QuestionSBA
QuestionChoice
This causes a metabolic acidosis with a raised anion gap. It is unlikely in this case as there is no history which indicates tricyclic antidepressant use.
10001269
d
Tricyclic antidepressant overdose
QuestionChoice
Patients with chronic kidney disease develop a metabolic acidosis with raised anion gap. This occurs because the kidneys are unable to clear acids from the bloodstream.
10001270
e
Chronic kidney disease
QuestionChoice
Vomiting would result in a metabolic alkalosis due to the gastrointestinal loss of H+ ions.
10001267
b
vomiting
QuestionChoice
Diarrhoea would result in a metabolic acidosis with a normal anion gap. This is due to the loss of bicarbonate ions in the stool.
10001268
c
Diarrhoea
QuestionChoice
This ABG shows a respiratory alkalosis which is likely to be secondary to a panic attack. The patient is breathing faster due to her panicked state and is blowing off carbon dioxide, resulting in her low PaCO2 and paraesthesia.
10001266
a
Panic attack
Concept
Chapter
2693
3901
Acid-base concept
Topic
132
Respiratory
12800
A 16-year-old female presents to hospital with complaints of perioral paraesthesia and tingling in her fingers and toes. She admits to episodes of shortness of breath and chest tightness over the last 2 months at school.


An arterial blood gas is done which demonstrates the following:

||||
|--------------|:-------:|------------------|
|pH|7.47|7.35 - 7.45|
|PaO₂|14 kPa|11 - 15|
|PaCO₂|3.9 kPa|4.6 - 6.4|
|Bicarbonate|24 mmol/L|22 - 30|



What is the most likely cause of this patient's presentation?
a