Circadian variation of myocardial ischemia in patients with unstable angina pectoris secondary to fixed and/or spastic coronary narrowing.
We investigated the circadian variation of myocardial ischemia in patients with unstable angina using a 24-hour 12-lead electrocardiographic monitoring system with computer analysis. The circadian variation of ischemic attacks in patients who had ST elevation showed a similarity to that of the onset of acute myocardial infarction and most of these patients had vasospasm without organic stenosis; no similarity was seen in patients with organic stenosis.
Onaka
H
H
Department of Internal Medicine, Osaka Medical College, Takatsuki, Japan.
Hirota
Y
Y
Shimada
S
S
Mishima
T
T
Shimoyama
H
H
Sakai
Y
Y
Kawamura
K
K
D000368:Aged; D000789:Angina, Unstable / Q000150:complications / Q000209:etiology / Q000503:physiopathology*; D002940:Circadian Rhythm; D003329:Coronary Vasospasm / Q000150:complications / Q000503:physiopathology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000503:physiopathology