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Table 3 Univariate analysis of patients’ demographics and ECG findings compared with status of coronary arteries

From: A model for predicting angiographically normal coronary arteries in survivors of out-of-hospital cardiac arrest

   Unit Abnormal coronary (n = 22) Normal coronary (n = 25) p value
  Age Mean ± SD 65 ± 9 47 ± 16 <0.001
  Gender (Male) n (%) 22 (100) 20 (80) 0.0518
Past history HT n (%) 9 (41) 8 (32) 0.5583
HL n (%) 4 (18) 3 (12) 0.6902
DM n (%) 6 (27) 0 (0) 0.0069
ACS n (%) 6 (27) 0 (0) 0.0069
PCI n (%) 5 (23) 0 (0) 0.0172
CABG n (%) 3 (14) 0 (0) 0.0950
Heart failure n (%) 2 (9) 4 (16) 0.6701
Arrhythmia n (%) 3 (14) 10 (40) 0.0561
Prehospital status Chest pain before arrest n (%) 2 (9) 2 (8) 1.0000
VT/VF on EMT arrival n (%) 21 23 1.0000
ECG findings HR Mean ± SD 96 ± 29 84 ± 23 0.1393
Axis deviation (RAD or LAD) n (%) 0 (0) 3 (12) 0.8368
AF or AFL n (%) 7 (32) 6 (24) 0.7450
Junctional rhythm n (%) 1 (5) 3 (12) 0.6115
P wave n (%) 14 (64) 21 (84) 0.1800
Abnormal P wave n (%) 7 (32) 4 (16) 0.3027
Abnormal PQ interval n (%) 9 (410) 9 (36) 0.7712
Prolonged PQ n (%) 1 (5) 5 (20) 0.1936
Any abnormal QRS n (%) 16 (73) 19 (76) 1.0000
Wide QRS n (%) 1 (5) 3 (12) 0.6115
QRS width (ms) Mean ± SD 98 ± 32 91 ± 25 0.4028
RBBB n (%) 6 (27) 6 (24) 1.0000
LBBB (LAH or LPH) n (%) 1 (5) 4 (16) 0.3525
Any BBB n (%) 7 (32) 8 (32) 1.0000
Bifascicular block n (%) 1 (5) 2 (8) 1.0000
Q wave n (%) 12 (55) 9 (36) 0.2481
Any abnormal ST segment change n (%) 22 (100) 17 (68) 0.0045
ST segment elevation n (%) 14 (64) 7 (28) 0.0200
ST segment depression without reciprocal change n (%) 7 (32) 10 (40) 0.7617
Any ST segment depression n (%) 16 (73) 13 (52) 0.2293
Prolonged QT interval n (%) 12 (55) 14 (56) 1.0000
Invert (coronary or negative or flat) n (%) 5 (23) 1 (4) 0.0848
Abnormal U wave n (%) 4 (18) 4 (16) 1.0000
Expert opinionsa Cardiologist # 1 assessment of ECG n (%) 16 (73) 20 (80) 0.0004
Cardiologist # 2 assessment of ECG n (%) 16 (59) 21 (84) 0.0029
  1. ECG electrocardiogram, HT hypertension, HL hyperlipidemia, DM diabetes mellitus, ACS acute coronary syndrome, PCI percutaneous coronary intervention, CABG coronary artery bypass graft, CPR cardiopulmonary resuscitation, VT/VF ventricular tachycardia/ventricular fibrillation, EMT emergency medical technician, HR heart rate, RAD or LAD right axis deviation or left axis deviation, AF or AFL atrial fibrillation or atrial flutter, RBBB right bundle branch block, LBBB left bundle branch block, LAH left anterior hemiblock, LPH left posterior hemiblock, BBB bundle branch block
  2. a K = 0.5616