left heart failure

Question 1

What occurs in left heart failure?

Answer 1

The left ventricle is unable to pump blood to the systemic circulation, leading to less blood supply to peripheral organs and congestion in the lungs.

This results in symptoms such as dyspnea and orthopnea.

Question 2

What are the causes of left heart failure?

Answer 2

• Hypertension
• Valvular diseases

Hypertension makes it difficult for the left ventricle to pump against higher pressure, while valvular diseases impair the outflow tract.

Question 3

What is backward failure in left heart failure?

Answer 3

Blood cannot flow from the lungs to the left side of the heart, causing accumulation in the lungs and pulmonary edema.

This leads to symptoms like dyspnea, orthopnea, and paroxysmal nocturnal dyspnea.

Question 4

What symptoms are associated with backward failure?

Answer 4

• Dyspnea
• Orthopnea
• Paroxysmal nocturnal dyspnea
• Rales/crackles in the airway

Orthopnea can be assessed by how many pillows a patient uses while sleeping.

Question 5

What is forward failure in left heart failure?

Answer 5

Blood cannot flow from the heart to the rest of the body, resulting in decreased perfusion of peripheral tissues.

Symptoms include confusion, dizziness, and cold extremities.

Question 6

What specific symptoms can arise from forward failure?

Answer 6

• Muscle hypoxia
• Heart ischemia
• GIT hypoxia
• CNS hypoxia
• Central cyanosis in late stages

These symptoms reflect the inadequate blood supply to various organs.

Question 7

What clinical findings may indicate left heart failure?

Answer 7

• Gallop rhythm (S3+S4)
• Heart murmurs

These findings can help diagnose the condition during a clinical examination.

Question 8

What is low output failure?

Answer 8

A condition where myocardial damage leads to the heart’s inability to pump sufficient blood.

The mechanisms leading to this include various factors that damage the heart muscle.

Question 9

What is high output failure?

Answer 9

A rare condition where cardiac output is higher than normal due to increased peripheral demand and decreased vascular resistance.

This can occur from vasodilation or arteriovenous shunting.

Question 10

What mechanisms contribute to high output failure?

Answer 10

Elevated diastolic pressure in the left ventricle leads to circulatory overload and pulmonary edema.

The renin-angiotensin-aldosterone system is activated to increase blood pressure.

Question 11

What are some causes of high output failure?

Answer 11

• Chronic and severe anemia
• Large arteriovenous fistula or multiple small arteriovenous shunts
• Hyperthyroidism
• Wet beriberi
• Septic shock

These conditions increase the body’s demand for blood or fluid, leading to high output failure.

Question 12

What treatments can be used for high output failure?

Answer 12

• Diet with low salt intake
• Diuretics
• Treating the initial underlying problem

These treatments aim to alleviate symptoms and address the causes of high output failure.