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. Author manuscript; available in PMC: 2013 Jul 19.
Published in final edited form as: Pract Neurol (Fort Wash Pa). 2010 September/October;9(5):26–31.

Figure 1.

Figure 1

Portable overnight oximetry in a 77-year-old man with obstructive sleep apnea. Numerous oscillatory desaturations are seen, especially between 2–3 AM and 4–5 AM, consistent with obstructive sleep disordered breathing. The oxygen desaturation index (hourly rate of 4% or greater oxyhemoglobin desaturations) was 15/hour, and subsequent polysomnography confirmed moderately severe obstructive sleep apnea, with apnea-hypopnea index of 24/hour, with predominant obstructive apneic events occurring during supine position sleep. Nasal continuous positive airway pressure therapy at 15 centimeters of water optimal pressure effectively treated his apnea, and one month later his sleepiness had resolved after adherence with treatment.