Refractory heart failure (stage D): torasemide
12-year-old Poodle with MMVD on pimobendan, benazepril, spironolactone and furosemide, the dose of which has been raised to over 8 mg/kg/day. It has had pulmonary oedema twice in one month. Sinus rhythm. Creatinine 1.9 mg/dL (0.5–1.5), normal potassium.
What is the most appropriate change in treatment?
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A. Add carvedilol to curb sympathetic activation
Beta-blockers are not recommended in active congestive heart failure due to MMVD: they have shown no benefit and may cause decompensation by reducing contractility and heart rate.
B. Replace furosemide with torasemide and check renal function and electrolytes in 3–7 days
Correct. With more than 6–8 mg/kg/day of furosemide and recurrent oedema, the dog is in stage D. Torasemide is a more potent, longer-acting loop diuretic, useful when furosemide resistance develops. Some further azotaemia is expected and accepted if the dog is stable.
C. Stop furosemide because of the azotaemia
Mild azotaemia is common and tolerable in advanced heart failure. Withdrawing the diuretic in a dog with recurrent oedema would cause another, potentially fatal, decompensation.
D. Add digoxin as the usual next step
Digoxin is mainly reserved for rate control in atrial fibrillation; in sinus rhythm it is not a standard stage D step and has a narrow therapeutic margin, made worse by azotaemia.
lightbulb Key takeaway
Other stage D options: increase pimobendan to three times daily (off-label), add hydrochlorothiazide under close monitoring (sequential nephron blockade, risk of severe azotaemia and hypokalaemia) and drain effusions or ascites that compromise breathing. Always titrate to the lowest dose that keeps the resting respiratory rate below 30 breaths/min.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.