HTN Flashcards
Risks of high blood pressure
- increased morbidity and mortality from HTN mediated organ damage (HMOD)
- BP and TOD (every 20mmhg increase in SBP and 10 mmHG DBP 2x risk)
HMOD from HTN
- heart disease (CAD: angina, MI) (systolic heart failure) (LVH)
- brain disease (CVA, TIA, hemorrhagic stroke, dementia)
- PAD
- CKD
- eye disease (retinopathy)
Prescription induced causes of HTN
- Amphetamines: Ritalin, Adderall
- Corticosteroids: prednisone
- NSAIDS: ibuprofen, naproxen, high dose aspirin
- Estrogen-containing oral contraceptives
- Anabolic steroids: androgens/ test
- Calcineurin inhibitors: tacrolimus, cyclosporine
- SNRIs: venlafaxine (Effexor) or desvenlafaxine (Pristiq)
- Oral decongestants: pseudoephedrine, phenylephrine
- Abruptly stopping beta blocker therapy
- Abrupt central acting alpha-agonist therapy
Non-prescription drug induced causes of HTN
- Drug abuse: cocaine, nicotine, narcotic, PCP
- Dietary supps/ food:
Sodium intake
Ethanol intake
Dietary supplements
Tyramine-containing foods (wine, aged cheese)
MOA inhibitors (antidepressants)
Dietary supplements that can lead to HTN
St johns wort; herbal ecstasy, bitter orange, guarana, kava, high dose licorice
First line medications
ACE (prils)
ARBS (sartans)
Thiazide diuretics
CCB: dhp (ipines), non-dhp (diltiazem, verapamil)
ACEs drug names
- PRIL
ARBS drug names
- sartan
Thiazide diuretic drug names
Hydrocholorothiazide
Chlorothiazide
Chlorothalidone
Indapamide
Metolazone
CCB drug names
DHP:
-dipine
non-DHP:
Verapamil
Diltiazem
Direct renin inhibitor drug name
Alskiren
DRI rationale
Other drugs affecting RAAS system cause compensatory increase in renin production
DRI side effects
hyperkalemia, hypotension
DRI treatment guidelines
- Avoid combination with DRI, ACE, ARB (dual RAAS blockage)
- minimal BP benefits in combination
- Significantly increased risk in combination (Scr, K+)
ACE side effects
hypotension, hyperkalemia, dry cough
ARB side effects
Hypotension, Hyperkalemia
ACE/ARB/DRI adverse effects
- dizziness/ hypotension (especially if hypovolemic
- Hyperkalemia
- Non-productive dry cough (ACE only)
- Increased SCr (limited rise <30% okay)
ACE/ARB/DRI very rare risks
- Hepatotoxicity
- Neutropenia
- Angioedema (increased in African Americans): ACE>ARB>DRI
ACE/ARB/DRI contraindications
Hypersensitivity, pregnancy, bilateral renal stenosis
ACE/ARB/DRI warnings/ precautions
- Avoid dual RAAS therapy
- Precautions:
Volume depletion/ dehydration
Pre-existing hyperkalemia
Women of child bearing age
Risk of acute renal injury
ACE/ARB/DRI drug interaction potential
- Any drugs with potential for hyperkalemia:
K+ sparing diuretic
aldosterone antagonist
Dual RAAS
Rx potassium supplements
OTC salt substitutes (No salt, Nu salt) - Diuretics: risk of dizziness/ hypotension
- Lithium: Li toxicity with concomitant ACE
ACE/ARB/DRI monitoring
- 1-2 weeks for initial impact, 4 weeks for full BP lowering impact
- Safety: Scr, K+ (BMP or CMP)
acceptable: SCr < 30-35%
unacceptable SCr> 30-35% (AKI)
Diuretics for HTN
Thiazide
Loop
K sparing/ Aldosterone antagonist
Thiazide drug considerations
- synergistic BP lowering with ACE, ARB, DRI or BB
- Metolazone: very potent , not used for HTN in general population
- avoid CrCl <30 ml/min
CCB DHP adverse effects
- dose related peripheral EDEMA (avoid in patients with heart failure
- dose related headache
- less common:
dose-related dizziness/ orthostasis flushing, nausea/ anorexia, GERD, gingival hyperplasia
