Which drug is commonly used in combination with furosemide to treat canine congestive heart failure?

Which drug is commonly used in combination with furosemide to treat canine congestive heart failure?

• A. Digoxin
• B. Prednisone
• C. Enalapril
• D. Spironolactone

Answer: (A)

The important idea is that furosemide helps remove excess fluid, but adding a drug that strengthens heart contractions can make the treatment more effective. Digoxin increases the force of the heart’s contractions by inhibiting a membrane pump in cardiac cells, which raises intracellular calcium during systole. This boosts cardiac output and can improve signs of congestive heart failure when used alongside a diuretic like furosemide. It’s particularly helpful in dogs with poor heart muscle function and can help control heart rate in certain arrhythmias, though it requires careful monitoring because its therapeutic window is narrow and shifts in electrolytes (often from diuretic use) can affect safety. Other drugs like prednisone, enalapril, or spironolactone are also used in heart failure management, but digoxin is a classic adjunct specifically aimed at enhancing contractility when combined with diuretic therapy.

The important idea is that furosemide helps remove excess fluid, but adding a drug that strengthens heart contractions can make the treatment more effective. Digoxin increases the force of the heart’s contractions by inhibiting a membrane pump in cardiac cells, which raises intracellular calcium during systole. This boosts cardiac output and can improve signs of congestive heart failure when used alongside a diuretic like furosemide. It’s particularly helpful in dogs with poor heart muscle function and can help control heart rate in certain arrhythmias, though it requires careful monitoring because its therapeutic window is narrow and shifts in electrolytes (often from diuretic use) can affect safety. Other drugs like prednisone, enalapril, or spironolactone are also used in heart failure management, but digoxin is a classic adjunct specifically aimed at enhancing contractility when combined with diuretic therapy.