| Transjugular intrahepatic portosystemic shunts (TIPS): effects of respiratory state and patient position on the measurement of Doppler velocities. | |
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MedLine Citation:
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PMID: 10882265 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: The purpose of this prospective study was to examine the effects of patient position and respiratory state on the measurements of Doppler velocities in transjugular intrahepatic portosystemic shunts. SUBJECTS AND METHODS: Thirty-eight transjugular intrahepatic portosystemic shunts in 34 consecutive patients were studied using Doppler sonography. Peak velocities were measured in the mid shunt with the patient in three positions (supine, sitting upright, and left lateral decubitus) and two respiratory states (deep inspiration and quiet respiration). A mixed linear regression model was used to assess statistically significant differences among the six velocity measurements. RESULTS: Peak velocities in the mid stent averaged 22 cm/sec greater in quiet respiration than in deep inspiration, which was a significant difference (p < 0.00001). Differences in velocities in the three patient positions were not significant (p = 0.53). Using 90-190 cm/sec as the normal range, the peak velocity shifted from normal to abnormal levels by changing respiratory state in 17 (45%) of 38 studies. Using 60 cm/sec as the lower normal limit, the peak velocity fell below the normal range with inspiration in 10 (26%) of 38 studies. In 12 (32%) of 38 studies, a decline in peak velocity exceeding 50 cm/sec could be induced by inspiration. CONCLUSION: Peak systolic velocity in transjugular intrahepatic portosystemic shunts is substantially altered by the respiratory state of the patient at the time of the measurement, but not by the patient position. Respiratory state must be taken into account in the interpretation of peak velocity for shunt stenosis. |
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Authors:
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M A Kliewer; B S Hertzberg; J P Heneghan; P V Suhocki; D H Sheafor; P A Gannon; E K Paulson |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: AJR. American journal of roentgenology Volume: 175 ISSN: 0361-803X ISO Abbreviation: AJR Am J Roentgenol Publication Date: 2000 Jul |
Date Detail:
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Created Date: 2000-08-01 Completed Date: 2000-08-01 Revised Date: 2008-02-15 |
Medline Journal Info:
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Nlm Unique ID: 7708173 Medline TA: AJR Am J Roentgenol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 149-52 Citation Subset: AIM; IM |
Affiliation:
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Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Blood Flow Velocity Female Hepatic Veins / physiology, ultrasonography* Humans Male Middle Aged Portal Vein / physiology, ultrasonography* Portasystemic Shunt, Transjugular Intrahepatic* Posture / physiology* Prospective Studies Respiration* Ultrasonography, Doppler* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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