女,65岁,冠心病心绞痛史8年,无高血压史,夜间突发心前区疼痛8小时入院。入院时血压为150/90mmHg(20/12kPa),经心电图检查,诊断急性前壁心肌梗死此时最具特征性的实验室改变是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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