An Investigator Studies the Effects of 2 Different Medications on the Heart

question 66

Multiple Choice

An investigator studies the effects of 2 different medications on the heart rate of patients with persistent atrial fibrillation.  After participants receive therapeutic doses of medication for several days, their heart rates are measured for 24 hours at rest and during 10 minutes of moderate exercise.  The results are compared against placebo and shown in the graphs below.  Which of the following medications is most likely represented by the red line (drug 1) ?

• A)Amlodipine
• B)Atenolol
• C)Digoxin
• D)Lisinopril

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