Non-contact determination of parasympathetic activation induced by a full stomach using microwave radar

Gotoh, Shigeyoshi; Suzuki, Satoshi; Imuta, Hayato; Kagawa, Masayuki; Badarch, Zorig; Matsui, Takemi

doi:10.1007/s11517-009-0506-4

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Based on these findings, we began to investigate the applicability of small microwave Doppler radar modules for the measurement of human vital signs [7,11,12]. In our recent studies, we compared the clinical usefulness of radar and CO 2 sensors [13], radar and SpO 2 sensors [14], and radar and PSG [15].…”

Section: Introductionmentioning

confidence: 99%

The Development of a Dual-Radar System with Automatic Hypopnea Threshold Optimization for Contact-Free Sleep Apnea-Hypopnea Syndrome Screening

Gotoh¹,

Matsui²,

Naka³

et al. 2018

Journal of Sensors

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Full-night polysomnography (PSG) examination is regarded as the gold standard for the diagnosis of sleep apnea-hypopnea syndrome (SAHS). However, PSG requires the placement of multiple sensors on the head, face, and chest, which can impose a heavy strain on patients. Therefore, in the present study, we aimed to develop a contact-free, stand-alone SAHS screening system that eliminates body movement artifacts based on automatic optimization of the hypopnea threshold. Doppler radar sensors were placed beneath a mattress. In order to achieve high sensitivity and specificity, the hypopnea was based on the average amplitude of respiration during the full sleep period. The threshold was determined via receiver operating characteristic (ROC) analysis using PSG as a reference. We conducted full-night clinical tests of the proposed system in 27 patients with suspected SAHS (49 ± 12 years) at Tomei Atsugi Hospital. When predicting the severity of SAHS with an apnea-hypopnea index (AHI) of >30/h using PSG as a reference, the proposed system achieved a sensitivity of 100% and a specificity of 100%. These results represent a drastic improvement over those of our previous study (sensitivity: 90%; specificity: 79%).

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Section: Introductionmentioning

confidence: 99%

The Development of a Dual-Radar System with Automatic Hypopnea Threshold Optimization for Contact-Free Sleep Apnea-Hypopnea Syndrome Screening

Gotoh¹,

Matsui²,

Naka³

et al. 2018

Journal of Sensors

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A study for Nobel non-contact sleep respiration disorder measuring system utilizing micro-wave radar and application to screening of sleep apnea syndrome and other sleep respiratory disorder.

Gotoh¹,

Matsui²,

Yamashita³

et al. 2014

Iryou kikigaku (The Japanese journal of medical instrumentation

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A clinical study for non-contact sleep respirometry with microwave radar, monitored by simultaneous measuring with polysomnography.

Gotoh¹,

Kaneko²,

Matsui³

et al. 2016

Iryou kikigaku (The Japanese journal of medical instrumentation

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We have developed a non-contact microwave radar respirometry method, where the microwave radars are located under the bed, they do not increase the strain on the subjects. In order to evaluate the effectiveness of the microwave radar respirometry, we have conducted clinical tests to make a comparison between the proposed non-contact method and polysomnograph (PSG). We tested the proposed system on twenty subjects suspected to have Sleep Apnea Syndrome (SAS) (male 16, female 4, age 35 to 67, average 49.8±10.1 years old). PSG was adopted as a reference to determine Apnea Hypopnea events. The proposed method detected 75.6% of Apnea Hypopnea events, (2,810 out of 3,716 events), and it was 58.8% of total radar events (2,810 out of 4,780 radar events.).

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Non-contact determination of parasympathetic activation induced by a full stomach using microwave radar

Cited by 5 publications

References 6 publications

The Development of a Dual-Radar System with Automatic Hypopnea Threshold Optimization for Contact-Free Sleep Apnea-Hypopnea Syndrome Screening

The Development of a Dual-Radar System with Automatic Hypopnea Threshold Optimization for Contact-Free Sleep Apnea-Hypopnea Syndrome Screening

A study for Nobel non-contact sleep respiration disorder measuring system utilizing micro-wave radar and application to screening of sleep apnea syndrome and other sleep respiratory disorder.

A clinical study for non-contact sleep respirometry with microwave radar, monitored by simultaneous measuring with polysomnography.

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