Download - Evidence Based Treatment of Hypertension
Evidence Based Treatment of Hypertension
Harleen SinghPharm.D., Assistant Professor
Ted D. WilliamsPharm.D. Candidate
OSU/OHSU College of Pharmacy
P3 Year – Investing in your Education
Objectives1. Describe the epidemiology of hypertension 2. Identify various physiologic systems that can contribute to the development of
elevated blood pressure. 3. Identify the complications of untreated hypertension.4. Describe the classification of blood pressure in adults. 5. Identify appropriate blood pressure goals for patients with hypertension. 6. Know the disease states and other factors that increase the risk of cardiovascular
complications for a patient with hypertension. 7. Be able to identify secondary causes of hypertension, including drugs. 8. Summarize our current knowledge on the relative effectiveness of
antihypertensive therapy in preventing complications of hypertension. 9. Describe the role of non-pharmacologic management of hypertension and
various lifestyle changes that can be recommended. 10. Describe when drug therapy for hypertension is indicated.
Objectives11. Be able to articulate the advantages, disadvantages,
effectiveness as monotherapy, side effects, contraindications, relative cost, and monitoring parameters for the following classes of antihypertensives: A. Diuretics (Loop, Thiazide, Potassium Sparing)B. Beta-blockers C. Angiotensin-converting enzyme (ACE) inhibitors D. Calcium blockers E. Centrally-acting sympatholytics F. Peripheral sympatholytics and arteriolar dilators G. Alpha blockers H. Angiotensin receptor blockers (ARBs)I. Direct rennin inhibitors
Objectives11. Describe differences among various agents in the same
antihypertensive class. 12. Identify antihypertensives that should not be abruptly
discontinued. 13. Taking into consideration demographics, socio-economic factors,
and medical disorders for a given hypertensive patient, be able to develop an appropriate therapeutic plan (recommend appropriate agent, patient education, and monitoring).
14. Identify factors that can lead to a poor response to antihypertensive therapy.
15. Describe the factors that can influence compliance with antihypertensive therapy.
16. Be able to distinguish between true hypertensive emergency and hypertensive urgency.
The Road Ahead
• Evidence Based Medicine (EBM) Primer• Hypertension Defined, Epidemiology,
Complications• Goals of Hypertension Therapy• Hypertension Treatment Guidelines• Non-Pharmacological Treatments of Hypertension • Pharmacology Review• EBM for pharmacological treatment selection
Evidence Based Medicine
• Evidence-based medicine (EBM)– EBM is the conscientious, explicit, and judicious
use of the current best evidence in making decisions about the care of individual patients.(Sackett 1998)
Pathophysiology, Pharmacology and EBM
• Pathophysiology suggests where we can intervene to improve outcomes
• Pharmacology helps predict likely targets– Therapeutic Effects– Adverse Effects
• Clinical Trials show what happens when we treat 10,000 patients– Evidence Based Medicine lives here
Types of Significance
• Statistical Significance– Can we detect any difference
• Clinical Significance– Do we care if there is a difference
• Patient Significance– Blood Glucose level differences with Thiazide
Diuretics are significantly higher vs. placebo– Increase in Blood Glucose 3-5mg/dL in non-diabetics– Is this clinically significant?
EBM In Real Life
• Question : A patient is taking 25mg HCTZ QDay with BP 140/95. What should the next step be?
• Answer from PharmD: “Continue HCTZ 25mg Q Day and add Lisinopril 10mg Q Day, titrating to 40mg Q Day”
• Response: “Why not increase HCTZ to 50mg Q Day. Micromedex says the max daily dose is 100mg”
• PharmD: ???
JNC-7
• The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure
• Gold Standard EBM in Hypertension diagnosis and treatment
• Express and Full Version
Case• JD is a pleasant 56 yo female with
– Hypertension (HTN)– type 2 diabetes– occasional gout attacks.
• Her last three home BP readings were 145/95mmHg, 153/98mmHg, and 143/92mmHg.
• Today in the clinic she had a BP of 142/89mmHg. • Her last Lipid panel was 2 months ago: LDL 153mg/dL, HDL
63mg/dL, triglycerides 121 • Lisinopril 40mg once daily• Metformin 1000mg BID
Hypertension (HTN) Defined
• Elevated Blood Pressure (BP)– Systolic Blood Pressure (SBP) >=140mmHg– Diastolic Blood Pressure (DBP) >=90mmHg
• Why these values will be discussed later
The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. 2004
Hypertensive Crisis
• Less than 1% of all hypertensive patients will ever have a hypertensive crisis.
