Table 1 Characteristics of the seven studies included in meta-analysis.
First | Location | Patients | ER(+) | Study | ER definition | The variables of | Endpoints | Follow-up | Quality |
|---|---|---|---|---|---|---|---|---|---|
author | (n) | n(%) | design | multivariate model | score | ||||
(Year) | |||||||||
Identification of ER before AMI | |||||||||
Naruse et al.7 (2012) | Japan | 220 | 34 (16) | Cohort | An elevation of the QRS-ST junction of >0.1 mV from baseline in at least 2 inferior or lateral leads, manifested as QRS slurring or notching | Age per year, male sex, time from the symptom onset to emergency room of <180 minutes, Killip class >1, peak CK levels >3000 U/L, No. of diseased coronary arteries >1, STEMI, hypertension, diabetes mellitus, smoking | Sustained VF | 48 hours | 9 |
Kim et al.12(2014) | Korea | 296 | 52 (17.6) | Cohort | J point elevations manifested through QRS notching or slurring for at least 1 mm (0.1 mV) above the baseline in at least two consecutive inferior or lateral leads | Unadjusted | VF | 48 hours | 9 |
Patel et al.8(2012) | America | 100 | 30 (30) | Case-control | Notching, slurring, or J-point elevation ≥0.1 mV above baseline in ≥2 contiguous inferior, lateral, or anterior leads | LVEF | VTAs(Non-sustained VT, Sustained VT, VF) | 72 hours | 9 |
Diab et al.13(2014) | Egypt | 102 | 43 (42.2) | Case-control | ≥1 mm J point elevation with or without ST segment elevation. | LVEF, QTc and QTd | VTAs(Sustained VT, VF) | 48 hours | 8 |
Identification of ER after AMI | |||||||||
Özcan et al.10 (2014) | Turkey | 521 | 61 (11.7) | Cohort | Elevation of the J-point (QRS–ST Junction) above 0.1 mV relative to QRS onset in two or more inferior leads (DII–DIII-aVF), limb lateral leads (DI-aVL), or left precordial leads (V4–V6) | Unadjusted | VTAs(Sustained VT, VF) | 30 days | 8 |
Park et al.11 (2014) | Korea | 266 | 76 (28.6) | Cohort | J-point elevation ≥0.1 mV and “notching” and “slurring” of the terminal part of the QRS complex in at least 2 lateral or inferior leads. | Inferior MI, E/E′, LVEF (<45%) | VTAs(Non-sustained VT, Sustained VT, VF) | 6.7 ± 4.5 days | 8 |
Rudic et al.9 (2012) | Germany | 60 | 18 (30) | Case-control | J-point elevation ≥0.1 mV and “notching” and “slurring” of the terminal part of the QRS complex in at least 2 lateral or inferior leads. | LVEF and QTc | VF | During hospitalization | 7 |
