Thiazolidinediones, including pioglitazone, can precipitate or worsen heart failure due to fluid retention and peripheral edema. Use is contraindicated in patients with NYHA class III–IV heart failure.
Contraindicated in moderate‑to‑severe heart failure (NYHA III‑IV).
Fluid retention can occur within weeks of therapy initiation.
Monitor weight daily; a gain >2 kg in 1 week warrants evaluation.
Consider alternative agents (e.g., SGLT2 inhibitors) that have proven cardiovascular benefit.
Pioglitazone activates peroxisome proliferator‑activated receptor‑γ (PPAR‑γ), leading to increased renal sodium reabsorption, enhanced vascular permeability, and adipocyte differentiation. These effects promote extracellular fluid expansion, peripheral edema, and increased cardiac preload, which can decompensate pre‑existing heart failure.
Patients may develop rapid weight gain, peripheral edema, dyspnea, and worsening of NYHA functional class. Hospitalization for acute decompensated heart failure and increased mortality have been reported in clinical trials and post‑marketing surveillance.
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