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Research ArticleOriginal Contributions

A Novel Device for Measuring Long-Term Oxygen Therapy Adherence: A Preliminary Validation

Sun-Kai V Lin, Samuel T Kuna and Daniel K Bogen
Respiratory Care March 2006, 51 (3) 266-271;
Sun-Kai V Lin
Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania.
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  • For correspondence: [email protected]
Samuel T Kuna
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, Philadelphia, Pennsylvania.
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Daniel K Bogen
Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania.
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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.

  • adherence
  • compliance
  • monitor
  • long-term oxygen therapy

Footnotes

  • Correspondence: Sun-Kai V Lin PhD, Department of Bioengineering, University of Pennsylvania, 120 Hayden Hall, 3320 Smith Walk, Philadelphia PA 19104. E-mail: sunkai.lin{at}gmail.coma.
  • Copyright © 2006 by Daedalus Enterprises Inc.
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Respiratory Care: 51 (3)
Respiratory Care
Vol. 51, Issue 3
1 Mar 2006
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A Novel Device for Measuring Long-Term Oxygen Therapy Adherence: A Preliminary Validation
Sun-Kai V Lin, Samuel T Kuna, Daniel K Bogen
Respiratory Care Mar 2006, 51 (3) 266-271;

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A Novel Device for Measuring Long-Term Oxygen Therapy Adherence: A Preliminary Validation
Sun-Kai V Lin, Samuel T Kuna, Daniel K Bogen
Respiratory Care Mar 2006, 51 (3) 266-271;
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