However, some researchers question the validity of the ASPIRE protocol. The CIRC study results additionally indicate that the AutoPulse increases the time before first defibrillation and decrease the average compressions per minute in comparison with manual CPR.
Despite some researchers' doubts about the effectiveness of the ASPIRE protocol, a separate study by CIRC found that using the AutoPulse device results in a longer wait time before administering defibrillation and fewer chest compressions per minute compared to traditional manual CPR.