Non-invasive blood haemoglobin and plethysmographic variability index during brachial plexus block†

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Abstract

Background

Plethysmographic measurement of haemoglobin concentration (

Background

JOURNAL/bjant/04.02/00002264-201505000-00015/math_15MM1/v/2018-05-31T055738Z/r/image-png

Background

), pleth variability index (PVI), and perfusion index (PI) with the Radical-7 apparatus is growing in popularity. Previous studies have indicated that

Background

JOURNAL/bjant/04.02/00002264-201505000-00015/math_15MM2/v/2018-05-31T055738Z/r/image-png

Background

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,

Results

JOURNAL/bjant/04.02/00002264-201505000-00015/math_15MM3/v/2018-05-31T055738Z/r/image-png

Results

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

Conclusions

JOURNAL/bjant/04.02/00002264-201505000-00015/math_15MM4/v/2018-05-31T055738Z/r/image-png

Conclusions

, 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,

Conclusions

JOURNAL/bjant/04.02/00002264-201505000-00015/math_15MM5/v/2018-05-31T055738Z/r/image-png

Conclusions

increased and PVI decreased.

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