Hypertension with compelling indications Stage 1 hypertension (SBP 140-159 or DBP 90-99 mmHg) Thiazide-type diuretics for most May consider ACE inhibitor, ARB, -blocker, CCB, or combination Stage 2 hypertension (SBP ≥160 mmHg or DBP ≥100 mmHg) 2-drug combination for most (usually thiazide-type diuretic and ACE inhibitor or ARB or - blocker or CCB) Drug(s) for compelling indications Other antihypertensive drugs (diuretics, ACE inhibitor, ARB, -blocker, CCB) as needed Not at goal BP Lifestyle modifications JNC 7 VII, Hypertens. 2003;42:1206-1252. Not at goal BP (<140/90 mmHg or <130/80 mmHg for those with diabetes or chronic kidney disease) Initial drug choices Hypertension without compelling indications Optimize dosages or add additional drugs until goal BP is achieved Consider consultation with hypertension specialist JNC 7 - Algorithm for treatment of hypertension For Internal Use Only
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Hypertension with compelling indications
Stage 1 hypertension (SBP 140-159 or DBP 90-99 mmHg)
Thiazide-type diuretics for most
May consider ACE inhibitor, ARB, -blocker, CCB, or combination
Stage 2 hypertension (SBP ≥160 mmHg or DBP ≥100 mmHg)
2-drug combination for most (usually thiazide-type diuretic and ACE inhibitor or ARB or -blocker or CCB)
Drug(s) for compelling indications
Other antihypertensive drugs (diuretics, ACE inhibitor, ARB, -blocker, CCB) as needed
Not at goal BP
Lifestyle modifications
JNC 7 VII, Hypertens. 2003;42:1206-1252.
Not at goal BP (<140/90 mmHg or <130/80 mmHg for those with diabetes or chronic kidney disease)
Initial drug choices
Hypertension without compelling indications
Optimize dosages or add additional drugs until goal BP is achievedConsider consultation with hypertension specialist
JNC 7 - Algorithm for treatment of hypertension
For Internal Use Only
ESH/ESC guidelines Pharmacological Treatment of
HypertensionConsider :Blood pressure level before treatment
Absence or presence of TOD and risk factors
Two-drug combination at low dose
Choose between :
Single agent at low dose
If goal BP not achieved :
Previous agent at full dose
Switch to different agent at low dose
Previous combination at
full dose
Add a third drug at low dose
If goal BP not achieved :
Two-three drug combination Two-three drug combination
ESH/ESC Guidelines. J Hypertens 2003; 21: 1011-1053For Internal Use Only
“The major classes of antihypertensive agents
(diuretics, ß-blockers, calcium antagonists,
ACE inhibitors, angiotensin-receptor antagonists)
are suitable for the initiation and maintenance of
therapy”
Position statement: Choice of antihypertensive drugs
• To reach diabetic hypertension goals, combination therapy is most often required
• Evidence indicates that combinations including an ACE inhibitor in Type 1 diabetes and an ARB in Type 2 diabetes provide renoprotection benefits
For Internal Use Only
JNC 7: Goals and RecommendationsGoal: To reduce cardiovascular, renal morbidity and mortality
• For patients older than 50 years, SBP 140 mm Hg is a more important CVD risk factor than DBP
• Thiazide-type diuretics should be used in drug treatment for most patients with uncomplicated hypertension, either alone or in combination with drugs from other classes
• High-risk conditions are compelling indications for the initial use of specific antihypertensive drug classes
• Most patients will require 2 or more antihypertensive agents to reach their goal blood pressure
• If BP is 20/10 mm Hg above goal, consideration should be given to initiating therapy with two agents, one of which should usually be a thiazide-type diuretic JNC 7 VII, Hypertens. 2003;42:1206-1252
For Internal Use Only
JNC-7 Guidelines Diabetic hypertension
• Thiazide diuretics, ß-blockers, ACE inhibitors, ARBs and CCBs have been shown to reduce CVD and stroke incidence in diabetic hypertension
• In diabetic hypertension, combinations of 2 or more medications are usually needed to achieve target BP of < 130/80 mmHg
• ACE- and ARB-based treatments favourably affect the progression of diabetic nephropathy and reduce albuminuria
• ARBs have been shown to reduce progression to macroalbuminuria
Chobanian AV et al. The seventh report of the Joint National Committee on prevention, detection, evaluation, and treatment of high blood pressure: the JNC 7 report. JAMA 2003;289:2560-72.
