1. When providing BLS care, what is the recommended compression-toventilation ratio for a single rescuer of an adult victim? - A) 15:2 - B) 30:2 - C) 5:1 - D) 10:1 Answer: B) 30:2. The recommended ratio allows for adequate circulation while minimizing interruptions in chest compressions. 2. During two-rescuer CPR, when should the rescuers switch roles? - A) After every 5 cycles of CPR - B) After 2 minutes - C) When the rescuer performing compressions becomes fatigued - D) Only when an AED becomes available Answer: B) After 2 minutes. Regular switching prevents fatigue and ensures the effectiveness of compressions. 3. What is the first step in the BLS sequence? - A) Open the airway - B) Check for breathing - C) Start chest compressions - D) Check for responsiveness Answer: D) Check for responsiveness. This determines if the victim needs CPR and if emergency services should be called. Question: What is the first step in the management of a witnessed cardiac arrest situation? A. Begin CPR immediately B. Assess the patient's airway C. Call for help D. Check for a pulse Answer: C. Call for help Rationale: Calling for help ensures that additional resources and support are available to assist in the resuscitation efforts. Question: Which rhythm is most commonly associated with sudden cardiac arrest?