Evaluation of an auto-nCPAP device based on snoring detection

Abstract

E Ev va al lu ua at ti io on n o of f a an n a au ut to o--n nC CP PA AP P d de ev vi ic ce e b ba as se ed d o onWe observed that a single night of auto-nCPAP improved the apnoea/hypnoea index (AHI) (12±21 vs 51±31 disordered breathing events·h -1 of sleep (mean±SD)), the awakening-arousal index (13±20 vs 40±26 arousals·h -1 of sleep), and duration of slow wave sleep (102±49 vs 71±56 min) but not of rapid eye movement (REM) sleep (55±31 vs 64±38 min). Auto-nCPAP was effective (apnoea/hypopnoea and arousal indices <10 events·h -1 ) in all but three patients. Auto-nCPAP was ineffective in one patient, whose obstructive respiratory events were not preceded by nasal mask pressure vibration detection, and in two patients who were quasi-permanent mouth breathers.Snoring detection may be effective in sleep apnoea syndrome with heavy snoring and without permanent mouth breathing, during the first night of nasal continuous positive airway pressure treatment.

Snoring detection during auto-nasal continuous positive airway pressure

“…The authors recently conducted a clinical study of an auto-nCPAP device (rapid eye movement (REM)zauto) that was the precursor of the Goodknight 418A and had similar sensitivity for snoring detection (unpublished data). It was found that this device induced no detrimental pressure increases [7,8]. Moreover, in one of the 15 patients, who was described by their bed partner as an almost continuous snorer, this auto-nCPAP device failed to detect snoring because the sound was not loud enough [7].…”

“…It was found that this device induced no detrimental pressure increases [7,8]. Moreover, in one of the 15 patients, who was described by their bed partner as an almost continuous snorer, this auto-nCPAP device failed to detect snoring because the sound was not loud enough [7]. This result was confirmed by a study reported in abstract form [9], in which snoring was recorded by a stethoscope secured to the trachea in 13 patients who used the precursor of the Goodknight 418A.…”

Noninvasive mechanical ventilation in acute hypoxaemic respiratory failure

“…Some ventilators designed for home NIMV are using a single inspirationexpiration circuit with a connector which permits venting of expiratory gas towards the atmosphere between the mask and the circuit. However, using such a system, a significant rebreathing has been demonstrated [54][55][56] which can be relevant clinically in patients with high minute ventilation as it may be observed in those with HRF. Therefore in patients having HRF, it is warmly recommended to use a nonrebreathing valve and a separate circuit for expiration.…”

“…This is an important technological issue that has been recently discussed [54][55][56]. Some ventilators designed for home NIMV are using a single inspirationexpiration circuit with a connector which permits venting of expiratory gas towards the atmosphere between the mask and the circuit.…”

Effect of zopiclone on sleep, night-time ventilation, and daytime vigilance in upper airway resistance syndrome

“…In that study, slow wave sleep values were normal in middle-aged nonapnoeic snorers with an arousal index of less than 10 events·h -1 (mean 7±2 events·h -1 ), but were abnormal in those with an arousal index of more than 10 events·h -1 (mean 15±5 events·h -1 ). In addition, in another recent study, we observed that successfully treated sleep apnoea syndrome (SAS) patients had less than 10 short EEG arousals·h -1 during sleep [25]. These findings show that when we used the ASDA criteria in our laboratory, arousals occurring at a rate of more than 10 events·h -1 significantly affect the architecture of nocturnal sleep.…”