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Heart Failure

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Cardinal manifestations of heart failure include dyspnea, fatigue and fluid retention ... Stage B: Asymptomatic but have signs of structural heart damage ... – PowerPoint PPT presentation

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Title: Heart Failure


1
Heart Failure
  • Final common pathway for many cardiovascular
    diseases whose natural history results in
    symptomatic or asymptomatic left ventricular
    dysfunction
  • Cardinal manifestations of heart failure include
    dyspnea, fatigue and fluid retention
  • Risk of death is 5-10 annually in patients with
    mild symptoms and increases to as high as 30-40
    annually in patients with advanced disease

2
Main causes
  • Coronary artery disease
  • Hypertension
  • Valvular heart disease
  • Cardiomyopathy
  • Cor pulmonale

3
Compensatory changes in heart failure
  • Activation of SNS
  • Activation of RAS
  • Increased heart rate
  • Release of ADH
  • Release of atrial natriuretic peptide
  • Chamber enlargement
  • Myocardial hypertrophy

4
NYHA Classification of heart failure
  • Class I No limitation of physical activity
  • Class II Slight limitation of physical activity
  • Class III Marked limitation of physical activity
  • Class IV Unable to carry out physical activity
    without discomfort

5
New classification of heart failure
  • Stage A Asymptomatic with no heart damage but
    have risk factors for heart failure
  • Stage B Asymptomatic but have signs of
    structural heart damage
  • Stage C Have symptoms and heart damage
  • Stage D Endstage disease
  • ACC/AHA guidelines, 2001

6
Types of heart failure
  • Diastolic dysfunction or diastolic heart failure
  • Systolic dysfunction or systolic heart failure

7
Factors aggravating heart failure
  • Myocardial ischemia or infarct
  • Dietary sodium excess
  • Excess fluid intake
  • Medication noncompliance
  • Arrhythmias
  • Intercurrent illness (eg infection)
  • Conditions associated with increased metabolic
    demand (eg pregnancy, thyrotoxicosis, excessive
    physical activity)
  • Administration of drug with negative inotropic
    properties or fluid retaining properties (e.
    NSAIDs, corticosteroids)
  • Alcohol

8
Goals of treatment
  • To improve symptoms and quality of life
  • To decrease likelihood of disease progression
  • To reduce the risk of death and need for
    hospitalisation

9
Approach to the Patient with Heart Failure
  • Assessment of LV function (echocardiogram,
    radionuclide ventriculogram)

EF
Assessment of volume status
Signs and symptoms of fluid retention
No signs and symptoms of fluid retention
Diuretic (titrate to euvolemic state)
ACE Inhibitor
Digoxin
b-blocker
10
(No Transcript)
11
Effects of SNS Activation in Heart Failure
  • Dysfunction/death of cardiac myocytes
  • Provokes myocardial ischemia
  • Provokes arrhythmias
  • Impairs cardiac performance
  • These effects are mediated via stimulation
  • of b and a1 receptors
  • Am J Hypertens 1998 11 23S-37S

12
(No Transcript)
13
Carvedilol in Heart Failure
  • Effective receptor-blockade approach to heart
    failure
  • Negative inotropic effect counteracted by
    vasodilation
  • Provides anti-proliferative, anti-arrhythmic
    activity and inhibition of apoptosis
  • Prevents renin secretion
  • Drugs of Today 1998 34 (Suppl B) 1-23.

