HTN (Day 1 and 2) Flashcards
What is the ratio of adults who have HTN?
1 in 3
What is HTN a risk factor for?
Development of heart disease, stroke, heart failure, renal disease
What are Risk Factors for hypertension?
Smoking Obesity (BMI > 30) Physical inactivity Dyslipidemia DM Renal dysfunction Age: Men > 55yo, Women > 65 yo Fam hx.
What percentage of HTN cases are essential HTN?
Greater than 90%
What is essential HTN?
Hereditary/idiopathic
What percentage of HTN cases are secondary HTN?
Less than 10%
What are common causes of secondary HTN?
Chronic kidney disease, renovascular disease
What does systolic BP represent?
Cardiac contraction
What does Diastolic BP represent?
Filling of the heart
TPR
Total peripheral resistance : sum of total peripheral resistance in peripheral vasculature (represents DBP)
What medication should be used for HTN in a pt with a cardiac hx?
Beta-Blocker
What does systolic BP represent?
Cardiac contraction
Majority of pt’s will require ________ to reach goal?
a. Monotherapy
b. At least 2
c. At least 3
d. No therapy just lifestyle change
B-At least 2
What are some lifestyle modifications that can be used in non-pharmacological tx of HTN?
Smoking cessation Wt. loss-in overweight and obese DASH diet Dietary sodium reduction Increased physical activity Limit alcohol to no more than 1-2 daily
What is the most effective non-pharmacologic tx for HTN?
Wt. Loss
What are the firs line options for tx of HTN?
Thiazides
CCB’s
ACE-I
ARB’s
What is the best choice to use in a black pt with HTN?
Thiazides or CCB’s
What first line meds should be avoided in a black pt?
ACE-I
ARB’s
What medications are best for use in a pt w/ HTN who has chronic kidney disease?
ACE-I
ARB’s
*regardless of race.
Would you use both ACE and ARB together according to JNC 8?
NO - JNC 8 says not to use together because of increased risk of renal dz/
What medication should be used for HTN in a pt with a cardiac hx?
Beta-Blocker
Describe option 1 for tx. pt with HTN?
- start drug 1 and max the dose
- add 2nd agent if still not at goal-max dose
- add 3rd agent
Describe option 2 for tx. pt w/ HTN?
- Start drug 1 and if not at goal add drug 2 prior to maxing out drug 1 dose.
- Max the dose on both drugs
- If not at goal add drug 3
Describe option 3 for tx. pt w/ HTN?
- Start w/ 2 drugs right from the beginning. Max these out.
- Start drug 3 if needed
When would you use option 3 for tx. of a pt . w/ HTN?
When SBP>160 and/or DBP>100
What is MOA for Thiazide Diuretics?
Inhibit sodium reabsorption in the DISTAL TUBULE.
What is the result of the inhibition of sodium reabsorption on water in the distal tubule?
Less H20 is retained-Pee it out!!
What medications are in the class Thiazide Diuretics?
HCTZ
Chlorthalidone
Metolazone
Which thiazide diuretic is not typically used daily because it is very potent?
Metalozone
T/F Thiazides can be used as first line therapy for pt’s with DM who have HTN.
True!
What electrolyte abnormalities are assoc. with Thiazide diuretics.
Decreased K
Decreased Na
Increased Ca
Increased Uric Acid
Increased Glucose
Other than electrolyte imbalances what are ADE’s of thiazides?
Orthostatic Hypotension Photosensitivity Increased Urination (blocking reabsorption on Na)
What medication is a look like for Thiazide Diuretics in the body and therefore should be cautioned if pt. is allergic?
Sulfa
OK to use if not an anaphylaxis reaction but caution
T/F Thiazide diuretics are a good choice for pt’s with renal disease
False!
In pt’s with severe renal disease the kidney is working really hard to get to the Distal tubule to begin with so Thiazide diuretics are a bad choice because they will be ineffective.
What other medication should be avoided when taking thiazide diuretics due to the fact that it will increase the concentrations?
Avoid with Lithium. May increase Lithium conc.
Are loop diuretics considered first line?
No. The thiazide diuretics are the only first line diuretic choice.
What drugs are in the class of loop diuretics?
Furosemide
Bumetanide
Torsemide
Which loop diuretic is the most potent?
Torsemide
Which loop diuretic is the least potent and most used?
Furosemide (Lasix)
What are loop diuretics more commonly used for (as opposed to Thiazides)
Heart failure and cardiac history. Especially helpful with Edema
What is the Mechanism of action for loop diuretics?
Inhibits active transport of sodium, chloride, and potassium in the thick ascending limb of the LOOP OF HENLE causing excretion of these ions. This means the collecting duct excretes more water!!!
What is significant about the location of where the loop diuretics work?
Earlier removal of fluid means that more fluid is removed and the kidney does not have to work as hard to get to the site of action of the drug.
What are the electrolyte abnormalities associated with loop diuretics?
Decreased K
Decreased Na
Decreased Ca
Decreased Mg
Increased Uric Acid
What other adverse effects are related to loop diuretics?
Dehydration
Ototoxicity
Increased SCr (esp if pt is dehydrated)
Is a loop diuretic a good choice for a pt with renal disease?
NO-Nephrotoxicity may occur, you have to watch the kidney when giving this med to begin with.
What medication do Loop Diuretics mimic in the body and therefore if there is an allergy you must take caution when taking.
Sulfa
What is the MOA of Aldosterone receptor blockers?
blocks the aldosterone receptors which normally would tell mRNA to produce Na and K channels preventing Na reabsorption and K excretion. A buildup of Na in the tubule causes water to flow into the tubule from the blood.
What is the common trend of diuretics so far?
They all cause sodium to hang around for longer in the Tubular lumen.
H20 follows Na and is excreted.
Difference between Loop Diuretics and Thiazide Diuretics?
Thiazide diuretics work to hold on to ~5% Na, and Loops hold on to ~25% Na. Loops are found earlier in the schematic and therefore excrete more since they are stronger at diuresing.
Difference between the potassium sparing diuretics?
Aldosterone receptor blockers-block aldosterone, and inhibit production of Na K channels
K+ sparing diuretics-Block Na+ channels that would typically facilitate indirectly the opening of K+ channels.
What are medications in the class Aldosterone Receptor Blockers?
Spironolactone
Eplerenone
What is the MOA for Potassium sparing drugs?
(NO effect on Aldosterone!!) Block Sodium reabsorption and potassium excretion.
When are potassium sparing diuretics used?
Often in combination with a thiazide for HTN.
What additional use other than HTN can Spironolactone (a potassium sparing diuretic) be used for?
Class 4 heart failure
What are the adverse effects of potassium sparing diuretics?
Hyperkalemia (caution in pts with renal failure)
Gynecomastia, menstrual irregularities
Eplerenone (not used as much as spironolactone)-More selective thus less side effects.
What is the PRIMARY function of ACE?
ACE hooks up with Angiotensin I to produce Angiotensin II. It can then act on AT1 and AT2 receptors to produce vasoconstriction which increases BP.
Other than the conversion of Angio I to Angio II what does ACE do?
breaks down Bradykinin which is a vasodilator
What is the MOA of ACE-I?
inhibits ACE and blocks production of ATII
Inhibits breakdown of Bradykinin (vasodilator)
-this lowers BP but also adversely effects inflammatory mediation.
Dilates efferent arteriole of the kidney
What is the first line option for pt’s with CKD???
ACE-I
When are ACE inhibitors used?
First line drug class in HTN
First line in CKD
Used in CHF