经9年的随访观察，美托洛尔可进一步减少老年无症状性心肌缺血发作的总次数和总时间，并改善患者的预后。
After 9 years of follow_up, metoprolol could reduce the total times and duration and improve the prognosis in senile patients with AMI.
经9年的随访观察，美托洛尔可进一步减少老年无症状性心肌缺血发作的总次数和总时间，并改善患者的预后。
After 9 years of follow_up, metoprolol could reduce the total times and duration and improve the prognosis in senile patients with AMI.
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