High dose furosemide in refractory cardiac failure.

Area of Science:

• Cardiology
• Nephrology
• Pharmacology

Background:

• High-dose furosemide is standard for renal failure but rarely used in cardiac failure.
• Furosemide elimination relies on renal excretion, raising concerns about accumulation in renal failure.
• Lower-dose furosemide combined with thiazides can be unpredictable and hazardous for cardiac failure.

Purpose of the Study:

• To evaluate the efficacy and safety of high-dose furosemide in severe cardiac failure.
• To determine if high-dose furosemide is a viable treatment for refractory heart failure.

Main Methods:

• 24 patients with severe cardiac failure received high-dose furosemide (>= 0.5 g/day) for at least four weeks.
• Mean maintenance dose was 0.7 g/day, with a maximum average dose of 1.3 g/day.
• One patient successfully received a peak dose of 8 g/day.

Main Results:

• All patients showed improvement when furosemide dosage reached or exceeded 0.5 g/day.
• No major adverse events were reported; minor side effects included new-onset gout (4 patients) and tinnitus (1 patient).
• Hypokalemia was manageable with spironolactone or potassium supplements.

Conclusions:

• High-dose furosemide is a logical and effective therapy for severe cardiac failure, complementing other treatments.
• Cautious administration of high-dose furosemide appears relatively safe.
• The maximum safe dose may be comparable to that used in renal failure.