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Patient
74-year-old man with dystrophic mitral regurgitation;
Trace
Sinus rhythm; left atrial enlargement (large P wave duration > 120 ms, biphasic in leads I, II, V3-V6, negative widened component in V1); possible left ventricular hypertrophy (increase in R wave amplitude in V3, V4) of the diastolic type (positive T waves in the left precordium);
Exergue
During chronic mitral regurgitation, the volumetric overload of the left atrium and left ventricle explains the electrical signs of left atrial enlargement and diastolic left ventricular hypertrophy.
This patient has a typical electrocardiogram of chronic mitral regurgitation. Mitral regurgitation is characterized by the systolic reflux of part of the blood from the left ventricle to the left atrium due to incomplete valve closure.