Right Heart Catheterization Cheat Sheet: Interpretation of Pressures and Waveforms Direct measurements ● Central venous pressure (CVP) ● Right-sided intracardiac pressures (RA, RV) ● Pulmonary arterial pressure (PAp) ● Pulmonary capillary wedge pressure (PCWP) ● Cardiac output (CO) ● Mixed venous oxyhemoglobin saturation (SvO2) Indirect measurements ● Systemic vascular resistance (770-1500 d/s/cm5) (SVR = 80 x [mean artery pressure – CVP]/CO) ● Pulmonary vascular resistance (20-120 d/s/cm5) (PVR = 80 x [mean PAp – PCWP]/CO) ● Cardiac index (2.5-4 L/min/m2) (CI = CO/body surface area) ● Stroke volume index (33-47 ml/beats/m2) (SVI = CI/heart rate) ● Left ventricular stroke work index (LVSWI = [MAP – PCWP] x SVI x 0.136) ● Right ventricular stroke work index (RVSWI = [mean PAp – CVP] x SVI x 0.136) ● Oxygen delivery (DO2 = CI x 13.4 x Hb x SaO2) ● Oxygen uptake (VO2 = CI x 13.4 x Hb conc x [SaO2 – SvO2]) RA pressures and waveforms ● a wave:contraction in atrial systole ● x descent: fall in RA pressure (atrial diastole) ● c wave: closure of the tricuspid valve. ● v wave: ventricular systole + passive atrial filling in atrial diastole. ● y descent: fall in RA pressure following opening of the TV + passive filling of RV Usama Nasir MD @usamanasirmd - Visualmed #RHC #Interpretation #Diagnosis #RightHeartCatheterization #CheatSheet #Waveforms #Cardiology
