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Diuretics in patients with chronic kidney disease.

Diuretic drugs act on electrolyte transporters in the kidney to induce diuresis and are often used in chronic kidney disease (CKD), given that nephron loss creates a deficit in the ability to excrete dietary sodium, which promotes an increase in plasma volume. This rise in plasma volume is exacerbated by CKD-induced systemic and intra-renal activation of the renin-angiotensin-aldosterone-system, which further limits urinary sodium excretion. In the absence of a compensatory decrease in systemic vascular resistance, increases in plasma volume induced by sodium retention can manifest as a rise in systemic arterial blood pressure. Management of sodium and volume overload in patients with CKD is therefore typically based on restriction of dietary sodium intake and the use of diuretic agents to enhance urinary sodium excretion. Thiazide and thiazide-type diuretics are foundational therapies for the management of hypertension, whereas loop diuretics are often needed for volume overload, which might also require combination therapies. Mineralocorticoid receptor antagonists have an important role in the management of diuretic-resistant volume overload or treatment-resistant hypertension. Additionally, diuretics can be used for the diagnosis of kidney diseases and in the management of hyperkalaemia or hypokalaemia, hyponatraemia, hypercalcaemia and hypomagnesaemia.

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