**Core Concept:** The American Heart Association (AHA) provides guidelines for cardiopulmonary resuscitation (CPR) which involve chest compressions (CCs) and artificial ventilation (AV). In the AHA 2010 guidelines, these two components are performed by two individuals in an adult patient.

**Why the Correct Answer is Right:** In the AHA 2010 guidelines for CPR, the recommended approach is to have two individuals performing CPR to improve the effectiveness of chest compressions and ventilation. This allows for more consistent and deeper compressions, as well as better synchronization of compressions and ventilations. Compressions are performed at a rate of 100-120 per minute, depth of 5-6 cm, and ratio of 30:2 for CCs:AV.

**Why Each Wrong Option is Incorrect:**

A. Performing CPR by a single individual: This option is incorrect because it does not meet the guidelines' recommendation for improved CPR effectiveness through teamwork.

B. Performing CPR at a rate of 200 per minute: The correct rate is 100-120 compressions per minute, not the provided 200.

C. Performing AV ratio of 20:1: The correct ratio is 30:2 (30 chest compressions followed by two ventilations), not the provided 20:1.

D. Not following the depth of 5-6 cm: The correct depth for compressions is 5-6 cm, not the provided depth (which could refer to a different aspect of CPR technique).

**Clinical Pearl:** In CPR, adhering to the recommended guidelines is crucial for optimal patient outcomes. Inefficient CPR techniques can lead to suboptimal oxygenation and circulation restoration, potentially worsening patient outcomes.

**Correct Answer:** B. Performing CPR at a rate of 100-120 compressions per minute - The correct rate for adult CPR is between 100-120 compressions per minute, not the provided 200 compressions per minute.