• Hypertensive crisis is defined as a diastolic pressure above 120mm Hg.
• There are 2 types of hypertensive crisis: – hypertensive emergency – hypertensive urgency
White Coat Hypertension
• Elevated blood pressure in a clinical setting• Believed to be tied to anxiety• Documented lower blood pressures at home
Epidemiology of Hypertension
• Approximately 50 million people in the U.S. have hypertension.
• The risk of CVD beginning at 115/75 mmHg doubles with each increment of 20/10 mmHg
• There is a strong correlation between blood pressure and cardiovascular morbidity and mortality.– Systolic BP has a stronger correlation than
diastolic BP, but both are important
Epidemiology of Hypertension
• While 70% of hypertensives are aware of their condition and 59% are being treated; only 34% are controlled.
Epidemiology of Hypertension
Prevalence Doubles From 40s to 60s
Epidemiology of Hypertension
The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. 2004
Definitions - Determinants of Blood Pressure
• Arterial blood pressure is generated by the interplay of cardiac output and total peripheral resistance: BP = CO x TPR
• It reaches a peak during cardiac contraction (systolic pressure) and a nadir at the end of cardiac relaxation (diastolic pressure).
• Blood pressure is measured in millimeters of mercury and recorded as systolic (SBP) over diastolic pressure (DBP).
• The difference between the systolic and the diastolic pressure is the pulse pressure (PP)
• Mean arterial pressure (MAP) = 1/3 PP + DBP.
Schematic of the Pathophysiology of Hypertension
Sympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
Adapted from APhA’s Completed Review for Pharmacy. Gourley, DR. 2004
Pathophysiology of Hypertension
1. Increased Sympathetic Activation2. Excessive vascular volume3. Activation of the Renin Anginotensin
Aldosterone System4. Peripheral Resistance
Causes of Hypertension• Idiopathic
– 90-95% of cases have no known etiology• Secondary
– Renal Insufficiency– Coarcation of the aorta– Primary Aldosteronism– Thyroid/parathyroid disease– Cushing’s Syndrome– Pheochromocytoma– Sleep Apnea– Increased Intracranial pressure
• Look for secondary causes, but don’t be surprised if you don’t find them
Hypertension as a Risk Factor
HTN
RETINOPATHY
HEART FAILURE
ISCHEMIC HEART
DISEASECEREBROVASCULAR
DISEASE
PERIPHERAL VASCULAR
DISEASE
CHRONIC KIDNEY DISEASE
Hypertension as a Risk Factor• Hypertension is a primary risk factor for multiple co-
morbidities– Ischemic Heart Disease (IHD)
• aka Carotid Artery Disease (CAD), Coronary Heart Disease(CHD)• Myocardial Infarction (MI)• Angina (Stable and Unstable)
– Heart Failure (HF)– Left Ventricular Hypertrophy or Dysfunction (LVH, LVD)– Cerebrovascular Disease
• Stroke• Transient Ischemic Attack (TIA)
– Chronic Kidney Disease (CKD)– Retinopathy
Goals of Hypertensive Therapy
• Long Term• Short Term
Long Term Goals of Hypertension Therapy
• Direct Measures– Reduced Mortality– Reduced incidence of end organ damage• Cardiovascular• Cerebrovascular• Renal• Retinopathy
– Trailing indicators
Short Term Goals of Hypertension Therapy
• Surrogate markers– Blood Pressure– Leading indicator
• Why is blood pressure a good surrogate marker?
