| Exercise-related changes in aortic flow measured with spiral echo-planar MR velocity mapping. | |
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MedLine Citation:
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PMID: 7766976 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Spiral echo-planar magnetic resonance (MR) velocity mapping was used to measure exercise-related changes in flow in the descending thoracic aorta in 10 healthy volunteers. Flow was measured at rest and immediately after dynamic exercise, with a 0.5-T imager with a surface receiving coil and electrocardiographic triggering. Supine exercise was performed with a home-built pedaling apparatus. Spiral velocity mapping was performed in a transverse plane through the descending thoracic aorta with the subject at rest. The subject was then asked to perform maximum exercise, stop, and hold his breath during a four-heartbeat acquisition time. Eight cine frames with a temporal resolution of 50 msec were acquired through systole. Each image was acquired in 40 msec during spiral acquisition of k-space data, starting at the center, 6 msec after the excitation pulse. Reproducibility of the technique was established by repeating the flow measurement in four consecutive heartbeats. At rest, the heart rate (mean +/- standard deviation), mean aortic flow, peak aortic flow, and time to peak flow were 68 beats per minute +/- 6, 41 milliliters per beat +/- 8, 107 mL/sec +/- 20, and 175 msec +/- 25, respectively. After exercise, the heart rate and mean and peak aortic flow were significantly increased (P < .001), measuring 101 beats per minute +/- 12, 57 milliliters per beat +/- 11, and 158 mL/sec +/- 29, respectively, while the time to peak flow (115 msec +/- 32) was significantly reduced (P < .001). The four sets of values obtained for the first four consecutive heartbeats measured at rest were similar, as were those obtained for the first four heartbeats after exercise. |
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Authors:
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R H Mohiaddin; P D Gatehouse; D N Firmin |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of magnetic resonance imaging : JMRI Volume: 5 ISSN: 1053-1807 ISO Abbreviation: J Magn Reson Imaging Publication Date: 1995 Mar-Apr |
Date Detail:
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Created Date: 1995-07-05 Completed Date: 1995-07-05 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 9105850 Medline TA: J Magn Reson Imaging Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 159-63 Citation Subset: IM |
Affiliation:
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Magnetic Resonance Unit, Royal Brompton Hospital, London, England. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aorta, Thoracic / physiology* Blood Flow Velocity* Echo-Planar Imaging* Electrocardiography Exercise Test* Female Heart Rate Humans Male Reproducibility of Results |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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