| Project/Area Number |
10557056
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Respiratory organ internal medicine
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
HIDA Watasu Graduate School of Medicine, Tohoku University, Associate Professor, 大学院・医学系研究科, 助教授 (10142944)
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| Co-Investigator(Kenkyū-buntansha) |
TAKENOUCHI Kiyoteru Graduate Institute Technology, Chief Investigator, 主任研究員
KIKUCHI Yoshihiro Graduate School of Medicine, Tohoku University, Lecturer, 大学院・医学系研究科, 講師 (20195217)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1998: ¥4,200,000 (Direct Cost: ¥4,200,000)
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| Keywords | sleep apnea / respiratory monitor / oro-nasal flow / oxygen saturation |
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| Research Abstract |
We have developed a new portable monitoring system for home assessment of sleep apnea and hypopnea. This device assesses three kinds of parameters : nasal airflow by thermistors, tracheal sound by microphone and arterial oxygen saturation by pulse oximeter(SpO2). In this new system, there are multiple parameters that indicate the degree of sleep disordered breathing. Reviewing the raw recordings of the absence of oronasal flow, absence of tracheal sound, puls rate, respiratory rate and SpO2, we could distinguish apnea episodes, desaturation episodes and apnea episodes with desaturation. An apnea episode was determined as a cessation of oronasal flow and/or a cessation of tracheal sound more than a certain duration chosen manually. A desaturation episode was construed as a set of SpO2 points decreasing continuously for more than a certain duration and degree. The mean value and distribution of some parameters, such as SpO2, nadir SpO2 during a desaturation episode, are available on demand. We can easily operate this system, and persons besides specialists such as the patient or patient's family can easily operate the new portable monitoring system. This system was developed on a commercial basis. We believe that this system will contribute to the progress of sleep studies.
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