P062 Agreement between arterial and capillary CO2 level in patients undergoing sleep study for suspected hypoventilation

Abstract Background Measurement of arterial CO2 (PaCO2) is the gold standard for diagnosis sleep hypoventilation during polysomnography. However, PaCO2 measurement a labour-intensive and painful. Previous audit in our unit demonstrated ABGs are often delayed or omitted when requested. Continuous monitoring transcutaneous carbon dioxide (TcCO2) used as surrogate marker PaCO2, however caution should be applied interpreting TcCO2 due to “sensor drift” phenomenon. Arterialized capillary blood gas (CBG) has been described various settings many respiratory units. Concordance with ABG TcCO2, however, poorly literature. A retrospective review was performed assess concordance arterialized level (PcCO2) measured routine Methods This patients provisional sleep-related syndrome who attended Sunshine Coast University Hospital Sleep Disorders Centre overnight studies. monitored PcCO2 at outset completion study. results will compared concordance. Where an simultaneously CBG reported. Progress Date Full follow. It anticipated that 30-40 included. Few were performed. Anticipated outcome Initial evaluation suggests may viable alternative based on limited data. superior common phenomenon “drift”. prospective study, utilising ABG, needed.