Head position modifies upper airway resistance in men

Liistro, Giuseppe; Stanescu, Dinu; Dooms, Grégoire; Rodenstein, D.; Veriter, C.

doi:10.1152/jappl.1988.64.3.1285

Cited by 50 publications

(24 citation statements)

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“…position can modify upper airway resistance, as shown by Liistro et al 13 in healthy adults. In our study, all measurements were performed while supporting the cheeks; this is important in obstructed patients, as has been demonstrated for the plethysmographic method, 14 the oscillation method 15 -especially in young children, 16 and also for the interrupter technique.…”

Section: Rrsint Measurementsmentioning

confidence: 79%

Interrupter technique versus plethysmography for measurement of respiratory resistance in children with asthma or cystic fibrosis

et al. 2000

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Section: Rrsint Measurementsmentioning

confidence: 79%

Interrupter technique versus plethysmography for measurement of respiratory resistance in children with asthma or cystic fibrosis

et al. 2000

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“…Air leaks and communication between the oral and nasal compartments of the facemask were meticulously excluded by regular testing throughout each test night, as per the authors normal routine [1]. Subjects wore a soft neck collar to stabilise neck position during sleep, as neck position can influence upper airway resistance [5][6][7].…”

Section: Methodsmentioning

confidence: 99%

Effect of nasal or oral breathing route on upper airway resistance during sleep

Fitzpatrick¹,

McLean²,

Urton³

et al. 2003

Eur Respir J

220

132

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Healthy subjects with normal nasal resistance breathe almost exclusively through the nose during sleep. This study tested the hypothesis that a mechanical advantage might explain this preponderance of nasal over oral breathing during sleep.A randomised, single-blind, crossover design was used to compare upper airway resistance during sleep in the nasal and oral breathing conditions in 12 (seven male) healthy subjects with normal nasal resistance, aged 30¡4 (mean¡SEM) yrs, and with a body mass index of 23¡1 kg?m 2 . During wakefulness, upper airway resistance was similar between the oral and nasal breathing routes. However, during sleep (supine, stage two) upper airway resistance was much higher while breathing orally (median 12.4 In a recent publication the authors described, for the first time, partitioning of inhaled ventilation between the nose and mouth during sleep in healthy subjects with normal nasal resistance [1]. The main finding of the latter study was that the oral fraction of inhaled ventilation during sleep was very small, averaging only 4% for the group of 10 subjects, and several subjects did not breathe through their mouth at all during sleep. Furthermore, the inhaled oral fraction did not change significantly between different non-rapid eye movement sleep stages or between rapid eye movement (REM) and non-REM sleep.The physiological explanation for the marked predominance of nasal ventilation over oral ventilation during sleep in normal subjects is unknown. Since total airway resistance while awake and breathing through the mouth is typically 2-4 cmH 2 O?L -1 ?s -1 [2] and the normal nasal resistance alone is of similar magnitude [3], it is not intuitively obvious why healthy subjects should choose to breathe almost exclusively through the nasal route during sleep. Specifically, there are no published measurements describing the effect of oral versus nasal breathing on upper airway resistance during sleep.It is important to understand the influence of the breathing route (oral or nasal) on upper airway resistance during sleep from the perspective of understanding normal respiratory physiology during sleep, but this information may also provide an insight into the relationship between the breathing route and upper airway obstruction during sleep. The authors hypothesised that the observed preponderance of nasal over oral ventilation in normal subjects during sleep would reflect a mechanical advantage of the nasal breathing route. To test this hypothesis, the authors compared upper airway resistance during nasal breathing and during oral breathing in healthy sleeping subjects with normal nasal resistance. Methods Study designA randomised, single blind, crossover study was conducted to compare upper airway resistance during sleep when nose breathing with that when mouth breathing. Subjects underwent a single overnight polysomnogram at Kingston General Hospital Sleep Laboratory, Ontario. The night was divided into two parts, oral breathing and nasal breathing, the order being randomised...

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“…We obtained regular and consistent breathing in our children after they were familiarized with the procedure during tidal breathing without triggering the shutter of the interrupter. All of our measurements were performed in the same position, i.e., the child sitting with the head in a neutral position; this was important because head position may modify upper airway resistance as shown by Liistro et al 11 in healthy adults.…”

Section: Conditions Of Measurementsmentioning

confidence: 99%