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Am J Respir Crit Care Med. 2012 Jul 15;186(2):181-9. doi: 10.1164/rccm.201110-1860OC. Epub 2012 May 3.

Left ventricular dysfunction induced by nonsevere idiopathic pulmonary arterial hypertension: a pressure-volume relationship study.

Author information

1
Department of Cardiology and Pneumology, Charité-Universitätsmedizin Berlin, CBF, Hindenburgdamm 30, 12200 Berlin, Germany.

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.

PMID:
22561959
DOI:
10.1164/rccm.201110-1860OC
[Indexed for MEDLINE]

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