1. Mitral Regurgitation in Ventricular Premature Contractions
Edward L. Yellin, Ph.D. 
CHEST 
Volume 79, Issue 3, Pages (March 1981)
DOI: /chest b
Copyright © 1981 The American College of Chest Physicians Terms and Conditions

2. FIGURE 1
An oscillographic record from a dog with electrically-induced extrasystoles. A: An early extrasystole with three atrial contractions (asterisks) all of which occur during diastole. B: A later extrasystole with the second atrial contraction occurring during ventricular systole when the mitral valve is closed. Although it appears to be a “v” wave suggestive of mitral regurgitation, the mitral flow trace shows no backflow (encircled trace). AoF: aortic flow; MiF: mitral flow; LVP, LAP: left ventricular, left atrial pressure. Arrows point to the stimulus artifact.
CHEST  , DOI: ( /chest b)
Copyright © 1981 The American College of Chest Physicians Terms and Conditions