糖原磷酸化酶同工酶脑型在急性心肌梗死早期诊断中的临床意义

目的 探讨糖原磷酸化酶同工酶脑型(GPBB)在急性心肌梗死(AMI)早期诊断中的价值.方法 选择115例发病6 h内的胸痛患者,其中AMI患者45例(AMI组),非AMI患者70例(非AMI组).非AMI组中不稳定型心绞痛(UAP)40例、稳定型心绞痛(SAP)13例、非心源性胸痛17例;选择55例健康体检者作为健康对照组.检测发病0～6 h的血浆GPBB水平,并与心肌肌钙蛋白Ⅰ(cTnI)、肌酸激酶同工酶-MB(CK-MB)和肌红蛋白(MYO)的检测结果进行比较,分析上述指标诊断发病0～3 h和0～6 hAMI的灵敏度、特异度和准确度.结果 在O～3 h和0～6 h时间段,GPBB诊断AMI的灵敏度(64.29%、88.89%)显著高于cTnI(28.57%、60.00%)和CK-MB(21.43%、64.44%),P均<0.05;与MYO(71.43%、77.78%)比较差异无统计学意义.上述指标特异度差异无统计学意义.在0～3 h和0～6h时间段GPBB诊断AMI的准确度(80.77%、89.57%)显著高于cTnI(61.54%、81.74%)、CK-MB(50.00%、75.65%)和MYO(73.08%、73.91%),P均<0.05.结论 GPBB对于诊断早期AMI具有较高的灵敏度和特异度,其诊断准确度优于cTnI、CK-MB和MYO.

Glycogen phosphorylase isoenzyme BB in the diagnosis of acute myocardial infarction in early stage

Objective To evaluate the value of glycogen phosphorylase isoenzyme BB (GPBB) in the diagnosis of early acute myocardial infarction (AMI). Methods The plasma levels of GPBB were mea-sured by sandwich ELISA in 115 patients with suspected AMI at admission within 6 hours after onset of chest pain and 55 normal healthy subjects. The plasma concent of cardiac troponin-Ⅰ (cTnI), creatine kinase-MB (CK-MB) and myoglobin (MYO) was assayed at the same time by using corpuscle chemiluminescence. The patients were classified retrospectively into AMI group (n = 45) , unstable angina pectoris (UAP) group (n =40) , stable angina pectoris (SAP) group (n = 13) and non-cardiac chest pain (NCCP) group (n =17).The diagnostic validity was evaluated in terms of sensitivity and specificity. Results The diagnostic sensitivity of GPBB for AMI was 64.29 % within 3 hours and 88.89 % within 6 hours after onset of chest pain,which is significantly higher than that of cTnI (28.57 %, 60.00 %) and CK-MB (21.43 %, 64.44 % ). There was no significant difference in specificity among the four markers. The diagnostic accuracy of GPBB within 3hours and 6 hours (80.77 %, 89.57% ) was significantly higher than that of cTnI (61.54%, 81.74% ),CK-MB (50.00%, 75.65%) and MYO (73.08% ,73.91%). Conclusions GPBB seems to be a sensitive and specific biochemical cardiac marker for AMI in the early stage. Its diagnostic accuracy is higher than that of cTnI, CK-MB, MYO.