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|2. Acute Respiratory Alkalosis.
A middle aged man weighing 75 kg is anesthetized in preparation for a craniotomy. The ventilator is set to an exhaled tidal volume of 700 ml and a rate of 12 breaths per minute. As a result of this hyperventilation the PCO2 has fallen to 28 mmHg (pure respiratory alkalosis) but there has been no time for any metabolic compensation to develop.
The diagram shows the position of the principal zones. These zones are based on the review of the literature described by Schlichtig, Grogono, and Severinghaus. The arrows indicate typical acidosis and alkalosis. The labels in the black circles correspond to the legend in the table below.
|AR||Acute Respiratory Acidosis:||SBE = 0|
|CR||Chronic Respiratory Acidosis:||SBE = 0.4 x PCO2|
|M||Metabolic Acidosis:||PCO2 = 1.0 x SBE|
|AR||Acute Respiratory Alkalosis:||SBE = 0|
|CR||Chronic Respiratory Alkalosis:||SBE = 0.4 x PCO2|
|M||Metabolic Alkalosis:||PCO2 = 0.6 x SBE|
Alan W. Grogono
|Copyright Oct 2016.|
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