Estimation of arterial oxygen tension in adult subjects using a transcutaneous electrode.

AUTOR(ES)

Hutchison, D C

RESUMO

Transcutaneous oxygen tension (tcPO2) measured with a heated electrode was compared with arterial oxygen tension (PaO2) in three groups of adult patients-group A: 20 patients with chronic respiratory disease; group B: eight hypothermic patents studied immediately after cardiopulmonary bypass surgery; and group C: 14 patients in an intensive care unit who had in all 35 comparisons of tcPO2 and PaO2. For group A, the relationship of the two methods is given by the regression equation (in mmHg): tcPO2 = 0.88 PaO2 + 5.0 (standard error = 5.2: r = 0.93: p less than 0.001) and for group C tcPO2 = 0.69 PaO2 + 14.9 (standard error =12.0, r = 0.90: p less than 0.001). A method of in vivo calibration using a single arterial blood sample improved the reliability of the method in group C. In the group B patients there was no correlation between tcPO2 and PaO2 even when supplementary heating was applied to the skin. Continuous monitoring can reveal large fluctuations in arterial PO2 which would be missed by the use of intermittent arterial samples. The transcutaneous electrode can be employed usefully in intensive care monitoring of adult patients and in physiological studies where repeated arterial samples would otherwise be required.

Documentos Relacionados

• A simple method for the estimation of plasma ammonia using an ion specific electrode.
• Use of a combined oxygen and carbon dioxide transcutaneous electrode in the estimation of gas exchange during exercise.
• Proton translocation stoichiometry of cytochrome oxidase: use of a fast-responding oxygen electrode.
• Changes in transcutaneous oxygen tension during exercise in pulmonary emphysema.
• Use of transcutaneous oxygen tension, arterial oxygen saturation, and respiratory resistance to assess the response to inhaled methacholine in asthmatic children and normal adults.