SAQ 1387 – Infant vomiting with venous blood gas and dehydration

Marked out of 10.00

A 5-week-old boy is brought to ED with vomiting and lethargy. His venous blood gas is shown.

Result Value Reference range
pH 7.60 7.35-7.45
pCO2 55 mmHg 35-45
pO2 44 mmHg
HCO3 51 mmol/L 20-28
BE 14 mmol/L -3 to +3
Na 138 mmol/L 135-145
K 4.0 mmol/L 3.5-4.5
Cl 69 mmol/L 88-108
Gluc 4.1 mmol/L 3.0-5.5
Lact 3.3 mmol/L <2.0

List the acid-base abnormalities, including calculations where relevant.

(Marked out of 5.0)


/ 5

State the most likely diagnosis and how you would confirm it on investigation.

(Marked out of 2.0)


/ 2

You estimate 10% dehydration and he weighs 5 kg. State three important aspects of fluid management.

(Marked out of 3.0)


/ 3

Total Score: 0 / 10

Percentage: 0%