Heart Failure
What are the different types of heart failure?
Heart failure is a clinical syndrome that can be classified into several types based on the function of the heart, the side of the heart involved, or the underlying cause. Here’s a breakdown of the main types:
1. Based on Ejection Fraction (EF)
🟦 Heart Failure with Reduced Ejection Fraction (HFrEF)
- Definition: EF ≤ 40%
- Cause: Often due to weakened heart muscle from conditions like coronary artery disease or myocardial infarction.
- Symptoms: Fatigue, shortness of breath, fluid retention.
- Also known as: Systolic heart failure.
🟩 Heart Failure with Preserved Ejection Fraction (HFpEF)
- Definition: EF ≥ 50%
- Cause: Often related to stiff heart muscle, common in elderly, hypertensive, or diabetic patients.
- Symptoms: Similar to HFrEF.
- Also known as: Diastolic heart failure.
🟨 Heart Failure with Mid-Range Ejection Fraction (HFmrEF)
- Definition: EF between 41–49%
- Considered: An intermediate phenotype with characteristics of both HFrEF and HFpEF.
2. Based on the Side of the Heart Involved
🔴 Left-Sided Heart Failure
- Most common type.
- Symptoms: Pulmonary symptoms like shortness of breath, orthopnea, and pulmonary edema.
- Can be systolic or diastolic.
🔵 Right-Sided Heart Failure
- Often a consequence of left-sided failure or pulmonary hypertension.
- Symptoms: Peripheral edema, ascites, hepatomegaly, jugular venous distension.
3. Based on Output
🔺 High-Output Heart Failure
- Rare; occurs when cardiac output is elevated but still insufficient for metabolic demands.
- Causes: Severe anemia, hyperthyroidism, arteriovenous fistulas, beriberi.
- Heart is not weak, but overwhelmed.
🔻 Low-Output Heart Failure
- More common.
- Heart cannot pump enough blood to meet body’s needs.
4. Acute vs Chronic
🆘 Acute Heart Failure
- Sudden onset or rapid worsening.
- Often a medical emergency (e.g., pulmonary edema).
- Can be new (de novo) or worsening of chronic heart failure.
♻️ Chronic Heart Failure
- Develops over time.
- Patients often adapt somewhat to symptoms.
- Requires long-term management.
