myocardial ischemia is not found within one and three months after admission. The results show that oxygen therapy does not affect patients with acute myocardial ischemia within three months after admission.

Keywords

• oxygen therapy; myocardial infarction; mortality; cardiac ischemia; hospitalization