| Supine-exercise-induced oxygen supply to the right myocardium is attenuated in patients with severe idiopathic pulmonary arterial hypertension. | |
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MedLine Citation:
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PMID: 21880654 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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BackgroundImpaired right ventricular (RV) myocardial blood flow (MBF) has been associated with RV dysfunction and fatal RV failure in idiopathic pulmonary hypertension during stress. MBF and O(2) extraction from myocardial capillaries (O(2) extraction fraction (OEF)) influence myocardial O(2) supply.ObjectiveTo determine how the baseline RV OEF affects the amount of MBF increase induced by supine exercise, the authors hypothesise that higher baseline OEF (H-OEF) results in limited O(2) extraction during exercise and that MBF must therefore be increased to obtain sufficient O(2).MethodsIn 18 patients with idiopathic pulmonary hypertension, baseline OEF, resting MBF and exercise-induced MBF at 40% of maximal cardiopulmonary exercise testing load were measured using positron emission tomography and [(15)O]O(2), [(15)O]H(2)O and [(15)O]CO.ResultsFor the whole population, exercise increased RV MBF from 0.68±0.16 to 1.13±0.38 ml/min/g (p<0.0001). The MBF exercise-to-rest ratio (reserve) was 1.7±0.7. The median baseline OEF was 0.73 at which the patient population was split into H-OEF and lower baseline OEF (L-OEF). Baseline MBF values (0.61±0.11 and 0.74±0.17 ml/min/g, respectively) were similar, and exercise induced a significant MBF increase in both groups (p=0.0001). However, exercise-induced increase in MBF was significantly less in the H-OEF group than in the L-OEF group (0.97±0.30 and 1.30±0.39 ml/min/g, respectively, p<0.05). Moreover, H-OEF patients had lower baseline stroke volume and cardiac output than the L-OEF group (52±19 ml and 4.0±1.1 l/min vs 78±18 ml and 5.5±0.9 l/min, respectively, both p<0.05).ConclusionsH-OEF patients were hemodynamically poorer and showed a lower exercise-induced MBF increase compared to L-OEF patients, suggesting exercise-induced O(2) supply limitation. |
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Authors:
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Yeun Ying Wong; Pieter G Raijmakers; Paul Knaapen; Mark Lubberink; Gerrina Ruiter; J Tim Marcus; Anco Boonstra; Adriaan A Lammertsma; Nico Westerhof; Willem J van der Laarse; Anton Vonk-Noordegraaf |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-8-31 |
Journal Detail:
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Title: Heart (British Cardiac Society) Volume: - ISSN: 1468-201X ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
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Created Date: 2011-9-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9602087 Medline TA: Heart Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Institute of Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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