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Non-invasive assessment of isolated atrial defects.

This study attempts to predict the size of shunt in secundum atrial septal defects by non-invasive M-mode echocardiography. The areas under the excursions of the mitral and tricuspid valves were measured with a sonic digitiser and the ratio of these areas compared with the shunt size as obtained at c'atheterisation. The relation between the mitral and tricuspid valve areas in patients with atrial septal defect is significantly different from that in healthy subjects. There is a significant positive correlation between the ratio of mitral and tricuspid valve areas and the shunt size.