The Association between Door-to-Balloon Time of Less Than 60 Minutes and Prognosis of Patients Developing ST Segment Elevation Myocardial Infarction and Undergoing Primary Percutaneous Coronary Intervention

Table 2

Event and procedural characteristics.

Variables	Door-to-balloon < 60 min; ()	Door-to-balloon 60~90 min; ()	value
Door-to-ECG time	3.8 ± 4.95	9.8 ± 9.81	<0.001
Door-to-balloon time	48.4 ± 7.99	72.2 ± 14.09	<0.001
Dual antiplatelet therapy			0.802
Clopidogrel and aspirin	180 (74.7%)	79 (76.0%)
Ticagrelor and aspirin	61 (25.3%)	25 (24.0%)
Killip III-IV	50 (20.7%)	33 (31.7%)	0.029
Pulseless VT/Vf	20 (8.3%)	14 (13.5%)	0.140
AV conduction block	17 (7.1%)	12 (11.5%)	0.168
Cardiopulmonary resuscitation	11 (4.6%)	13 (12.5%)	0.008
Endotracheal intubation	16 (6.6%)	20 (19.2%)	<0.001
Intra-aortic balloon pumping	33 (13.7%)	24 (23.1%)	0.031
Extracorporeal membrane oxygenation	6 (2.5%)	5 (4.8%)	0.261
Occlusion vessel number			0.735
One	120 (49.8%)	47 (45.2%)
Two	55 (22.8%)	26 (25.0%)
Three	66 (27.4%)	31 (29.8%)

Pulseless VT/Vf: pulseless ventricular tachycardia/ventricular fibrillation.
AV conduction block: atrioventricular conduction block.