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Aims: In patients with ST-elevation myocardial infarction(STEMI) scheduled for primary percutaneous coronary intervention(primary PCI), acute risk-assessment may be valuable for tailoring of adjunctive therapy at the time of coronary intervention. The present study was designed to quantify pre-, per-, and post-interventional ST-changes, to evaluate whether a pre-specified continuous ST-monitoring classification provides potential prognostic information in the pre- and per-interventional phase, and to compare post-interventional ST-resolution parameters derived from continuous ST-monitoring and snapshot ECGs, respectively. Methods and results: In 92 STEMI patients, continuous ST-monitoring was initiated in the prehospital phase and continued during and 90 min following PCI. Patients were divided into three groups:(A) patients achieving spontaneous ST-resolution before PCI;(B) patients with preserved ST-elevation immediately before PCI and with no increase in ST-elevation during PCI; and(C) patients with preserved ST-elevation immediately before PCI and with increase in ST-elevation during PCI. Groups A(n=22), B(n=43), and C(n=27) differed in peak level of troponin-T(1.4, 4.7, and 7.2 μ g/L, P < 0.001), creatinine kinase MB isoenzyme(35, 150, and 325 μ g/L, P < 0.001), and N-terminal pro-brain natriuretic peptide(Nt-pro-BNP)(183, 175, and 269 pmol/L, P=0.084) during admission, and left ventricular ejection fraction evaluated within 2 h of PCI(0.53, 0.48, and 0.45, P=0.047) and after 3 months(0.58, 0.54, and 0.45, P < 0.001). Groups B and C also differed in time from first balloon inflation to ≥ 70% resolution of ST-elevation(14 vs. 42 min, P=0.002), whereas no differences were observed in traditional 90 min ST-resolution analysis or angiographically assessed parameters. Conclusion: STEMI patients transferred for primary PCI are heterogeneous with respect to pre- and per-interventional ST-changes, and a pre-specified ST-monitoring classification seems useful for stratification of patients at time of PCI into groups with low, intermediate, and high risk profile. Furthermore, post-interventional ST-monitoring indicates that traditional 90 min ST-resolution analysis may have limited value in the era of primary PCI.
Aims: In patients with ST-elevation myocardial infarction (STEMI) scheduled for primary percutaneous coronary intervention (primary PCI), acute risk-assessment may be valuable for tailoring of adjunctive therapy at the time of coronary intervention. The present study was designed to quantify pre-, per-, and post-interventional ST-changes, to evaluate whether a pre-specified continuous ST-monitoring classification provides potential prognostic information in the pre- and per-interventional phases, and to compare post-interventional ST-resolution parameters derived from continuous ST-monitoring and snapshot ECGs, respectively. Methods and results: In 92 STEMI patients, continuous ST-monitoring was initiated in the prehospital phase and continued during and 90 min following PCI. Patients were divided into three groups: (A) Patients achieved spontaneous ST-resolution before PCI; (B) patients with preserved ST-elevation immediately before PCI and with no increase in ST-elevation during PCI; and Groups A (n = 22), B (n = 43), and C (n = 27) differed in peak level of troponin (C) patients with preserved ST-elevation immediately before PCI and with increase in ST- elevation during PCI Creatinine kinase MB isoenzyme (35, 150, and 325 μg / L, P <0.001), and N-terminal pro-brain natriuretic peptide (183, 175, and 269 pmol / L, P = 0.084) during admission and left ventricular ejection fraction plays within 2 h of PCI (0.53, 0.48 and 0.45, P = 0.047) and after 3 Groups B and C also differed in time from first balloon inflation to ≧ 70% resolution of ST-elevation (14 vs. 42 min, P = 0.002), with no difference (0.58, 0.54, and 0.45, were observed in the traditional 90 min ST-resolution analysis or angiographically assessed parameters. Conclusion: STEMI patients transferred for primary PCI are heterogeneous with respect to pre- and per-interventional ST-changes, and a pre-specified ST-monitoring classification seems useful for st ratiFurther, post-interventional ST-monitoring indicates that traditional 90 min ST-resolution analysis may have limited value in the era of primary PCI.