For Internal Use Only
ESH/ESC guidelines Elderly Patients
• Cardiovascular events can be reduced by antihypertensive treatment also in older patients with isolated systolic hypertension
• BP lowering should be gradual particularly in frail patients• Measure BP also in the erect posture to evaluate
excessive postural effects• Tailor therapy on concomitant risk factors and disease
(frequent in the elderly)• Use two or more drugs, if necessary• In subjects aged > 80 years, evidence of benefit from
antihypertensive therapy is still weak ESH/ESC Guidelines. J Hypertens 2003; 21: 1011-1053
1. UK Prospective Diabetes Study Group. BMJ. 1998;317:703-713. 2. Estacio RO et al. Am J Cardiol. 1998;82:9R-14R.
3. Lazarus JM et al. Hypertension. 1997;29:641-650. 4. Hansson L et al. Lancet. 1998;351:1755-1762.
5. Kusek JW et al. Control Clin Trials. 1996;16:40S-46S. 6. Lewis EJ et al. N Engl J Med. 2001;345:851-860.
7. ALLHAT. JAMA. 2002;288:2998-3007.For Internal Use Only
Average number of daily pills
0
10
20
30
40
50
60
70
1 2 3 8
Complianceto
treatment(%)
Mancia G et al. Am J Hypertens 1997; 10: 153S-158SFor Internal Use Only
Compliance to Treatment Related to Daily Number of Pills Prescribed
Persistence rates of one pill of lisinopril/HCTZ in fixed-combination vs two separate pills of lisinopril and HCTZ
100 95 90 85 80 75 70 65 60 55 50
0 1 2 3 4 5 6 7 8 9 10 11 12
Months
Persistence(%) 68.7
57.8
18.8%
Lisinopril/HCTZ (1 pill)
Lisinopril and HCTZ (2 pills)
Fixed-dose Combination Therapy Increases
Compliance to Treatment
Dezii CM. Manag Care 2000; 9 (Suppl): s2-s6For Internal Use Only
JNC 7 Report. JAMA 2003; 289: 2560-2572
JNC 7 2003 Guidelines Pharmacological Treatment
• Most patients with hypertension will require 2 or more antihypertensive medications to achieve their BP goals...
• When BP is more than 20/10 mmHg above the goal, consideration should be given to initiating therapy with two drugs, either as separate prescriptions or in fixed-dose combinations
• Use of fixed-dose combination drugs should be considered to reduce prescription costs...
• To reach target BP, it is likely that a large proportion of patients will require combination therapy...
• According to the baseline BP and the presence or absence of complications, it appears reasonable to initiate therapy with a low-dose combination of two agents
• Fixed low-dose combinations are available in Europe, allowing the administration of two agents within a single tablet, thus optimizing compliance
For Internal Use Only
The 3 Classes of Diuretics and Their Primary Sites of Action in
the Nephron
For Internal Use Only
Adapted from: Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
Thiazide Diuretics
• Duration of action of 12–24 hours• Blood pressure lowering effect with low doses• Additive blood pressure lowering effect when used in combination with
other antihypertensive drugs• Main side effects:
- hypokalemia- hyponatremia- hyperglycemia- altered plasma lipid concentration- hyperuricemia or gout- impotence (reversible on withdrawal of treatment)
Bendroflumethiazide 1.25-2.5 mg once dailyChlorthalidone 12.5-25 mg once dailyHydrochlorothiazide 12.5-25 mg once dailyIndapamide 2.5 mg once daily or 1.5 mg
of sustained release (SR) preparation
For Internal Use OnlyLip G and Bakris G. Handbook Hypertension Management. CMG 2006
Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
For Internal Use Only
Diuretics that Cause Potassium Retension• Triamterene 50 - 100 mg/d
• Amiloride 5 – 10 mg/d• Spironolactone 25 – 100 mg/d• Weak diuretics• Little effect on blood pressure• Cause retention potassium• Combined to thiazide or loop diuretics to prevent or remedy
hypokalemia• Main side effects:
- hyperkalemia
- hyponatremia
- rashesLip G and Bakris G. Handbook Hypertension Management. CMG 2006
For Internal Use Only
The Mechanism of Calcium-Channel Blockade
For Internal Use Only
Adapted from: Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
Calcium-Channel Blockers
• Class I (phenylalkylamine): (e.g. verapamil) act as antihypertensive agents by causing vasodilation of peripheral blood vessels. They also depress sinoatrial and atrioventricular nodal conduction, slowing the heart rate.
