Right Ventricular Function After Pulmonary Artery Banding: Adaptive Processes Assessed by CMR and Conductance
Hubert Gufler1,2, Sabine Niefeldt3, Johannes Boltze4,5
1Department of Diagnostic and Interventional Radiology, University Clinic, Schillingallee 35, 10857, Rostock, Germany. hgufler@gmx.de.
Abstract:
This experimental study describes the adaptive processes of the right ventricular (RV) myocardium after pulmonary artery banding (PAB) evaluated by cine cardiac magnetic resonance (CMR), phase-contrast CMR (PC-CMR), and conductance catheter. Seven sheep were subjected to CMR 3 months after PAB. Conductance catheter measurements were performed before and 3 months after PAB. Four nonoperated, healthy, age-matched animals served as controls. Higher RV masses (p < 0.01), elevated RV end-systolic volumes (p < 0.05), and lower RV ejection fraction (p < 0.01) were observed in the operated group. The time-to-peak pulmonary artery flow was longer in the banding group (p < 0.01). RV maximal pressure and RV end-diastolic pressure correlated with the time-to-peak flow in the pulmonary artery (r = - 0.70 and - 0.69, respectively). In summary, PAB caused RV hypertrophy, increased myocardial contractility, and decreased RV-EF and cardiac output. The time-to-peak pulmonary artery flow correlated with RV pressures.
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