Impact of Cardiac Rhythm on Mitral Valve Area Calculated by the Pressure Half Time Method in Patients With Moderate or Severe Mitral Stenosis

Changes in cardiac rhythm with associated modifications of Cn can alter the accuracy of the PHT method for estimating MVA. Given the limitation described here, 2-dimensional planimetry, not the PHT method, should be used as a primary echocardiographic tool for MVA calculation.