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• W2155496657 abstract "Rationale: Severe increase in right ventricular pressure can compromise left ventricular (LV) function because of impaired interventricular interaction and aggravate the symptoms.Objectives: To elucidate how nonsevere idiopathic pulmonary arterial hypertension (IPAH) influences LV function because of impaired interventricular interaction.Methods: Invasive pressure–volume (PV) loop analysis obtained by conductance catheterization was performed at rest and during atrial pacing in patients with mild IPAH (n = 10) compared with patients with isolated LV diastolic dysfunction (DD) (n = 10) and control subjects without heart failure symptoms (n = 9).Measurements and Main Results: Patients with nonsevere IPAH (pulmonary artery pressure mean 29 ± 5 mm Hg) and patients with DD showed preserved systolic (ejection fraction 63 ± 12% and 62 ± 9%) and impaired LV diastolic function at rest (LV stiffness 0.027 ± 0.012 ml−1 and 0.029 ± 0.014 ml−1). During pacing at 120 per minute patients with IPAH and DD decreased their stroke volume (−25% and −30%; P < 0.05) and failed to increase cardiac output significantly. Opposite to patients with DD and control subjects, temporary preload reduction during inferior vena cava occlusion initially induced an expansion of LV end-diastolic volume in IPAH (+7%; P < 0.05), whereas end-diastolic pressure continuously dropped. This resulted in an initial downward shift to the right of the PV loop indicating better LV filling, which was associated with a temporary improvement of cardiac output (+11%; P < 0.05) in the patients with IPAH, but not in patients with DD and control subjects.Conclusions: Mild idiopathic pulmonary arterial pressure impairs LV diastolic compliance even in the absence of the intrinsic LV disease and contributes to the reduced cardiac performance at stress." @default.
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• W2155496657 date "2012-07-15" @default.
• W2155496657 modified "2023-10-17" @default.
• W2155496657 title "Left Ventricular Dysfunction Induced by Nonsevere Idiopathic Pulmonary Arterial Hypertension" @default.
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• W2155496657 doi "https://doi.org/10.1164/rccm.201110-1860oc" @default.
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