Heart Failure – Simplified Study Notes
Definition
Heart failure is a condition where the heart cannot pump enough blood to meet the body’s
oxygen and nutrient needs. It may result from the heart’s inability to contract properly
(systolic dysfunction) or fill properly (diastolic dysfunction), leading to decreased cardiac
output and fluid buildup (congestion).
Causes and Related Conditions
Long-term high blood pressure
Coronary artery disease or heart attack
Damaged or stiff heart muscles
Valvular heart disease
Cardiomyopathy (disease of heart muscle)
Key Factors Affecting Cardiac Output
Preload: Blood volume entering the ventricles at the end of diastole
Afterload: Resistance the heart must pump against
Contractility: Strength of heart muscle contraction
Heart rate: Too high or too low can reduce efficiency
Metabolic demand: Increased need for oxygen and nutrients
Types of Heart Failure
Left-Sided Heart Failure
Shortness of breath (especially at night or when lying flat)
Fatigue and weakness
Crackles in the lungs (do not clear with coughing)
Persistent dry cough
Decreased oxygen levels
Nocturia (urination at night due to improved kidney perfusion when resting)
Right-Sided Heart Failure
Swelling in feet, ankles, or abdomen (edema)
Weight gain
Enlarged neck veins (JVD)
Low urine output (oliguria)
Fatigue and shortness of breath
Early Warning Signs
Rapid heart rate (due to activation of the sympathetic system)
Shortness of breath during activity
Reduced exercise tolerance
Fatigue
Nursing Management and Care Tips
Assess regularly: Monitor vital signs, daily weight, fluid intake/output, and respiratory
effort.
Positioning: Keep patient in an upright sitting position to reduce shortness of breath.
Oxygen therapy: Provide supplemental oxygen as prescribed.
Monitor for pulmonary edema: Watch for increasing breathlessness, cough, and
crackles.
Fluid restriction: Limit salt and fluid intake to prevent fluid overload.
Daily weight: A sudden increase may indicate worsening heart failure.
Activity management: Encourage rest periods and gradual activity increases.
Emotional support: Reduce anxiety and stress to decrease oxygen demand.
Common Medications Used
ACE inhibitors – help lower blood pressure and reduce heart strain.
Beta-blockers – slow the heart rate and improve efficiency.
Diuretics – remove excess fluid to ease congestion.
Cardiac glycosides (e.g., digoxin) – improve heart contraction and control rate (monitor
closely for toxicity).
Important Nursing Considerations:
Always check apical pulse before giving digoxin (withhold if <60 bpm).
Observe for digoxin toxicity (nausea, vomiting, visual halos, confusion).
Monitor electrolyte levels — especially potassium, since imbalance can cause dangerous
heart rhythms.
Educate patients about changing positions slowly to prevent dizziness or fainting.
Electrolyte Imbalances to Watch
Low Potassium (Hypokalemia):
May occur with certain diuretics.
Symptoms: muscle cramps, weakness, irregular heartbeat.
Encourage foods rich in potassium (e.g., bananas, oranges, potatoes).
High Potassium (Hyperkalemia):
May occur with potassium-sparing diuretics.
Symptoms: fatigue, muscle twitching, irregular heartbeat.
Avoid potassium supplements or salt substitutes unless prescribed.
Summary
Heart failure is a chronic, progressive condition that requires continuous management.
Early recognition of symptoms, proper medication use, and lifestyle changes such as
reduced salt intake, regular monitoring, and adherence to treatment are essential for
maintaining heart function and preventing complications.
