2024
Stiffening of the human proximal pulmonary artery with increasing age
Manning E, Mishall P, Ramachandra A, Hassab A, Lamy J, Peters D, Murphy T, Heerdt P, Singh I, Downie S, Choudhary G, Tellides G, Humphrey J. Stiffening of the human proximal pulmonary artery with increasing age. Physiological Reports 2024, 12: e16090. PMID: 38884325, PMCID: PMC11181131, DOI: 10.14814/phy2.16090.Peer-Reviewed Original ResearchConceptsProximal pulmonary arteriesPulmonary arteryAge-related stiffeningRight ventricular ejection fractionVentricular ejection fractionMean wall thicknessEjection fractionNo significant differenceSystemic circulationLuminal caliberDiffusing capacityArterial stiffeningIncreasing ageSignificant differenceDistensionArteryWall thicknessAdverse effectsWall strainVessel diameterCyclic biaxial strainOrgan donorsAgeMicrostructural remodeling
2022
Pressure‐based estimation of right ventricular ejection fraction
Heerdt PM, Singh I, Elassal A, Kheyfets V, Richter MJ, Tello K. Pressure‐based estimation of right ventricular ejection fraction. ESC Heart Failure 2022, 9: 1436-1443. PMID: 35150211, PMCID: PMC8934966, DOI: 10.1002/ehf2.13839.Peer-Reviewed Original ResearchConceptsRight ventricular ejection fractionCardiac magnetic resonance imagingRight heart catheterizationPulmonary arterial hypertensionMagnetic resonance imagingRV pressure waveformsVentricular ejection fractionRV responseEjection fractionMale PAH patientsCardiac MRI measurementsReceiver operator characteristic curvePressure waveformROC curve analysisClinical reference standardOperator characteristic curveSignificant reductionMeasurements of RVEFPAH patientsArterial hypertensionHeart catheterizationSecondary outcomesStudy cohortLimits of agreementBland-Altman analysis
2021
Pressure-based estimation of right ventricular ejection fraction: Validation as a clinically relevant target for drug development in a rodent model of pulmonary hypertension
Elassal A, Steppan J, Charania S, Santhanam L, Singh I, Heerdt PM. Pressure-based estimation of right ventricular ejection fraction: Validation as a clinically relevant target for drug development in a rodent model of pulmonary hypertension. Journal Of Pharmacological And Toxicological Methods 2021, 112: 107102. PMID: 34245885, PMCID: PMC8616781, DOI: 10.1016/j.vascn.2021.107102.Peer-Reviewed Original ResearchConceptsRight ventricular ejection fractionPulmonary arterial hypertensionRV pressure waveformsVentricular ejection fractionEjection fractionDepressed right ventricular ejection fractionClear prognostic significanceRight ventricular pressurePressure waveformVolume measurementsPAH therapyPulmonary hypertensionArterial hypertensionPrognostic significanceBland-Altman analysisVentricular pressureRat modelRV volumesRodent modelsDrug effectsHypertensionDrug developmentBeat intervalsRatsRelevant targets
2020
A Pressure-Based Method for Estimation of Right Ventricular Ejection Fraction in a Rodent Model of Pulmonary Arterial Hypertension
Heerdt P, Charania S, Elassal A, Singh I, Steppan J. A Pressure-Based Method for Estimation of Right Ventricular Ejection Fraction in a Rodent Model of Pulmonary Arterial Hypertension. 2020, a2086-a2086. DOI: 10.1164/ajrccm-conference.2020.201.1_meetingabstracts.a2086.Peer-Reviewed Original ResearchRight ventricular ejection fractionPulmonary arterial hypertensionVentricular ejection fractionArterial hypertensionEjection fractionRodent modelsHypertension
2019
A pressure-based single beat method for estimation of right ventricular ejection fraction: proof of concept
Heerdt PM, Kheyfets V, Charania S, Elassal A, Singh I. A pressure-based single beat method for estimation of right ventricular ejection fraction: proof of concept. European Respiratory Journal 2019, 55: 1901635. PMID: 31771999, PMCID: PMC7885179, DOI: 10.1183/13993003.01635-2019.Peer-Reviewed Original ResearchConceptsSingle-beat methodEjection fractionEnd-systolic ventricular elastanceRight ventricular ejection fractionRV pressure waveformsRight ventricular contractilityVentricular ejection fractionRV ejection fractionEes/EaVentricular contractilityCardiovascular decompensationVentricular elastancePressure waveform