Diseases

Heart failure treatment guidelines

overview I classification I sign and symptoms I complications I Pathophysiologic changes in heart failure I Investigations I Treatments

This is a topic on Heart failure treatment guidelines. Heart failure is a clinical condition when the heart cannot maintain an adequate cardiac output or can do so only at the expense of elevated filling pressure. In mild to moderate forms of heart failure, symptoms occur when the metabolic demand increases during exercise or some other form of stress.  In severe heart failure, symptoms may be present at rest. In clinical practice, heart failure may be diagnosed when a patient with significant heart disease develops the signs or symptoms of low cardiac output, pulmonary congestion or systematic venous congestion at rest or on exercise.

Classification

A)    According to the ventricular involvement:

1)    Left heart failure: Common causes are an acute myocardial infarction (MI), hypertension, aortic valvular disease.

2)    Right-sided heart failure: causes of isolated right heart failure includes

  • Chronic lung disease (cor pulmonale)
  • Pulmonary embolism and
  • Pulmonary valvular stenosis

3)    Biventricular heart failure

B)    Forward and backward heart failure:

1)    Forward failure: the predominant problem is an inadequate cardiac output.

2)    Backward failure: patients may have a normal or near-normal cardiac output with marked salt and water retention causing pulmonary and systematic venous congestion.

C)    Diastolic and systolic dysfunction:

1)    Systolic dysfunction: heart failure may develop as a result of impaired myocardial contraction.

2)    2) diastolic dysfunction: heart failure due to poor ventricular filling and high filling pressure caused by abnormal ventricular relaxation.

D)    High-output failure: conditions that are associated with a very high cardiac output

(e.g. a large arterio-venous shunt. Beriberi, severe anemia or thyrotoxicosis) can occasionally cause heart failure.

E)    Acute and chronic heart failure:

1)    Acute heart failure: as in myocardial infarction

2)    Chronic heart failure: as in progressive valvular heart disease.

New York Heart Association (NYHA) classification:

Class Criteria
Class I No limitation. Normal physical exercise does not cause fatigue,
dyspnoeas or palpations.
Class IIMild limitation. comfortable at rest, but normal physical
activity produces fatigue, dyspnoeas or palpations.
Class IIIMarked limitation. comfortable at rest, but less gentle physical
activity produces a marked symptom of heart failure.
Class IVIn this class symptoms of heart failure occur at rest and are
exacerbated by physical activity.

Sign and symptoms

  • Shortness of breath (dyspnoea)
  • Fatigue and weakness
  • Swelling (edema) in leg, ankle, and  feet
  • Rapid or irregular heartbeat
  • Persistence cough
  • Orthopnoea
  • Pro station
  • Auscultation of heart: a ‘gallop’ rhythm, with a third heart sound.
  • Auscultation of the lungs: bilateral basal crepitations.

Complications of heart failure

1.    Renal failure: caused by poor renal perfusion due to low cardiac output and may be exacerbated by diuretic therapy, ACE inhibitors, and angiotensin receptor blockers.

2.    Hypokalaemia: a result of treatment with potassium-losing diuretics or hyperaldosteronism caused by activation of the renin-angiotensin system and impaired aldosterone metabolism due to hepatic congestion.

3.    Hyperkalemia: due to effects of drug treatment, particularly the com combination of angiotensin in converting enzymes (ACE) inhibitors and spironolactone (which both promote potassium retention), and renal dysfunction.

4.    Hyponatraemia: caused by diuretic therapy, inappropriate water retention due to high ADH secretion, or failure of the cell membrane ion pump.

5.    Impaired liver function: caused by

  • Hepatic venous congestion
  • Poor arterial perfusion

6) thromboembolism: due to the effects of a low cardiac and enforced immobility.