Hypertension and Ischemic Heart Disease
The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. 2004
Hypertension and Stroke
The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. 2004
Hypertension and Cardiovascular Disease
• High Normal = 130-139/85-89mmHg• Normal = 120-129/80-84mmHg• Optimal <120/<80mmHg
The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. 2004
JNC-7 Hypertension Classifications
DBP = Diastolic Blood Pressure, SBP = Systolic Blood Pressure*Treatment should be determined by the highest blood pressure‡Treat patients with chronic kidney disease or diabetes to BP goal of <130/80mmHg
JNC-7 Express: The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. 2004
From JNC-7 to 2007 AHA Guidelines
Primary Prevention
Past Medical History Blood Pressure Goal
Diabetes Melitus
Chronic Kidney Disease
CAD
Left Ventricular Dysfunction
FraminghamRisk Score <140/90 mmHg
<130/80 mmHg
<10%
>10%
<120/80 mmHg
Adapted From Saseen, JJ. Essential Hypertension. Applied Therapeutics: The Clinical Use of Drugs 10 th edition. 2008
CAD Risk Equivalents
Framingham Risk Factors and CAD Equivalents
• Framingham Risk Factors– Age > 45– Total Cholesterol– Smoking– HDL Cholesterol– Systolic Blood Pressure– See ATP III Guidelines for scoring algorithm
• CAD Equivalents– Ischemic Stroke– Transient Ischemic Attack– Peripheral Arterial Disease– Abdominal Aortic Aneurysm
Therapy• Therapeutic Lifestyle Changes (TLC)– Weight– Exercise– Diet– Smoking– Caffeine
• Pharmacotherapy
Therapeutic Lifestyle Changes vs. Pharmacotherapy
Therapeutic Intervention Approximate SBP Reduction
Weight Reduction (5-10% or 10kg) 5-20mmHg
DASH Diet (Low sodium, low fat) 8-14mmHg
Single Antihypertensive 10mmHg (10 over 5 rule)30 minutes exercise most days 4-9mmHg
Dietary Sodium Reduction 2-8mmHg
Reduce alcohol to <=2 drinks/day 2-4mmHg
Adapted From: The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. 2004
Weight Reduction EBM
• Trials of Hypertension Prevention, Phases I and II (TOHP I, TOHP II) Late 1980s, early 1990s– Evaluated Multiple Non-Pharmacological Methods of
weight loss (weight reduction, sodium restriction, mineral supplementation) in pre-hypertensive (DBP 83-89mmHg female, 80-89mmHg male) and BMI approximately 25-35
– Sodium Restriction and Weight Loss were the most effective methods for reducing both SBP and DBP
More Weight Reduction EBM
He, J et. al Long-Term Effects of Weight Loss and Dietary Sodium Reduction on Incidence of Hypertension. Hypertension 2000;35:544-549
Weight Loss p = 0.02 Sodium Reduction p=0.1905
1015202530354045
Comparison of the 7 year cumulative incidence of hyperten-sion between active intervention and control groups for weight
loss and sodium reduction interventions.
ActiveControl
Rat
e(%
) of H
yper
tens
ion
77% Reduction in HTN Rate
DASH Diet & Sodium Restriction
DASH Diet & Sodium Restriction
• Restricted Sodium• Low Fat• High Fiber• Emphasis on Fruits and Vegetables• High Potassium• High Calcium
EBM of DASH Diet & Sodium Restriction
• 412 subjects randomized to typical American diet (control) or DASH diet and to three different sodium levels for 30 days with a 2 week run in period– High 3.5g– Intermediate 2.3g
(Recommended DASH)– Low 1.2g
• Typical American diet is 4,100 mg per day for men and 2,750 for women (JNC-7)
Sacks, et al. Effects on Blood Pressure of Reduced Dietary Sodium and the Dietary Approaches to Stop Hypertension (DASH) Diet. NEJM 2001(1);344:3-10
EBM of DASH Diet & Sodium Restriction
• Controlling for sodium content, the DASH diet provides significant BP reductions
• Add sodium restrictions and further reductions in BP are obtained
Sacks, et al. Effects on Blood Pressure of Reduced Dietary Sodium and the Dietary Approaches to Stop Hypertension (DASH) Diet. NEJM 2001(1);344:3-10
Exercise 30 minutes most days
• A 2002 systematic Meta-analysis of Randomized Control Trials (RCTs) showed the following results– BP reductions appear to be independent of weight
loss– Method of aerobic activity (biking, walking, etc) did
not show a statistically significant link to BP reductions
– Neither frequency nor intensity of exercise showed statistically significant reductions in BP
Whelton SP, Chin A, Xin X, He J. Effect of aerobic exercise on blood pressure: A meta-analysis of randomized, controlled trials. Ann Intern Med 2002;136:493-503. M
Smoking
• Smoking– In the first year
after quitting, excess risk of a cardiovascular event is cut in half, and after 5-15 years, the rate approaches that of a never smoker
Annual Smoking Related Deaths 1995-1999 from Center for Disease Control and Prevention
Caffeine
• Acute vs. Chronic Effects• Surrogate endpoints vs. Primary Endpoints
Caffeine increases BP– Acute elevations in Systolic and Diastolic BP
– But what about Morbidity and Mortality ?Hartley, et al Hypertension Risk Status and Effect of Caffeine on Blood Pressure. Hypertension 2000;36:137-141
Caffeine’s effects on morbidity and mortality
– No controlled trials have demonstrated an increased risk of cardiovascular endpoints
