Disorders of potassium homeostasis
Hypokalaemia—enhanced discussion of (1) association with hypomagnesaemia and treatment in this circumstance; (2) investigative approach, with use of the urinary potassium to creatinine ratio or calculation of the transtubular potassium concentration gradient (TTKG) to differentiate renal and non-renal causes; (3) channelopathies as the basis for at least some cases of thyrotoxic periodic paralysis.
Hyperkalaemia—only minor changes to this section of the chapter required and made.
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