Electrolyte Imbalance Flashcards
Causes of hyperkalaemia (7)
Renal failure
Drug (ACEi, trimethoprim, K-sparring diuretics, NSAIDs, BB)
Tissue breakdown (rhabdo, haemolytic, tumour lysis)
Metabolic eg DKA
Endocrine: Addisons
Diet
Spurious
Symptoms of hyperkalaemia
Weakness progressing to flaccid paralysis
Decreased reflexes
Paraesthesia
ECG changes in hyperkalaemia
1st degree HB
Flattened/absent p waves
Widened QRS
Tall tented t waves
ST depression
S and T merging (sine wave)
VT
Bradycardia
Risks of hyperkalaemia treatment
Hypoglycaemia
Tissue breakdown due to calcium
Rebound hyperkalaemia
Causes of hypokalaemia (6)
GI losses
Drugs (diuretics, laxatives, steroids)
Renal loss (renal tubular disorders, diabetes insipidus , dialysis)
Endocrine (Cushings, hyperaldosteronism)
Metabolic alkalosis
Magnesium depletion
Symptoms hypokalaemia
Fatigue, weakness, leg cramps, constipation
If severe: rhabdo, paralysis, resp difficulties
ECG features hypokalaemia
U waves
T flattening
ST changes
Arrhythmias
Causes hypercalcaemia
Hyperparathyroid
Malignancy
Sarcoidosis
Drugs
Symptoms hypercalcaemia
Confusion, weakness, abdo pain, hypotension, arrhythmia
ECG features hypercalcaemia
Short QT
Wide QRS
Flat T waves
AV block
Treatment hypercalcaemia
Fluid replacement
Furosemide
Hydrocortisone
Pamidronate
Causes hypocalcaemia
Renal failure
Pancreatitis
CCB overdose
Toxic shock
Rhabdo
Tumour lysis
Symptoms hypocalcaemia
Paraesthesia
Tetany
Seizures
AV block
ECG features hypokalaemia
Long QT
TWI
Heart block
Treatment hypocalcaemia
Calcium
Magnesium