– Several studies have demonstrated no linear relationship between caffeine consumption and hypertension rates• MacDonald, TM, et al. Caffeine Restriction: effect on mild
hypertension BMJ 1991(303)1235-8• Winkelmayer, WC, et al. Habitual Caffeine Intake and the Risk
of Hypertension in Women. JAMA 2005:(294)18:2330-2335– JNC-7 only mentions caffeine in the context of
abstention 30 minutes before taking a BP reading
Antihypertensive Therapies• Volume Management
– Loop Diuretics – Thiazide Diuretics– Potassium Sparing Diuretics
• Including Aldosterone Antagonists (Aldo Ant)
• RAAS Agents– Angiotensin Converting Enzyme Inhibitors (ACEI)– Angiotensin II Receptor Blockers (ARB)– Renin Inhibitors
• Direct Cardiac Agents– Beta Blockers (BB)– Non-Dihydropyridine Calcium Channel Blockers (Non-DHP CCB)
• Vasodilators– Dihydropyridine Calcium Channel Blockers (DHP CCB)– Alpha 1 Antagonists
Antihypertensive Therapies• Volume Management
– Loop Diuretics – Thiazide Diuretics– Potassium Sparing Diuretics
• Including Aldosterone Antagonists (Aldo Ant)
• RAAS Agents– Angiotensin Converting Enzyme Inhibitors (ACEI)– Angiotensin II Receptor Blockers (ARB)– Renin Inhibitors
• Direct Cardiac Agents– Beta Blockers (BB)– Non-Dihydropyridine Calcium Channel Blockers (Non-DHP CCB)
• Vasodilators– Dihydropyridine Calcium Channel Blockers (DHP CCB)– Alpha 1 Antagonists
Loop Diuretics – Mechanism of ActionSympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
Loop Diuretics – Mechanism of Action
• Act mainly in ascending loop of Henle to decrease sodium reabsorption
• Action is shorter but more intense than other diuretics
• Preferred for edema vs. BP management
Na↑ Ca↑Mg↑ K↑
Thiazide Diuretics – Mechanism of Action
Sympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
Thiazide Diuretics– Mechanism of Action
• Increase urinary excretion
• Works at the distal convoluted renal tubules
• Increase urinary excretion of potassium
• Additional MOA– May cause
peripheral vasodilation, but this is unclear
Na Cl↑+ K↑
Potassium Sparing Diuretics – Mechanism of Action
Sympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
Potassium Sparing Diuretics– Mechanism of Action
• Mild Diuretic Effects
• Usually used for synergistics effects
Na↑ K↓
Antihypertensive Therapies• Volume Management
– Loop Diuretics – Thiazide Diuretics– Potassium Sparing Diuretics
• Including Aldosterone Antagonists (Aldo Ant)
• RAAS Agents– Angiotensin Converting Enzyme Inhibitors (ACEI)– Angiotensin II Receptor Blockers (ARB)– Renin Inhibitors
• Direct Cardiac Agents– Beta Blockers (BB)– Non-Dihydropyridine Calcium Channel Blockers (Non-DHP CCB)
• Vasodilators– Dihydropyridine Calcium Channel Blockers (DHP CCB)– Alpha 1 Antagonists
ACE Inhibitors – Mechanism of ActionSympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
ACE
Angiotensin Receptor Blockers– Mechanism of Action
Sympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
Renin Inhibitors – Mechanism of ActionSympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
Antihypertensive Therapies• Volume Management
– Loop Diuretics – Thiazide Diuretics– Potassium Sparing Diuretics
• Including Aldosterone Antagonists (Aldo Ant)
• RAAS Agents– Angiotensin Converting Enzyme Inhibitors (ACEI)– Angiotensin II Receptor Blockers (ARB)– Renin Inhibitors
• Direct Cardiac Agents– Beta Blockers (BB)– Non-Dihydropyridine Calcium Channel Blockers (Non-DHP CCB)
• Vasodilators– Dihydropyridine Calcium Channel Blockers (DHP CCB)– Alpha 1 Antagonists
Beta Blockers – Mechanism of ActionSympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
Non-DHP CCB– Mechanism of ActionSympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
Antihypertensive Therapies• Volume Management
– Loop Diuretics – Thiazide Diuretics– Potassium Sparing Diuretics
• Including Aldosterone Antagonists (Aldo Ant)
• RAAS Agents– Angiotensin Converting Enzyme Inhibitors (ACEI)– Angiotensin II Receptor Blockers (ARB)– Renin Inhibitors
• Direct Cardiac Agents– Beta Blockers (BB)– Non-Dihydropyridine Calcium Channel Blockers (Non-DHP CCB)
• Vasodilators– Dihydropyridine Calcium Channel Blockers (DHP CCB)– Alpha 1 Antagonists
Alpha Blockers – Mechanism of ActionSympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
DHP CCB– Mechanism of ActionSympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
Antihypertensive Therapies• Volume Management
– Loop Diuretics – Thiazide Diuretics– Potassium Sparing Diuretics
• Including Aldosterone Antagonists (Aldo Ant)
• RAAS Agents– Angiotensin Converting Enzyme Inhibitors (ACEI)– Angiotensin II Receptor Blockers (ARB)– Renin Inhibitors
• Direct Cardiac Agents– Beta Blockers (BB)– Non-Dihydropyridine Calcium Channel Blockers (Non-DHP CCB)
• Vasodilators– Dihydropyridine Calcium Channel Blockers (DHP CCB)– Alpha 1 Antagonists
Initial Evaluation
Goals• Identify target organ damage• Identify secondary causes• Identify other CVD risk factors and assess overall
CVD risk• Identify lifestyle contributory factors• Identify factors or conditions that influence
therapy decisions (contraindications, indications, etc.)