14
US Multicenter Program
Placebo Carvedilol Risk (n398) (n696) Redu
ction All-cause 31 22 65 mortality (7.8) (3.2)
Death due to progressive 13 5 heart failure
(3.3) (0.7) Sudden death 15 12 (3.8) (1.7)
Risk of hospitalization for 78 78 27 cardiovascu
lar reasons (19.6) (14.1) Combined risk
of 98 110 38 mortality hospitalization (25) (1
6)
NEJM 1996 3341349-1355
15
ANZ Multicentre Heart Failure Trial
Placebo Carvedilol Risk (n208) (n207) Reduct
ion All-cause 26 20 24 mortality (12.5) (10) Ri
sk of hospitalization for 84 64 28 cardiovascular
reasons (40) (31) Combined risk
of 97 74 29 mortality hospitalization (47) (36
)
Lancet 1997 349 375-380.
16
Effect of carvedilol on progression of congestive
heart failure
All randomized
patients Endpoint Placebo Carvedilol
(n134) (n232) Primary endpoint 28 (21) 25
(11) Death due to CHF 4 (3) 0
(0) Hospitalization due to worsening CHF 8
(6) 9 (4) Increase in CHF medication 16
(12) 16 (7) Placebo vs. carvedilol, p
0.008 Drugs of Today 1998 34 (Suppl B) 1-23.
17
COPERNICUS Effect on Mortality
35
Mortality ()
22nd Congress of European Society of Cardiology,
August 2000
18
COPERNICUS Mortality reduction in special
patient groups with carvedilol
EF prior year for worsening heart failure
EFprior to study entry
Mortality reduction ()
22nd Congress of European Society of Cardiology,
August 2000
19
Carvedilol vs. Metoprolol
Change in LVEF () from baseline
Circulation 2000 102 546-551
20
Dosage guidelines for Carvedilol in heart failure
  • Patient selection
  • Stable on background medications (diuretics,
    digoxin and/or ACE inhibitors)
  • Not in a fluid-overload state
  • Not hypotensive

2 weeks
3.125 mg bid
Doubled every 2 weeks
Max dose 25 mg bid (85 kg)
  • Before dose increase
  • Evaluate for
  • Worsening heart failure
  • Vasodilation
  • Bradycardia
  • After each new dose initiation
  • Observe for signs of dizziness or light
    headedness for one hour

21
Management of Complications
  • Transient worsening of heart failure (e.g.
    increasing dyspnea,
  • decreasing exercise capacity)
  • Increase dose of diuretic and/or ACE inhibitor
  • If necessary, reduce carvedilol dose and/or
    prolong titration interval
  • Search for other possible causes (e.g. thyroid
    malfunction, infection, non-compliant drug
    intake, excessive liquid intake, etc.)
  • Vasodilatory Symptoms (dizziness, light
    headedness,
  • symptomatic hypotension)
  • Decrease diuretic dose and, if necessary, ACE
    inhibitor dose
  • If the cessation of both is not successful,
    reduce carvedilol dose and/or prolong titration
    interval

22
Management of Complications (Contd.)
  • Bradycardia (Pulse rate below 55 beats/min)
  • Check and eventually reduce digitalis dose
  • If necessary, reduce carvedilol dose and/or
    prolong titration interval
  • Withdraw carvedilol only in the event that
    hemodynamics are affected
  • Symptoms of Bronchial obstruction
  • Search for other possible causes (e.g.,
    concurrent infection, subacute pulmonary edema)
  • Reduce dose of, or withdraw, carvedilol only
    after possible causes for symptoms have been
    ruled out

23
The role of angiotensin II in the progression of
heart failure
Coronary artery disease
Cardiac overload
Cardiomyopathy
Left ventricular dysfunction
?
Arterial blood pressure
Renin release

Angiotensin II
Aldosterone release
Inotropy and hypertrophy of
Vasoconstriction
Na and water retention
vascular and cardiac cells


Peripheral organ blood flow
Cardiac remodelling
Left ventricular


Skeletal muscle
Renal
dilation hypertrophy
blood flow
blood flow
Pump failure
Exercise intolerance
Oedema
24
ACE Inhibitors physiologic benefits
  • Arteriovenous Vasodilatation
  • ? pulmonary arterial diastolic pressure
  • ? pulmonary capillary wedge pressure
  • ? left ventricular end-diastolic pressure
  • ? systemic vascular resistance
  • ? systemic blood pressure
  • ? maximal oxygen uptake (MVO2)

25
ACE Inhibitors physiologic benefits
  • ? LV function and cardiac output
  • ? renal, coronary, cerebral blood flow
  • No change in heart rate or myocardial
    contractility
  • no neurohormonal activation
  • resultant diuresis and natriuresis

26
ACE Inhibitors clinical benefits
  • Increases exercise capacity
  • improves functional class
  • attenuation of LV remodeling post MI
  • decrease in the progression of chronic HF
  • decreased hospitalization
  • enhanced quality of life
  • improved survival

