[Dynamics of pressure and flow curves of various expiratory pressure valves]. / Dynamik von Druck- und Flusskurven verschiedener Auslassventile.
Med Klin (Munich)
; 92 Suppl 1: 82-4, 1997 Apr 28.
Article
en De
| MEDLINE
| ID: mdl-9235483
ABSTRACT
BACKGROUND:
Flow dynamics of exhalation valves in home care ventilators (CPAP-, BiLevel-, and autoadjust machines) are determined by their physical properties. The flow characteristic implies distinct curves leading to expiratory increase and inspiratory decay of pressure depending on flow rate. MATERIAL ANDMETHODS:
For examination of pressure/flow characteristic we examined several valves (one and two circular holes, Sullivan-, Whisper-Swivel-, Silence-valve). Expiratory peak and inspiratory trough assessed at constant pressure (10 mbar) were measured with varying flow rates.RESULTS:
Valves differ with their pressure characteristics up to 1.2 mbar for inspiratory and 1.0 mbar for expiratory flow at 2.0 1/s.CONCLUSION:
The specific characteristic for each valve is part of the total efficiency of a home care ventilator. Their pressure flow relationship has to be taken into account for titration process and for exchange between different machines and accessories.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Mecánica Respiratoria
/
Intercambio Gaseoso Pulmonar
/
Flujo Espiratorio Máximo
/
Respiración con Presión Positiva
/
Servicios de Atención a Domicilio Provisto por Hospital
Límite:
Humans
Idioma:
De
Revista:
Med Klin (Munich)
Año:
1997
Tipo del documento:
Article