Ideal Antihypertensive Drugs
• Prevents all complications of hypertension (all cause mortality, CVD mortality, CVD events, renal failure, etc.)
• Effective as monotherapy• Favorable quality of life profile• Does not worsen other conditions, safe• Once a day dosing• Inexpensive
Examples Surrogate end
• Blood pressure• Glucose, lipids• Carotid artery thickening• Fasting insulin levels• Hemodynamic effects
Benefits of Drug Therapy
• Pharmacotherapy has been associated with the following benefits:
• 35-40% reduced risk of stroke• 20-25% decrease in MI• > 50% decrease in CHF• Several drug classes are proven to prevent complications,
and a majority of patients will require combination therapy.• However, there are important advantages and
disadvantages of the various drugs and drug classes used to treat hypertension.
Thiazide diuretics
• Place in therapy :“gold standard”.• More recent studies using low doses of
thiazide diuretics have found reductions in all CVD events and they are “virtually unsurpassed” in preventing complications (JNC-7). Overall, they have the strongest body of evidence to support their use as a first line agent.
Antihypertensive and lipid lowering treatment to prevent heart attack trial
ALLHAT • Most robust prospective randomized
controlled clinical trial • Primary end point: Incidence of fatal CHD or
fatal MI• Secondary outcomes were all-cause
mortality , stroke , combined CHD ( fatal CHD, non-fatal MI, Coronary revasularization , or angina with hospitalizations)
ALLHAT: Primary end point
Drug 6-year rate of events (%)
Relative risk (95% CI)
p vs chlorthalidone
Chlorthalidone 11.5 -- --Lisinopril 11.4 0.99
(0.91-1.08)
0.81
Amlodipine 11.3 0.98 (0.90-1.07)
0.65
ALLHAT Cooperative Research Group. JAMA 2002; 288:2981-2997
Secondary outcomes: Amlodipine vs chlorthalidone End point
Amlodipine (%)
Chlorthalidone (%)
Relative risk (95% CI)
p
6-year rate of heart failure
10.2 7.7 1.38 (1.25-1.52)
<0.001
ALLHAT Cooperative Research Group. JAMA 2002; 288:2981-2997
Secondary outcomes: Lisinopril vs chlorthalidone
ALLHAT Cooperative Research Group. JAMA 2002; 288:2981-2997
End point Lisinopril (%)
Chlorthalidone (%)
Relative risk (95% CI)
p
6-year rate of combined CVD
33.3 30.9 1.10 (1.05-1.16)
<0.001
6-year rate of stroke
6.3 5.6 1.15 (1.02-1.30)
0.02
6-year rate of heart failure
8.7 7.7 1.19 (1.07-1.31)
<0.001
Wright JT Jr et al. JAMA 2005; 293:1595-1608.
ALLHAT subgroup analysis: Relative risk of heart failure with amlodipine vs chlorthalidone by race
Comparison Relative risk
95% CI p
Overall 1.37 1.24-1.51 <0.001Blacks 1.46 1.24-1.73 <0.001Nonblacks 1.32 1.17-1.49 <0.001
ALLHAT subgroup analysis: Relative risk of stroke, combined CVD outcomes, and heart failure by race with lisinopril vs
chlorthalidone
Wright JT Jr et al. JAMA 2005; 293:1595-1608.
