E/e′ ratio in patients with unexplained dyspnea lack of accuracy in estimating left ventricular filling pressure

Academic Article

Abstract

  • Background-Elevated left ventricular filling pressure is a cardinal feature of heart failure with preserved ejection fraction. Mitral E/e′ ratio has been proposed as a noninvasive measure of left ventricular filling pressure. We studied the accuracy of E/e′ to estimate and track changes of left ventricular filling pressure in patients with unexplained dyspnea. Methods and Results-We performed supine and upright transthoracic echocardiography in 118 patients with unexplained dyspnea who underwent right heart catheterization. Supine E/e′ ratio modestly but significantly correlated with supine pulmonary arterial wedge pressure (PAWP; r=0.36; P<0.001) and demonstrated poor agreement with PAWP values (Bland-Altman limits of agreement of -8.3 to 8.3 mm Hg; range, 6.5-21.2 mm Hg). Similarly, E/e′ ratio cut off of 13 performed poorly in identifying patients with elevated left ventricular filling pressure (sensitivity 6%, specificity 90%). The receiver-operating characteristic area of E/e′ was 0.65 (95% confidencce interval, 0.50-0.79). With change from the supine to upright position, PAWP decreased (-5±4 mm Hg; P<0.001) as did both E wave (-17±15 cm/s; P<0.001) and e′ (-2.7±2.7 cm/s; P<0.001) velocities, whereas E/e′ remained stable (+0.2±2.6; P=0.57). Positional change in PAWP correlated modestly with change in E-wave (r=0.37; P<0.001) velocity. There was no appreciable relationship between change in PAWP and change in average E/e′ (r=-0.04; P=0.77) and in half the patients the change in PAWP and E/e′ were directionally opposite. Conclusions-In patients with unexplained dyspnea, E/e′ ratio neither accurately estimates PAWP nor identifies patients with elevated PAWP consistent with heart failure with preserved ejection fraction. Positional changes in E/e′ ratio do not reflect changes in PAWP.
  • Authors

    Published In

    Digital Object Identifier (doi)

    Author List

  • Santos M; Rivero J; McCullough SD; West E; Opotowsky AR; Waxman AB; Systrom DM; Shah AM
  • Start Page

  • 749
  • End Page

  • 756
  • Volume

  • 8
  • Issue

  • 4