Table 4.
Clinical outcomes of patients receiving cardiopulmonary resuscitation (CPR) outside hospital during evaluable period of trial* by initial cardiac rhythm recorded. Values are numbers (percentages) of patients unless stated otherwise
| Initial cardiac rhythm and clinical outcomes | Evaluable period | Difference of feedback-on from feedback-off | |||
|---|---|---|---|---|---|
| Feedback-off | Feedback-on | Cluster adjusted difference in percentage (95% CI) | P value | ||
| Ventricular fibrillation or pulseless ventricular tachycardia: | n=182 | n=191 | |||
| Return of spontaneous circulation (any) | 121 (66) | 129 (68) | 0.7 (−8.0 to 9.5) | 0.861 | |
| Pulse at arrival at emergency department | 96 (53) | 106 (55) | 0.6 (−11.2 to 12.4) | 0.910 | |
| Survival to hospital discharge | 64 (35) | 60 (31) | −5.1 (−15.8 to 5.6) | 0.325 | |
| Pulseless electrical activity: | n=177 | n=210 | |||
| Return of spontaneous circulation (any) | 95 (54) | 101 (48) | −6.8 (−17.1 to 3.4) | 0.170 | |
| Pulse at arrival at emergency department | 67 (38) | 84 (40) | 0.2 (−10.8 to 11.2) | 0.969 | |
| Survival to hospital discharge | 18 (10) | 24 (11) | 1.2 (−5.1 to 7.5) | 0.688 | |
| Asystole: | n=319 | n=336 | |||
| Return of spontaneous circulation (any) | 91 (29) | 91 (27) | 0.7 (−4.2 to 5.7) | 0.769 | |
| Pulse at arrival at emergency department | 59 (18) | 43 (13) | −5.5 (−10.5 to −0.6) | 0.029 | |
| Survival to hospital discharge | 8 (3) | 4 (1) | −1.2 (−2.5 to 0.2) | 0.092 | |
*Trial of CPR provided by emergency medical services with monitor-defibrillator providing real-time feedback on CPR process (“feedback-on”) or not providing feedback (“feedback-off”).