结论：梗塞前心绞痛发作对心肌产生的缺血预适应有明确的心肌保护作用。
Conclusion: the angina attack before infarction can produce the ischemic preconditioning on myocardium that provides myocardium with definite protection.
目的：评价急性心肌梗塞(ami)前心绞痛发作对ami预后的影响。
Objective: to evaluate the effect of angina pectoris attack before infarction on the prognosis of acute myocardial infarction (AMI).
心绞痛性疼痛，通常不如急性心肌梗塞时心前区挤压感觉那样剧烈。
The pain of angina is usually not as severe as the intense precordial crushing sensation associated with acute myocardial infraction.
心绞痛性疼痛，通常不如急性心肌梗塞时心前区挤压感觉那样剧烈。
The pain of angina is usually not as severe as the intense precordial crushing sensation associated with acute myocardial infraction.
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