The assessment of the jugular vein primarily reflects the filling pressure of which part of the heart?

• A. Right side
• B. Aorta
• C. Left side
• D. Both ventricles

Answer: (A)

Jugular venous pressure reflects the pressure in the central venous system, which mirrors the filling pressure of the right side of the heart—in particular, the right atrium. The jugular veins drain into the right atrium via the superior vena cava, so the height of the venous column tells us the right atrial pressure (central venous pressure) and thus right-sided preload. Left-sided pressures (left atrium or left ventricle) aren’t directly measured by JVP; they influence the lungs and systemic circulation rather than the jugular venous column. In practice, elevated JVP signals elevated right-sided filling pressures, often from right heart or overall volume status, whereas left-sided pressures aren’t assessed by this sign.