| Objective: To analyze the relationship between Tp-Te interval,Tp-Te/QT ratio and perioperative ventricular tachycardia of Percutaneous Coronary Intervention(PCI)for acute myocardial infarction(AMI),and to discuss the clinical significance and provide the intervention strategy.Methods: Based on the strict inclusion and exclusion criteria,126 patients diagnosed as AMI in The XXX Hospital of PLA from September 2014 to September 2016 were selected.Allthe patients were given the 12 leads electrocardiogram check.The patients were divided into two groups according to the occurrence of paroxysmal ventricular tachycardia after myocardial infarction.59 of AMI patients,who were underwent direct percutaneous coronary intervention(PCI),were diagnosed as nonsustained ventricular tachycardia and were defined as VT group,while the other 67 AMI patients without nonsustained ventricular tachycardia were diagnosed as N-VT groups.60 cases of healthy people received in The XXX Hospital of PLA were selected as the control group at the same period.QT interval,Tp-Te interval,T waves summit as well as terminal point of electrocardiogram for all the patients were measured separately,meanwhile,TpTecandQTc were calculated based on correction formula.Tp-Tec and Tp-Te/QT ratio of the three groups were comparatively analyzed separately.Using SPSS 17.0 software,combined the nonsustained ventricular tachycardiaattacks of electrocardiogram,compare and analyze the relationship between the change of the two indexes and paroxysmal ventricular tachycardia based on the sensitivity,specificity,positive predictive value and negative predictive value of Tp-Tec as well as Tp-Te/QT ratio prediction of ROC curve for AMI complicating ventricular tachycardia patients.The predictive value of clinical effects for Tp-Tec as well as Tp-Te/QT ratio was evaluated by the different treatment schedules of AMI and combined ventricular tachycardiapatients.Results:TheTp-Tec,QTc as well as Tp-Te/QT of VT group before PCI were(121.65±11.35)ms,(456.48±12.57)ms,(0.27±0.022)ms,respectively.However,The TpTec,QTc as well as Tp-Te/QT of VT group after PCI were(94.53±10.09)ms,(402.96±10.32)ms,(0.23±0.02)ms,respectively.The Tp-Tec,QTc as well as Tp-Te/QT of B group admitted to hospital were(109.6±10.65)ms,(454.28±11.37)ms,(0.24±0.02)ms,while The Tp-Tec,QTc as well as Tp-Te/QT of CG group were(90.98±11..15)ms,(399.29±10.64)ms,(0.22±0.02)ms,respectively.The Tp-Tec,QTc as well as Tp-Te/QT ratio of VT group before PCI rose obviously and showed remarkable difference compared with CG group(P<0.01).Similarly,the Tp-Tec,QTc as well as Tp-Te/QT ratio of B group elevated obviously and showed significant difference compared with CG group(P<0.01).The Tp-Tec and Tp-Te/QT ratio of VT group before PCI showed significant difference compared with B group(P<0.01),while the QTc between VT group before PCI and B group were without significant difference.Compared with VT group before PCI,the TpTec,QTc as well as Tp-Te/QT ratio after PCI reduced obviously and showed remarkable difference(P<0.01).After PCI,the Tp-Tec,QTc as well as Tp-Te/QT ratio between VT and CG group were without difference(P>0.05).Compared with QTc,the Tp-Tec and TpTe/QT ratio showed remarkable significance through ROC curve.The sensitivity,specificity,positive predictive value as well as negative predictive value of Tp-Tec were 88.1%,92.4%,92.6% and 87.7%,respectively.However,the sensitivity,specificity,positive predictive value as well as negative predictive value of Tp-Te/ QT were 84.7%,64.7%,49.4% and 91.2%,respectively.The clinical effects could be evaluated by Tp-Tec,Tp-Te/QT as well as QTc.Among the three indexes,the predictive value of Tp-Tec and Tp-Te/QT ratio was more distinct than QTc.Conclusion: 1.The Tp-Tec is an independent risk factor for ventricular tachycardia patients with AMI.2.Tp-Tec,QTc and Tp-Te /QT were prolonged in patients with AMI.Tp-Tecand Tp-Te /QT in patients with ventricular tachycardia were greater than those without ventricular tachycardia in AMI.3.The sensitivity,specificity,positive predictive value and negative predictive value of Tp-Tec in ventricular tachycardia patients with AMI were 88.1%,92.4%,83.8% and 87.7%,respectively.4.The sensitivity,specificity,positive predictive value and negative predictive value of Tp-Te/ QT in ventricular tachycardia patients with AMI were 84.7%,64.7%,49.4% and 91.2%,respectively. |
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