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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The initial pharmacologic therapy of choice in this stable patient (refer to Q 87) is
assistant
The correct answer is  Vagotonic maneuvers such as carotid massage or the Valsalva maneuver could ceainly be tried first. If these are unsuccessful, adenosine, with its excellent safety profile and extremely sho half-life, is the drug of choice for supraventricular tachycardia at an initial dose of 6 mg. Dosage can be repeated if necessary a few minutes later at 12 mg. Verapamil is the next alternative; if the initial dose of 2.5 to 5 mg does not yield conversion, one or two additional boluses 10 min apa can be used. Diltiazem and digoxin may be useful in rate control and conversion, but have a much slower onset of action.