Different responses of ear and finger pulse oximeter wave form to cold pressor test.

Abstract:

:The cold pressor test is often used to assess vasoconstrictive responses because it simulates the vasoconstrictive challenges commonly encountered in the clinical setting. With IRB approval, 12 healthy volunteers, aged 25--50 yr, underwent baseline plethysmographic monitoring on the finger and ear. The contralateral hand was immersed in ice water for 30 s to elicit a systemic vasoconstrictive response while the recordings were continued. The changes in plethysmographic amplitude for the first 30 s of ice water immersion (period of maximum response) of the finger and ear were compared. The data indicate a significant disparity between the finger and the ear signals in response to the cold stimulus. The average finger plethysmographic amplitude measurement decreased by 48% +/- 19%. In contrast, no significant change was seen in the ear plethysmographic amplitude measurement, which decreased by 2% +/- 10%. We conclude that the ear is relatively immune to the vasoconstrictive effects. These findings suggest that the comparison of the ear and finger pulse oximeter wave forms might be used as a real-time monitor of sympathetic tone and that the ear plethysmography may be a suitable monitor of the systemic circulation.

journal_name

Anesth Analg

journal_title

Anesthesia and analgesia

authors

Awad AA,Ghobashy MA,Ouda W,Stout RG,Silverman DG,Shelley KH

doi

10.1097/00000539-200106000-00026

subject

Has Abstract

pub_date

2001-06-01 00:00:00

pages

1483-6

issue

6

eissn

0003-2999

issn

1526-7598

journal_volume

92

pub_type

临床试验,杂志文章
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    pub_type: 杂志文章,meta分析,评审

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    pub_type: 临床试验,杂志文章,随机对照试验

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