SAQ 1716 – Neonatal vomiting with venous blood gas

Marked out of 12.00

A 3-week-old boy is brought to the ED with vomiting.

List four differential diagnoses. For each, state a cardinal historical feature that would support the diagnosis.

(Marked out of 8.0)


/ 8

A venous blood gas is shown below. State three abnormalities and include the cause of each.

(Marked out of 3.0)

Test Result Reference range
pH 7.618 7.35-7.45
pCO2 55 mmHg 35-45
pO2 30 mmHg
HCO3 56 mmol/L 21-28
Na 136 mmol/L 134-146
K 3.0 mmol/L 3.4-5.0
Cl 72 mmol/L 98-108


/ 3

State the most likely diagnosis.

(Marked out of 1.0)


/ 1

Total Score: 0 / 12

Percentage: 0%