Metabolic Acidosis Causes

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4.2 Respiratory Acidosis - Causes

Acid-Base Physiology The arterial pCO2 is normally maintained at a level of about 40 mmHg by a balance between production of CO2 by the body and its removal by alveolar ventilation. If the inspired gas contains no CO2 then this relationship can be expressed by: paCO2 is proportional to VCO2 / VA where: VCO2 is CO2 production by the body VA is Alveolar ventilation An increase in arterial pCO2 can occur by one of three possible mechanisms: Presence of excess CO2 in the inspired gas Decreased alveolar ventilation Increased production of CO2 by the body CO2 gas can be added to the inspired gas or it may be present because of rebreathing : Anaesthetists are familiar with both these mechanisms. In these situations, hypercapnia can be induced even in the presence of normal alveolar ventilation and normal carbon dioxide production by the body. An adult at rest produces about 200mls of CO2 per minute: this is excreted via the lungs and the arterial pCO2 remains constant. An increased production of CO2 would lead to a respiratory acidosis if ventilation remained constant. The system controlling arterial pCO2 is very efficient (ie rapid and effective) and any increase in pCO2 very promptly re Continue reading >>

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  1. cds2011

    How do you pronounce keto/ketosis?

    Is it key-toe or keh-toe?

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  3. Cuhh

    well seeing as the word comes from something to do with ketones (key-tones) i say key-toe.

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