What is the significance of a biphasic pericardial friction rub in the evaluation of acute pericarditis?

Updated: Apr 02, 2019
  • Author: Sean Spangler, MD; Chief Editor: Terrence X O'Brien, MD, MS, FACC  more...
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The biphasic to-and-fro rub is less common (24%). It can occur with tachycardia and is due to summation of the atrial and early diastolic rub. Monophasic rubs (the ventricular systolic) are the least common but may occur in patients with atrial fibrillation.

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