Abstract 25: Effect of Thrombolytics on the Immediate Prognosis for Out-of-Hospital Cardiac Arrest
Immediate care of out-of-hospital cardiac arrest (CA) is standardized by the established ILCOR ACLS Guidelines. Studies concerning the impact of thrombolysis, generally for CA of cardiac etiology have not shown a benefit. We sought to evaluate the rate of hospital admission for all CA patients treated with pre-hospital thrombolytics.
Methods: Non-randomized retrospective study was conducted from 09/1/2005 to 02/15/2007 of non-traumatic CA patients treated with (T+) or without (T-) thrombolysis. The protocol for administration of thrombolytics was at the discretion of the field physician, aiming for within 20 minutes of collapse in almost all cases, and prior to return of spontaneous circulation. The primary endpoint was admission alive to the hospital. We performed multivariate analysis by logistic regression to identify risk factors independently associated with outcome: age, gender, response time, defibrillation, witnessed arrest, bystander CPR.
Results: We reviewed 1331 consecutive patient records, of which 116 (8.7%) received thrombolytics. Both T+ and T- groups had comparable response times, witnessed arrest, and bystander CPR. Patients in T+ were significantly younger (59±14 vs 67±19 years old), predominantly males (81% vs 61%), and received more defibrillation shocks (61% vs 26 %). Significantly more patients T+ arrived alive to hospital for admission (45% vs 24%). Risk factors independently associated with hospital admissions were thrombolysis, age, response time, witnessed arrest, and bystander CPR. The impact of thrombolysis was different whether or not the patient was defibrillated (odds ratio with shocks 1.1 [95%CI: 0.2–5.0] vs without shocks 3.6 [95%CI: 1.9 – 6.9]), despite a greater overall rate of hospital admission for shocked patients.
Conclusion: Thrombolysis appears to improve the rate of admission alive to the hospital in patients that were not defibrillated with adjustment for age, gender, response time, witnessed arrest, and bystander CPR. These preliminary results should be confirmed by a prospective randomized study. This analysis can help determine appropriate inclusion criteria for a future study.