Home

ECHONOMY
Tools for Echocardiographic Calculations

Muhamed Saric, MD, PhD
New York University

 

PVR

Scope

To provide overview of common noninvasive estimates of pulmonary vascular resistance (PVR).

 

Methods

ARRITHMETIC METHOD

PVR = (MPAP - PAWP) / CO


MPAP, mean pulmonary artery pressure; PAWP, pulmonary artery wedge pressure; CO, cardiac output.
Ohm's law applied to hemodynamics
ABBAS METHOD

PVR = 10 * {Vmax of TR / VTIRVOT} + 0.16

Vmax of TR in m/sec; VTIRVOT in cm; PVR in Wood units.

J Am Coll Cardiol
2003;41:1021-7.

 
HADDAD METHOD

PVRI  = 1.97 + 190.71 * PASP / (HR * VTIRVOT)

PVRI, pulmonary vascular resistance (in WU/m2), PASP, pulmonary artery systolic pressure (in mm Hg); HR, heart rate (in beats per minute); VTIRVOT (in cm).

J Am Soc Echocardiogr
 2009;22:523-529.