Test2: Wk8: 1 Drugs to treat hypertension - Henderson Flashcards
NonDrug Treatment (4)
Sodium restriction
Weight reduction
Exercise (cardio)
Decrease alcohol consumption
Pharmacological (Drug) Treatment
Usually diuretics and/or Ξ² blockers for initial therapy
Low dose/combinations to reduce adverse effects
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3 Mechanisms of Antihypertensive Drugs
- Decrease TPR
- Decrease CO
- Decrease both
Drugs Used for Treatment of Chronic Essential Hypertension (4)
Diuretics
Inhibitors of the Angiotensin System
Sympatholytic Agents
Vasodilators
Diuretics (3)
Thiazides and related agents
Loop diuretics
Potassium sparing diuretics
Inhibitors of the Angiotensin System (3)
Angiotensin Converting Enzyme Inhibitors (ACEIs)
Angiotensin II Receptor Antagonists
Renin Inhibitors
Sympatholytic Agents (4)
Ξ² Blockers
Centrally acting Ξ± 2 agonists
Ξ± 1 Blockers
Adrenergic neuronal blocking agents
Vasodilators (3)
Ca 2+ channel blockers
K Channel activators
Guanylate cyclase activators
Thiazide and related diuretics Decrease mortality in
Decrease mortality in hypertension
What is Recommended for initial therapy
Thiazide and related diuretics
What is Recommended for isolated systolic hypertension in elderly
Thiazide and related diuretics
Thiazide and related diuretics: Mechanism Acute
Decrease plasma volume β‘ decrease CO β‘ decrease BP
Thiazide and related diuretics: Mechanism Chronic
Decrease TPR β‘ decrease BP
Thiazide and related diuretics: Adverse Affects
Hypokalemia
Sexual dysfunction
Hyperuricemia
Hyperglycemia
Thiazide and related diuretics: Drug Interactions (4)
Digoxin (hypokalemia)
Quinidine (hypokalemia)
NSAIDS (inhibit antihypertensive effect)
Antidiabetics (hyperglycemia)
Loop Diuretics Used as antihypertensive diuretic when GFR β
<30 ml/min
Loop Diuretics Used to combat
massive fluid retention induced by vasodilators
Loop Diuretics More effective than β as diuretics
thiazides as diuretics
Loop Diuretics Less effective than β as antihypertensives
thiazides
Potassium sparing Diuretics Used as
adjunctive drugs with thiazides and loop diuretics
Potassium sparing Diuretics Reduce/prevent hypokalemia induced by β and β
thiazide and loop diuretics
Potassium sparing Diuretic Adverse effects:
hyperkalemia
Potassium sparing Diuretic Spironolactone is a
Aldosterone Antagonist
Potassium sparing Spironolactone treats
Treat hypertension for primary hyperaldosteronism
Inhibitors of Renin Angiotensin System Mechanism cardiac effects
Decrease TPR, CO, and BP
ACE Inhibitors Used for (3)
diabetes
CHF
Post MI with systolic dysfuntion
ACE inhibitors drugs
Enalapril, lisinopril, benazepril, captopril, fosinopril
ACE Inhibitors Adverse Effects (6)
Renal Failure Fetopathic potential ( avoid in pregnancy Cough Hyperkalemia Rash Neutropenia
Angiotensin II Receptor Blockers (ARBs) Drugs
Losartan, Valsartan, Eprosartan
When to use ARBs
Use where ACE inhibitors are indicated but not tolerated
Avoid ARBs in
Avoid in pregnancy and renovascular disease
ARBs Adverse Effects
similar to ACE Inhibitors but less cough
Renin Inhibitors drugs
Aliskiren
Aliskiren MOA
Inhibit renin β‘ decreases angiotensin I
Aliskiren Effects
Similar to ACEIs with less cough
Aliskiren uses
Hypertension
Aliskiren contraindications
Similar to ACEIs
Beta blockers decrease mortality in
hypertension
β are recommended for initial therapy provided no contraindications exist
beta blockers
Beta Blockers indications
post MI
CHF
Beta Blockers Mechanisms
Beta1 receptor blockade
Beta Blockers effects
decrease CO
decrease Renin secretion
Beta blocker adverse effects come from actions on β receptors
Beta2
Ξ² Blockers: Adverse Effects (9)
- Bronchospasm
- Decrease myocardial contractility
- Decrease AV conduction
- Decrease HDL, Increase triglycerides
- insulin induced hypoglycemia
- Cold extremities
- Psychic depression
- Fatigue
- Sexual dysfunction
Cardioselective Ξ² blockers (for diabetes)
Atenolol
Ξ² blockers with Ξ± 1 blocking activity (for hyperlipidemia)
carvedilol and Labetolol
Ξ² Blockers: Drug Interactions
NSAIDs
Digoxin
Verapamil, diltiazem
Centrally acting Ξ± 2 Agonists no recommended for initial therapy except
during pregnancy
Centrally acting Ξ± 2 Agonists Mechanism
Ξ± 2 receptor activation in CNS decreases sympathetic outflow
Centrally acting Ξ± 2 Agonists effects
Decreases TPR and renin secretion
Centrally acting Ξ± 2 Agonists drugs
Methyldopa, Clonidine
Methyldopa MOA
Metabolized intraneuronally to Ξ± methyl NE ( Ξ± 2 agonist)
Methyldopa uses
Treatment of hypertension during pregnancy
Methyldopa adverse effects (6)
Sedation Dry mouth Positive Coombs test Hepatitis Rebound hypertension upon withdrawal Sexual dysfunction
Clonidine Adverse effects and toxicities: (4)
Sedation
Dry mouth
Rebound hypertension upon withdrawal
Sexual Dysfunction
Ξ± 1 Receptor Antagonists
Prazosin
Prozosin Recommendation
not for initial therapy
Prazosin is often not
effective chronically as monotherapy
Prazosin has a favorable effect in
hyperlipidemia
Prazosin MOA
Block alpha 1 receptors in vasculature to decrease TPR
Prazosin Adverse effects and toxicities
1st dose orthostatic hypotension
sexual dysfunction
Adrenergic Neuronal Blocking Agents Reserpine recommendation
not for initial therapy
Adrenergic Neuronal Blocking Agents Reserpine mechanism and cardiac effects
deplete NE from adrenergic nerves
Decrease TPR, HR, CO and BP
Reserpine adverse effects and toxicities (3)
antiadrenergic effects
psychic depression
GI
Vasodilators mechanism
arteriodilation - Decrease TPR
venodilation - decrease CO
Ca2+ Channel Blockers more effective in β than β or β
African Americans than ACEIs and Beta blockers
Ca2+ Channel Blockers cardiac effects
decrease TPR
varying effects on CO
Ca Channel Blockers Adverse Effects (4)
increase mortality
hypotension
decreased mycardial contractility
Decreased AV contraction
avoid verapamil, diltiazem in CHF with
Ca channel blockers
K Channel Openers mechanism
efflux of K ++β hyperpolarization β relaxation β decrease TPR
k Channel Openers - Drugs
Minoxidil
Minoxidil is used for
treatment of severe refractory hypertension
K Channel Openers Adverse effects (3)
marked fluid retention
tachycardia
hypertrichosis
Guanylate Cyclase Activators mechanism cardiac effects
decrease TPR and BP
Guanylate Cyclase Activators drug
Hydralazine
Hydralazine used as therapy in
pregnancies with preeclampsia
Hydralazine adverse effects (3)
lupus like syndrome
fluid retention
tachycardia