Chapter 48
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Chapter 48. Drugs for Heart Failure. Two Major Forms of Heart Failure. Heart failure with left ventricular (LV) systolic dysfunction Diastolic heart failure, also known as heart failure with preserved LV ejection fraction

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Chapter 48

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Chapter 48

Chapter 48

Drugs for Heart Failure


Two major forms of heart failure

Two Major Forms of Heart Failure

  • Heart failure with left ventricular (LV) systolic dysfunction

  • Diastolic heart failure, also known as heart failure with preserved LV ejection fraction

    • Note: In this chapter, we will focus primarily on the treatment of form #1


Heart failure

Heart Failure

  • Progressive, often fatal disorder

  • Characterized by left ventricular dysfunction, reduced cardiac output, insufficient tissue perfusion, and signs of fluid retention

  • Affects nearly 5 million Americans


Pathophysiology of heart failure

Pathophysiology of Heart Failure

  • Inadequate tissue perfusion

  • Volume overload

  • Chronic hypertension

  • Myocardial infarction

  • Valvular heart disease

  • Coronary artery disease

  • Congenital heart disease

  • Dysrhythmias

  • Aging of the myocardium


Pathophysiology of heart failure1

Pathophysiology of Heart Failure

  • Cardiac remodeling

  • Physiologic adaptations to reduced cardiac output (CO)

    • Cardiac dilation

    • Increased sympathetic tone

    • Water retention and increased blood volume

    • Natriuretic peptides


Drugs for heart failure

Drugs for Heart Failure

  • Diuretics

  • RAAS inhibitors

    • ACE inhibitors

    • Angiotensin II receptor blockers

    • Aldosterone antagonists

    • Direct renin inhibitors

  • Beta blockers

  • Digoxin

  • Other inotropic agents

  • Other vasodilators


Chapter 48

Fig. 48–2. The vicious cycle of maladaptive compensatory responses to a failing heart.


Chapter 48

Fig. 48–3. American College of Cardiology/American Heart Association (ACC/AHA) Stage

and New York Heart Association (NYHA) Classification of Heart Failure.


Drugs used to treat heart failure

Drugs Used to Treat Heart Failure

  • Diuretics

  • Drugs that inhibit the renin-angiotensin-aldosterone system (RAAS)

  • Beta blockers

  • Digoxin and other cardiac glycosides

  • Inotropic agents (other than cardiac glycosides)

  • Vasodilators:other than ACE inhibitors and angiotensin-receptor blockers (ARBs)


Diuretics

Diuretics

  • Thiazide diuretics

  • High-ceiling (loop) diuretics

  • Potassium-sparing diuretics


Drugs that inhibit the raas

Drugs That Inhibit the RAAS

  • ACE inhibitors

    • Hemodynamic benefits

      • Arteriolar dilation

      • Venous dilation

      • Suppression of aldosterone release

    • Impact on cardiac remodeling

      • ACE inhibitors have favorable impact


Drugs that inhibit the raas1

Drugs That Inhibit the RAAS

  • ACE inhibitors (cont’d)

    • Adverse effects

      • Hypotension

      • Hyperkalemia

      • Intractable cough

      • Angioedema

      • Renal failure if patient has bilateral renal artery stenosis

      • Can cause fetal injury


Drugs that inhibit the raas2

Drugs That Inhibit the RAAS

  • Angiotensin II receptor blockers

    • Clinical trials have shown that ARBs improve LV ejection fraction, reduce HF symptoms, increase exercise tolerance, decrease hospitalization, enhance quality of life, and reduce mortality


Drugs that inhibit the raas3

Drugs That Inhibit the RAAS

  • Aldosterone antagonists

    • Spironolactone (Aldactone) and eplerenone (Inspra)

    • Current studies recommend adding an aldosterone antagonist to standard HF therapy in patients with moderately severe or severe symptoms


Drugs that inhibit the raas4

Drugs That Inhibit the RAAS

  • Direct renin inhibitors

    • Benefits in HF should be equal to those of ACE inhibitors or ARBs

    • Aliskiren (Tekturna) is being tested in HF

    • Not yet approved for HF treatment


Beta blockers

Beta Blockers

  • Action

    • With careful control of dosage, can improve patient status

    • Protect from excessive sympathetic stimulation

    • Protect against dysrhythmias

  • Adverse effects

    • Fluid retention or worsening of HF

    • Fatigue

    • Hypotension

    • Bradycardia or heart block


Digoxin and cardiac glycosides

Digoxin and Cardiac Glycosides

  • Positive inotropic actions

    • Increase myocardial contractile force

    • Alter electrical activity of the heart

    • Favorably affect neurohormonal systems

  • Second-line agents


Inotropic agents

Inotropic Agents

  • Sympathomimetics

    • Dopamine (Intropin)

      • Catecholamine

      • Activates beta1-adrenergic receptors in the heart, kidney, and blood vessels

      • Increases heart rate

      • Dilates renal blood vessels

      • Activates alpha1 receptors


Inotropic agents1

Inotropic Agents

  • Sympathomimetics (cont’d)

