Which factor is directly related to CVP changes?

Which factor is directly related to CVP changes?

• A. Blood pressure
• B. Heart rate
• C. Breath rate
• D. Venous return to the heart

Answer: (D)

Central venous pressure reflects the pressure in the right atrium, i.e., the preload on the right heart. The factor that changes CVP most directly is venous return—the blood flowing back to the heart. When venous return increases, more blood fills the right atrium, raising the pressure and thus CVP; when venous return decreases, CVP falls. Blood pressure, heart rate, and breathing rate influence circulation in broader ways, but they don’t determine CVP as directly as venous return does.