Table 4.
Comparison of adjusted odds ratios of subsequent shock delivery for improving outcomes in previous studies a
| Study | Year of publication | n | Endpoint | Proportion of patients with conversion to shockable rhythm | Shock delivery time b , mean (SD), min | Adjusted OR | 95% CI |
|---|---|---|---|---|---|---|---|
| Hallstrom et al. [10] | 2007 | 738 | Survival to hospital discharge | 22.2% | 21.0 (8.1)c | 0.18 | Unknown (P =0.036) |
| Herlitz et al. [11] | 2008 | 22,465 | 1-month survival | 26% | Unknown | 1.96 | 1.49 to 2.56 |
| Kajino et al. [12] | 2008 | 12,353 | 1-month CPC 1 or 2 | 4.8% | 12.3 (6.9) | 4.3 | 2.8 to 6.7 |
| Olasveengan et al. [13] | 2009 | 751 | Survival to hospital discharge | 13.0% | Unknown | 3.02 | 1.07 to 8.57 |
| Thomas et al. [14] | 2013 | 6,556 | Survival to hospital discharge | 18.9% | Unknown | 0.89 | 0.55 to 1.45 |
aCI, Confidence interval; CPC, Cerebral Performance Categories scale; OR, Odds ratio; SD, Standard deviation. bTime from the initiation of cardiopulmonary resuscitation by emergency medical services personnel to the first defibrillation. cNumbers were calculated using data from the original papers.