    • Dobutamine

      • Synthetic catecholamine

      • Selective activation of beta1-adrenergic receptors

  • Phosphodiesterase inhibitors

    • Inamrinone—inodilator

    • Milrinone (Primacor)


Vasodilators

Vasodilators

  • Isosorbide dinitrate plus hydralazine

  • Intravenous vasodilators for acute care

    • Nitroglycerin

      • Principal adverse effects

        • Hypotension

        • Resultant reflex tachycardia

    • Sodium nitroprusside (Nitropress)

      • Principal adverse effect

        • Profound hypotension

    • Nesiritide (Natrecor)

      • Principal adverse effect

        • Symptomatic hypotension


Cardiac digitalis glycosides

Cardiac (Digitalis) Glycosides

  • Digoxin (Lanoxin, Lanoxicaps, Digitek)

    • Naturally occurring compound

    • Profound effects on the mechanical and electrical properties of the heart

    • Increases myocardial contractility

    • Increased cardiac output

    • Adverse effect

      • Can cause severe dysrhythmias


Digoxin lanoxin

Digoxin (Lanoxin)

  • Effects

    • Positive inotropic action on the heart

    • Increases the force of ventricular contraction

    • Increases myocardial contractility

  • Relationship of potassium to inotropic action

    • Potassium levels must be kept in normal physiologic range

  • Hemodynamic benefits

    • Increased cardiac output

      • Decreased sympathetic tone

      • Increased urine production

      • Decreased renin release


Chapter 48

Fig. 48–4. Ion fluxes across the cardiac cell membrane.


Digoxin lanoxin1

Digoxin (Lanoxin)

  • Neurohormonal benefits

    • Modulates the activity of the neurohormonal system

    • Suppresses renin release in the kidney

    • Decreases sympathetic outflow from the CNS

    • Increases the sensitivity of cardiac baroreceptors

  • Electrical effects

    • Alters the electrical properties of the heart

      • Increases the firing rate of vagal fibers

      • Increases the responsiveness of the SA node to acetylcholine


Digoxin lanoxin2

Digoxin (Lanoxin)

  • Adverse effects

    • Cardiac dysrhythmias

    • Predisposing factors

      • Hypokalemia

      • Elevated digoxin level

        • Narrow therapeutic range

      • Heart disease

    • Diagnosing digoxin-induced dysrhythmias

    • Managing digoxin-induced dysrhythmias


Digoxin lanoxin3

Digoxin (Lanoxin)

  • Adverse effects (cont’d)

    • Noncardiac adverse effects

      • Anorexia, nausea, vomiting, fatigue

    • Measures to reduce adverse effects

      • Education


Digoxin lanoxin4

Digoxin (Lanoxin)

  • Drug interactions

    • Diuretics

    • ACE inhibitors and ARBs

    • Sympathomimetics

    • Quinidine

    • Verapamil

  • Pharmacokinetics

    • Absorption

    • Distributed widely and crosses the placenta

    • Eliminated primarily by renal excretion

    • Half-life about 1.5 days


Management of heart failure

Management of Heart Failure

  • Stage A

    • No symptoms of HF

    • No structural or functional cardiac abnormalities

    • Hypertension, CAD, diabetes, family history of cardiomyopathy, personal history of alcohol abuse, rheumatic fever, or treatment with a cardiotoxic drug (eg, doxorubicin, trastuzumab)

    • Management directed at reducing risk


Management of heart failure1

Management of Heart Failure

  • Stage B

    • No signs and symptoms of HF

    • Goal of management is to prevent development of symptomatic HF

    • Treatment is the same as for stage A with the addition of ACE inhibitors or ARBs


Management of heart failure2

Management of Heart Failure

  • Stage C

    • Symptoms of HF

    • Structural heart disease

    • Four major goals

      • Relieve pulmonary and peripheral congestive symptoms

      • Improve functional capacity and quality of life

      • Slow cardiac remodeling and progression of LV dysfunction

      • Prolong life


Management of heart failure3

Management of Heart Failure

  • Stage C (cont’d)

    • Drug therapy

      • Diuretics

      • ACE inhibitors and ARBs

      • Aldosterone antagonists

      • Beta blockers

      • Digoxin

      • Isosorbide dinitrate/hydralazine

    • Drugs to avoid

      • Antidysrhythmic agents

      • Calcium channel blockers

      • NSAIDs


Management of heart failure4

Management of Heart Failure

  • Stage C (cont’d)

    • Device therapy

      • Implanted cardioverter-defibrillators

      • Cardiac resynchronization

    • Exercise training

    • Evaluating treatment

      • Based on symptoms and physical findings


Management of heart failure5

Management of Heart Failure

  • Stage D

    • Marked symptoms of HF

    • Advanced structural heart disease

    • Repeated hospitalizations

    • Best solution is a heart transplant

      • LV mechanical assist device used until heart is available

    • Management

      • Control of fluid retention

        • Loop diuretic, thiazide diuretic

        • Dopamine, dobutamine

      • Beta blockers pose high risk for worsening HF


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