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Urinary Drugs 411
Urinary
| Question | Answer |
|---|---|
| 60-70% salt/water reabsorbed | Proximal tubule |
| Very low Na permeability | Descending loop of Henle |
| High Na permeability, 20-25% Na reabsorbed | Ascending loop of Henle |
| 5-10% Na reabsorbed, depends on aldosterone | Distal Convoluted Tubule |
| Water reabsorbed if ADH present | Collecting Duct |
| Prevents reabsorption of bicarbonate. Increases osmotic pressure. Cause osmotic diuresis. | Acetazolamide |
| Used primarily to produce alkaline urine | Acetazolamide |
| Diuretic effects loss with chronic use | Acetazolamide |
| Not as effective as diuretics that prevent Na reabsorption | Acetazolamide |
| Inhibit Na reabsorption at distal convoluted tubule | Thiazide Diuretics |
| Moderate potency, can only affect 10% of Na load | Thiazides |
| Used short term for mild edema | Thiazides |
| Loses diuretic effect after about 1-2 weeks, antihypertensive effect remains chronically | Thiazides |
| Thiazide Diuretics Drugs | Chlorothiazide, HCTZ, Metolazone, Indapamide |
| Arrhythmias, orthostatic hypotension, muscle weakness/cramps/pain | Consequences of Thiazide-induced hypokalemia |
| Thiazides ADRs | hypokalemia, hyperuricemia, hyperglycemia, hypercholesterolemia |
| Most effective agents, infinite dose response | Loop Diuretics |
| For moderate to severe edema | Loop Diuretics |
| Disease states where thiazides must be used w/ caution | severe renal impairment, DM, electrolyte imbalances, pregnant, elderly, gout |
| Loop Diuretics Drugs | Bumetanide, Ethacrynic acid, Furosemide |
| Loop Diuretics ADRs | Hypokalemia, hypomagnesemia, hyperuricemia, hypercholesterolemia, hypovolemia, ototoxicity |
| Consequences of Thiazide-induced hypokalemia | Arrhythmias, orthostatic hypotension, muscle weakness/cramps/pain |
| hypokalemia, hyperuricemia, hyperglycemia, hypercholesterolemia | Thiazides ADRs |
| Hypokalemia, hypomagnesemia, hyperuricemia, hypercholesterolemia, hypovolemia, ototoxicity | Loop Diuretics ADRs |
| K+ sparing diuretics drugs | Amiloride, Spironolactone, Triamterene |
| Mild diuretics, usually used w/ other diuretics | K+ sparing diuretics |
| K+ induced hyperkalemia risk groups | renal impairment, DM, elderly |
| Signs and symptoms of hyperkalemia | Parasthesias, muscular weakness flaccid paralysis of extremeties, bradycardia, shock, ECG abnormalities |
| Parasthesias, muscular weakness flaccid paralysis of extremeties, bradycardia, shock, ECG abnormalities | Signs and symptoms of hyperkalemia |
| Consequences of Thiazide-induced hypokalemia | Arrhythmias, orthostatic hypotension, muscle weakness/cramps/pain |
| Antagonizes the effects of aldosterone, diuretic activity only in presence of aldosterone | Spironolactone |
| Used in combo w/ HCTZ to prevent HCTZ induced hypokalemia | Spironolactone |
| Causes hirsutism, endocrine problems | Spironolactone |
| Increase intravascular osmotic pressure. Keep water and Na in tubule | Osmotic Diuretics |
| Acetazolamide | Proximal tubule diuretic |
| Chlorothiazide | Thiazide Diuretic (distal conv. tubule) |
| Hydrochlorothiazide (HCTZ) | Thiazide Diuretic (distal conv. tubule) |
| Indapamide | Thiazide Diuretic (distal conv. tubule) |
| Amiloride | K+ sparing diuretic |
| Spironolactone | K+ sparing diuretic |
| Triamterene | K+ sparing diuretic |
| Bumetanide | Loop Diuretic |
| Ethacrynic acid | Loop Diuretic |
| Furosemide | Loop Diuretic |
| Mannitol-IV | Osmotic Diuretic |
| Urea-IV | Osmotic Diuretic |
| Glycerin-PO | Osmotic Diuretic |