What is the structure activity relationship of thiazide diuretics?
What is the structure activity relationship of thiazide diuretics?
Thiazide diuretics control hypertension in part by inhibiting reabsorption of sodium (Na+) and chloride (Cl−) ions from the distal convoluted tubules in the kidneys by blocking the thiazide-sensitive Na+-Cl− symporter.
What is the mechanism of action for diuretics?
They act by diminishing sodium reabsorption at different sites in the nephron, thereby increasing urinary sodium and water losses. A second class of diuretics, sometimes termed aquaretics, instead inhibit water reabsorption by blocking vasopressin receptors along the connecting tubule and collecting duct.
How do diuretics Work?
Diuretics, sometimes called water pills, help rid your body of salt (sodium) and water. Most of these medicines help your kidneys release more sodium into your urine. The sodium helps remove water from your blood, decreasing the amount of fluid flowing through your veins and arteries.
What do diuretics target?
The main target of loop diuretic is the sodium potassium chloride co-transporter, NKCC2, SLC12A1, which is found predominantly in the thick ascending limb of the loop of Henle (i.e. earlier in the resorption process than the distal convoluted tubule where thiazides act).
Why do loop diuretics cause hypokalemia?
Because loop and thiazide diuretics increase sodium delivery to the distal segment of the distal tubule, this increases potassium loss (potentially causing hypokalemia) because the increase in distal tubular sodium concentration stimulates the aldosterone-sensitive sodium pump to increase sodium reabsorption in …
Where do thiazide diuretics work in the nephron?
Thiazide diuretics work by blocking sodium and chloride (Na/Cl) channels in the distal convoluted tubule of the nephron and inhibit the reabsorption of sodium and water.
Do diuretics inhibit ADH?
Administration of a loop diuretic interferes with this process by impairing the accumulation of sodium chloride in the medulla. Thus, although the loop diuretic can increase ADH levels by inducing volume depletion, responsiveness to ADH is reduced because of the impairment in the medullary gradient [9].
Which part of the filtration process is affected by the diuretic medication?
Your kidneys are the filters through which toxins and excess fluids are flushed from your body. When you take a diuretic medication, the drug signals to your kidneys that you need to get rid of more sodium. Water binds to the sodium and is then removed during urination, leaving you with a lower blood volume.
How do diuretics affect homeostasis of fluid balance?
The use of diuretics leads to a negative sodium and fluid balance without primary effects on serum sodium concentration. This parameter is regulated by the activity of the antidiuretic hormone (ADH) system. Secondary changes in other electrolyte systems and in acid base homeostasis also are induced by diuretic therapy.
What are the indications of diuretics?
Diuretics are indicated for treating:
- Oedema.
- Congestive heart failure.
- Hypertension.
- Renal disease.
- Liver disease.
- Glaucoma.
- Raised intracranial pressure.
Why do diuretics cause metabolic alkalosis?
Loop and thiazide diuretics can cause metabolic alkalosis due to increased excretion of chloride in proportion to bicarbonate. This is more common with loop diuretics than thiazide diuretics.
Why do diuretics cause hyponatremia?
(1) The propensity of thiazides to promote hyponatremia is explained by the inhibition of urinary dilution due to reduced reabsorption of NaCl in the distal renal tubules. In contrast, loop diuretics do not impair urinary dilution and are not associated with reduction of sodium levels.
