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Clinical Investigations: SLEEP |

Validation of the POLY-MESAM Seven-Channel Ambulatory Recording Unit*

Thomas Verse, MD; Wolfgang Pirsig, MD; Bernhard Junge-Hülsing, MD; Béatrice Kroker, MD
Author and Funding Information

*From the University of Ulm, Otorhinolaryngological Clinic Section for Rhinology und Rhonchopathies, Ulm, Germany.

Correspondence to: Thomas Verse, MD, Universitäts-Hals-Nasen-Ohren-Klinik Ulm, Prittwitzstrasse 43, 89075 Ulm, Germany;



Chest. 2000;117(6):1613-1618. doi:10.1378/chest.117.6.1613
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Study objectives: To determine the recording capabilities of the POLY-MESAM (PM) unit (MAP; Martinsried, Germany), an American Sleep Disorders Association level III system, and to compare it with simultaneous 12-channel polysomnography in the sleep laboratory.

Measurements and results: Fifty-three patients (49 men and 4 women) with obstructive sleep-related breathing disorders of varying severity were included. The apnea-hypopnea indexes (AHIs) obtained using the two methods differed significantly from each other, although the correlation was close. The PM unit produced false-negative results in patients with mild to moderate obstructive sleep apnea (OSA). The sensitivity of the PM unit in detecting patients with an AHI > 10 was 92%, while the specificity was 96.3%.

Conclusions: The correlation of AHIs obtained with polysomnography and with the PM unit is close. However, in some cases, the PM may underestimate OSA parameters. The PM unit produces false-negative results in patients with mild to moderate OSA. While inpatient polysomnography remains the “gold standard,” the PM unit may provide an inexpensive alternative in some special cases.

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