Assessing the performance of the Whisperflow® continuous positive airway pressure generator: a bench study

Glover, Guy; Fletcher, Stephen J.

doi:10.1093/bja/aep077

Cited by 25 publications

(33 citation statements)

References 21 publications

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“…When a patient's inspiratory air flow exceeds the air flow delivered by the CPAP equipment, airway pressure will fall, which will increase respiratory work and possibly lead to fatigue. 10,11,22 Though the Borg CR10 scale is subjective and not a pressure-related measure of WOB, the perceived exertion scores from our subjects were quite low for all CPAP levels. Inter-individual differences in perceived exertion increased at higher CPAP levels.…”

Section: Discussionmentioning

confidence: 60%

“…The at-rest flow is reported to be 20 -30 L/min, and in respiratory failure flow over 100 L/min is often seen. 11 To simulate respiratory distress, our participants took 10 deep, forced breaths, and had flows of 88 -97 L/min, which is consistent with flows reported during respiratory distress. 11 Our instructions to the participants on how to perform the forced breaths can be questioned.…”

Section: Discussionmentioning

confidence: 63%

“…Pressure changes during breathing with CPAP are associated with increased work of breathing, 10,11,22 and it is therefore important that airway pressure is stable during the whole breathing cycle. When a patient's inspiratory air flow exceeds the air flow delivered by the CPAP equipment, airway pressure will fall, which will increase respiratory work and possibly lead to fatigue.…”

Section: Discussionmentioning

confidence: 99%

“…If pressure changes occur, respiratory work increases, which can lead to respiratory fatigue. 10,11 The Boussignac CPAP system (Vygon, É couen, France) includes a plastic tube (5.5-cm long, inner diameter 13 mm) that has 4 micro-channels in the tube wall (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Pneumatic Performance of the Boussignac CPAP System in Healthy Humans

et al. 2011

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BACKGROUND:The Boussignac continuous positive airway pressure (CPAP) device effectively treats acute pulmonary edema, but data on airway pressure with the Boussignac CPAP system are sparse. OBJECTIVE: To evaluate the Boussignac CPAP system's ability to maintain stable inspiratory and expiratory pressure levels, and to evaluate perceived exertion during breathing with the Boussignac CPAP system. METHODS: With 18 healthy volunteers we recorded airway pressure and air flow during 10-min sessions at 5.0, 7.5, and 10.0 cm H 2 O. The participants were blinded to the sequence of the CPAP levels. Each session was ended with 10 forced breaths. We measured perceived exertion with the Borg category ratio 10 (Borg CR10) scale. RESULTS: When the participants breathed at 20% of vital capacity and a peak expiratory flow of 14% of FEV 1 , the maximum pressure difference between inspiration and expiration was 4.0 cm H 2 O at CPAP 10 cm H 2 O. The changes in airway pressure were never large enough to reduce airway pressure to below zero. During the forced breaths, the expiratory volume was 38 -42% of vital capacity and peak expiratory flow was 49 -56% of FEV 1 . As air flow increased, both the drop in inspiratory airway pressure and the increase in expiratory airway pressure increased. CONCLUSIONS: With CPAP, pressure changes are considered to be associated with increased work of breathing. The device's pneumatic performance is adequate during normal breathing with low air flow, but during forced breathing (high air flow) it did not maintain stable airway pressure, which could increase the work of breathing and cause respiratory fatigue. Thus, the Boussignac CPAP system might be less suitable for a patient breathing at a higher frequency.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pneumatic Performance of the Boussignac CPAP System in Healthy Humans

et al. 2011

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“…Médias e desvios padrão das medidas de frequência respiratória, volume corrente e volume minuto nos grupos fisioterapia respiratória convencional e fisioterapia respiratória convencional associada à pressão positiva contínua nas vias aéreas, no pré e pós-operatório de cirurgia bariátrica 30 , que pode ter de certa forma, subotimizado o recurso em questão.…”

Section: Resultsunclassified

Fisioterapia respiratória associada à pressão positiva nas vias aéreas na evolução pós-operatória da cirurgia bariátrica

et al. 2012

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RESUMO | Analisar volume corrente (VC), volume minuto (VM) e frequência respiratória (FR) de obesas mórbidas no pós-operatório de cirurgia bariátrica (CB), após a fisioterapia respiratória convencional (FRC) associada ou não à pressão positiva contí-nua nas vias aéreas (CPAP) no pré-operatório. Foram estudadas 36 mulheres, com idade de 40, 1±8, 41 anos, que seriam submetidas à CB por laparotomia e que realizaram FRC (exercícios respiratórios diafragmáticos, de inspirações profundas, fracionadas e associados a movimentos de membros superiores, 1 série de 10 repetições de cada exercício) por 30 dias antes da cirurgia. Após internação, 18 delas foram submetidas a 20 minutos de CPAP, 1 hora antes da indução anestésica e compuseram o grupo FRC+CPAP. As outras 18 não receberam o CPAP e compuseram o grupo FRC. Foram avaliados VM, VC e FR por meio do ventilômetro, no momento da internação e 24 horas após a realização da cirurgia. Constatou-se que as medidas de VC, VM e FR não apresentaram significância estatística quando comparados os resultados do pré e pós-operatório em ambos os grupos, bem como quando comparados os dois grupos entre si tanto no pré como no pós-operatório. Os resultados sugerem que a tanto a aplicação da FRC como a aplicação da FRC+CPAP no período pré-operatório contribui para a manutenção das variá-veis respiratórias no pós-operatório. A aplicação do CPAP antes da indução anestésica não promoveu benefícios adicionais no pós-operatório de CB no que se refere aos volumes pulmonares.Descritores | cirurgia bariátrica; pressão positiva contínua nas vias aéreas; medidas de volume pulmonar; fisioterapia.ABSTRACT | To assess the tidal volume (VT), minute volume (MV) and respiratory rate (RR) of morbidly obese women in postoperative bariatric surgery (BS), after the conventional respiratory physiotherapy (CRP) with or without preoperatively continuous positive airway pressure (CPAP). Thirty-six women, aged 40. 1±8. 41 years, that would be submitted to BS by laparotomy were studied. All of them underwent preoperative outpatient conventional respiratory physiotherapy (CRP) (diaphragmatic breathing exercises, deep breathing, fractionated breathing and breathing associated to movements of the upper limbs, a series of 10 repetitions of each exercise) by 30 days. Once admitted, 18 were subjected to 20 minutes of CPAP, an hour before induction of anesthesia and composed group CRP+CPAP. The other 18 did not receive CPAP and composed group CRP. VT, MV, and RR were performed through the ventilometer, at admission and 24 hours after surgery. It was found that measures of TV, VM and RR were not statistically significant when comparing pre and postoperative in both groups and as well as when the two groups were compared between them in both pre and postoperative. The results suggest that both the application and the implementation of FRC and FRC+CPAP in the preoperative period contribute to the maintenance of respiratory variables in the postoperative period. The use of CPAP before induction of anesthesia, did not provide...

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Equipment Technology for Noninvasive Ventilation in Pre-hospital Setting

LeCroy

2023

Noninvasive Mechanical Ventilation

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Assessing the performance of the Whisperflow® continuous positive airway pressure generator: a bench study

Cited by 25 publications

References 21 publications

Pneumatic Performance of the Boussignac CPAP System in Healthy Humans

Pneumatic Performance of the Boussignac CPAP System in Healthy Humans

Fisioterapia respiratória associada à pressão positiva nas vias aéreas na evolução pós-operatória da cirurgia bariátrica

Equipment Technology for Noninvasive Ventilation in Pre-hospital Setting

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