RT Journal Article SR Electronic T1 Adherence to ambulatory liquid oxygen using comercialized dual pressure transducers JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP P3727 VO 42 IS Suppl 57 A1 Mafalda van Zeller A1 Ermelinda Eusébio A1 José Amorim A1 João Almeida A1 João Carlos Winck YR 2013 UL http://erj.ersjournals.com/content/42/Suppl_57/P3727.abstract AB Introduction-Treatment adherence is widely recognized as a critical problem in long term oxygen therapy particularly the use of ambulatory liquid oxygen (LOX) systems. Adherence monitoring strategies could be helpful managing patients.Aim-Evaluate patient's adherence to LOX using Visionox®, and compare results with a patient's adherence diary and patient's global perception of use.Methods-Patients using LOX were recruited for a clinical interview, the number of days/week and mean time of use according to patient perception were recorded. Afterwards an adherence diary was given to fulfill for 14 days. During that time Visionox® (Air Products) was attached to the LOX. Visionox® is a small device that uses pressure transducers to detect oxygen flow and patien's respiratory rate, recording it - information is downloaded using dedicated software.Results-19 patients were included, 57.9% male, mean age 61 years old. When asked about their perception of LOX use they reported a mean use of 88.7% of days (78.9% said to use it every day) for a mean time of 03h22m/day.During the 14 days of evaluation, according to the diary the mean use was 75.26% of days for 04h30m and according to the Visionox® it was 72.25% of the days for a mean 04h06m. No difference was found between those methods. Regarding the %days of use declared by the patients it was significantly higher than the dairy (p=0.01) and the Visionox® (p=0.01) monitoring.Conclusion-Patients overestimated LOX daily use compared to the adherence found using an adherence diary and objective adherence monitoring. Although no significant difference was found comparing diary and Visionox® use, they could both be helpful in clinical practice.