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• W2169957962 abstract "We wished to determine the severity of posthypoxic ventilatory decline in patients with sleep apnea relative to normal subjects during sleep. We studied 11 men with sleep apnea/hypopnea syndrome and 11 normal men during non-rapid eye movement sleep. We measured EEG, electrooculogram, arterial O(2) saturation, and end-tidal P(CO2). To maintain upper airway patency in patients with sleep apnea, nasal continuous positive pressure was applied at a level sufficient to eliminate apneas and hypopneas. We compared the prehypoxic control (C) with posthypoxic recovery breaths. Nadir minute ventilation in normal subjects was 6.3 +/- 0.5 l/min (83.8 +/- 5.7% of room air control) vs. 6.7 +/- 0.9 l/min, 69.1 +/- 8.5% of room air control in obstructive sleep apnea (OSA) patients; nadir minute ventilation (% of control) was lower in patients with OSA relative to normal subjects (P < 0.05). Nadir tidal volume was 0.55 +/- 0.05 liter (80.0 +/- 6.6% of room air control) in OSA patients vs. 0.42 +/- 0.03 liter, 86.5 +/- 5.2% of room air control in normal subjects. In addition, prolongation of expiratory time (Te) occurred in the recovery period. There was a significant difference in Te prolongation between normal subjects (2.61 +/- 0.3 s, 120 +/- 11.2% of C) and OSA patients (5.6 +/- 1.5 s, 292 +/- 127.6% of C) (P < 0.006). In conclusion, 1) posthypoxic ventilatory decline occurred after termination of hypocapnic hypoxia in normal subjects and patients with sleep apnea and manifested as decreased tidal volume and prolongation of Te; and 2) posthypoxic ventilatory prolongation of Te was more pronounced in patients with sleep apnea relative to normal subjects." @default.
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• W2169957962 date "2004-06-01" @default.
• W2169957962 modified "2023-10-18" @default.
• W2169957962 title "Posthypoxic ventilatory decline during NREM sleep: influence of sleep apnea" @default.
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• W2169957962 doi "https://doi.org/10.1152/japplphysiol.01120.2003" @default.
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• W2169957962 hasPublicationYear "2004" @default.
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