reflex tachycardia
CCB NON-DHP adverse effects
- Bradycardia
- potential cardiac conduction abnormalities (AV block)
- Systolic heart failure (negative inotropic effects)
- Constipation (verapamil)
- less common: nausea, GERD, headache, dizziness, flushing
CCB contraindications
- pregnancy/ lactation
- hepatic/ renal dysfunction
amlodipine: hepatic clearance
diltiazem: renal clearance
verapamil, nifedipine: renal and hepatic clearance
NON-DHP subclass contraindications:
- concomitant beta blocker
- cardiac conduction abnormalities: AV block
- Systolic heart failure/ LV dysfunction
DHP contraindications
- short-acting/ immediate release nifedipine for HTN (lead to reflex tachycardia/ rebound HTN, increased risk of MI/CVA)
- Nifedipine XL- avoid in systolic heart failure/ LV dysfunction
- Migraines
CCB drug interaction potential
- Avoid NON-DHP + beta blocker for HTN (risk of bradycardia/ AV block
- major P450 interactions
verapamil, diltiazem & nifedipine are 3A4 inhibs/ substrates:
increase erythromycin, increase digoxin, interaction with simvastatin, should not ingest with >1L/day grapefruit juice
Non first line medication classes:
- Loop diuretics
- K+ sparing diuretics/ aldosterone antagonist
- Beta blockers
- Central alpha-2 agonist
- Alpha- 1 antagonist
- Direct vasodilators
Loop diuretic drug names
Furosemide
Torsemide
Bumetanide
Ethacrynic acid (no sulfa group)
K+ sparing diuretics/ aldosterone antagonist drug names
Spironolactone
Eplerenone
Beta blocker drug names
- non selective: propranolol, nadolol, pindolol, timolol
- B1 selective (BEAM): Bisoprolol, Esmolol, Acebutolol, Atenolol, Metoprolol
Alpha- antagonist drug names
For HTN: Prazosin, Terazosin, Doxazosin
Not for HTN: Tamsulosin, Silodosin, Alfuzosin
Central alpha-2 agonist drug names and uses
Clonidine (used for HTN emergencies/ urgencies)
Methyldopa: used in pregnancy
Guanfacine: low dose outpatient
Direct vasodilator drug names and uses
Hydralazine: hair growth
Minoxidil
Loop diuretics considerations
- CKD with CrCl <30 ml/min: more effective than THZ for HTN population
- Systolic heart failure: more effective than THZ with concomitant edema
K+ sparing diuretics consideration
- Limit hypokalemia
- Use in combo with THZ, weak Anti-hypertensive effect alone
- Increased hyperkalemia risk with concomitant ACE,ARB,DRI
- CrCL <50 ml/min
Eplerenone: more expensive than spironolactone
spironolactone: gynecomastia risk for men, effective add-on in resistant HTN
Diuretic metabolic serum electrolyte considerations
hyponatremia
hypokalemia (loop> THZ)
hyperkalemia (K+ sparing)
hypomagnesemia (Loop> THZ)
hypercalcemia (THZ)
hypocalcemia (Loop)
hyperuricemia (THZ>loop)
hyperglycemia (high dose THZ or LOOP)
hyperlipidemia (high dose THZ or LOOP)
Diuretic warnings
Anuria
Ototoxicity: loop diuretics
Dehydration (hypovolemia)
Hypotension
Electrolyte imbalance
CKD
hepatic disease
gout (THZ > loop)
hyperglycemia (high dose THZ or LOOP)
hyperlipidemia (high dose THZ or LOOP)
child bearing age/ lactation
Diuretic interaction potential
Anything that increases K levels (KCL, ACE,ARB,DRI,K sparing/ aldosterone antagonist)
Digoxin (LOOP> THZ): increased toxicity/ arrhythmias
lithium: toxicity
Cholestyramine: 85% reduction of HCTZ absorption
Eplerenone: hyperkalemia with grapefruit juice
Beta Blocker considerations
- Inferior protection from HMOD vs 1st line anti-HTN
- Not as protective when used as Monotherapy but do not increase CV events
