Response Time Threshold for Predicting Outcomes of Patients with Out-of-Hospital Cardiac Arrest

Table 1

Demographic characteristics, comorbidities, and prehospital factors of 6742 medical out-of-hospital cardiac arrest patients.

Characteristics of medical out-of-hospital cardiac arrest (OHCA) patients	Survived to hospital discharge n = 224 (3.3%)	Did not survive to hospital discharge n = 6518 (96.7%)
Age (years)	60.9 ± 14.4	68.3 ± 16.1	<0.001
Male sex	162 (72.3%)	4190 (64.3%)	0.014
EMS response time (min)	5.8 ± 2.2	7.0 ± 3.2	<0.001
Witnessed arrests	192 (85.7%)	3872 (59.4%)	<0.001
Cardiac arrest location (public)	101 (45.1%)	1064 (16.3%)	<0.001
Bystander CPR	117 (52.2%)	2536 (38.9%)	<0.001
Bystander keep airway	27 (12.1%)	418 (6.4%)	0.001
Attended by EMS-paramedic	88 (39.3%)	1730 (26.5%)	<0.001
Initial shockable rhythm	34 (15.2%)	191 (2.9%)	<0.001
Defibrillation by AED	113 (50.4%)	875 (13.4%)	<0.001
Hypertension	89 (39.7%)	2284 (35.0%)	0.254
Diabetes	59 (26.3%)	1637 (25.1%)	0.807
Old stroke	19 (8.5%)	478 (7.3%)	0.617
Malignancy	15 (6.7%)	522 (8.0%)	0.41
Liver disease	10 (4.5%)	207 (3.2%)	0.326
Respiratory disease	12 (5.4%)	265 (4.1%)	0.401
Renal disease	25 (11.2%)	579 (8.9%)	0.3