Authors: Lin, Sun-Kai V.¹; Kuna, Samuel T.²; Bogen, Daniel K.³

Source: Respiratory Care, Volume 51, Number 3, January 2006 , pp. 266-271(6)

Publisher: The Journal Respiratory Care Company

Abstract:

INTRODUCTION: Current methods for measuring patient adherence to long-term oxygen therapy fail to measure the actual amount of time the patient is inhaling oxygen and the pattern of oxygen use within the day. We have developed a novel oxygen-adherence monitor to address these limitations, and this report introduces the monitor and provides preliminary data validating its use. METHODS: This battery-powered monitor attaches to the oxygen source and detects respiratoryrelated pressure fluctuations transmitted through the nasal cannula. The monitor takes a measurement over a 25-second period, at 4-min intervals. It detects and stores data on 4 different states that describe the patient's actual use of the oxygen source and nasal cannula: source-off/cannula-off, source-off/cannula-on, source-on/cannula-off, and source-on/cannula-on. We studied the monitor's performance with 10 patients with chronic obstructive pulmonary disease, during a directly-observed sequence of using and not using supplemental oxygen via nasal cannula, while sitting and walking. RESULTS: The monitor correctly detected 122 out of 129 measurements among all participants, yielding a 95% detection accuracy. CONCLUSION: A monitor that objectively measures oxygen inhalation, rather than oxygen expenditure, may help improve the management of patients on long-term oxygen therapy.

Keywords: ADHERENCE; COMPLIANCE; MONITOR; LONG-TERM OXYGEN THERAPY

Document Type: Research article

Affiliations: 1: Department of Bioengineering, University of Pennsylvania, 120 Hayden Hall, 3320 Smith Walk, Philadelphia PA 19104;, Email: sunkai.lin@gmail.com 2: Pulmonary, Allergy, and Critical Care Division, Department of Medicine, and with the Center for Sleep and Respiratory Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania, and with the Philadelphia Veterans Affairs Medical Center, 3: Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania

Publication date: 2006-01-01

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