Категории: Все - renal - inhibitors - diuretics

по Felicia MedStudent 16 лет назад

423

Lowering BP

Certain medications are essential for managing blood pressure and associated conditions. These include mineralocorticoid receptor antagonists like spironolactone and eplerenone, which differ in specificity and receptor binding profiles.

Lowering BP

Lowering Blood Pressure

also std of care for diabetic nehpropathy

reduce AT II action
ARB's (AT Receptor Blockers)

Valsartan

MOA: blocks binding of AT II to AT-1 receptors (same as losartan K)

food markedly decreases absorbtion

Diovan HCT

Losartan Potassium

MOA: blocks binding of AT II to AT-1 receptors

*more efficacious in reducing the action of AT II

actions:



  • inhib contraction of vascular smooth muscle
  • decr catecholamine release
  • decr aldosterone biosynthesis
  • decr thirst
  • decr ADH
  • decr AT II mediated changes in renal fxn (ie decr Na retention)
  • decr cellular hypertrophy and hyperplasia
  • available in combo with HCTZ

    Hyzaar

    NO COUGH!

    dizziness

    decrease AT II production
    PDP/ACE Inhibitors

    Use for:

  • HTN (decr vasoconstriction)
  • - esp diabetic nephropathy <--ACE or ARB

  • CHF (incr vasodilation)<-- ACE are DoC
  • Post MI <-- ACE are DoC
  • anginal pain, ischemic events

  • all are renal sparing, so they do not increase transglomerular pressure

    Lisinopril

    advantages

    Enalapril

    MOA: same as captopril

    advantages:

    bioavailability not affected by food

    qd dosing

    IV admin

    No sulfhydryl group so fewer AEs

    has carboxyl group instead

    AE

    no hypogustia

    Captopril

    MOA: blocks conversion of AT I -> AT II and increases activity of bradykinin (which breaks down vasodilators to inactive peptides)

    (1) decreases production of vasoconstrictors (AT II)

    (2) decreases destruction of vasodilators (bradykinin)



  • oral
  • has sulfhydrl group
  • renal-sparing (doesn't increase transglomerular pressure)
  • will effectively decrease both AT 1 & AT 2 receptor activity
  • food reduces bioavailabilty by 25%
  • renal sparing

    does not increase transglomerular pressure

    which would lead to glomerular damage

    drug interactions

    w/ triamterene or amiloride

    AE:

    increased renin and AT I production

    hypoglycemia

    rash (hypersensitivity)

    neutropenia

    proteinuria

    non-productive cough

    b/c increased bradykinin stimulates the cough reflex

    hypogustia (loss of taste)

    hyperkalemia

  • b/c it reduces aldosterone secretion, so you're not spilling as much K+
  • Mineralocorticoids

    K-sparing diuretics
    Physiologic Antagonists

    Amiloride

    Triamterene

    Competitive Antagonists

    Eplerenone

    much more specific mineralocorticoid antag

    Spironolactone

    binds to mineralocorticoids, androgen, AND progestin receptors

    Agonists

    in combo with glucocorticoids, are used as replacement in adrenal insufficiency

    Deoxycorticosterone acetate (DOCA)

    IV or IM in oil

    Fludrocortisone

    DoC, oral

    Decrease Renin

    decrease renin release
    CNS Adrenolytics

    eg. Clonidine, Methyldopa

    Beta Blockers

    eg, Propranolol

    inhibit renin action
    Aliskiren (Tekturna)

    renin inhibitor