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Congestive Heart Failure (CHF)

Student study notes from paramedic coursework (2023 to 2024), not medical advice. Verify clinical values against current references and your local protocols.

EMS etiologies

Setting: ER

Congestive heart failure (CHF) is a syndrome resulting from the heart’s inability to pump blood efficiently, either due to impaired filling or reduced ejection of blood. This condition affects the body’s ability to meet its metabolic needs, leading to inadequate circulation. CHF is often caused by underlying conditions that alter the structure or function of the heart, including coronary artery disease, heart attacks, hypertension, atrial fibrillation, valvular heart disease, excessive alcohol consumption, infections, and cardiomyopathy.

CHF can manifest as right-sided, left-sided, or biventricular (both-sided) heart failure:

• Left-sided heart failure leads to a backup of blood into the lungs, causing respiratory symptoms such as shortness of breath, fatigue, and pulmonary edema.
• Right-sided heart failure often results in systemic congestion, leading to peripheral edema, ascites, liver enlargement, and jugular venous distention.
• Biventricular heart failure involves both sides of the heart, presenting with a combination of systemic and pulmonary symptoms.

Clinical Presentation:

The clinical signs and symptoms of CHF vary based on the side of the heart affected:

1. Left-Sided Heart Failure:
   • Symptoms: Shortness of breath (dyspnea), orthopnea (difficulty breathing when lying flat), paroxysmal nocturnal dyspnea (waking up with severe shortness of breath), fatigue, and exercise intolerance.
   • Signs: Pulmonary edema (crackles/rales in the lungs), cyanosis, and a displaced apex beat. Severe cases may involve cyanosis due to oxygen deprivation.
2. Right-Sided Heart Failure:
   • Symptoms: Peripheral swelling (edema), abdominal swelling (ascites), nocturia, and fatigue.
   • Signs: Pitting edema in the legs, jugular venous distention, hepatomegaly (enlarged liver), and splenomegaly (enlarged spleen). Hepatic congestion can lead to liver dysfunction.

Treatment Modalities:

The treatment of CHF depends on the severity of the condition and its underlying cause. The main goals of treatment are to improve cardiac output, manage symptoms, and prevent disease progression. Key treatment modalities include:

1. Lifestyle Modifications:
   • Smoking cessation, regular physical activity, and dietary changes (low sodium diet) are recommended to manage heart failure.
2. Medications:
   • ACE inhibitors, ARBs, or ARNI: Reduce blood pressure and prevent fluid retention by inhibiting the renin-angiotensin system.
   • Beta blockers: Slow the heart rate and reduce the heart’s workload.
   • Diuretics: Help eliminate excess fluid and reduce symptoms of congestion.
   • SGLT2 inhibitors: Improve outcomes by promoting sodium excretion and glucose control.
   • Mineralocorticoid receptor antagonists: Reduce fluid buildup and improve survival rates.
3. Device Therapy:
   • Pacemakers and ICDs (implantable cardioverter-defibrillators): Help regulate abnormal heart rhythms.
   • Cardiac resynchronization therapy (CRT): Synchronizes the contractions of the heart chambers.
   • Ventricular assist devices (VADs): Mechanical pumps used for patients with severe heart failure.
4. Surgical Intervention:
   • In advanced cases, heart transplantation may be considered, particularly for patients unresponsive to other treatments.