HTN Flashcards
Correct BP technique
- Automated electronic device > sphygmomanometer
- Take 2 readings 1-2 minutes apart
- Measure BP in both arms @ initial visit
__% of cases of ischemic HD & CVA are attributable for HTN
50
What is the new BP goal?
130/80
Even though some do well with a new goal of 130/80, what else do we need to consider when establishing BP goals?
Tailor to the PATIENT
e.g. pt. with orthostatic hypotension -> goal of <140/90 more appropriate
Treatment for normal BP (120/80)
Maintain health lifestyle habits
Treatment for elevated BP (120-129/<80)
Lifestyle changes + check for meds that can raise BP
Treatment for Stage 1 HTN (130-139/80-89)
- Lifestyle changes alone if ASCVD risk is <10%
- BP meds for pts. with CV disease, DM, CKD, or ASCVD >10%
Treatment for Stage 2 HTN (>140/90)
Lifestyle changes + BP meds
Who do we suggest home BP monitoring for?
ALL pt. (esp. if you suspect white coat HTN, resistant HTN)
What do you do if you use an automatic BP monitor in the office and get a high/unusual BP read?
Verify with manual check (esp. before changing med!)
How do anti-HTN agents compare to each other?
They are roughly equally effective
Black pt. respond less to what meds?
ACEI, ARBs, BB
Preferred anti-HTN meds (combos)
- ACEI or ARB + thiazide
- ACEI or ARB + DHP-CCB
Meds that induce HTN
- OCPS
- Stimulants
- Transplant meds (cyclosporine)
- EPO
- Corticosteroids
- NSAIDs
- Sympathomimetics
- Neuropsychiatrics
25% of pts stop anti-HTN within _____
6mo
What can cut nonadherence?
- Identifying ADRs & switching therapy
- Eval cost
- Explain importance of mgmt
- Get pts engaged
- Advise pt to engage automatic refill program
What is chronotherapy?
Taking >1 BP med at night
In what patients should chronotherapy should be recommended?
Pt. w/ morning BP rise OR pt. whose BP dose NOT dip @ night like it should
Chronotherapy has what additional benefit?
Lowers CV risk
What is the best predictor of BP control?
Med adherence
Mannitol formulations
IV, urogenic solution
Mannitol MOA
Nonabsorbable polysaccharide that acts as an osmotic diuretic (“sugar that pulls water in”); inhibits Na+ and H2O reabsorption
Mannitol site of action
Proximal tubule and loop of Henle
Mannitol clinical indications
- Decreased ICP ass. w/ cerebral edema
- GU irrigate in TURP or other transurethral procedure
What do we monitor in a pt. on mannitol?
- Daily I&O
- Renal fcn & electrolytes
- Serum & urine osmolality
Mannitol ADRs
- Fluid & electrolye imbalance
- Dehydration/hypovolemia secondary to rapid diuresis
Drug interactions of ALL anti-HTN meds
Anti-HTN & vasodilators (e.g. nitrates, PDE5 inhibitors)
Acetazolamide formulations
PO, IV
Acetazolamide MOA
Reversible inhibition of carbonic anhydrase -> ↓ H+ secretion at renal tubule & ↑ renal excretion of Na+, K+, HCO3, & H2O
Acetazolamide site of action
Proximal tubule and loop of Henle
Acetazolamide clinical indications
Acute mountain sickness (prevention or sx relief)
- ↓ blood pH stimulates extra breathing = higher blood [O2]
Loop diuretic drugs
- Furosemide
- Torsemide
- Bumetanide
- Ethacrynic acid
Which loop diuretic does not contain a sulfa group?
Ethacrynic acid
Loop diuretic MOA
Inhibit Na+/K+-ATPase
Loop diuretic site of action
Thick segment (ascending limb) of the loop of Henle
Loop diuretic clinical indication
- Acute pulmonary edema & other edematous states
- Acute hypercalcemia
What do we monitor in a pt. on a loop?
- BMP
- Ca+, Mg+
- Daily wts
Why are loops better than thiazides for treatment of HF?
Loops cause more Na+ secretion which results in a profound diuretic effect
Starting dose for loops
20-40mg qAM (titrate to lowest dose that achieves fluid balance)
Which do we do first for loops: increase the dose or add a second dose?
INCREASE the dose! (“double the dose until the urine flows”)
- Titrate to 80mg qAM; if more needed add 80mg in the afternoon
If additional diuresis/sx relief is needed for a pt. on a loop, what drugs can we add to the treatment regimen?
Aldosterone agonist - spironolactone! (esp. for HFrEF of GFR >30)
Thiazide for persistent sx
Loops work better than thiazides for a GFR of what
<30
Which loop causes the most ototoxicity?
Ethacrynic acid
Drug interactions w/ loops
- NSAIDs (antagonize diuretic effect via Na+ retention)
- Anti-arrhythmics (QT!)
