Mean Right Atrial Pressure for Estimation of Left Ventricular Filling Pressure in Patients with Normal Left...

There is a paucity of data on the utility of right atrial pressure (RAP) for estimating pulmonary capillary wedge pressure (PCWP) in patients with normal ejection fraction (EF), including patients with heart failure with preserved EF.

Mean RAP was compared with PCWP in 129 patients (mean age, 61 ± 11 years; 45% men) with exertional dyspnea enrolled in a multicenter study. Measurements included left ventricular volumes, EF, and mitral inflow velocities.

Mean PCWP was 14 ± 7 mm Hg, and mean RAP was 8 ± 5 mm Hg. A significant relation was present between mean RAP and mean PCWP (r² = 0.5, P < .001). RAP > 8 mm Hg had 76% sensitivity and 86% specificity in detecting mean PCWP > 12 mm Hg. In 101 patients with inconclusive mitral filling pattern (defined according to American Society of Echocardiography/European Association of Cardiovascular Imaging 2016 diastolic function recommendations), RAP by catheterization had sensitivity of 73% and specificity of 91%. In a subset of 59 patients with echocardiographic assessment of mean RAP, RAP by echocardiography had sensitivity of 76% and specificity of 89%.

Mean RAP provides useful information about mean PCWP in many patients with normal left ventricular EF. There is good sensitivity and excellent specificity when combining invasive or noninvasive RAP and mitral velocities to determine if PCWP is elevated.