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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

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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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Correspondence to Sanae Kaga.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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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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