Miller Anestesia

debido a su presencia. Un espirómetro de aspas rotativo puede

reducir el flujo de gas a tasas de flujo altas debido a la fricción

interna. Existen varios métodos para medir la velocidad del fluido

o el flujo que dependen de una medida de presión (el tubo de Pitot,

el tubo de Venturi, el medidor del flujo del orificio); por tanto, la

medida del flujo no es más exacta que la medida de la presión.

Conclusión

Se están desarrollando nuevos monitores casi continuamente, pero

en raras ocasiones se descubren nuevos principios físicos. La física

es un esfuerzo constante para comprender, simplificar y predecir

la conducta del universo en términos cuantitativos. En los capítulos

siguientes se hará referencia varias veces a los términos y principios

que se han analizado aquí.

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Principios fundamentales de los instrumentos de monitorización

987

Sección III

Control de la anestesia

Figura 28-37

Espirómetro de aspas. Los gases en movimiento contienen

energía cinética. Esto puede demostrarse por un «molino de viento» girando

en la corriente de aire.

(Adaptada de Ehrenwerth J, Eisenkraft J:

Anesthesia

Equipment: Principles and Applications

. St. Louis, Mosby-Year Book, 1993.)