CVP monitoring most directly reflects which cardiac preload and fluid status?

• A. Left ventricular systolic function
• B. Right ventricular preload and fluid status
• C. Pulmonary capillary wedge pressure
• D. Cardiac output only

Answer: (B)

The key idea is that central venous pressure directly reflects the right heart’s preload and the body’s venous fluid status. CVP measures the pressure in the right atrium via a central venous line, which mirrors how much blood is returning to the heart and how well the right ventricle is filling and coping with that volume. A higher CVP often indicates greater right-sided preload or venous congestion, while a lower CVP suggests reduced preload or hypovolemia.

Left ventricular systolic function isn’t captured by CVP because that reflects the heart’s pumping ability, not the filling pressure of the right side. Pulmonary capillary wedge pressure measures left atrial pressure and, therefore, left-sided preload, making it more direct for assessing left heart filling. Cardiac output is a calculation influenced by preload, contractility, and afterload, but CVP itself does not measure CO.