Right ventricular pressure-volume loop shape and systolic pressure change in pulmonary hypertension

Manuel J. Richter, Steven Hsu, Athiththan Yogeswaran, Faeq Husain-Syed, István Vadász, Hossein A. Ghofrani, Robert Naeije, Sebastian Harth, Friedrich Grimminger, Werner Seeger, Henning Gall, Ryan Tedford, Khodr Tello

Research output: Contribution to journalArticlepeer-review

Abstract

Right ventricular (RV) function determines outcome in pulmonary arterial hypertension (PAH). RV pressure-volume loops, the gold standard for measuring RV function, are difficult to analyze. Our aim was to investigate whether simple assessments of RV pressure-volume loop morphology and RV systolic pressure differential reflect PAH severity and RV function. We analyzed multibeat RV pressure-volume loops (obtained by conductance catheterization with preload reduction) in 77 patients with PAH and 15 patients without pulmonary hypertension in two centers. Patients were categorized according to their pressure-volume loop shape (triangular, quadratic, trapezoid, or notched). RV systolic pressure differential was defined as end-systolic minus beginning-systolic pressure (ESP - BSP), augmentation index as ESP - BSP/pulse pressure, pulmonary arterial capacitance (PAC) as stroke volume/pulse pressure, and RV-arterial coupling as end-systolic/arterial elastance (Ees/Ea). Trapezoid and notched pressure-volume loops were associated with the highest afterload (Ea), augmentation index, pulmonary vascular resistance (PVR), mean pulmonary arterial pressure, stroke work, B-type natriuretic peptide, and the lowest Ees/Ea and PAC. Multivariate linear regression identified Ea, PVR, and stroke work as the main determinants of ESP - BSP. ESP - BSP also significantly correlated with multibeat Ees/Ea (Spearman’s r: -0.518, P < 0.001). A separate retrospective analysis of 113 patients with PAH showed that ESP - BSP obtained by routine right heart catheterization significantly correlated with a noninvasive surrogate of RV-arterial coupling (tricuspid annular plane systolic excursion/pulmonary arterial systolic pressure ratio; r: -0.376, P < 0.001). In conclusion, pressure-volume loop shape and RV systolic pressure differential predominately depend on afterload and PAH severity and reflect RV-arterial coupling in PAH.

Original languageEnglish (US)
Pages (from-to)L715-L725
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume320
Issue number5
DOIs
StatePublished - May 2021

Keywords

  • Pressure-volume relationship
  • Pulmonary arterial hypertension
  • Right ventricle
  • Right ventricle-pulmonary arterial
  • Systolic function coupling

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Physiology (medical)
  • Cell Biology

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