What is the objective of the fluid bolus before administering vasopressor therapy in bradycardia management?

• A. To raise MAP to ≥65 mmHg and SBP ≥90 mmHg.
• B. To reduce heart rate
• C. To slow AV conduction
• D. To decrease glucose

Answer: (A)

In this scenario the key idea is that a fluid bolus aims to restore adequate perfusion by increasing preload to raise blood pressure. Giving isotonic fluids expands intravascular volume, improves venous return, and boosts stroke volume through the Frank-Starling mechanism, helping MAP reach about 65 mmHg and SBP around 90 mmHg. Achieving these targets provides better organ perfusion and creates a stable baseline before starting vasopressors. This step is not about reducing heart rate, slowing AV conduction, or changing glucose levels—those are not the goals of giving fluids.