A Study Is Conducted to Assess the Effect of Beta-Blocker

question 34

Multiple Choice

A study is conducted to assess the effect of beta-blocker therapy in patients with acute myocardial infarction (MI) .  The study found that 20 patients out of 90 who took a beta-blocker during the week prior to developing an MI had a major arrhythmia event during hospitalization.  The study also determined that 30 patients out of 70 who did not take any beta-blocker developed a major arrhythmia.  What was the odds ratio of developing major arrhythmia in patients who took beta-blockers compared to those who did not take beta-blockers?

• A)(20 × 30) / (70 × 40)
• B)(20 × 40) / (70 × 30)
• C)(20 × 70) / (30 × 40)
• D)(20 / 50) / (70 / 110)
• E)(20 / 90) / (30 / 70)

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