Comparison Relative risk
95% CI
Stroke •Black participants
1.40 1.17-1.68
•Nonblack participants
1.00 0.85-1.17
Combined CVD •Black 1.19 1.09-1.30•Nonblack 1.06 1.00-1.13Heart failure •Black 1.30 1.10-1.54•Nonblack 1.13 1.00-1.28
ALLHAT
• -The ALLHAT study found no advantage of amlodipine or lisinopril over chlorthalidone in preventing HTN complications in type 2 diabetics or impaired fasting glucose, and chlorthalidone was better at preventing CHF, despite an increased risk of new cases of DM. (Arch Intern Med 2005;165:1401-9.
•
SHEP STUDY
• - The SHEP study found that diabetics received the same benefit as non diabetics from low dose thiazide therapy (JAMA 1996; 276: 1886-92)
• DM Non-DM• CV Events 0.66 0.66• Stroke 0.78(ns) 0.62• CHD Events 0.44 0.81(ns)• Death 0.74(ns) 0.85(ns)
Other Benefits of thiazides include:
• Effective as monotherapy – no tolerance• Once a day• Inexpensive• Adds to the effectiveness of other classes of
antihypertensives• Two epidemiologic studies suggest long-term
thiazide use may reduce the risk of hip fractures• They may be among the best tolerated classes of
antihypertensives
Adverse Effects:
• Increases in lipids and glucose with high dose.• Decreases in K+, Mg++, and Na+.• Increases in uric acid and calcium. • Drug interactions: NSAIDs, corticosteroids, and
lithium.• Contraindicated in GFR<30ml/min
Management of Diuretic Induced Hypokalemia
Prevention• Low doses of diuretic with or without potassium sparing agent.Treatment options:• Discontinue diuretic• High dose potassium chloride if continue diuretic• Add potassium-sparing diuretic if continue diuretic
– Most effective regimen– Spares Mg++ as well– Convenient and inexpensive– Positive outcome data– Triamterene and amiloride have minimal BP lowering effect
_ Spironolactone
Potassium Sparing diuretics
• Is it Okay to empirically start all patients with HTN on fixed doses of combination products to avoid hypokalemia?
KEY counseling points
• Increased urination when starting the medication
• Taking the dose in morning to minimize nocturia
• Signs and Symptoms of hypokalemia• Consumption of K rich foods• Salt substitutes
Loop diuretics
• More potent diuretics• Smaller decrease in PVR , and less vasodilation• Less effective as antihypertensives as
compared to Thiazide diuretics • Diuretics of choice in severe CKD
(GFR<30ml/min)
Summary Slide
ACE inhibitors
• Recommended for all compelling indications • Clearly demonstrated reduction in HTN
related complications • Patients who cannot take or tolerate first line
agents
ACE inhibitors • CHF , Diabetes and CKD have a compelling indication for
ARBS • The overall efficacy appears comparable to thiazides and
CCBs. • They have a higher rate of stroke and lower rate of CHF and
new cases of DM than CCBs. • They also have a higher rate of stroke and lower rate of DM
than diuretics.• Lack metabolic side effects such as lipid or glucose
alterations. Some data suggests ACEI may reduce the onset of DM.
ACE Inhibitors – Dose ConversionsGeneric (Brand) Typical Daily
Dose (Oral) ‡Maximum Daily Dose (Oral) ‡ Frequency
Lisinopril (Prinivil,Zestril)
5-40mg 80mg QD
‡ Typical oral dose for use in Hypertension. Other indications may have differing doses.
All doses are once daily except where noted
ACE Inhibitors – Mechanism of ActionSympathetic Activation
Peripheral Resistance
Cardiac Output
HR StrokeVolume
Renin
AT II
Aldosterone
Blood Pressure
PlasmaVolume
ACE
ACE Inhibitors – Side Effects
• Hypotension• Cough: 5-20% of patients develop a dry non-
productive• Angioedema– 1% in general population– 4% in African Americans– Also less effective in African American as
monotherapy• Hyperkalemia
ACE Inhibitors – Monitoring
• Efficacy– Blood Pressure
• Safety– Chem 7• K+• SCr/BUN
– Angioedema– Cough
Summary slide
Angiotensin Receptor Blockers(ARB)
• Reserve for patients who cannot tolerate an ACEI.
