Right-ventricular afterload can be estimated by using which equation?

a. (MAP) ? (SV) ? (0.00136) c. (MAP – MRAP/CO) ? 80
b. (MPAP) ? (SV) ??(0.00136) d. (MPAP – MLAP/CO) ? 80

ANS: C
The right-ventricular afterload is the resistance the right ventricle must overcome to eject blood and is estimated from calculations of pulmonary vascular resistance, which is expressed as mean pulmonary artery pressure (MPAP) minus mean left atrial pressure (MLAP) divided by cardiac output or pulmonary blood flow multiplied by a factor of 80.