Abstract

LUPI HERRERA, Eulo et al. Clinical-hemodynamic correlation of the NYHA/WHO system in idiopathic pulmonary artery hypertension: Clinical, therapeutic and long-term prognosis implications. Arch. Cardiol. Méx. [online]. 2008, vol.78, n.2, pp.148-161. ISSN 1665-1731.

Background: The most often used functional classification for categorizing the degree of cardiac disability in patients with chronic left ventricular failure is the NYHA/WHO system. In Idiopathic Pulmonary Arterial Hypertension [I-PAH], this system although used, has not been studied in detail regarding pulmonary hemodynamic parameters association and for long-term prognosis in each of the NYHA/WHO classes. Methods: We retrospectively, studied the NYHA/ WHO system in 83 I-PAH patients. Patients were separated according to the response in the acute vasodilator trial in responders [n = 30] and nonresponders [n = 53]. Results: Classes I - II did not represent the minority population for I-PAH patients [58/83 = 60%]. Only mean right atrial pressure [mRAP] and mean pulmonary artery pressure [mPAP] were different among the NYHA/WHO functional classes [p < 0.000 and p < 0.012; respectively]. I-PAH patients class I have the probability to be a responder 12.6 times more [Cl 95.%: 4.59-40.62; p < 0.000]. The long-term mortality for class I patients was 0.%, for class II: 2.%, for class III: 28.% and for class IV: 63.% [p < 0.0001]. The follow-up change for one grade class of the NYHA/WHO classes at four years was noticed only in 20.% of the I-PAH patients. Conclusions: NYHA/WHO classes l-ll did not represent the minority of I-PAH patients population as has been previously considered. Only mRAP and mPAP were different among the NYHA/WHO classes. The NYHA/ WHO system on the basis of mRAP and mPAP allows to separate classes l-ll from III-IV. I-PAH patients class I have 12.6 times more the probability to be a responder and better long-term survival; irrespective of the treatment the prognosis seems to be excellent for this functional class group patients.

Keywords : Idiopathic pulmonary hypertension; NYHA/WHO system; Chronic left ventricular failure.

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