Continuous compression with asynchronous ventilation improves CPR prognosis? A meta-analysis from human and animal...

Area of Science:

• Emergency Medicine
• Cardiology
• Critical Care Medicine

Background:

• The optimal cardiopulmonary resuscitation (CPR) compression-ventilation strategy is debated.
• This meta-analysis compares continuous chest compressions CPR with asynchronous ventilation (CCC-CPR) against interrupted chest compressions CPR with synchronous ventilation (ICC-CPR) in cardiac arrest scenarios.

Approach:

• A systematic literature search was conducted across major databases (PubMed, Web of Science, Embase, MEDLINE, Cochrane Libraries) up to July 31, 2022.
• Included were human and animal studies evaluating CCC-CPR versus ICC-CPR, assessing outcomes like return of spontaneous circulation (ROSC), survival rates, and neurological function.
• Study quality and risk of bias were assessed using the Jadad Scale and Newcastle-Ottawa Scale.

Key Points:

• In human studies (8 trials), no significant differences were found between CCC-CPR and ICC-CPR for ROSC, survival to discharge, 1-month survival, or good neurological outcome.
• Animal studies (12 trials) showed significantly higher ROSC rates and 4-hour survival with CCC-CPR.
• Animal trials also indicated improved mean arterial pressure (MAP) with CCC-CPR, though ROSC time and blood gas parameters showed no significant differences.

Conclusions:

• CCC-CPR did not demonstrate superiority over ICC-CPR in human cardiac arrest outcomes.
• Positive outcomes observed in animal models suggest potential benefits of CCC-CPR that warrant further investigation in human physiology.
• Further research into the physiological mechanisms of different CPR compression-ventilation strategies is crucial for improving cardiac arrest patient prognosis.