Pulmonary vein flow pattern in patients with bidirectional cavopulmonary connection or Fontan circuit
© Shariat et al; licensee BioMed Central Ltd. 2011
Published: 2 February 2011
To compare the systolic component of pulmonary vein flow in subjects with biventricular circulation and in those with functionally univentricular circulation and to determine if any of S1 or S2 are dependent on forces created by right ventricle.
Patients and methods
We assessed pulmonary vein flow pattern in 12 cases (39 pulmonary veins) with RV-independent pulmonary circulation (Bidirectional cavopulmonary connection [BCPC] or Fontan circulation). Phase-contrast imaging of the pulmonary veins was performed on a 1.5 T MR scanner with velocity encoding set at 120 cm/s. We compared these flow patterns with the flow patterns of a control group of 10 patients (15 pulmonary veins) who had RV-dependant pulmonary circulation and underwent CMR due to other reasons (Coarctation of Aorta, Atrial Septal Defect).
This study further supports the concept that the late systolic pulse (S2) of the pulmonary vein flow curve is caused by forward propagation of the right ventricular systolic pressure pulse. It also demonstrates that the early systolic pulse (S1) is independent of the right ventricle but dependent on the left atrial and left ventricular events.
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