Why the study?
Does colour flow Doppler mapping improve the detection of pulmonary artery stenosis compared to routine echocardiography in patients with suspected pulmonary valve stenosis?
Does colour flow Doppler mapping improve the detection of pulmonary artery stenosis compared to routine echocardiography in patients with suspected pulmonary valve stenosis?
Colour flow Doppler mapping can reveal flow abnormalities and aid in diagnosing uncommon anomalies like pulmonary artery stenosis when routine 2D echocardiography is equivocal.
May aid detection of occult pulmonary artery membranes when 2D echo is normal; hypothesis-generating for routine colour flow use in suspected stenosis.
Colour flow Doppler mapping can show abnormalities of flow even when the echocardiographic image is equivocal. Routine echocardiography in two patients who were thought to have pulmonary valve stenosis and a ventricular septal defect initially appeared to be normal. Colour flow Doppler mapping, however, showed multiple flow aliasing within the pulmonary artery, approximately 1.5 cm downstream from the pulmonary valve. More detailed examination by cross sectional echocardiography showed a membrane at this level in both patients. It is possible that more cases of this uncommon anomaly will come to light with increasing use of Doppler techniques.
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Swan et al. (1990) studied this question.
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