Syllabus · Current · V5 (2025) · Body Fluids and Electrolytes

F1 · Physiology of Body Fluids and Electrolytes

F1.v · Electrolyte Regulation

Official V5 objective
Describe the distribution, regulation and physiological importance of the following ions; a. calcium, b. chloride, c. magnesium, d. potassium, e. phosphate, f. sodium.
11 SAQ topics 20 SAQ appearances 22 VIVA stations

Written examination

SAQ history

20 appearances
Calcium Regulation
4 exam appearances
a) Outline the distribution of calcium in the body and provide the normal range of plasma calcium concentration (20% of marks). b) Outline the regulation of plasma calcium (50% of marks). c) Outline other physiological factors that may influence plasma calcium concentration (30% of marks).
74.7%
Describe the regulation of plasma calcium concentration.
51%
Outline the distribution of calcium in normal plasma (20% of marks). Describe the hormonal control of the calcium concentration in the plasma (80% of marks)
53%
Outline the regulation of plasma calcium concentration. Outline the mechanism of action of biphosphonates for the management of hypercalcaemia.
33%
Electrolytes — Calcium
1 exam appearance
Outline the role of calcium in the body (70% of marks). Outline the differences between calcium chloride and calcium gluconate solutions (30% of marks).
33%
Describe the electrocardiographic (ECG) changes seen with hyperkalaemia. (30% of marks) Outline the pharmacologic principles of drugs used in the management of severe hyperkalemia. (70% of marks)
Describe the mechanism of actions and duration of effect of drugs used to lower potassium in hyperkalaemia.
55%
Electrolytes — Magnesium
2 exam appearances
Outline the distribution, clearance and physiologic functions of magnesium in the body.
36%
Outline the distribution, clearance and physiologic functions of magnesium in the body
20%
Electrolytes — Phosphate
1 exam appearance
Outline the distribution, absorption, elimination, regulation and physiological role of phosphate.
29%
Describe the determinants of serum potassium. Outline the consequences of acute hyperkalaemia.
43%
Describe the factors that affect the flux of potassium across the cell membrane
0%
Describe the physiological role, distribution and regulation of potassium ions (K+ ).
51%
Describe the physiological role, distribution and regulation of potassium (K+)
Describe renal handling of potassium (60% of Marks), including physiological factors that may influence it (40% of Marks).
33%
Describe renal handling of potassium (60% marks), including factors that may influence it (40% marks).
33%
Discuss the regulation of body potassium by the kidney.
27%
Describe the renal handling of sodium.
46%
Describe the regulation of sodium in the body.
19%
Describe how the kidney handles sodium. (50 marks) What factors influence urinary sodium excretion (50 marks)
22%

Oral examination

VIVA history

22 stations

Sources: objective text from the relevant CICM syllabus; historical SAQ and VIVA wording from CICM examiner reports.