• Class II (dihydropyridine): (e.g. amlodipine and nifedipine) primarily cause vasodilation of both coronary and peripheral arteries. They have little or no effect on the strength of cardiac contractions or electrical conduction through the heart.
• Class III (benzothiazepine): (e.g. diltiazem) have peripheral and coronary vasodilator properties, and also inhibit cardiac conduction.
Amlodipine 5-10 mg once dailyFelodipine 5-10 mg once dailyNifedipine LA 20-60 mg once dailyDiltiazem LA 120-540 mg once dailyVerapamil modified release (MR) 240 mg once to twice daily
Lip G and Bakris G. Handbook Hypertension Management. CMG 2006For Internal Use Only
Calcium-Channel Blockers• Main side effects:
- Flushing, headaches and dizziness (short-acting Class II)
- Reflex tachycardia (short-acting Class II)
- Peripheral edema (short-acting Class II)
- Bradycardia
* Class I (verapamil)
* Class II (diltiazem)
- Constipation (commonly occurs with verapamil)Adapted from: Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006For Internal Use Only
The Mechanism of Beta-Blockade
Reduced cardiac output
Reducedblood
pressure
Impulse
Smooth muscle presynaptic sympathetic neurons
Cardiac tissue (contains beta1 receptors)
Increased bronchial resistance
and vasoconstriction
Impulse
Smooth muscle presynaptic sympathetic neurons
Tissue of the peripheral blood vessels, smooth muscle cells or lungs (contains beta2 receptors)
Beta-blockerNonadrenaline or adrenaline
Beta1 receptorsBeta2 receptors
Reduced heart rate and force
of constriction
Beta1 receptor blocked by beta-blocker
Beta2 receptor blocked by beta-blockerAdapted from: Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
• * They are effective antihypertensive drugs:- reduce cardiac output- alter baroreceptor reflex sensitivity- block peripheral beta-adrenergic receptors
• * Cardioselective beta-blockers- Act on beta1 receptors (found mainly in the heart) and results in:
* reduction of heart rate* reduction of myocardial contractility* reduction in the rate of conduction of impulses through the heart* reduction of blood pressure* suppression of adrenergic-induced renin release and breakdown of fat
• * Non-selective beta-blockers- Act on beta1 and beta2 receptors (found in bronchial tissue and peripheral blood vessels) and results in:
- minor adverse effects on plasma lipid profile and glycemia Adapted from: Oparil S and Weber MA.
Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
For Internal Use Only
Total peripheral resistanceincreased
BloodPressure
rises
Constriction of blood vessel
Impulse
Smooth muscle presynaptic sympathetic neurons
Vascular smooth muscle cell
Total peripheral resistancedecreased
Bloodpressure
falls
Blood vessel remains dilated
Impulse
Smooth muscle presynaptic sympathetic neurons
Alpha1 receptor blocked so muscle cells do not contract
Alpha1 receptor blockerNonadrenaline or adrenaline
Alpha1 receptorsAlpha2 receptors
The Mechanism of Alpha-Blockade
For Internal Use Only
Adapted from: Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
Doxazosin 1-16 mg once dailyTerazosin 1-10 mg once daily
Alpha-Blockers
• Two classes of alpha-blockers:* selective: act only on alpha1 receptors
- produce vasodilation by blocking the action of noradrenaline at postsynaptic alpha1 receptors in both arterioles and veins. This causes a drop in peripheral resistance and thus blood pressure
- can be used in combination with other antihypertensive drugs- lead to modest improvement in plasma lipid profile and glucose
tolerance* non-selective: act on both alpha1 and alpha2 receptors.
