Table 3.
Odds Ratios for Initial Ventricular Fibrillation or Pulseless Ventricular Tachycardia (or Shockable Rhythm) in Cardiac Arrests Occurring in Public versus Arrests at Home, According to Circumstances of the Event.*
| Variable | Bystander Witnessed Arrest | EMS Witnessed Arrest | Bystander Applied AED | ||||||
|---|---|---|---|---|---|---|---|---|---|
| VF or VT | Unadjusted Odds Ratio (95% CI) |
Adjusted Odds Ratio (95% CI) |
VF or VT | Unadjusted Odds Ratio (95% CI) |
Adjusted Odds Ratio (95% CI) |
VF or VT | Unadjusted Odds Ratio (95% CI) |
Adjusted Odds Ratio (95% CI) |
|
| no./total no. of arrests (%) |
no./total no. of arrests (%) |
no./total no. of arrests (%) |
|||||||
| Location of arrest | |||||||||
| Home | 1193/3451 (35) | 207/835 (25) | 25/69 (36) | ||||||
| Public | 600/1003 (60) | 2.82 (2.44–3.26) | 2.28 (1.96–2.66)† | 61/161 (38) | 1.85 (1.30–2.64) | 1.63 (1.13–2.35)‡ | 125/159 (79) | 6.47 (3.48–12.03) | 4.48 (2.23–8.97)† |
| Male sex | 2.15 (1.87–2.46) | 1.88 (1.63–2.17)† | 1.95 (1.44–2.64) | 1.83 (1.34–2.48)† | 3.07 (1.59–5.94) | 2.08 (0.94–4.58) | |||
| Age (per 5-yr increase) | 0.92 (0.90–0.93) | 0.94 (0.92–0.96)† | 0.93 (0.90–0.98) | 0.99 (0.98–1.00) | 1.00 (0.91–1.10) | 1.02 (0.91–1.13) | |||
| Bystander witnessed arrest | 4.67 (2.56–8.49) | 3.50 (1.76–6.97)† | |||||||
| Bystander performed CPR | 1.98 (1.75–2.24) | 1.76 (1.55–2.01)† | 1.96 (1.79–2.15) | 2.09 (0.64–6.84) | |||||
| Time from 911 call to EMS arrival |
1.00 (1.00–1.00) | 1.00 (1.00–1.00) | 1.00 (0.99–1.02) | 1.00 (0.98–1.03) | |||||
*
AED denotes automated external defibrillator, CPR cardiopulmonary resuscitation, EMS emergency medical services, VF ventricular fibrillation, and VT pulseless ventricular tachycardia.
†
P<0.001.
‡
P = 0.009