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SLEEP - Article Abstract

Volume :	32
Issue :	11
Pages :	1521-1527

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THERMAL INFRARED IMAGING FOR AIR FLOW DURING PSG
Thermal Infrared Imaging: A Novel Method to Monitor Airflow During Polysomnography

Jayasimha N. Murthy, MD, D.ABSM¹; Johan van Jaarsveld, MD¹; Jin Fei, PhD²; Ioannis Pavlidis, PhD²; Rajesh I Harrykissoon, MD¹; Joseph F. Lucke, PhD³; Saadia Faiz, MD¹; Richard J. Castriotta, MD, D.ABSM¹

¹Division of Pulmonary, Critical Care and Sleep Medicine, University of Texas Health Science Center at Houston, Houston, TX; ²Department of Computer Science, University of Houston, Houston, TX; ³Center for Clinical Research and Evidence Based Medicine, University of Texas Health Science Center at Houston, Houston, TX

Study Objectives: This is a feasibility study designed to evaluate the accuracy of thermal infrared imaging (TIRI) as a noncontact method to monitor airflow during polysomnography and to ascertain the chance-corrected agreement (κ) between TIRI and conventional airflow channels (nasal pressure [Pn], oronasal thermistor and expired co₂ [P_ECO₂]) in the detection of apnea and hypopnea.

Design: Subjects were recruited to undergo polysomnography for 1 to 2 hours, during which simultaneous recordings from electroencephalography, electrooculography, electromyography, respiratory impedance plethysmography, conventional airflow channels, and TIRI were obtained.

Setting: University-affiliated, American Academy of Sleep Medicine-accredited sleep disorders center.

Patients or Participants: Fourteen volunteers without a history of sleep disordered breathing and 13 patients with a history of obstructive sleep apnea were recruited.

Measurements and Results: In the detection of apnea and hypopnea, excellent agreement was noted between TIRI and thermistor (κ = 0.92, Bayesian Credible Interval [BCI] 0.86, 0.96; pκ = 0.99). Good agreement was noted between TIRI and Pn (κ = 0.83, BCI 0.70, 0.90; pκ = 0.98) and between TIRI and P_ECO₂(κ = 0.80, BCI 0.66, 0.89; pκ = 0.94).

Conclusions: TIRI is a feasible noncontact technology to monitor airflow during polysomnography. In its current methodologic incarnation, it demonstrates a high degree of chance-corrected agreement with the oronasal thermistor in the detection of apnea and hypopneas but demonstrates a lesser degree of chance-corrected agreement with Pn. Further overnight validation studies must be performed to evaluate its potential in clinical sleep medicine.

Keywords: Sleep apnea syndromes, sleep disordered breathing, sleep apnea, sleep hypopnea, thermography, polysomnography, sleep monitoring

Citation: Murthy JN; van Jaarsveld J; Fei J; Pavlidis I; Harrykissoon R; Lucke JF; Faiz S; Castriotta RJ. Thermal infrared imaging: a novel method to monitor airflow during polysomnography. SLEEP 2009;32(11):1521-1527.