scholarly journals Nasal Mask: An Alternative to Prevent Contagion during Essential Activities

2021 ◽  
Vol 34 (4) ◽  
Author(s):  
Gustavo Acosta-Altamirano
Keyword(s):  
Nasal Mask

Influence of lung volume dependence of upper airway resistance during continuous negative airway pressure

1994 ◽  
Vol 77 (2) ◽  
pp. 840-844 ◽  
Author(s):  
F. Series ◽  
I. Marc
Keyword(s):  
Lung Volume ◽  
Airway Pressure ◽  
Airway Resistance ◽  
Upper Airway ◽  
Random Order ◽  
Pressure Increase ◽  
Nasal Mask ◽  
Upper Airway Resistance ◽  
Volume Dependence ◽  
Negative Airway Pressure

To quantify the contribution of lung volume dependence of upper airway (UA) on continuous negative airway pressure (CNAP)-induced increase in upper airway resistance, we compared the changes in supralaryngeal resistance during an isolated decrease in lung volume and during CNAP in eight normal awake subjects. Inspiratory supralaryngeal resistance was measured at isoflow during four trials, during two CNAP trials where the pressure in a nasal mask was progressively decreased in 3- to 5-cmH2O steps and during two continuous positive extrathoracic pressure (CPEP) trials where the pressure around the chest (in an iron lung) was increased in similar steps. The CNAP and CPEP trials were done in random order. During the CPEP trial, the neck was covered by a rigid collar to prevent compression by the cervical seal of the iron lung. In each subject, resistance progressively increased during the experiments. The increase was linearily correlated with the pressure increase in the iron lung and with the square of the mask pressure during CNAP. There was a highly significant correlation between the rate of rise in resistance between CNAP and CPEP: the steeper the increase in resistance with decreasing lung volume, the steeper the increase in resistance with decreasing airway pressure. Lung volume dependence in UA resistance can account for 61% of the CNAP-induced increase in resistance. We conclude that in normal awake subjects the changes in supralaryngeal resistance induced by CNAP can partly be explained by the lung volume dependence of this resistance.

Supine position decreases the ability of the nose to warm and humidify air

2001 ◽  
Vol 91 (6) ◽  
pp. 2459-2465 ◽  
Author(s):  
Paraya Assanasen ◽  
Fuad M. Baroody ◽  
Edward Naureckas ◽  
Julian Solway ◽  
Robert M. Naclerio
Keyword(s):  
Supine Position ◽  
Healthy Subjects ◽  
Air Conditioning ◽  
Upright Position ◽  
Nasal Mask ◽  
Total Water ◽  
Nasal Turbinate ◽  
Dry Air ◽  
Air Volume ◽  
Water Gradient

We tested the hypothesis that decreasing nasal air volume (i.e., increasing nasal turbinate blood volume) improves nasal air conditioning. We performed a randomized, two-way crossover study on the conditioning capacity of the nose in six healthy subjects in the supine and upright position. Cold, dry air (CDA) was delivered to the nose via a nasal mask, and the temperature and humidity of air were measured before it entered and after it exited the nasal cavity. The total water gradient (TWG) across the nose was calculated and represents the nasal conditioning capacity. Nasal volume decreased significantly from baseline without changing the mucosal temperature when subjects were placed in the supine position ( P < 0.01). TWG in supine position was significantly lower than that in upright position ( P < 0.001). In the supine position, nasal mucosal temperature after CDA exposure was significantly lower than that in upright position ( P < 0.01). Our data show that placing subjects in the supine position decreased the ability of the nose to condition CDA compared with the upright position, in contrast to our hypothesis.

scholarly journals A323 Fundamental study on the adaptive design system for NPPV nasal mask

2008 ◽  
Vol 2008.19 (0) ◽  
pp. 125-126
Author(s):  
Yusuke YOSHIDA ◽  
Keiichi NINOMIYA ◽  
Masafumi ODA ◽  
Toshiaki HARA
Keyword(s):  
Adaptive Design ◽  
Design System ◽  
Nasal Mask ◽  
Fundamental Study

scholarly journals Mechanical Evaluation for Fitting of NPPV Nasal Mask

2013 ◽  
Vol 25 (4) ◽  
pp. 124-129
Author(s):  
Masafumi Oda ◽  
Keiichi Ninomiya ◽  
Toshiaki Hara
Keyword(s):  
Nasal Mask

scholarly journals O037 Genioglossus motor control following the return to sleep after brief arousal

2021 ◽  
Vol 2 (Supplement_1) ◽  
pp. A16-A16
Author(s):  
A Dawson ◽  
J Avraam ◽  
C Nicholas ◽  
A Kay ◽  
J Trinder ◽  
...  
Keyword(s):  
Motor Units ◽  
Firing Frequency ◽  
Nasal Mask ◽  
Persistent Activity ◽  
Genioglossus Muscle ◽  
Single Motor Units ◽  
Airway Collapse ◽  
Obstructive Sleep ◽  
Persistent Firing ◽  
Healthy Participants

Abstract Rationale Arousal from sleep has been shown to elicit a prolonged increase in genioglossus muscle activity that persists following the return to sleep and may protect against airway collapse. We hypothesised that this increased genioglossal activity following return to sleep after an arousal is due to persistent firing of inspiratory single motor units (SMUs) recruited during the arousal. Methods 34 healthy participants were studied overnight while wearing a nasal mask/pneumotachograph to measure ventilation and with 4 intramuscular genioglossus SMU electrodes. During stable N2 and N3 sleep, auditory tones were played to induce brief (3-15s) AASM arousals. Ventilation and genioglossus SMUs were quantified for 5 breaths before the tone, during the arousal and for 10 breaths after the return to sleep. Results A total of 1089 tones were played and gave rise to 236 SMUs recorded across arousal and the return to sleep in 20 participants (age 23±4.2 years and BMI 22.5±2.2kg/m2). Ventilation was elevated above baseline during arousal and the first post-arousal breath (p&lt;0.001). The peak firing frequency of expiratory and tonic SMUs was unchanged during arousal and return to sleep, whereas inspiratory modulated SMUs were increased during the arousal and for 4 breaths following the return to sleep (p&lt;0.001). Conclusions The prolonged increase in genioglossus activity that occurs on return to sleep after arousal is a result of persistent activity of inspiratory SMUs. Strategies to elevate inspiratory genioglossus SMU activity may be beneficial in preventing/treating obstructive sleep apnea.

Dental and oral surgery

2019 ◽  
pp. 293-298
Author(s):  
Ed Carver
Keyword(s):  
Orthodontic Treatment ◽  
Oral Surgery ◽  
Nasal Mask ◽  
The Uk

Dental and oral surgery is one of the commonest reasons for providing anaesthesia to children in the UK. Other than simple extractions for caries, patients may present for restorative work and to facilitate orthodontic treatment. A familiarity with the techniques involved is essential, including that of airway maintenance with a nasal mask, which is still used in some centres.

Intermittent Positive Airway Pressure by Nasal Mask as a Treatment for Respiratory Insufficiency in a Patient with Syringomyelia

Respiration ◽  
2002 ◽  
Vol 69 (2) ◽  
pp. 169-174 ◽  
Author(s):  
Johan Verbraecken ◽  
M. Willemen ◽  
W. de Cock ◽  
P. Van de Heyning ◽  
W. de Backer
Keyword(s):  
Respiratory Insufficiency ◽  
Airway Pressure ◽  
Positive Airway Pressure ◽  
Nasal Mask
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