Neonatal lungs--can absolute lung resistivity be determined non-invasively?
Med Biol Eng Comput
; 40(4): 388-94, 2002 Jul.
Article
en En
| MEDLINE
| ID: mdl-12227624
ABSTRACT
The electrical resistivity of lung tissue can be related to the structure and composition of the tissue and also to the air content. Conditions such as pulmonary oedema and emphysema have been shown to change lung resistivity. However, direct access to the lungs to enable resistivity to be measured is very difficult. We have developed a new method of using electrical impedance tomographic (EIT) measurements on a group of 142 normal neonates to determine the absolute resistivity of lung tissue. The methodology involves comparing the measured EIT data with that from a finite difference model of the thorax in which lung tissue resistivity can be changed. A mean value of 5.7 +/- 1.7 omega(m) was found over the frequency range 4 kHz to 813 kHz. This value is lower than that usually given for adult lung tissue but consistent with the literature on the composition of the neonatal lung and with structural modelling.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Recién Nacido
/
Tomografía
/
Pulmón
Límite:
Child, preschool
/
Humans
/
Infant
Idioma:
En
Revista:
Med Biol Eng Comput
Año:
2002
Tipo del documento:
Article
País de afiliación:
Reino Unido