SAQ 173 – Respiratory – mixed alkalosis and raised A-a gradient

Review Completed

Marked out of 11.00

A 74-year-old man presents with one week of dyspnoea and chest pain. HR is 110/min, temperature 38 C, and arterial blood gas and biochemistry results are shown below.

Test	Result	Reference range
FiO2	0.5
pH	7.62	7.35-7.45
pCO2	28.5 mmHg	35-45
pO2	234 mmHg	80-95
Bicarbonate	30.0 mmol/L	22-28
Base excess	8.3	-3 to +3
O2 saturation	99.8%	>95
Lactate	1.1 mmol/L	<1.3
Sodium	131 mmol/L	134-146
Potassium	2.0 mmol/L	3.4-5
Chloride	90 mmol/L	98-106
Glucose	12.7 mmol/L	3.5-5.5

Provide two (2) calculations that assist interpretation and state the significance of each.

(Marked out of 4.0)

/ 4

Using the scenario and derived values, state two (2) primary acid-base abnormalities.

(Marked out of 2.0)

/ 2

List five (5) likely unifying causes for these pathological findings.

(Marked out of 5.0)

/ 5

Total Score: 0 / 11

Percentage: 0%

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