- mainly used to treat pheochromocytoma• Main side effects:
- Postural hypotension- Dizziness, vertigo, fatigue- Urinary frequency and incontinence- Gastrointestinal disturbances (nausea, diarrhea)
Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006For Internal Use Only
The Mechanism of Action of ACE-inhibitors
Angiotensin IBradykininACE
Inhibitor
ACE(from lungs)
Angiotensinogen(from liver)
Renin(from kidney)
Angiotensin IIInactive
kininsVasodilation
Blood pressuredecreases
Retention of saltand water
Increasedaldosterone
Increased bloodvolume
Increased totalPeripheral resistance
Vasoconstriction
Blood pressure increase
Bradykininpathway
RAASystem
For Internal Use Only
Adapted from: Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
Captopril 12.5 mg twice daily - 50 mg three times dailyEnalapril 5-40 mg once dailyLisinopril 2.5-40 mg once dailyRamipril 1.25-10 mg once dailyPerindopril 2-8 mg once dailyTrandolapril 1-8 mg once daily
• * ACE inhibitors are particularly indicated for hypertension in patients with type 1 diabetes and nephropathy.
• * ACE inhibitors may be used in patients with heart failure, evidence of left ventricular dysfunction or postmyocardial infarction.
• ACE inhibitors can be used with other antihypertensive drugs for an additive blood pressure lowering effect.
• Main side effects:- Persistent irritating dry cough (20% of patients)- Angiodema- First-dose hypotension- Hyperkalemia- Gastrointestinal effects (dyspepsia, nausea, diarrhea)
ACE-inhibitors
For Internal Use OnlyAdapted from: Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
Adapted from Unger T. Am J Cardiol 2002; 89 (suppl):3A-10A.
AT1 Receptor
Na reabsorption
Aldosterone release
Sympathetic outflow
Vasopressin secretion
Vasoconstriction
Vascular and cardiac hypertrophy
Angiotensinogen
Angiotensin I
Angiotensin II
Non-ACE enzymes (cathepsin, chymase)
Renin
Bradykinin
ACEInactive Fragments
AT2 Receptor
Vasodilation
Growth inhibition
Apoptosis
Blood Pressure
ARBs
For Internal Use Only
Mechanism of Action of Angiotensin II Receptor Blockers (ARBs)
HTNHTN, post MI, CHF
HTNHTN, Nephropathy T2DM +
HTN, Morbi-Mortality reduction and stroke prevention in HTN with
For Internal Use Only Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
ARBs SummaryActions of ARBs
- ARBs block the RAA system further downstream than ACE inhibitors- They block the actions of angiotensin II by binding to the AT1 receptor- They lower blood pressure by inhibiting the effects of angiotensin II
Uses of ARBs- All ARBs are indicated for the treatment of hypertension (HTN).- Aprovel and losartan are indicated for the treatment of renal disease in patients with HTN and type 2 diabetes- Losartan is indicated for stroke prevention in patients with HTN and LVH.- Valsartan is indicated postmyocardial infarction in patients with left ventricular failure or
left ventricular systolic dysfunction.- ARBs are usually prescribed in a once-daily regimen.- Candesartan is the only ARB licensed for the treatment of essential hypertension and for patients with heart failure and impaired left ventricular systolic function as add-on therapy to ACE inhibitors or when ACE inhibitors are not tolerated.
Tolerability of ARBs- ARBs have a good tolerability (comparable to placebo)- They don’t provoke persistent dry cough (no inhibition of bradykinin breakdown)- Occasionally: hypotension, hyperkalemia
For Internal Use Only
Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006
Other antihypertensive agents
• Centrally-acting drugs (methyldopa, moxonidine)
• Direct vasodilator (hydralazine, minoxidil)
Poorly tolerated - headache, palpitation, edema- drug-induced lupus syndrome (hydralazine)- hirsutism in women (minoxidil)
Used when other treatments have failedUsed in special conditions (pregnancy)
Moxonidine 200 mg once daily – 300 mg twice dailyHydralazine 25-5- mg twice dailyMinoxidil 2.5-50 mg in 1-2 doses
Adapted from: Oparil S and Weber MA. Hypertension.Elsevier/Sanders 2nd ed. 2005; Lip G and Bakris G. Handbook Hypertension Management. CMG 2006