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Non-invasive blood haemoglobin and plethysmographic variability index during brachial plexus block
Linköping University, Department of Medical and Health Sciences. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Anaesthetics, Operations and Specialty Surgery Center, Department of Anaesthesiology and Intensive Care in Linköping.
Linköping University, Department of Medical and Health Sciences. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Anaesthetics, Operations and Specialty Surgery Center, Department of Anaesthesiology and Intensive Care in Linköping.
Linköping University, Department of Medical and Health Sciences, Division of Drug Research. Region Östergötland, Anaesthetics, Operations and Specialty Surgery Center, Department of Anaesthesiology and Intensive Care in Linköping. Linköping University, Faculty of Medicine and Health Sciences. Research Unit, Södertälje Hospital, Södertälje, Sweden.
2015 (English)In: British Journal of Anaesthesia, ISSN 0007-0912, E-ISSN 1471-6771, Vol. 114, no 5, 812-817 p.Article in journal (Refereed) Published
Abstract [en]

Background Plethysmographic measurement of haemoglobin concentration (SpHb  ), pleth variability index (PVI), and perfusion index (PI) with the Radical-7 apparatus is growing in popularity. Previous studies have indicated that SpHb  has poor precision, particularly when PI is low. We wanted to study the effects of a sympathetic block on these measurements.

Methods Twenty patients underwent hand surgery under brachial plexus block with one Radical-7 applied to each arm. Measurements were taken up to 20 min after the block had been initiated. Venous blood samples were also drawn from the non-blocked arm.

Results During the last 10 min of the study, SpHb  had increased by 8.6%. The PVI decreased by 54%, and PI increased by 188% in the blocked arm (median values). All these changes were statistically significant. In the non-blocked arm, these parameters did not change significantly.

Conclusions Brachial plexus block significantly altered SpHb  , PVI, and PI, which indicates that regional nervous control of the arm greatly affects plethysmographic measurements obtained by the Radical-7. After the brachial plexus block, SpHb  increased and PVI decreased.

Place, publisher, year, edition, pages
Oxford University Press (OUP): Policy B - Oxford Open Option B , 2015. Vol. 114, no 5, 812-817 p.
Keyword [en]
haemoglobinometry; nerve blockade; perfusion; photoplethysmography; vasodilation
National Category
Anesthesiology and Intensive Care
Identifiers
URN: urn:nbn:se:liu:diva-118861DOI: 10.1093/bja/aeu484ISI: 000354153500015PubMedID: 25603961OAI: oai:DiVA.org:liu-118861DiVA: diva2:817986
Available from: 2015-06-08 Created: 2015-06-04 Last updated: 2015-06-23

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Bergek, ChristianZdolsek, Joachim H.Hahn, Robert
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Department of Medical and Health SciencesFaculty of Health SciencesDepartment of Anaesthesiology and Intensive Care in LinköpingDivision of Drug ResearchDepartment of Anaesthesiology and Intensive Care in LinköpingFaculty of Medicine and Health Sciences
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British Journal of Anaesthesia
Anesthesiology and Intensive Care

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