QuestionSBA
QuestionChoice
Although there is respiratory involvement, the patient's pH is above the normal range, and thus he is alkalotic, not acidotic.
10004827
b
Respiratory acidosis
QuestionChoice
Although the patient is alkalotic, signified by his pH which is above the normal range. Metabolic involvement is unlikely as his HCO3 levels are within normal range. His CO2 levels are below the normal range, making this a respiratory alkalosis.
10004829
d
Metabolic alkalosis
QuestionChoice
In mixed respiratory and metabolic acidosis, you would see the involvement of both respiratory and metabolic systems. As his pH is above the normal range, acidosis can be ruled out immediately as he is alkalotic.
10004830
e
Mixed respiratory and metabolic acidosis
QuestionChoice
The patient is alkalotic, not acidotic as his pH is above the normal range. Additionally, metabolic involvement is unlikely as his HCO3 levels are within normal range.
10004828
c
Metabolic acidosis
QuestionChoice
The patient's pH is above the normal range and therefore he is alkalotic. Upon establishing this, the following step in ABG interpretation is to establish if this alkalosis is due to a respiratory or metabolic involvement. As PaCO2 levels are below the normal range, this is consistent with respiratory involvement. As HCO3 levels are within normal range we can rule out a mixed metabolic and respiratory alkalosis. Therefore this patient has respiratory alkalosis.
10004826
a
Respiratory Alkalosis
Concept
Chapter
2693
4338
Respiratory alkalosis
Topic
132
Respiratory
13512
A 24-year-old man presents to the emergency department following an anxiety attack during which he hyperventilated.


If an ABG were to be performed, the following values would be obtained.



||||
|--------------|:-------:|------------------|
|pH|7.49|7.35 - 7.45|
|PaO₂|15 kPa|11 - 15|
|PaCO₂|3.5 kPa|4.6 - 6.4|
|Bicarbonate|23 mmol/L|22 - 30|


Which of the following options is the most likely explanation for this patient's ABG results?
a