Electrolytes Flashcards
1
Q
Causes of low Mg
A
- Drugs - diuretics and PPIs
- TPN
- Diarrhoea (acute or chronic)
- OH
- Hypokalaemia
- Hypercalcaemia
- Metabolic disorders
2
Q
What drugs cause low Mg
A
Diuretics and PPIs
3
Q
Why does hypercalcaemia cause low Mg
A
Ca and Mg functionally compete for transport in the thick ascending loop of Henle
4
Q
Features of low Mg
A
(Sim to hypocalcaemia)
- Paraesthesia
- Tetany
- Seizures
- Arrhythmia’s
- Decreased PTH secretion -> hypocalcaemia
- ECG features similar to hypokalaemia
- exacerbates digoxin toxicity
5
Q
Treatment of low Mg
A
Split into < and > 0.4mmol/L
>0.4: = Oral mg salts
<0.4 = IV mg
6
Q
What is a SE of giving oral mg salts
A
Diarrhoea
7
Q
What does Furosemide do electrolytes (Loop diuretic)
A
Hyponatraemia, hypokalaemia and hypomagnesia
