A client is curious about the compression-to-ventilation ratio during CPR. What is the nurse's best response?

A) Correct. The absence of a pulse is the most reliable indicator of cardiac arrest. In cardiac arrest, the heart is no longer pumping effectively, leading to the absence of a palpable pulse.

B) Incorrect. An irregular breathing pattern may be observed in various medical conditions, including respiratory distress, but it is not as definitive as the absence of a pulse in indicating cardiac arrest.

C) Incorrect. Cyanosis of the lips and fingertips can occur in various situations, such as respiratory failure or decreased oxygenation, but it is not specific to cardiac arrest.

D) Incorrect. Sudden loss of consciousness can occur due to various reasons, including seizures or fainting, and is not solely indicative of cardiac arrest.

A) Incorrect. While prompt action is important, performing CPR on someone who does not require it can be harmful. CPR should only be initiated in confirmed cases of cardiac arrest.

B) Correct. Performing CPR on someone who is not in cardiac arrest can cause harm and is not indicated. It is crucial to ensure the person is unresponsive and not breathing before initiating CPR.

C) Incorrect. Bystanders can play a vital role in initiating CPR in cardiac arrest situations. CPR training is not limited to healthcare professionals.

D) Incorrect. In cardiac arrest situations, time is of the essence. Waiting for emergency medical services to arrive without initiating CPR can significantly reduce the chances of survival for the individual experiencing cardiac arrest.