
High ceiling loop diuretics
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High ceiling loop diuretics
High ceiling diuretics are diuretics that may cause a substantial diuresis - up to 20% of the filtered load of NaCl and water. This is huge when compared to normal renal sodium reabsorption which leaves only ~0.4% of filtered sodium in the urine.
Loop diuretics have this ability, and are therefore often synonymous with high ceiling diuretics. Loop diuretics, such as furosemide, inhibit the body's ability to reabsorb sodium at the ascending loop in the kidney which leads to a retention of water in the urine as water normally follows sodium back into the extracellular fluid (ECF). Other examples of high ceiling loop diuretics include ethacrynic acid, torsemide and bumetanide.
Thiazides
Drugs such as hydrochlorothiazide act on the distal convoluted tubule and inhibit the Sodium-chloride symporter leading to a retention of water in the urine as water normally follows penetrating solutes.
Potassium-sparing diuretics
These are diuretics which do not promote the secretion of potassium into the urine; thus, potassium is spared and not lost as much as in other diuretics. The term "potassium-sparing" refers to an effect rather than a mechanism or location; nonetheless, the term almost always refers to two specific classes that have their effect at similar locations:
- Aldosterone antagonists: Spironolactone, which is a competitive antagonist of aldosterone. Aldosterone normally adds sodium channels in the principal cells of the collecting duct and late distal tubule of the nephron. Spironolactone prevents aldosterone from entering the principal cells, preventing sodium reabsorption. A similar agent is potassium canreonate.
- Epithelial sodium channel blockers: amiloride and triamterene.
Calcium-sparing diuretics
The term "calcium-sparing diuretic" is sometimes used to identify agents that result in a relatively low rate of excretion of calcium.
The reduced concentration of calcium in the urine can lead to an increased rate of calcium in serum. The sparing effect on calcium can be beneficial in hypocalcemia, or unwanted in hypercalcemia.
The thiazides and potassium-sparing diuretics are considered to be calcium-sparing diuretics.
- The thiazides cause a net decrease in calcium lost in urine.
- The potassium-sparing diuretics cause a net increase in calcium lost in urine, but the increase is much smaller than the increase associated with other diuretic classes.
By contrast, loop diuretics promote a significant increase calcium excretion. This can increase risk of reduced bone density.



