Beta blocker adverse effects
- Bradycardia
- Exercise intolerance
- Bronchospasm (risk with asthma/ COPD)
- higher risk with non-selective or alpha/beta > cardioselective agent - hypotension and dizziness/ orthostatic hypotension (carvedilol/ labetalol w/c both work on A and B receptors)
- Diarrhea- especially alpha/ beta blockers
- Dyslipidemia- less impact with B1 selective, no impact w/ alpha beta
- weight gain
- erectile dysfunction
- depression
Beta Blocker adverse effects in DM
- Hyperglycemia (non-selective BB)
- Hypoglycemia (non-selective BB)
Beta blocker warnings
- avoid abrupt withdrawal (rebound HTN/ CAD exacerbation)
- asthma/ COPD
- Orthostatic hypotension
- Bradycardia/ cardiac conduction abnormalities
- PAD
- Heart failure
- uncontrolled DM
- CKD
- Hepatic disease (propranolol, metoprolol, carvedilol)
Sympatholytics drug names
Central alpha-2 agonists: clonidine, methyldopa, guanfacine
Alpha-1 antagonists: prazosin, doxazosin, terazosin
central alpha-2 agonist considerations
clonidine in HTN urgency/ last line resistant HTN
methyldopa: can be used in pregnancy but adverse effects on liver or anemia
Central alpha-2 agonists adverse effects
- Sodium/ water retention
- orthostatic hypotension/ dizziness
- anticholinergic: sedation, dry-mouth, constipation, urinary retention, blurry vision
- CNS depression: increase effects of alcohol, barbiturates, sedatives
- bradycardia (consider any drugs that can cause AV block: nonDHP, CCB, BB, digoxin)
- Headache
- CNS stimulation: excitability/ restlessness
- Erectile Dysfunction
- Rebound HTN if not tapered off
Adverse Affects of Methyldopa:
- Systemic Lupus erythematosus
- Rare hemolytic anemia
- Hepatic Dysfunction
Central Alpha-2 agonist warnings
- Elderly
- Heart Failure
- renal impairment
- Avoid abrupt withdrawal
- Methyldopa: liver disease, use with diuretic therapy in non-pregnant patients
Central Alpha-2 agonist interactions
- Abrupt discontinuation of clonidine with concomitant BB results in rebound HTN
- Bradycardia risk increased with other drugs that lower HR
Alpha-1 antagonist considerations
No comorbid benefit for any disease state related to HTN
OK for symptomatic relief of BPH
Direct Vasodilators adverse class effects
- Na/ H2O retention: hypernatremia, edema, heart failure
- Reflex tachycardia: palpitations, chest pain, angina, tachyarrhythmia
- Headache
- CNS depression
- Hypotension, dizziness
Hydralazine adverse effects
- common nausea, vomiting, diarrhea, anorexia
- rare hepatotoxicity, rare drug induced lupus, drug fever, leukopenia
Minoxidil adverse effects
- Black Box for pleural effusion that can lead to cardiac tamponade and angina pectoris exacerbation: only for HTN not responsive to maximum therapeutic doses of diuretic and 2 other HTN agents
- reversible hypertrichosis/ hirsutism (rogaine)
Direct vasodilator warnings
- Compensatory increased HR: should use with concomitant beta blocker, avoid with tachyarrhythmia
- Compensatory increased sodium/ water retention: use with concomitant diuretic
- Avoid if: Heart failure, recent MI/ angina, CNS depression, CVA/TIA, pregnancy or lactation, CKD
First line HTN drugs
ACE, ARB, Thiazide, CCB
Heart Failure drugs for HTN
ACE, ARB, BB (first line), Diuretics
DM drugs for HTN
ACE, ARB
CKD drugs for HTN
ACE, ARB
ACS drugs for HTN
BB, ACE, ARB
Pregnancy drugs for HTN
Labetalol, Nifedipine, Hydralazine, Methyldopa
African American HTN
Thiazides, CCB, ARB