• Clinical science
  • Physician

Mitral regurgitation (Mitral valve regurgitation)


Mitral regurgitation (MR) refers to the leakage of blood from the left ventricle to the left atrium due to incomplete closure of the mitral valve. The most common causes are primary diseases of the valve (e.g., mitral valve prolapse), although damage may also result secondary to other heart conditions such as left ventricular dilation and myocardial infarction. Symptoms such as palpitations or dyspnea appear late in the course of chronic compensated MR in which cardiac output can still be maintained. In acute or chronic decompensated MR, pulmonary edema and pulmonary hypertension often cause dyspnea, coughing, jugular venous distention, and pitting edema. Echocardiography is the most important diagnostic tool and allows for assessment of severity. It may also be used for preoperative evaluation. Treatment options include surgical mitral valve repair or replacement and percutaneous reconstruction. Early intervention is favored in most cases of MR with evidence of left ventricular dysfunction, regardless of symptoms.





Clinical features



  • Auscultation
  • ECG
  • Chest X-ray
    • Posterior-anterior image
      • LV enlargement: laterally displaced left cardiac border
      • LA enlargement: straightening of the left cardiac border
      • Signs of pulmonary congestion in late stages of disease (see “X-ray findings in pulmonary congestion”)
    • Lateral image: Narrowing of the retrocardiac space
  • Echocardiography: most important diagnostic method for detecting and assessing valvular abnormalities
    • Valve apparatus (e.g., dimensions of valve opening area, calcification, rupture of the chordae tendineae) and mobility
    • LV and LA size and function
  • Coronary angiography: prior to surgical intervention

Myocardial infarction must be ruled out in patients presenting with acute MR!





We list the most important complications. The selection is not exhaustive.

Acute management checklist

  • Initiate hemodynamic support for patients with unstable vitals.
  • Cardiology and cardiac surgery consult
  • Consider TEE
    • If TTE is inconclusive
    • For preoperative planning
  • Identify and treat the underlying cause (e.g., endocarditis, acute MI).
  • Consider definitive management options based on the underlying cause.
  • Continuous cardiac monitoring
  • Continuous pulse oximetry
  • Transfer to OR or ICU.