7) atrial and ventricular arrhythmias

8) sudden death

Factor that may precipitate heart failure or aggravate heart failure

Factor that may precipitate or aggravate heart failure in patients with pre-existing heart diseases:

  1. Myocardial ischemia or infarction
  2. Intercurrent illness (eg. Infection)
  3. Arrhythmia, eg. Atrial fibrillation
  4. Inappropriate reduction of therapy
  5. Administration of a drug with negative inotropic properties (e.g. β-blocker) or fluid-retaining properties (e.g. Non-steroidal anti-inflammatory drugs (NSAIDS), corticosteroids).
  6. Pulmonary embolism
  7. The condition associated with increased metabolic demand e.g. pregnancy, thyrotoxicosis, anemia
  8. Intravenous fluid overload, e.g post-operative I/V infusion.

Pathophysiologic changes in heart failure

  • Ventricular dilation
  • Myocyte hypertrophy
  • Increased collagen synthesis
  • Altered myosin gene expression
  • Altered sarcoplasmic calcium- ATPase density
  • Increased ANP secretion
  • Sympathetic stimulation
  • Peripheral vasoconstriction

Investigations

  1. ECG: features of MI, ischemia, LVH, etc
  2. Chest x-ray P/A view: pulmonary edema, cardiomegaly
  3. Echocardiography
  4. Blood test: serum creatinine, blood ureas, electrolytes, full blood count, cardiac enzymes, CRP, blood glucose level.

Treatment

Treatment of acute left heart failure/ acute left ventricular failure

  1. The position of the patient: sitting up (propped up), in order to reduce pulmonary congestion.
  2. Oxygen: high flow, high concentration.
  3. Continuous positive airway pressure,
  4. Nitrates: the patient should be given IV glyceryl trinitrate 10-200 µg/min or buccal glyceryl trinitrate 1-5 mg titrated upwards every 10 minutes until clinical improvement occurs or systolic blood pressure  of the patient falls to 110 mmHg
  5. Loop diuretic: furosemide 50-100 mg IV.
  6. Intravenous opiates: may be cautiously used when patients are in extremis (morphine/pethidin=anti-emetic).
  7. If these measures prove ineffective, inotropic agents may be required to augment cardiac output, particularly in hypotensive patients.
  8. Insertion of an intra-aortic balloon pump may be beneficial in patients with acute cardiogenic pulmonary edema and shock.

Chronic heart failure

General management

  • Education
  • Salt and water retention
  • Avoidance of smoking and alcohol
  • Regular exercise within a limit

Drugs

  • Diuretics: loop diuretic and a potassium-sparing diuretic
  • ACE inhibitors or ARB
  • Neprilysin inhibitors e.g. sacubitril
  • Beta-blockers
  • Digoxin
  • Ivabradine

Non-pharmacological treatments:

  • Implantable cardiac defibrillators.
  • Resynchronixation devices
  • Coronary revascularization
  • Cardiac transplantation
  • Ventricular assisted devices.

Biventricular failure/ congestive cardiac failure (CCF)

A)    General measures

  • Education: in this, explanation of nature of the disease, treatment, and self-help strategies
  • Diet: good general nutrition and reduction of the obese. Avoidance of high-salts food and added salt.
  • Alcohol: moderate or eliminate alcohol consumption
  • Stop smoking
  • Exercise: regular moderate aerobic exercise within in limits of symptoms.
  • Vaccination: influenza and pnuemococcal vaccination should be considered

B)  Drug therapy:

  • Diuretics: these are usually the first line treatment.
  • Vasodilators: arterial dilator (eg. Hydralazine) reduce afterload.
  • Angiotensin-converting enzyme (ACE) inhibitors
  • Angiotensin receptor blockers: Examples include losartan 50-100 mg once daily, candesartan 4-16 mg daily or valsartan 40-160 mg daily.
  • Beta-adrenoceptor antagonists (blockers): bisoprolol started at a dose of 1.25 mg daily, and increased gradually over a 12-week period to a target maintenance dose of 10 mg daily.
  • Digoxin
  • Amiodarone: effective in the treatment of symptomatic arrhythmia.
  • Neprilysin inhibitors e.g. sacubitril
  • Ivabradine

c)    Implantable cardiac defribillators

d)    Resynchronization devices

e)    Revascularisation:

  • Coronary artery bypass surgery
  • Percutaneous coronary intervention

F)  Heart transplantation (intractable heart failure):

  • Coronary artery disease
  • Dilated cardiomyopathy

G) Ventricular assisted devices

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button
Close