Review the EKG shown below, which displays rapid, erratic electrical impulses causing ineffective quivering instead of coordinated contraction. What should be the nurse's initial intervention?

C Administer Furosemide intravenously before considering other treatments. B Initiate cardiopulmonary resuscitation (CPR) immediately and prepare for defibrillation. A Place the patient in a left lateral position and monitor vital signs. D Perform a thorough assessment to determine the cause of the arrhythmia before intervening.