Abstract
It was recently shown that invasively determined right ventricular (RV) stiffness was more closely related to the prognosis of patients with pulmonary hypertension than RV systolic function. So far, a completely noninvasive method to access RV stiffness has not been reported. We aimed to clarify the clinical usefulness of our new echocardiographic index of RV operating stiffness using atrial-systolic descent of the pulmonary artery-RV pressure gradient derived from pulmonary regurgitant velocity (PRPGDAC) and tricuspid annular plane movement during atrial contraction (TAPMAC). We studied 81 consecutive patients with various cardiac diseases who underwent echocardiography and cardiac catheterization. We measured PRPGDAC and TAPMAC using continuous-wave Doppler and M-mode echocardiography, respectively, and calculated PRPGDAC/TAPMAC. RV end-diastolic pressure (RVEDP) and RV pressure increase during atrial contraction (ΔRVPAC) were invasively measured, and RV volume change during atrial contraction (ΔVAC) was calculated from echocardiographic late-diastolic transtricuspid flow time-velocity integral and tricuspid annular area; thus ΔRVPAC/ΔVAC was used as the standard index for RV operating stiffness. PRPGDAC/TAPMAC well correlated with ΔRVPAC/ΔVAC (r = 0.84, p < 0.001) and RVEDP (r = 0.80, p < 0.001), and the area under the receiver operating characteristic curve to discriminate RVEDP > 12 mmHg was 0.94. Multivariate regression analysis revealed that PRPGDAC/TAPMAC was the single independent determinant of ΔRVPAC/ΔVAC (β = 0.86, p < 0.001). PRPGDAC/TAPMAC is useful to estimate RV operating stiffness and a good practical indicator of RVEDP.
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Abbreviations
- CMR:
-
Cardiac magnetic resonance
- ΔP:
-
Pressure change
- ΔRVPAC :
-
RV pressure increase during the atrial contraction
- ΔV:
-
Volume change
- ΔVAC :
-
Right ventricular volume change during atrial contraction
- EDPVR:
-
End-diastolic pressure–volume relation
- LV:
-
Left ventricular
- PA:
-
Pulmonary artery
- PAH:
-
Pulmonary arterial hypertension
- PR:
-
Pulmonary regurgitant
- PRPGDAC :
-
The descent of pulmonary regurgitant pressure gradient during atrial contraction
- RV:
-
Right ventricular
- RVEDP:
-
Right ventricular end-diastolic pressure
- TAPMAC :
-
Tricuspid annular plane movement during atrial contraction
- TAPSE:
-
Tricuspid annular plane systolic excursion
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Murayama, M., Okada, K., Kaga, S. et al. Simple and noninvasive method to estimate right ventricular operating stiffness based on echocardiographic pulmonary regurgitant velocity and tricuspid annular plane movement measurements during atrial contraction. Int J Cardiovasc Imaging 35, 1871–1880 (2019). https://doi.org/10.1007/s10554-019-01637-2
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DOI: https://doi.org/10.1007/s10554-019-01637-2