Author + information
- Received February 9, 1988
- Revision received May 31, 1988
- Accepted June 16, 1988
- Published online November 1, 1988.
- Pui-Kan Liao, MD,
- Wen-Jen Su, MD and
- Jui-Sung Hung, MD, FACC∗
- ↵∗Address for reprints: Jui-Sung Hung, MD, Department of Internal Medicine, Chang Gung Memorial Hospital, 199 Tung Hwa North Road, Taipei, Taiwan, Republic of China 10591.
Eighteen infants and children with isolated ductus arteriosus and various hemodynamic states were examined with the Doppler color flow mapping technique to study the flow patterns of the patent ductus and its adjacent structures. Direct visualization of the ductus was achieved in all patients. All ductal flow was shunting left to right from the descending aorta to the pulmonary artery even in the presence of significant elevation of pulmonary artery pressure. However, transient bidirectional shunting was observed in two patients on serial studies. Disturbed systolic and diastolic flows were demonstrated within the ductus in each case.
The blood flows in the main pulmonary artery consisted of three distinguishable areas: 1) a characteristic high velocity turbulent retrograde ductal jet throughout the entire cardiac cycle, located in the anterolateral aspect of the main pulmonary artery; 2) nonspecific low velocity retrograde late systolic and early diastolic flow, located in the posteromedial aspect of the mata pulmonary artery; and 3) low velocity forward systolic and diastolic flow, occupying the remaining area of the pulmonary artery. The blood flows in the descending aorta pear the ductal orifice consisted of disturbed systolic and diastolic flows in a reversed direction.
By providing detailed real time blood flow information with simultaneous imaging of the ductus, Doppler color flow mapping greatly facilitates the detection of a small ductal shunt. This technique also allows detection of a bidirectional or right to left ductal shunt.
- Received February 9, 1988.
- Revision received May 31, 1988.
- Accepted June 16, 1988.