- Lithium toxicity
- Antagonizes gout (urate absorption) & DM medications (hypoK+)
Loop ADRs
- Volume depletion
- HypoK+, hypoMg
- HypoNa+
- Hyperuricemia
- SNHL (“ringing”)
- Hyperglycemia
- Rash (r/t sulfa cross-reactivity?)
Thiazide drugs
- HCTZ
- Chlorthalidone
- Metolazone
- Indapamide
- Chlorothiazide
Which thiazide is the only available IV? (all others tablets)
Chlorothiazide
Thiazide MOA
Inhibit Na+/K+-ATPase
Thiazide site of action
Distal convoluted tubule
Chlorthalidone vs. HCTZ
Chlorthalidone…
- 2x as potent
- Longer DOA
- 25mg more effective than 50mg of HCTZ in decreasing BP at night
- Extensive partitioning into RBCs (creates a “depot”)
- ADRs equivalent
Which do we use more: Chlorthalidone vs. HCTZ?
HCTZ in most fixed-dose combinations
Thiazide indication
HTN
When do we dose thiazides?
In the AM
What do we monitor in a patient on a thiazide?
- BMP
- Ca+, Mg+
Every thiazide beside what drug is less effective when CrCl <30mL/min?
Metolazone
How does thiazide effect Ca++?
Enhances reabsorption (improves hypercalciuria/kidney stones, may benefit osteoporosis) *opposite of loops
Thiazides have the potential to unmask what types of conditions?
Conditions that increase Ca+ (e.g. hyperPTH, CA, sarcoid, PHEOS)
*thaizides do not traditionally cause hypercalcemia
What drug can be used with loop diuretics for synergy in refractory edematous states?
Metolazone
Drug interactions w/ thiazides
- NSAIDs (antagonize diuretic effect via Na+ retention)
- Anti-arrhythmics (QT!)
- Lithium toxicity
- Antagonizes gout (urate absorption) & DM medications (hypoK+)
Thiazide ADRs
- Volume depletion
- HypoK+, hypoMg (@ risk for metabolic acidosis w/ higher doses)
- HypoNa+
- Hyperuricemia
- Hyperglycemia
- Rash (r/t sulfa cross-reactivity?)
- Hyperlipidemia
K+ sparing diuretic drugs
- Spironolactone
- Eplerenone
- Amiloride
- Triamterene
Spironolactone & eplerenone MOA
Anti-aldosterone drug
- Antagonizes mineralocorticoid receptors -> ↓ transcription of gene for Na+/K+-ATPase
Amiloride & triamterene MOA
Inhibit Na+/K+-ATPase
K+ sparing diuretic site of action
Collecting tubule
Which K+ sparing diuretic is the only available as a solution? (all others tablets)
Spironolactone
Spironolactone & eplerenone clinical indication
- Mineral corticoid excess (primary OR secondary - CHF, cirrhosis, nephrotic syndrome)
- Acne vulgaris
- Hirsutism
Amiloride & triamterene clinical indication
Generally used with other diuretics to prevent or correct hypokalemia
- Overall weak diuretic effect
- Falling out of favor d/t addition of ACEI/ARB to diuretics
Do NOT use K+ sparing diuretics for K+ >____ or eGFR
5.5; 30
What do we monitor in a patient on a K+ sparing diuretic?
K+ & BUN/Cr (baseline, 1wk, monthly for 3mo, quarterly for 1yr, then q6mo)
Drug interactions with K+ sparing diuretics
- K+ supplements/salt substitutes
- Drugs that retain K+ (BB, TMP-SMX, NSAIDs, ACEI/ARBs)
K+ sparing diuretics ADRs
Hyperkalemia
Spironolactone ADRs
- TERATOGEN
- Painful gynecomastia
- Amenorrhea
- ED
- ↓ libido
Triamterene ADRs
Nephrotoxin: crystalluria & cast formation => stones or AKI
Use of 2 diuretic drugs acting at a different nephron sites may……
Have a synergistic effect
ACEI drugs end in “___”
pril
What drug is the only true QD ACEI?
Lisinopril (half life = 12hrs)
Which ACEI is a prodrug?
Enalapril
ACE is a kininase, if it’s inhibited what increases?
Bradykinin
What are the implications of ↑ bradykinin
Cough (bad)
Release of endothelial NO = vasodilation (good)
ACEI MOA
Vasodilate efferent arteriole -> ↓ glomerular pressure
ACEI clinical indications
- HTN (esp. w/ LVH)
- HF with systolic dysfcn
- CKD (both DM & non-DM)
- Post-AMI (which resulted in ↓ systolic fcn)
What population is less sensitive to ACEI monotherapy?
AA
ACEI have synergy with what other drug
Diuretics
Are ACEI & ARBs good or bad for the kidneys
Renal protectors!
At what GFR are ACEI not recommended
There is NO absolute GFR when ACEIs can’t be used
- The lower the GFR, the greater the need for neph consultation
What do we monitor in a patient on a ACEI?
- BUN/Cr
- K+