title: The relationship of conjunctival and arterial blood gas oxygen measurements.
abstract: Conjunctival oxymetry (CjO2) measures peripheral tissue oxygen at the conjunctival level. CjO2 changes can indicate pulmonary or circulatory conditions leading to shock. Literature review does not define 'normal' CjO2/ABG PaO2 ratios. We designed a study to measure these ratios. Twenty-two healthy patients undergoing cardiac catheterization had simultaneous PcjO2 and PaO2 measurements completed. The range of conjunctival oxygen measurements was from 34 to 68 mmHg with a mean of 50.5 mmHg. The PaO2 readings ranged from 65 to 93 mmHg with a mean of 77.1 mmHg. The average PcjO2/PaO2 ratio was 0.656 with a range of 0.47-0.93. Thus the PcjO2 is on average 66% of the arterial blood gas PaO2. This ratio of 0.66 can serve as a base for further clinical studies in which PcjO2 is looked at in patients with pulmonary or circulatory illnesses or injuries.
authors.affiliation: Department of Emergency Medicine, Albert Einstein Medical Center, York, PA.
authors.forename: S
authors.initials: S
authors.lastname: Podolsky
authors.forename: J
authors.initials: J
authors.lastname: Wertheimer
authors.forename: S
authors.initials: S
authors.lastname: Harding
mesh_terms: D000328:Adult; D001785:Blood Gas Monitoring, Transcutaneous; D003228:Conjunctiva / Q000378:metabolism; D005260:Female; D006801:Humans; D008297:Male; D010100:Oxygen / Q000032:analysis*
chemical_list: D010100:Oxygen