Resposta cardiovascular ao exercício em pacientes portadores de hipertensão arterial pulmonar / Cardiovascular response to exercise in patients with pulmonary arterial hypertension

AUTOR(ES)

Bruno Arantes Dias

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

01/09/2011

RESUMO

The proper understanding of the cardiovascular response to exercise has a central role in the management and treatment of patients with pulmonary arterial hypertension (PAH). However, data concerning the evolution of pulmonary vascular mechanics and right ventricular adaptation to effort are scarce. The aim of this study is characterize the cardiovascular response to exercise in these patients. We selected 30 patients with PAH (Group 1 Dana Point) and 7 controls with normal invasive hemodynamics between December 2009 and November 2010 who underwent a symptom-limited exercise protocol on cycle ergometer. Were evaluated the behavior of hemodynamic parameters, pulmonary vascular mechanics and B-type natriuretic peptide during stress in patients and compared their response with controls. The PAH group showed elevation of mPAP greater than the controls, with the same elevated PCWP and HR response between the groups. Cardiac output at peak exercise was lower in the PAH patients with no change of stroke volume during effort. Compliance and pulmonary vascular resistance have decrease in PAH group, remaining with lower compliance and higher resistance at peak exercise compared to controls. These variables are inversely related at rest and during every step of the effort, strengthening the power of this relation and the role of CVP in evaluation of these patients. However, the behavior of resistance is not uniform in all PAH patients and may be separated into three distinct groups: rise, fall and maintenance during exercise. The BNP raises during exercise in PAH group, but the values of baseline BNP already has an stronger inverse correlation with peak CO, better than the correlation of peak exercise BNP with the same variable. BNP at peak exercise and the variation of BNP peak - baseline were not superior to baseline BNP in discriminating the response of the CO during exercise, when evaluated by ROC curves. These findings reinforce the role of baseline BNP in evaluating patients with PAH

ASSUNTO(S)

cardiovascular physiological phenomena esforço físico pulmonary hypertension exercício exercise fenômenos fisiológicos cardiovasculares hemodinâmica hemodynamics hipertensão pulmonar natriuretic peptides peptídeos natriuréticos physical exertion

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