Q. Which of the following is the most common complication of the bacterial   endocarditis?

     A. Glomerulonephritis
     B. Congestive heart failure
     C. Renal infarction and abscess
     D. Brain abscess
     E. Splenomegaly

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The correct answer is B. Congestive heart failure. Also, CHF is the most common cause of death in endocarditis. Before the antibiotic-era glomerulonephritis was a very common complication.