Related Experiment Videos
The ACLS score. Predicting survival from out-of-hospital cardiac arrest
Insights
A new score predicts survival after out-of-hospital cardiac arrest. It uses witnessed arrest, cardiac rhythm, bystander CPR, and response time to estimate resuscitation success for emergency personnel.
Area of Science:
- Emergency Medicine
- Cardiology
- Public Health
Background:
- Out-of-hospital cardiac arrest (OHCA) has a low survival rate.
- Predictive tools are needed to guide resuscitation efforts and resource allocation.
Purpose of the Study:
- To develop and validate a simple, objective score to predict survival after OHCA.
- To provide emergency medical services (EMS) personnel with a tool for realistic prognostication at the scene.
Main Methods:
- Retrospective analysis of 611 OHCA cases.
- Development of a predictive score based on four key variables: witnessed arrest, cardiac rhythm, lay bystander cardiopulmonary resuscitation (CPR), and paramedic response time (speed).
Main Results:
- The developed score, termed the ACLS score, incorporates four readily available factors.
- Patients with all four favorable variables (witnessed arrest, ventricular fibrillation, bystander CPR, response time < 4 min) had a 70% survival rate.
- Patients with none of the favorable variables had a 1% survival rate.
Conclusions:
- The ACLS score provides a realistic appraisal of resuscitation likelihood for OHCA patients.
- This score can aid emergency personnel in decision-making and patient management at the scene.
- Further validation in prospective studies is warranted.
Abstract:
We developed a score predictive of survival following out-of-hospital cardiac arrest from an analysis of factors associated with 611 cases. The score is calculated from four pieces of information readily obtainable by emergency personnel directly at the scene. The four items are as follow: A, arrest witnessed; C, cardiac rhythm; L, lay bystander cardiopulmonary resuscitation (CPR); S, speed (response time of paramedic unit). Among 22 patients with favorable findings on all four predictive variables (witnessed arrest, ventricular fibrillation, bystander CPR, paramedic response time less than four minutes), 15 (70%) were discharged alive. The ACLS score for this group of patients was 70%. Among 97 patients with the most unfavorable findings (whose ACLS score was 0), one (1%) was discharged. We believe the score can provide emergency personnel with a realistic appraisal of the likelihood of successful resuscitation.