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Arquivos Brasileiros de Cardiologia
On-line version ISSN 1678-4170
MADY, Charles et al. Relation between left atrial dimension and exercise capacity in endomyocardial fibrosis. Arq. Bras. Cardiol. [online]. 2005, vol.84, n.3, pp.222-224. ISSN 1678-4170. http://dx.doi.org/10.1590/S0066-782X2005000300005.
OBJECTIVE: To assess whether exercise capacity is related to left atrial dimension (LAD) in patients with biventricular endomyocardial fibrosis. METHODS: This study comprised 38 patients in sinus rhythm, with a mean age of 37.5 ± 11.5 years (range, 11 to 59 years), 25 of whom were women. They were divided into 2 groups according to the NYHA functional class on hospital admission as follows: group A (12 patients) and group B (26 patients). All patients underwent cardiopulmonary exercise testing to determine their maximum oxygen consumption (VO2 max), and their left atrial dimension was determined on echocardiography. RESULTS: The VO2max values for groups A and B were 21.8 ± 4.8 mL.kg-1.min-1 and 13.7 ± 3.5 mL.kg-1.min-1, respectively, and the left atrial dimensions were 3.7±0.7cm and 4.4±0.7cm for groups A and B, respectively. A significant and inverse correlation was found between VO2max and LAD in the groups studied. CONCLUSION: The increase in left atrial dimension is associated with impairment in exercise capacity in patients with endomyocardial fibrosis. Our findings support the use of left atrial dimension to estimate a more complex and difficult to assess index of functional capacity, such as VO2max.
Keywords : left atrial dimension; exercise capacity; endomyocardial fibrosis.