• Evidence to support with Type 2 Diabetes who have diabetic nephropathy with albuminuria
ANGIOTENSIN RECEPTOR BLOCKERS
MECHANISM OF ACTION
RENIN
Angiotensinogen Angiotensin I
ANGIOTENSIN II
ACEOther paths
Vasoconstriction Proliferative Action
Vasodilatation Antiproliferative Action
AT1 AT2
AT1 RECEPTOR BLOCKERS
RECEPTORS
ARB CostsGENERIC BRAND DOSE COST/
YR $Telmisarten MICARDIS 40mg qd 676
Losartan COZAAR 50mg QD 588
Valsartan DIOVAN 160mg qd 647
Irbesartan AVAPRO 150mg qd 542
Olmisartan BENICAR 20mg qd 538
Adverse effects
• Similar to ACEI’s• Angiedema• Both ACE and ARBs contraindicated in
pregnancy and bilateral renal artery stenosis
Summary slide
Calcium channel Blockers(CCB)
• Elderly and Black patients have greater BP reductions
• Used in Combination with diuretics • Do not alter Lipids , glucose or electrolyte
Types of CCB
• Dihyropyridines
• Non-dihydropyridines
Calcium AntagonistsNifedipineNicardipine
Verapamil Diltiazem Isradipine Felodipine Amlodipine
Systemic vasodilation
+++ ++ + +++ +++ +++
Coronary vasodilation
+++ ++ +++ +++ +++ +++
Myocardial contractility
↓/0 ↓↓ ↓ ↓/0 0 0
Heart rate ↑ ↓ ↓ ↑/0 ↑ 0
AV node conduction
0 ↓↓ ↓ 0 0 0
Calcium Antagonists CostsGENERIC BRAND DOSE COST/YR
$diltiazem ER DILTIA XT
DILACOR XR240mg qd
257
verapamil SR CALAN SR 240mg qd 142
verapamil ER COVERA HS 240mg qd 268
Nifedipine ER ADALAT CC 60mg qd 563
felodipine ER PLENDIL 5mg qd 312
amlodipine NORVASC 5mg qd 110
diltiazem ER CARDIZEM CD
240mg qd 432
nifedipine ER PROCARDIA XL
60mg qd 545
CCB
• Recommended to treat HTN in patients with diabetes
• Nondihyropyridines CCB slow the progression of CKD
• Add on therapy after an ACEI or ARB and thaizide diuretic
• Additional anti -ischemic effects with BB or when alternatives to BB are needed
Adverse effects
• Dihydopyridines (nifedipine, nicardipine, isradipine, amlodipine and felodipine): headache, dizziness, flushing, peripheral edema, and reflex tachycardia.
• Verapamil – constipation, dizziness, fatigue, peripheral edema, heart failure and depressed
A-V conduction.
• Diltiazem—similar to verapamil but less likely to cause constipation
Beta Blockers
• All the approved beta blockers for hypertension appear to have similar effectiveness in lowering BP.
• Long-term studies have shown that beta blockers can reduce the morbidity and mortality from hypertension, notably stroke and CHF.
• Beta-blockers are effective for treating other conditions including certain tachyarrhythmia’s and migraine prophylaxis
Beta blockers
• Several studies suggest beta blocker based regimens increase the risk of new onset diabetes (especially when combined with thiazides) as compared to other drug classes (Lancet 2005;366:895-906).
Beta –Blockers • However, meta-analyses suggest that beta-blockers may
be less effective as compared to other antihypertensive drugs in older patients when used as initial therapy for primary prevention (Lancet 2005;366:1545-53, CMAJ 2006;174:1737-42).
• Based on the above, beta-blockers are not recommended as a first-line agents in older patients without another indication for beta-blocker use. They also are not the best control treatment in hypertension primary prevention clinical trials.
Beta blockers
• Use post-myocardial infarction has demonstrated clear benefit in reducing fatal and non-fatal recurrent MIs (for non-ISA beta blockers and acebutolol). Strong clinical benefit has also been demonstrated for patients with CHF and angina
Beta Blockers
DrugCardiosele
ctivity ISA
Alpha-
Blockers
Water Solubi
lity
Lipid Solubi
lityBioavailability
T ½ (Hour
s)Atenolol + - - + - 50 6-9Nadolol - - - + - 40 17-22Acebutolol
+ + - + + 40 3-6
Pindolol - +++ - + + 90 2-5Metoprolol
+ - - + + 40 3-4
Timolol - - - + + 75 2-5Labetolol - - + - + 40 3-4Propranolol
- - - - + 30 2-5
ISA = intrinsic sympathomimetic activity: T ½ = elimination half-life.
