ABG: morbid obesity and vomiting

Generic Clinical Sciences, Physiology - Renal/Urine/Electrolytes

Morbid obesity is associated with OSA, and the concern would be development of respiratory acidosis from hypoventilation. However, vomiting causes a metabolic alkalosis, so the result is a mixed respiratory acidosis with superimposed metabolic alkalosis. The danger is that the alkalemia will reduce the acidemic stimulus to breathe, worsening the pulmonary insufficiency.


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