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Retinal oximetry with a prototype handheld oximeter during hyperoxia

Retinal oximetry with a prototype handheld oximeter during hyperoxia

Title: Retinal oximetry with a prototype handheld oximeter during hyperoxia
Author: Vehmeijer, Wouter B.
Jonkman, Kelly
Harðarson, Sveinn Hákon
Aarts, Leon
Stefánsson, Einar
Dahan, Albert
Schalij-Delfos, Nicoline E.
Date: 2021-03-01
Language: English
Scope: e1390-e1395
University/Institute: Landspitali - The National University Hospital of Iceland
Department: Faculty of Medicine
Other departments
Series: Acta Ophthalmologica; 99(8)
ISSN: 1755-375X
DOI: https://doi.org/10.1111/aos.14817
Subject: Sjónhimna; Súrefni; Mælingar; Lófatölvur; fundus imaging; handheld oximeter; hyperoxia; retinal oximetry; Ophthalmology
URI: https://hdl.handle.net/20.500.11815/3216

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Vehmeijer , W B , Jonkman , K , Harðarson , S H , Aarts , L , Stefánsson , E , Dahan , A & Schalij-Delfos , N E 2021 , ' Retinal oximetry with a prototype handheld oximeter during hyperoxia ' , Acta Ophthalmologica , vol. 99 , no. 8 , pp. e1390-e1395 . https://doi.org/10.1111/aos.14817


Purpose: Retinal oximetry measures oxygen saturation in retinal vessels. With the introduction of a mobile handheld prototype oximeter, this technique will become available for a broader patient population including bedridden patients and newborn babies. The objective is to determine the sensitivity of this handheld oximeter in room air and during isocapnic hyperoxia. A comparison is made between the handheld oximeter and the Oxymap T1. Methods: Thirteen young healthy subjects with a mean age of 25 ± 2 years were recruited at the Leiden University Medical Center. Retinal oximetry images were acquired during normoxia and during isocapnic hyperoxia for both the prototype oximeter and the OxymapT1. Isocapnic hyperoxia was induced with the dynamic end-tidal forcing technique. For both oximeters, the oxygen saturation and vessel width were measured with Oxymap Analyzer software. The hyperoxic state was verified with blood gas analysis. Results: The mean oxygen saturation measured with the handheld oximeter in arterioles was 91.3% ± 3.9% during normoxia and 94.6% ± 3.9% during hyperoxia (p = 0.001). Oxygen saturation in venules was 56.3% ± 9.8% during normoxia and 82.2 ± 7.4% during hyperoxia (p < 0.001). For the Oxymap T1, the mean oxygen saturation for arterioles was 94.0% ± 2.6% during normoxia and 95.4%±3.2% during hyperoxia (p = 0.004). For the venules, the oxygen saturation was during normoxia 58.9%±3.2% and 84.3 ± 4.0% during hyperoxia (p < 0.001). Conclusion: The handheld retinal oximeter is sensitive to the changes in inhaled oxygen concentration. A small increase in oxygen saturation was measured in the arterioles and a larger increase in the venules. The handheld oximeter gives similar values as the ‘gold standard’ Oxymap T1 oximeter.


Publisher Copyright: © 2021 The Authors. Acta Ophthalmologica published by John Wiley & Sons Ltd on behalf of Acta Ophthalmologica Scandinavica Foundation.

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