Beta-Blockers
• Reduce morbidity and mortality in patient with compelling indication s
• (LVD, CAD and diabetes)• Elderly and black patients may have less BP
control with BB
Beta Blocker CostsGENERIC BRAND DOSE COST/YR
$atenolol TENORMIN 50mg qd 46
propranolol INDERAL 80mg bid 76
metoprolol LOPRESSOR 50mg bid 59pindolol VISKIN 10mg bid 111
acebutolol SECTRAL 400mg qd 200
labetalol NORMODYNE 200mg bid 201
nadolol CORGARD 80mg qd 190
metoprolol ext. rel. TOPROL XL 100mg qd 410
carvedilol Coreg 12.5mg bid 1249
Which BB should be used?
• Selective vs non –selective • Intrinsic sympathomatic activity • Lipid solubility • Comorbidities
Side effects
• fatigue • Depression • Metabolic side effects • Hypogycemia
Beta-Blockers
• These agents can cause problems for patients with asthma, COPD, heart block, brittle diabetes, and peripheral vascular disease (nonCS) and may worsen the lipid profile short-term (decrease HDL, increase TG-non ISA beta blockers
Monitoring
• HR ( no less than 60beats/min ) • Glucose /lipids • Discontinuation • Exercise intolerance, fatigue, insomnia, cold
extremities can occur. Postural hypotension with labetalol due to alpha-blocking effects.
Suggestions for selecting pharmacotherapy factoring in Cost
Condition/Status First Choice Alternate CommentsHypertension without compelling indication
Low dose chlorthalidone or HCTZ or
Amlodipine or ACEI British guidelines recommend ACEI if age < 55 and diuretic or CCB age 55+
African American Low dose chlorthalidone or HCTZ
Amlodipine if at risk for diabetes ACEI not recommended for initial therapy but can be used as add on therapy
Isolated systolic hypertension Low dose chlorthalidone or HCTZ or amlodipine
ARB Beta-blockers are not recommended for initial therapy
CHF ACEI + beta-blockers +/- spironolactone (severe CHF)
ARB if ACEI cough or angioedema
Diuretics usually needed as additive therapy
Prior MI Beta-blockers + ACEIAngina Beta Blockers or CCB Consider adding ACEI to
decrease CVD riskNephropathy (diabetic and nondiabetic)
ACEI ARB if ACEI cough or angioedema
Diuretics often needed as additive therapy. Goal BP < 130/80
Diabetes without nephropathy ACEI or thiazide or amlodipine
ARB if ACEI cough or angioedema. Beta-blocker can be used if first line agents can’t be used.
Combination therapy often required. Goal BP < 130/80. Some guidelines recommend ACEI
Post-stroke Thiazide + ACEI Not much data to guide selection of alternative regimens
Stage 2 hypertension Thiazide + ACEI orACEI + CCB
ARB can replace ACEI if intolerance to cough or angioedema.
Combination therapy is usually required.
Wiysonge CS et al. Cochrane Database Syst Rev 2007;1:CD002003.
Relative risk of all-cause mortality for beta blockers vs placebo or other treatments
Comparative drug
RR of all-cause mortality for beta blockers
95% CI
Placebo 0.99 0.88–1.11Diuretics 1.04 0.91–1.19ACE inhibitors/ARBs
1.10 0.98–1.24
Calcium blockers
1.07 1.00–1.14
Wiysonge CS et al. Cochrane Database Syst Rev 2007;1:CD002003.
Relative risk of total cardiovascular disease for beta blockers vs placebo or other treatments
Comparative drug
RR of total CV disease for beta blockers
95% CI
Placebo 0.88 0.79–0.97Diuretics 1.13 0.99–1.13ACE inhibitors/ARBs
1.00 0.72–1.38
Calcium blockers
1.18 1.08–1.29
Wiysonge CS et al. Cochrane Database Syst Rev 2007;1:CD002003.
Relative risk of stroke for beta blockers vs placebo or other treatments
Comparative drug
RR of stroke for beta blockers
95% CI
Placebo 0.80 0.66–0.96Diuretics 1.17 0.65–2.09ACE inhibitors/ARBs
1.30 1.11–1.53
Calcium blockers
1.24 1.11–1.40
Wiysonge CS et al. Cochrane Database Syst Rev 2007;1:CD002003.
Relative risk of discontinuing treatment for beta blockers vs placebo or other treatments
Comparative drug
RR of stopping treatment for beta blockers
95% CI
Placebo 2.34 0.84–6.52Diuretics 1.86 1.39–2.50ACE inhibitors/ARBs
1.41 1.29–1.54
Calcium blockers
1.20 0.71–2.04