Competitive pulmonary flow in infancy: the effect of respiration

Int J Cardiol. 1999 Jan;68(1):9-12. doi: 10.1016/s0167-5273(98)00318-0.


Superior caval flow during positive pressure mechanical ventilation and spontaneous breathing was investigated by Doppler echocardiography in a neonate with a coexisting superior cavopulmonary shunt and an aortopulmonary shunt. During positive pressure ventilation, retrograde systolic flow in the superior vena cava was recorded, with low velocity anterograde flow. This pattern was reversed during spontaneous respiration. Low intrathoracic pressure plays an important role in maintaining anterograde pulmonary blood flow in patients with this physiology.

Publication types

  • Case Reports

MeSH terms

  • Arteriovenous Shunt, Surgical
  • Echocardiography, Doppler
  • Fatal Outcome
  • Heart Defects, Congenital / diagnostic imaging
  • Heart Defects, Congenital / physiopathology
  • Heart Defects, Congenital / surgery*
  • Heart Ventricles / diagnostic imaging
  • Heart Ventricles / physiopathology*
  • Heart Ventricles / surgery*
  • Humans
  • Infant, Newborn
  • Positive-Pressure Respiration
  • Pulmonary Circulation / physiology*
  • Respiration*
  • Superior Vena Cava Syndrome / etiology
  • Ultrasonography, Doppler, Color