Compliance of the tubing compartment of lung ventilators

Verheecke, G.; Gilbertson, A. A.

doi:10.1007/bf01709728

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…where LTVcc is the portion of tidal volume lost to gas compression and circuit compliance [4,5]. With the addition of PEEP, ventilatory circuit gas compression is required not only to increase pressure from end-…”

Section: Discussionmentioning

confidence: 99%

Positive end-expiratory pressure: Implications for tidal volume changes in anesthesia machine ventilation

Elliott

Harris

Philip

1989

J Clin Monitor Comput

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In clinical practice, the addition of positive end-expiratory pressure (PEEP) into a standard anesthesia circle circuit decreases the delivered tidal volume (DTV) to a patient. We studied the magnitude of the delta DTV/delta PEEP relationship in two commonly used anesthesia systems. In addition, the magnitude of the delta DTV/delta PEEP relationship varies with both pulmonary compliance and volume of gas contained in the patient's breathing system between the ventilator and PEEP valve site, and this was also evaluated. Routine monitoring of expired tidal volume should be used whenever PEEP is added to an anesthesia circuit.

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Section: Discussionmentioning

confidence: 99%

Positive end-expiratory pressure: Implications for tidal volume changes in anesthesia machine ventilation

Elliott

Harris

Philip

1989

J Clin Monitor Comput

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“…The compliance of the tubings was considered assuming elastic flexible pipe walls. Considering that in a circular pipe where D = 20 mm and L = 1 m, and using typical values of tube compliance dV / dP = 1 ml / cm H 2 O [ 20 ] static pressure-diameter coefficient was determined dD / dP ≃ 4 ⋅ 10 −8 m Pa −1 . The length and internal diameter of the tubes used in this module are L = 1 m and D = 20 mm respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Also, P num aw 1 , P num aw 2 and P num esp are patient 1 numerical airway pressure, patient 2 numerical airway pressure, and numerical expiratory pressure respectively all as a function of R V . Functional J is plotted against R V in Fig 14 for three driving pressures (ΔP 2 [10,15,20] cm H 2 O. Therein, as R V = 1.5 cm H 2 O (L/s) −1 minimizes J, this was taken as the exhalatory resistance value for all the tests.…”

Section: Plos Onementioning

confidence: 99%

Exhalatory dynamic interactions between patients connected to a shared ventilation device

et al. 2021

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In this work a shared pressure-controlled ventilation device for two patients is considered. By the use of different valves incorporated to the circuit, the device enables the restriction of possible cross contamination and the individualization of tidal volumes, driving pressures, and positive end expiratory pressure PEEP. Possible interactions in the expiratory dynamics of different pairs of patients are evaluated in terms of the characteristic exhalatory times. These characteristic times can not be easily established using simple linear lumped element models. For this purpose, a 1D model using the Hydraulic and Mechanical libraries in Matlab Simulink was developed. In this sense, experiments accompany this study to validate the model and characterize the different valves of the circuit. Our results show that connecting two patients in parallel to a ventilator always resulted in delays of time during the exhalation. The size of this effect depends on different parameters associated with the patients, the circuit and the ventilator. The dynamics of the exhalation of both patients is determined by the ratios between patients exhalatory resistances, compliances, driving pressures and PEEPs. Adverse effects on exhalations became less noticeable when respiratory parameters of both patients were similar, flow resistances of valves added to the circuit were negligible, and when the ventilator exhalatory valve resistance was also negligible. The asymmetries of driving pressures, compliances or resistances exacerbated the possibility of auto-PEEP and the increase in relaxation times became greater in one patient than in the other. In contrast, exhalatory dynamics were less sensitive to the ratio of PEEP imposed to the patients.

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Ventilateurs d'anesthésie

Otteni

Beydon²,

et al. 1997

Annales Françaises d'Anesthésie et de Réanimation

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Compliance of the tubing compartment of lung ventilators

Cited by 6 publications

References 1 publication

Positive end-expiratory pressure: Implications for tidal volume changes in anesthesia machine ventilation

Positive end-expiratory pressure: Implications for tidal volume changes in anesthesia machine ventilation

Exhalatory dynamic interactions between patients connected to a shared ventilation device

Ventilateurs d'anesthésie

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