[Echocardiographic findings in children with "innocent" murmur].

Objectives: To access the frequency of abnormal echocardiographic findings in patients with diagnosis of innocent murmur.

Methods: A transversal study of 166 consecutive patients was carried out with diagnosis of innocent murmur evaluated in the pediatric cardiology outpatient clinic of "Instituto de Cardiologia/Fundação Universitária de Cardiologia", a tertiary reference center, between December 3, 2001 and December 2, 2002. History, clinical examination and echocardiogram were performed in all patients. Post-test probabilities of disease with positive and negative clinical examination were estimated, considering the echocardiogram as gold standard.

Results: Of the 166 patients evaluated, 11 showed some alteration in the echocardiogram: pulmonary stenosis (4), patent foramen ovale (2), atrial septal defect (1), bicuspid aortic valve (2), minimum aortic regurgitation (1) and ventricular septal defect (1). Negative post-test probability (probability of disease with diagnosis of innocent murmur) was of 6.6%.

Conclusion: In a referral outpatient clinic the proportion of minor lesions is high in patients with diagnosis of innocent murmur. These injuries may not be related to the heart murmur, as in the patent foramen ovale and bicuspid aortic valve. However, they raise the question of the indication of echocardiogram taking into account the low risk of detected lesions and, on the other hand, the resolutive character of a daycare reference center.