An old lady with sepsis and an acid-base disturbance

Last update: Thursday, 26 May 2016 at 07:24

A 69 year-old woman was admitted to the intensive care unit (ICU) with sepsis secondary to a urinary tract infection. She had a pulse oximetry of 92% while breathing room air and her respiratory rate was 23 bpm.

An arterial blood gas analysis was collected and the results are shown below:

Quiz52.1

Source: www.xlung.net

1) What acid-base disturbance is present?

a) Pure metabolic acidosis
b) Respiratory alkalosis and metabolic acidosis

2) What is the explanation for a relatively low SaO2 considering the PaO2 is very close to the normal range for her age?



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