Effect of a nonrebreathing exhalation valve on long-term nasal ventilation using a bilevel device.
Chest
; 122(1): 84-91, 2002 Jul.
Article
em En
| MEDLINE
| ID: mdl-12114342
ABSTRACT
STUDY OBJECTIVE:
To determine whether an exhalation valve designed to minimize rebreathing improves daytime or nocturnal gas exchange or improves symptoms compared with a traditional valve during nocturnal nasal ventilation delivered using a bilevel pressure ventilation device.DESIGN:
Prospective direct comparison trial with each patient sequentially using both valves, during a 2-week run-in period with a traditional valve, a 2-week trial with the nonrebreathing valve, and a 2-week washout period with the traditional valve.SETTING:
Outpatient pulmonary function laboratory and home nocturnal monitoring. PATIENTS Seven patients who received long-term (> 1 year) nocturnal nasal bilevel pressure ventilation with an expiratory pressure ofRESULTS:
Seven patients with a variety of neuromuscular, chest wall, and obstructive defects were enrolled. No mean differences in daytime arterial blood gas levels, pulmonary functions, nocturnal vital signs or oximetry, or PtcCO(2) were apparent regardless of the exhalation valve used. The multichannel recording was indicative of an air leak at least one third of the time, and the PetCO(2) tracing detected a blunted signal or no signal from the mask during the majority of the recording time.CONCLUSION:
The use of an exhalation valve designed to minimize rebreathing did not improve daytime or nocturnal gas exchange or symptoms in patients receiving long-term nasal bilevel pressure ventilation in comparison with a traditional exhalation valve, most likely because of air leakage and escape of CO(2) via other routes.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Respiração Artificial
/
Apneia Obstrutiva do Sono
/
Doença Pulmonar Obstrutiva Crônica
/
Distrofias Musculares
Limite:
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Chest
Ano de publicação:
2002
Tipo de documento:
Article
País de afiliação:
Estados Unidos