Loop Diuretics

Loop diuretics – also known as high ceiling diuretics or high efficacy diuretics – are drugs which inhibit  Na+ K+ 2Cl- transporters in the thick ascending limb of loop of Henle to increase production of urine. Eg: Frusemide, Bumetanide, Torasemide

Uses of loop diuretics:

  1. Edema due to all etiologies – cardiac, renal, hepatic. 
  2. Left ventricular failure – frusemide is given intravenously which acts as a pulmonary venodilator thus decreasing left ventricle preload, decreases venous return and blood volume by its diuretic action
  3. Cerebral edema – can be combined with osmotic diuretics
  4. Hypertension – indicated in renal insufficiency, congestive heart failure, resistant cases, hypertensive emergencies
  5. Blood transfusion – to prevent fluid overload
  6. Hypercalcemia, renal stones – Frusemide increases calcium excretion

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Frusemide in left ventricular failure

Frusemide is a loop diuretic.  It is also a pulmonary venodilator.  In left ventricular failure, frusemide is given intravenously.  It...