Which parameter is commonly used as a preload indicator to guide fluid therapy?

Which parameter is commonly used as a preload indicator to guide fluid therapy?

• A. CVP
• B. MAP
• C. PAP
• D. PCWP

Answer: (A)

Preload reflects how much the ventricles are filled at the end of diastole, and central venous pressure provides a practical estimate of this filling status. A central venous line measures right atrial pressure, which mirrors venous return to the heart and helps indicate whether preload is low, adequate, or high. When preload is low, a fluid bolus can improve stroke volume; when preload is high, additional fluids may worsen congestion. Systemic mean arterial pressure tells you about perfusion pressure, not how full the ventricles are at end-diastole. Pressures in the pulmonary artery or the left atrium (as estimated by wedge pressure) reflect other compartments and are more invasive, so they’re less commonly used purely to guide initial fluid therapy in routine pediatric care. CVP remains a commonly used preload indicator because it directly relates to venous return and is readily obtainable with central venous access, even though it’s not a perfect predictor of fluid responsiveness.

Preload reflects how much the ventricles are filled at the end of diastole, and central venous pressure provides a practical estimate of this filling status. A central venous line measures right atrial pressure, which mirrors venous return to the heart and helps indicate whether preload is low, adequate, or high. When preload is low, a fluid bolus can improve stroke volume; when preload is high, additional fluids may worsen congestion. Systemic mean arterial pressure tells you about perfusion pressure, not how full the ventricles are at end-diastole. Pressures in the pulmonary artery or the left atrium (as estimated by wedge pressure) reflect other compartments and are more invasive, so they’re less commonly used purely to guide initial fluid therapy in routine pediatric care. CVP remains a commonly used preload indicator because it directly relates to venous return and is readily obtainable with central venous access, even though it’s not a perfect predictor of fluid responsiveness.