27
Asymptomatic Patients
  • Enalapril
  • SOLVD Prevention Trial
  • EF
  • Captopril
  • SAVE, GISSI-3, ISIS-4 Post MI, EF overall mortality, ? re-infarction ?
    hospitalization, ? HF progression

28
Symptomatic Patients
  • Hydralazine Isosorbide dinitrate
  • VHeFT-I ? mortality, improved functional
    class as compared with use of digoxin and
    diuretics VHeFT-II proved less effective than
    enalapril

29
Dosage of ACE inhibitors ATLAS study
  • Low-dose High-dose
  • (2.5-5 mg) (32.5-35mg)
  • Cardiovascular 44.9 42.5
  • mortality
  • All-cause mortality
  • hospitalisation for 83.8
    79.7
  • cardiovascular reason
  • All-cause mortality
  • hospitalisation for 60.4
    55.1
  • heart failure
  • Circulation 19991002312-18

30
AIRE
  • AIRE Study demonstrated efficacy of ramipril on
    mortality and morbidity in CHF post-MI NYHA class
    I-III patients
  • 2006 patients enrolled in a double-blind,randomize
    d, placebo-controlled study
  • 27 reduction in the risk of death
  • 23 decrease in progression to severe / resistant
    heart failure

Lancet. 1993 342821-828
31
Guidelines to ACE Inhibitor Therapy
  • Contraindications
  • Renal artery stenosis
  • Renal insufficiency (relative)
  • Hyperkalemia
  • Arterial hypotension
  • Cough
  • Angioedema
  • Alternatives
  • Hydralazine ISDN, AT-II inhibitor

32
Guidelines to ACE Inhibitor Therapy
  • All patients with symptomatic heart failure and
    those in functional class I with significantly
    reduced left ventricular function should be
    treated with an ACE inhibitor, unless
    contraindicated or not tolerated
  • ACE inhibitors should be continued indefinitely
  • It is important to titrate to the dosage regimen
    used in the clinical trials … in the absence of
    symptoms or adverse effects on end-organ
    perfusion
  • In very severe heart failure, hydralazine and
    nitrates added to ACE inhibitor therapy can
    further improve cardiac output

33
ACE Inhibitor Therapy in Heart Failure
Patients (Ejection Fraction
Systolic Blood Pressure

100-139 mmHg (or recent intense diuresis)
140 mmHg
Lowest Dose, Short-Acting
Usual Starting Dose, Long-or Short-Acting
Intermediate Dose, Long- or Short-Acting
Follow-Up Every 1-2 Weeks
Stable BP and Creatinine Level
Symptomatic Low BP or Rising Creatinine Level
Stop ACE Inhibitor Therapy
Residual Excess Fluid?
Increase ACE Inhibitor Dose Follow-Up Every 1-2
Weeks
Y
N
Stop Diuretic and ACE Inhibitor Therapy
Refer to specialist
Target Dose
Return to Baseline BP and Creatinine Level ?
Resume ACE Inhibitor Titration
N
Y
34
Diuretics
  • Indicated in patients with symptoms of heart
    failure who have evidence of fluid retention
  • Enhance response to other drugs in heart failure
    such as beta-blockers and ACE inhibitors
  • Therapy initiated with low doses followed by
    increments in dosage until urine output increases
    and weight decreases by 0.5-1kg daily

35
Digoxin
  • Enhances LV function, normalizes
    baroreceptor-mediated reflexes and increases
    cardiac output at rest and during exercise
  • Recommended to improve clinical status of
    patients with heart failure due to LV dysfunction
    and should be used in conjunction with diuretics,
    ACE inhibitors and beta-blockers
  • Also recommended in patients with heart failure
    who have atrial fibrillation
  • Digoxin initiated and maintained at a dose of
    0.25 mg daily
  • Adverse effects include cardiac arrhythmias, GI
    symptoms and neurological complaints (eg. visual
    disturbances, confusion)

36
Summary of drug treatment for CHF
  • Asymptomatic Mild to moderate Moderate
  • LV dysfunction CHF to severe CHF
  • ACE inhibitor Digoxin Digoxin
  • Beta blocker Diuretics Diuretics
  • ACE inhibitor ACE inhibitor
  • Beta blocker Beta blocker
  • Spironolactone
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