| Heart and brain circulation and CO2 in healthy men. | |
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MedLine Citation:
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PMID: 18284656 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIM: To compare blood flow response to arterial carbon dioxide tension change in the heart and brain of normal elderly men. METHODS: Thirteen healthy elderly male volunteers were studied. Hypercapnea was induced by carbon dioxide inhalation and hypocapnea was induced by hyperventilation. Myocardial blood flow [mL min(-1) x (100 g of perfusable tissue)(-1)] and cerebral blood flow [mL min(-1) x (100 g of perfusable tissue)(-1)] were measured simultaneously at rest, under carbon dioxide gas inhalation and hyperventilation using the combination of two positron emission tomography scanners. RESULTS: Arterial carbon dioxide tension increased significantly during carbon dioxide inhalation (43.1 +/- 2.7 mmHg, P < 0.05) and decreased significantly during hyperventilation (29.2 +/- 3.4 mmHg, P < 0.01) from baseline (40.2 +/- 2.4 mmHg). Myocardial blood flow increased significantly during hypercapnea (88.7 +/- 22.4, P < 0.01) from baseline (78.2 +/- 12.6), as did the cerebral blood flow (baseline: 39.8 +/- 5.3 vs. hypercapnea: 48.4 +/- 10.4, P < 0.05). During hypocapnea cerebral blood flow decreased significantly (27.0 +/- 6.3, P < 0.01) from baseline as did the myocardial blood flow (55.1 +/- 14.6, P < 0.01). However, normalized myocardial blood flow by cardiac workload [100 mL mmHg(-1) x (heart beat)(-1) x (gram of perfusable tissue)(-1)] was not changed from baseline (93.4 +/- 16.6) during hypercapnea (90.5 +/- 14.3) but decreased significantly from baseline during hypocapnea (64.5 +/- 18.3, P < 0.01). CONCLUSION: In normal elderly men, hypocapnea produces similar vasoconstriction both in the heart and brain. Mild hypercapnea increased cerebral blood flow but did not have an additional effect to dilate coronary arteries beyond the expected range in response to an increase in cardiac workload. |
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Authors:
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I Yokoyama; Y Inoue; T Kinoshita; H Itoh; I Kanno; H Iida |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-02-12 |
Journal Detail:
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Title: Acta physiologica (Oxford, England) Volume: 193 ISSN: 1748-1716 ISO Abbreviation: Acta Physiol (Oxf) Publication Date: 2008 Jul |
Date Detail:
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Created Date: 2008-06-05 Completed Date: 2008-12-04 Revised Date: 2009-02-03 |
Medline Journal Info:
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Nlm Unique ID: 101262545 Medline TA: Acta Physiol (Oxf) Country: England |
Other Details:
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Languages: eng Pagination: 303-8 Citation Subset: IM |
Affiliation:
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Department of Cardiovascular Medicine, Sanno Hospital, International University of Health and Welfare, Tokyo, Japan.yokochan-tky@umin.ac.jp |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aged Brain / radionuclide imaging Carbon Dioxide / blood, physiology* Cerebrovascular Circulation / physiology* Coronary Circulation / physiology* Heart / radionuclide imaging Hemodynamics Humans Hydrogen-Ion Concentration Hypercapnia / blood, physiopathology Hypocapnia / blood, physiopathology Male Middle Aged Positron-Emission Tomography / methods Vasoconstriction |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide |
| Comments/Corrections | |
Comment In:
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Acta Physiol (Oxf). 2008 Jul;193(3):203
[PMID:
18532943
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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