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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Abbreviations
- RV:
-
Right ventricle
- PA:
-
Pulmonary artery
- PAB:
-
Pulmonary artery banding
- CMR:
-
Cardiac magnetic resonance
- PC-CMR:
-
Phase-contrast cardiac magnetic resonance
- EF:
-
Ejection fraction
- ESV:
-
End-systolic volume
- EDV:
-
End-diastolic volume
- SV:
-
Stroke volume
- RV-Pmax :
-
RV maximal systolic pressure
- RV-EDP:
-
Right ventricular end-diastolic pressure
- RV-ESP:
-
Right ventricular end-systolic pressure
- RV-dP/dtmax :
-
Right ventricular maximum rate of pressure rise
- RV-dP/dtmin :
-
Right ventricular minimum rate of pressure rise
- RV-CO:
-
Right ventricular cardiac output
- RV-EDPVR:
-
RV end-diastolic pressure-volume relationship
- RV-ESPVR:
-
RV end-systolic pressure-volume relationship
- RV-PRSW:
-
RV preload-recruitable stroke work
- SSFP:
-
Steady-state free precession
- ECG:
-
Electrocardiogram
- TVA:
-
Tricuspid valve annulus
- TVA-MD:
-
Tricuspid valve annulus maximal longitudinal displacement
- TVA-Vmax :
-
Tricuspid valve annulus maximal velocity
- TVA-VED :
-
Tricuspid valve annulus maximal velocity at end diastole
- TTP:
-
Time-to-peak
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This study was approved by the local Animal Care Committee. Animals received humane care in compliance with the Principles of Laboratory Animal Care formulated by the National Society for Medical Research and the Guide for the Care and Use of Laboratory Animals.
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Gufler, H., Niefeldt, S., Boltze, J. et al. Right Ventricular Function After Pulmonary Artery Banding: Adaptive Processes Assessed by CMR and Conductance Catheter Measurements in Sheep. J. of Cardiovasc. Trans. Res. 12, 459–466 (2019). https://doi.org/10.1007/s12265-019-09881-6
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DOI: https://doi.org/10.1007/s12265-019-09881-6