How long should you perform CPR before evaluating for a change in rhythm or pulse?

The recommended duration of CPR before evaluating for a change in rhythm or pulse is a minimum of 2 minutes. During cardiac arrest, continuous high-quality chest compressions are crucial to maintaining blood flow and increasing the chances of survival. Performing CPR for at least 2 minutes ensures that there is sufficient time for the heart to potentially return to a viable rhythm, as immediate reassessment too soon may not accurately reflect the effectiveness of the resuscitation efforts.

This duration allows the responder to focus on delivering effective compressions, without interruptions, which is vital for enhancing coronary and cerebral perfusion during cardiac arrest. After 2 minutes of CPR, it is appropriate to pause briefly to check for any signs of a return of spontaneous circulation, such as the presence of a pulse or any signs of life, as recommended in Advanced Life Support protocols.