![PHARMACOLOGY:
Antihypertensive drugs act centrally (methyldopa, clonidine,
guanabenz), peripherally (prazosin, guanadrel, guanethedine,
hydralazine, minoxidil), centrally and peripherally (beta-adrenergic
blocking drugs) and systemically [angiotensin converting enzyme
(ACE) inhibitors and diuretics]. Centrally-acting antihypertensives
decrease blood pressure by diminishing sympathetic outflow from the
vasomotor centre.
Peripherally-acting antihypertensives act by depleting or inhibiting
the release of catecholamines from the peripheral nerve ending or
altering the response at alpha 1- and alpha 2-receptor sites. Beta-
adrenergic blocking drugs act through a variety of mechanisms by
either decreasing cardiac output, decreasing renin release, inhibiting
prejunctional release of norepinephrine or through central
mechanisms.
Diuretics act as indirect vasodilators by depleting salt and water not
only within the intravascular compartment but within the intramural
portion of the arteriole, thereby diminishing its responsiveness to
catecholamine and angiotensin II stimulation.
ACE inhibitors such as captopril and enalapril act by inhibiting the
conversion of angiotensin I to angiotensin II thereby decreasing the
vasoconstrictor effect of angiotensin II and the aldosterone
production secondary to angiotensin II stimulation. The main](https://image.slidesharecdn.com/diureticsppt1-221016035047-9d641efa/85/DIURETICS-ppt-by-Ms-Aishwarya-Teli-9-320.jpg)
DIURETICS ppt by Ms.Aishwarya Teli
- 1. DEFINITION: A TYPE OF DRUG THAT CAUSES THE KIDNEYS TO MAKE URINE. DIURETICS HELP THE BODY GET RID OF EXTRA FLUID AND SALT. DIURETICS
- 3. Pharmacokinetics: Diuretics may be given orally or by slow intravenous injection or IV infusion. Thiazides are absorbed from the gastrointestinal tract with an onset of action of between one and three hours. They are metabolized in the liver and excreted in urine. PHARMACOLOGICAL ACTION 1.HIGH CEILING/LOOP DIURETICS • High ceiling diuretics may cause a substantial decrease up to 20% of the filtered load of NaCl and water. • Loop diuretics such as FUROSEMIDE inhibit the body's ability to reabsorb sodium at the ascending loop in NEPHRON. 2. THIAZIDES • Thiazide diuretics such as Hydrochlorothiazide act on the distal convoluted tubule and inhibit the sodium chloride symporter leading to retention of water in the urine. • Frequent urination is due to the increased loss of water. • The long term anti -hypertensive action is based on the thiazides which decrease preload and blood pressure. THIAZIDES.
- 4. 3.CARBONIC ANHYDRASE INHIBITORS • Carbonic anhydrase inhibitors inhibits the enzyme carbonic anhydrase which is found in proximal convoluted tubule. • This results in several effects including bicarbonate retention in the urine. • Potassium retention in urine. • Decreased sodium absorption. E.g.: Acetazolamide.,Methazolamine. 4. POTASSIUM-SPARING DIURETICS • These are diuretics which do not promote the secretion of potassium into the urine. ⚫ Potassium is retained and not lost as much as with other diuretics. • The term potassium sparing refers to an effects rather than a mechanism or location. E.g.: Aldosterone antagonists Spironolactone • Which is a competitive antagonist of aldosterone • Aldosterone adds sodium channels in the cells of collecting duct and late distal tubule of the Nephron.
- 5. • Spironolactone prevents aldosterone from entering the cells, and preventing sodium reabsorption. E.g.: Eplerenone, Potassium canrenonate. • Epithelial sodium channel blockers E.g.: Amiloride. Triamterene. 5.OSMOTIC DIURETICS • The compounds as Mannitol are filtered in the glomerulus, but cannot be reabsorbed. Their presence leads to increases in the osmolality of the filtrate. • To maintain osmotic balance, water is retained in the urine. • Glucose like mannitol behaves as an osmotic diuretic. Glycosuria causes a loss of hypotonic water & Na+, leading to a hypertonic state with signs of volume depletion. Such as Hypotension, Tachycardia. 6.LOW CEILING DIURETICS • The low celling diuretics are used to indicate an diuretic has a rapid flatting dose effect curve. • It refers to a pharmacological profile, not a chemical structure.
