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Fundamentos del equilibrio Acido Base

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Fundamentos del equilibrio Acido Base

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Montserrat Carrasco Fernández Clase 6 25/3



Fundamentos del equilibrio ácido-base
Trastornos del equilibrio ácido-base
Son aquellos que afectan el balance ácido-base normal y que causa como consecuencia una
desviación del pH sanguíneo. HCO3 + H2O (plasma sanguíneo) → H + CO2 (elemento de
deshecho). El equilibrio ácido-base del organismo es posible gracias a la interrelación de tres
sistemas:

• Tampones intra y extracelulares, que amortiguan la intensidad de los cambios agudos del
equilibrio ácido-base. Intentan desviar el pH para restituirlo a la normalidad

• La compensación respiratoria, íntimamente relacionada con el sistema anterior. Regula el
sistema de CO2 tras procesos de ácido-base

• La excreción renal del exceso de ácidos. A través de la orina se excreta ácido o se retiene
bicarbonato



VALORES NORMALES EN SANGRE ARTERIAL

• PO2 80 – 100 mmHg

• PH 7.35 – 7.45 → muy bajo es acidosis, y muy alto es una alcalosis, fuera de los limites esta no
compensada, cuando esta en el rango es compensada, y parcialmente compensada es
que . Las alcalosis mixtas no pueden estar descompensada

• PCO2 35 – 45 mmHg → si se ve afectado es respiratoria. Si junto al BIC son afectados es mixto

• BIC 22 - 26 mmHg → si se ve afectado es metabólica



Trastornos Metabólicos

• Acidosis: resulta de una pérdida de
HCO3−, con disminución del pH

• Alcalosis: resulta de una adición o
retención de HCO3−, con elevación
del pH


Trastornos Respiratorios

• Acidosis: resulta de una retención de
CO2, con disminución del pH

• Alcalosis: resulta de una pérdida de
CO2, con elevación del pH

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