A 55 year old man (weight 75 kg) arrives at the emergency department with severe chest pain. His heart rate is 40 and blood pressure is 70/50 mmHg. The monitor shows sinus bradycardia with an occasional premature ventricular complex. Which of the following drugs is indicated first?

CPR is in progress for an unwitnessed cardiac arrest. Immediately upon diagnosing ventricular fibrillation, one should:

After determining that the patient has no pulse, which one of the following forms of treatment would you use initially for the patient with ventricular fibrillation?

A 34 year old woman with a history of supraventricular tachycardia is brought into the emergency department She is lethargic, pale, and diaphoretic. Her heart rate is 190 beats per minute and her blood pressure is 70 mmHg palpable. Her ECG reveals recurrence of her supraventricular tachycardia. Supplemental oxygen is applied. Your intervention should be:

A 70 kg patient with a recent myocardial infarction is in the coronary care unit. He develops ventricular tachycardia and immediately loses consciousness. He is pulseless and not breathing. Which should be done first?