对80例因怀疑AMI收入CCU(冠心病监护室)的患者定期测定血清CK、乳酸脱氢酶(LDH)及LDH同功酶以研究LDH同功酶对诊断AMI的意义。认为LDH_1>LDH_2对诊断的意义稍小于CK升高。但LDH_1绝对值之峰值与CK峰值有较好的相关性(r=0.92)。由于LDH_1>LDH_2较CK升高历时久得多,故适用于检出就诊较晚的患者。若LDH_1>LDH_2持续超过2周,则心衰发生率及病死率均显著增高(P<0.01)。对估计预后有价值。 Serum CK, lactate dehydrogenase (LDH) and LDH isoenzyme were measured regularly in 80 patients with suspected AMI income from CCU (Coronary Care Unit) to study the significance of LDH isozyme in the diagnosis of AMI. The significance of LDH_1> LDH_2 in diagnosis is slightly less than CK. However, the absolute peak value of LDH_1 had a good correlation with the CK peak value (r = 0.92). Because LDH_1> LDH_2 is much longer than CK rise, it is suitable for patients who have been diagnosed later. If LDH_1> LDH_2 persisted for more than 2 weeks, the incidence of heart failure and mortality were significantly increased (P <0.01). The estimated prognosis is valuable.