A 50-Year-Old Man Has Recurrent Episodes of Paroxysmal Atrial Fibrillation

question 441

Multiple Choice

A 50-year-old man has recurrent episodes of paroxysmal atrial fibrillation accompanied by uncomfortable palpitations and chest pressure.  Echocardiogram reveals normal biventricular function and no significant valvular disease.  Coronary angiography reveals no obstructive coronary artery disease.  The patient is started on medication to reduce his symptoms.  Two weeks later, he is seen in the emergency department for lightheadedness, weakness, and presyncope.  ECG reveals sinus bradycardia at a rate of 53/min with QTc prolongation (508 msec) .  Telemetry monitoring reveals a short episode of self-resolved torsades de pointes.  Which of the following medications was most likely used to treat this patient's palpitations?

• A)Diltiazem
• B)Metoprolol
• C)Mexiletine
• D)Ranolazine
• E)Sotalol

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Definitions:

Machine-Hours

A measure of production activity that quantifies the number of hours machines are run in the manufacturing process.

Job-Order Costing System

An accounting system that accumulates costs by individual jobs or orders, used in manufacturing and service environments where each job is distinct.

Predetermined Overhead Rate

A rate used to allocate manufacturing overhead costs to products, calculated before the period begins based on an estimate of total overhead costs and an allocation base.

Manufacturing Departments

Specific sections within a manufacturing facility where distinct stages of the production process are carried out, such as assembly or painting.