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* From the Department of Medicine (Dr. Epstein) and Sleep Disorders Center (Dr. Epstein and Ms. Chicoine), Roger Williams Medical Center, Providence, RI; Boston University School of Medicine, Boston, MA (Dr. Epstein); Brown University School of Medicine (Dr. Epstein), Providence, RI; and Department of Computer Science and Statistics (Dr. Hanumara), University of Rhode Island, Kingston, RI.
Correspondence to: Matthew D. Epstein, MD, FCCP, 7 Powder Horn Terr, Randolph, NJ 07869
Study objectives: To determine the diagnostic utility of a nasal cannula/pressure transducer (NC), in comparison to thermistor (TH), during routine, clinical nocturnal polysomnography (NPSG).
Design: We analyzed the respiratory arousal index (RAI) using TH (RAI-TH) or NC (RAI-NC) in patients with suspected sleep-disordered breathing (SDB).
Setting: Sleep disorders center of a university-affiliated teaching hospital.
Patients: Fifty consecutive, nonselected patients referred for evaluation of suspected SDB.
Measurements and
results: Twenty patients were found to have obstructive sleep
apnea/hypopnea syndrome (OSA), 25 had upper airway resistance syndrome
(UARS), and 5 had primary snoring (PS). Mean RAI-NC was greater than
the mean RAI-TH by 25%, 302%, and 500% in OSA, UARS, and PS,
respectively. RAI-NC was 
14 (mean, 25.2) in UARS and < 14 (mean,
9) in PS. Mean RAI-TH was 8.4 in UARS and 1.8 in PS, with significant
overlap between the two groups.
Conclusions: NC is more sensitive than TH in detecting respiratory events during NPSG and may represent a simple, objective means to identify UARS among patients with a range of SDB.
Key Words: diagnosis • nasal cannula/pressure transducer • sleep-disordered breathing • upper airway resistance syndrome
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