
The impact of tricuspid regurgitation (TR) on right ventricular (RV) function and prognosis in pulmonary arterial hypertension (PAH) remains unclear. In a study of 92 PAH patients, TR volume ≥30 mL was associated with poor event-free survival. TR correlated with elevated NT-proBNP and mean right atrial pressure, indicating RV dysfunction. Simulations suggest tricuspid valve repair may increase RV myocardial oxygen consumption in PAH patients with severe TR and low RV contractility. Effective pulmonary arterial elastance (Epa) correlated better with RV dysfunction than arterial elastance. These findings highlight TR's prognostic significance and its association with low RV contractility in PAH.
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