Capillary versus arterial blood gases. Accuracy, acceptability, and suitability for use during sleep studies to calibrate transcutaneous carbon dioxide measurement

Abstract

Purpose: To determine whether capillary blood gas carbon dioxide values can substitute for arterial sampling to calibrate transcutaneous carbon dioxide during polysomnography. Methods: Participants underwent capillary (arterialized earlobe) and blood gas (radial artery) sampling at polysomnography commencement (Evening) and end (Morning). Participant and scientist sample preference, and participant pain were recorded. The transcutaneous offset from the corresponding arterial/capillary sample, and the transcutaneous electrode drift over the night were determined. Results: Seventy-five people consented and 44 had complete paired timepoint data. Both the capillary and arterial carbon dioxide va..