Long-term beneficial effect of infarct-related artery patency in acute anterior myocardial infarction in patients with poor myocardial viability in the region-at-risk.
BACKGROUND
Several studies have demonstrated the benefit of the patency of infarct-related artery (IRA) in acute myocardial infarction (AMI). However those studies have not been concerned with myocardial viability in the region-at-risk. In the present study the effect of the patency of IRA was investigated in the setting of anterior AMI with poor viable myocardium in the risk region.


RESULTS
From 1993 to 1996 patients with a first time anterior AMI and poor viable myocardium in the region-at-risk at 1 month after onset were identified and enrolled. Patients with a totally occluded IRA were included in the Non-Open group (n=44), and patients with a reperfused IRA were included in the Open group (n=49). At 5 years after onset, left ventricular function was better preserved in the Open group than in the Non-Open group (p<0.05). Kaplan-Meier survival curves for cardiac mortality and event-free survival curves revealed poor prognoses in the Non-Open group over a 5-year period (p<0.05, respectively). The advantages of a patent IRA were further seen in health-related quality-of-life outcomes (p<0.05).


CONCLUSIONS
Even in patients with poor myocardial viability after an anterior AMI, the patency of the IRA is strongly associated with improved long-term survival, independent of residual myocardium viability.
Fukuda
Daiju
D
Department of Internal Medicine and Cardiology, Graduate School of Medicine, Osaka City University Medical School.
Yoshiyama
Minoru
M
Shimada
Kenei
K
Kawarabayashi
Takahiko
T
Tanaka
Atsushi
A
Ehara
Shoichi
S
Nakamura
Yasuhiro
Y
Akioka
Kaname
K
Takeuchi
Kazuhide
K
Yoshikawa
Junichi
J
D000368:Aged; D001158:Arteries / Q000503:physiopathology; D003331:Coronary Vessels / Q000503:physiopathology*; D005260:Female; D005500:Follow-Up Studies; D006321:Heart / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000401:mortality / Q000503:physiopathology* / Q000628:therapy*; D011788:Quality of Life; D012189:Retrospective Studies; D012307:Risk Factors; D016019:Survival Analysis; D014022:Tissue Survival; D014654:Vascular Patency