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.
Some experts question the reliability of the ASPIRE protocol, while a separate investigation by CIRC found that using the AutoPulse device leads to a longer delay before administering defibrillation and fewer chest compressions per minute compared to traditional cardiopulmonary resuscitation techniques.