Swan-Ganz Pressure Values in Right Ventricular Dysfunction
In right ventricular dysfunction, you will see elevated right atrial pressure (RAP) >12 mmHg, elevated right ventricular end-diastolic pressure, normal or low pulmonary capillary wedge pressure (PCWP <15 mmHg if isolated RV dysfunction), and reduced cardiac index <2.2 L/min/m².
Hemodynamic Profile
The characteristic Swan-Ganz catheter findings in RV dysfunction depend on whether the dysfunction is isolated or secondary to left heart disease:
Isolated RV Dysfunction (Primary RV Failure)
Key pressure patterns include:
- Elevated RAP: Typically >12 mmHg, often 16 mmHg or higher in severe cases 1, 2
- Normal or low PCWP: <15 mmHg, distinguishing this from left heart failure 2
- Elevated pulmonary artery pressures: Mean PAP ≥25 mmHg with increased pulmonary vascular resistance (PVR) >3 Wood units when pulmonary hypertension is the cause 2
- Reduced cardiac output/index: Cardiac index typically <2.2 L/min/m² in decompensated states 1
- Elevated CVP to PCWP ratio: >0.63 suggests biventricular failure 3
RV Dysfunction Secondary to Left Heart Disease
When RV dysfunction occurs due to left-sided heart failure (the most common scenario), you will observe:
- Elevated RAP: >12 mmHg 1
- Elevated PCWP: >15-18 mmHg, reflecting elevated left atrial pressure 1, 2
- Elevated pulmonary artery pressures: Both systolic (>50 mmHg) and mean pressures elevated 1
- Reduced cardiac index: <2.2 L/min/m² 1
Critical Diagnostic Distinction
The PCWP is the critical discriminator: Normal PCWP (<15 mmHg) with elevated RAP suggests isolated RV dysfunction or pulmonary hypertension, while elevated PCWP (>15 mmHg) with elevated RAP indicates RV dysfunction secondary to left heart disease 2. This distinction is essential because management strategies differ fundamentally—isolated RV failure may benefit from pulmonary vasodilators, while RV dysfunction from left heart disease requires treatment of the underlying left ventricular pathology 2.
Additional Hemodynamic Findings
Right ventricular stroke work index will be reduced in RV dysfunction 3. The presence of elevated right ventricular end-diastolic pressure with preserved or elevated RAP confirms impaired RV compliance and function 4, 5.
Common Pitfall
Avoid excessive diuresis based solely on elevated RAP in isolated RV dysfunction. Patients with RV failure may have normal or low LV filling pressures despite elevated right-sided pressures. Aggressive diuresis can precipitate prerenal azotemia, hypotension, and worsening cardiac output 2. The key is to use PCWP to guide volume management—if PCWP is normal or low despite elevated RAP, cautious diuretic use is warranted.