| Pulsatility index variations using two different transit-time flowmeters in coronary artery bypass surgery. | |
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MedLine Citation:
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PMID: 20031439 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: Transit-time flow measurement is widely accepted as an intra-operative assessment in coronary artery bypass grafting (CABG). However, the two most commonly applied flowmeters, manufactured by MediStim ASA and Transonic Inc., have different default filter settings of 20 and 10 Hz, respectively. This may cause different flow measurements, which will influence the reported results. The aim was to compare pulsatility index (PI) values recorded by the MediStim and Transonic flowmeters in two different clinical settings: (1) analysis of the flow patterns recorded simultaneously by both flowmeters in the same CABGs; and (2) evaluation of flow patterns under different levels of filter settings in the same grafts. METHODS: Graft flow and PI were measured using the two different flowmeters simultaneously in 19 bypass grafts. Finally, eight grafts were assessed under different digital filter settings at 5, 10, 20, 30, 50 and 100 Hz. RESULTS: The Transonic flowmeter provided substantially lower PI as compared with the MediStim flowmeter. By increasing the filter setting in the flowmeter, PI increased considerably. CONCLUSIONS: The Transonic flowmeter displayed a lower PI than the MediStim, due to a lower filter setting. In the Transonic,flow signals are filtered at a lower level, rendering a 'smoother' pattern of flow curves. Because different filter settings determine different PIs, caution must be taken when flow values and flowmeters are compared. The type of flowmeter should be indicated whenever graft flow measurements and derived indexes are provided [corrected]. |
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Authors:
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Håvard B Nordgaard; Nicola Vitale; Rafael Astudillo; Attilio Renzulli; Pål Romundstad; Rune Haaverstad |
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Publication Detail:
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Type: Comparative Study; Journal Article; Review Date: 2009-12-23 |
Journal Detail:
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Title: European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery Volume: 37 ISSN: 1873-734X ISO Abbreviation: Eur J Cardiothorac Surg Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-05-03 Completed Date: 2011-02-23 Revised Date: 2011-03-17 |
Medline Journal Info:
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Nlm Unique ID: 8804069 Medline TA: Eur J Cardiothorac Surg Country: Germany |
Other Details:
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Languages: eng Pagination: 1063-7 Citation Subset: IM |
Copyright Information:
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Copyright 2009 European Association for Cardio-Thoracic Surgery. All rights reserved. |
Affiliation:
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Department of Circulation and Medical Imaging, The Norwegian University of Science and Technology, N-7489 Trondheim, Norway. haavardnordgaard@gmail.com |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Cardiopulmonary Bypass Coronary Artery Bypass / methods* Equipment Design Flowmeters* Humans Monitoring, Intraoperative / instrumentation* Pulsatile Flow Saphenous Vein / transplantation Signal Processing, Computer-Assisted Vascular Patency |
| Comments/Corrections | |
Comment In:
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Eur J Cardiothorac Surg. 2011 Mar;39(3):431; author reply 431-2
[PMID:
20702102
]
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Erratum In:
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Eur J Cardiothorac Surg. 2010 Oct;38(4):512 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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