- 6. MEDICINAL USES Diuretics are used to treat Heart failures Liver cirrhosis. Hypertension. Certain kidney diseases,etc ADVERSE DRUG REACTION: Impotence, skin rashes, nausea, dizziness and lethargy as well as subjective side effects.
- 7. ANTIHYPERTENSIVE DRUG Definition: A type of drug used to treat high blood pressure. There are many different types of antihypertensive agents, and they work in different ways to lower blood pressure. Some remove extra fluid and salt from the body. Others relax and widen the blood vessels or slow the heartbeat.
- 9. PHARMACOLOGY: Antihypertensive drugs act centrally (methyldopa, clonidine, guanabenz), peripherally (prazosin, guanadrel, guanethedine, hydralazine, minoxidil), centrally and peripherally (beta-adrenergic blocking drugs) and systemically [angiotensin converting enzyme (ACE) inhibitors and diuretics]. Centrally-acting antihypertensives decrease blood pressure by diminishing sympathetic outflow from the vasomotor centre. Peripherally-acting antihypertensives act by depleting or inhibiting the release of catecholamines from the peripheral nerve ending or altering the response at alpha 1- and alpha 2-receptor sites. Beta- adrenergic blocking drugs act through a variety of mechanisms by either decreasing cardiac output, decreasing renin release, inhibiting prejunctional release of norepinephrine or through central mechanisms. Diuretics act as indirect vasodilators by depleting salt and water not only within the intravascular compartment but within the intramural portion of the arteriole, thereby diminishing its responsiveness to catecholamine and angiotensin II stimulation. ACE inhibitors such as captopril and enalapril act by inhibiting the conversion of angiotensin I to angiotensin II thereby decreasing the vasoconstrictor effect of angiotensin II and the aldosterone production secondary to angiotensin II stimulation. The main
- 10. USES: Thiazides diuretics • Isolated systolic hypertension (elderly) • Heart failure • Hypertension in blacks Beta-blockers • Angina pectoris • Post-myocardial infarction • Heart failure • Tachyarrhythmias • Glaucoma Pregnancy Calcium antagonists (dihydropyridines) • Isolated systolic hypertension (elderly) • Angina pectoris • LV hypertrophy • Carotid/Coronary Atherosclerosis • Pregnancy • Hypertension in blacks Diuretics (antialdosterone) • Heart failure • Post-myocardial infarction
- 11. ANTI-ISCHAEMIC DRUG DEFINITION: Anti-ischemic drugs decrease myocardial oxygen consumption (by lowering heart rate, blood pressure, myocardial contractility or ventricular preload) and/or increase myocardial oxygen supply (by coronary vasodilatation). CLASSIFICATION ANTI ISCHEMIC DRUGS INCLUDES: 1. Nitrates. 2. Beta-adrenergic blockers. 3. Calcium antagonists. 4. Anti-platelet drugs. PHARMACOLOGY: Anti-ischaemic drugs decrease myocardial oxygen consumption (by lowering heart rate, blood pressure, myocardial contractility or ventricular preload) and/or increase myocardial oxygen supply (by coronary vasodilatation).
- 12. 𝛃-Adrenoceptor blockers: evidence for use of β-blockers in NSTE-ACS is limited, but they are prescribed routinely to relieve ischaemia. Contraindications include airways disease, acute heart failure and impaired cardiac conduction. Calcium channel blockers: small randomized trials suggest that calcium channel blockers relieve symptoms in patients with NSTE-ACS. Calcium channel blockers include dihydropyridines (e.g. amlodipine), diltiazem (a benzothiazepine) and verapamil (a phenylalkylamine). Dihydropyridines cause reflex tachycardia, but diltiazem and verapamil depress cardiac contractility and conduction and should not be given to patients with heart block or in combination with a β-adrenoceptor blocker. Nitrates: small observational studies suggest that intravenous nitrate relieves ischemia in patients with NSTE-ACS. Adverse effects include headache and hypotension; continuous administration can induce tolerance. Nitrates are contraindicated after recent use of phosphodiesterase type 5 inhibitors (e.g. sildenafil).
- 13. USES: Anti-ischemic drugs decrease myocardial oxygen consumption (by lowering heart rate, blood pressure, myocardial contractility or ventricular preload) and/or increase myocardial oxygen supply (by coronary vasodilatation). ADR: Combination Therapy Trimetazidine Ivabradine Ranolazine.Drug Therapy. Calcium Channel Blocking Agent Ischemia Beta Adrenergic Receptor Blocking Agent.