Diuretic Therapy in Acute Heart Failure
Initial Approach: IV Bolus (Push)
- The European Society of Cardiology recommends starting with IV bolus administration of furosemide 20-40 mg given slowly over 1-2 minutes for patients with acute heart failure 1, 2, 3
- IV bolus allows for easier titration based on immediate clinical response, and is considered the standard of care as first-line therapy 1, 2
- The initial bolus dose can be repeated with increments of 20 mg, no sooner than 2 hours after the previous dose, if there is an inadequate response 1, 2
Transition to Continuous IV Infusion (Drip)
- The European Society of Cardiology suggests considering switching to continuous IV infusion after initial bolus in patients with volume overload who require higher doses or demonstrate inadequate response to bolus therapy 1, 2, 3
- Continuous infusion is more effective than high-dose bolus in achieving sustained diuresis, and reduces the risk of reflex vasoconstriction 4
- The American Heart Association recommends giving an initial bolus first, then starting the infusion 1, 2
Clinical Monitoring Algorithm
- The European Heart Journal recommends assessing response within 1-2 hours, with adequate response defined as urine output >100 mL/hour 6
- If there is an inadequate response to the initial bolus, the dose can be doubled up to furosemide 500 mg equivalent, or continuous infusion can be considered 6, 1, 2
Critical Pitfalls and Contraindications
- The European Society of Cardiology advises avoiding diuretics entirely in patients with hypotension (SBP <90 mmHg), severe hyponatremia, acidosis, or anuria 1, 2, 3
- High-dose bolus risks include reflex vasoconstriction, ototoxicity, and excessive neurohormonal activation 4, 5