Right Heart Failure pathology, Slides of Pathology

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HEART

FAILURE

Name : Payal Arora B.CVT (4th Sem)

Introductio

n

Heart failure is a chronic confition where the heart cannot pump blood efficiently , often categorized by the affected side (lest vs right) Right sided heart failure also known as right ventricular heart failure occurs when the right ventricle is too weak to effectively pump blood into the lungs , causing blood to back up in the veins and fluid to accumulate in the body. Usually due to increased afterload (pulmonary hypertension) , excessive preload or reduced contractility

1. The Core Mechanism The pathophysiology generally stems from three primary issues:

• Pressure Overload: The RV has to push against high resistance in the lungs (e.g., pulmonary hypertension).
• Volume Overload: The RV is filled with too much blood (e.g., valvular regurgitation).
• Myocardial Failure: The RV muscle itself is weakened (e.g., right-sided myocardial infarction).

1. Step- by -Step Pathophysiology  (^) A. Increased Afterload or Decreased Contractility  (^) Most cases of right heart failure are actually caused by left heart failure. When the left side fails, blood backs up into the lungs, increasing pulmonary capillary pressure. This creates pulmonary hypertension, forcing the right ventricle to work harder.  (^) B. Right Ventricular Hypertrophy and Dilation  (^) To compensate for the increased pressure, the RV muscle thickens (hypertrophy). Unlike the thick-walled left ventricle, the RV is thin-walled and designed for low- pressure systems. Over time, it cannot sustain the high-pressure demand and begins to stretch out (dilation).

D. Forward Failure (Reduced Cardiac Output)  (^) If the right side isn't pumping blood into the lungs, the left side doesn't receive enough oxygenated blood to pump to the rest of the body. This leads to:  (^) • Fatigue  (^) • Exercise intolerance  (^) • Low blood pressure in severe cases

Causes of Right Heart Failure (RHF)  The most common causes generally fall into categories of pressure overload, volume overload, or muscle damage. 

• Left-Sided Heart Failure: This is the most common cause. When the left ventricle fails, fluid backs up into the lungs, increasing pressure in the pulmonary arteries. The right ventricle must work harder to push against this pressure and eventually fails.  (^) • Chronic Lung Diseases (Cor Pulmonale): Conditions like COPD, pulmonary fibrosis, or sleep apnea increase resistance in the pulmonary vasculature. 
• Pulmonary Embolism: A sudden blockage (like a blood clot) in the pulmonary artery can cause acute right heart failure due to a sudden spike in pressure.

Symptoms and Clinical Signs  (^) 1. Systemic Congestion  (^) Peripheral Edema: Swelling in the lower extremities (feet, ankles, and legs). This is often "pitting" edema, where pressing the skin leaves an indentation.  (^) Jugular Venous Distension (JVD): The veins in the neck appear swollen or bulging because of increased pressure in the superior vena cava.  (^) Ascites: Accumulation of fluid in the abdominal cavity, leading to bloating and discomfort.  (^) Hepatomegaly (Enlarged Liver): Blood backing up into the hepatic veins causes the liver to become congested and tender.

 (^) 2. Gastrointestinal Symptoms  (^) Anorexia and Nausea: Congestion in the GI tract can lead to a loss of appetite or a feeling of fullness.  (^) Weight Gain: Rapid increase in weight due to fluid retention rather than fat accumulation.  (^) 3. Forward Failure Symptoms  (^) Fatigue and Weakness: Since less blood is reaching the lungs to be oxygenated, the left side of the heart has less oxygen-rich blood to send to the rest of the body.  (^) Exertional Dyspnea: Shortness of breath during physical activity, though this is less common in isolated RHF than in left-sided failure.

 (^) 2. Medical Management  (^) a) Diuretics  (^) First-line for symptom relief  (^) Drugs: Furosemide, Spironolacton  (^) Reduce peripheral edema, ascites, and venous congestion  (^) b) Vasodilators  (^) Reduce pulmonary and systemic pressure  (^) Improve cardiac output  (^) c) Inotropic Agents  (^) Used in severe cases to improve heart contractility  (^) Example: Digoxin

d) Oxygen Therapy

• Important in patients with hypoxia
• Especially in lung-related causes (e.g., COPD) e) Treatment of Underlying Cause
• Left heart failure → treat with standard HF therapy
• Pulmonary hypertension → specific vasodilators
• Valve disease → surgical correction
• Lung disease → bronchodilators, steroids

Evaluation and Management of RHF

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