Congestive Heart Failure (CHF) Overview and Practice Questions

Congestive Heart Failure (CHF): An Overview (2023)

by | Updated: Nov 8, 2023

Congestive heart failure (CHF) is a serious medical condition that affects millions of people worldwide.

It occurs when the heart’s ability to pump blood is impaired, leading to a buildup of fluid in the body and a range of debilitating symptoms.

In this article, we will delve into the essential aspects of CHF, including its causes, symptoms, diagnosis, and management, shedding light on the importance of early detection and proper medical care.

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What is Congestive Heart Failure?

Congestive heart failure (CHF) is a chronic condition where the heart can’t pump blood effectively enough to meet the body’s needs. It can result from damaged heart tissue, often due to heart disease or a heart attack, leading to symptoms like fatigue, shortness of breath, and fluid buildup.

Congestive Heart Failure Illustration Infographic


Congestive heart failure can be caused by a variety of conditions that damage the heart muscle, including:

  • Coronary artery disease: Narrowed arteries limit the heart’s supply of oxygen-rich blood, leading to weakened heart tissue.
  • Heart attack: This may cause irreversible damage to the heart muscle, affecting its pumping ability.
  • High blood pressure (hypertension): The heart has to work harder than normal, which can enlarge and weaken it over time.
  • Faulty heart valves: Damaged or diseased valves can force the heart to work harder to keep blood flowing as it should, which can lead to heart failure.
  • Cardiomyopathy: Diseases of the heart muscle itself can lead to heart failure.
  • Myocarditis: Inflammation of the heart muscle, often due to infection, can affect the heart’s ability to pump.
  • Congenital heart defects: Structural heart defects present from birth can lead to heart failure.
  • Arrhythmias: Abnormal heart rhythms can cause the heart to beat too fast, creating extra work for it.
  • Chronic diseases: Conditions such as diabetes, HIV, hyperthyroidism, hypothyroidism, or a buildup of iron (hemochromatosis) or protein (amyloidosis) can contribute to heart failure.

Note: Managing the underlying causes and reducing risk factors are key to preventing or delaying the onset of heart failure.

Signs and Symptoms

The signs and symptoms of congestive heart failure can include:

  • Shortness of breath
  • Fluid overload
  • Orthopnea
  • Hypoxemia
  • Fatigue and weakness
  • Peripheral edema
  • Jugular venous distention (JVD)
  • Rapid or irregular heartbeat
  • Tachypnea
  • Diaphoresis
  • Persistent cough
  • Wheezing
  • Ascites
  • Coughing up pink, frothy mucus
  • Cyanosis

Note: These symptoms result from the heart’s inability to pump blood efficiently, leading to a buildup of fluid in the lungs and other tissues. Symptoms can range from mild to severe and may become more pronounced as the condition progresses.


Diagnosing congestive heart failure typically involves a combination of patient history, physical examination, and diagnostic tests.

The process may include:

  • Patient History: Discussing symptoms and medical history.
  • Physical Exam: Looking for signs like fluid buildup, irregular heartbeat, and abnormal sounds in the heart and lungs.
  • Echocardiogram: An ultrasound of the heart to assess its function and structure.
  • Electrocardiogram (EKG): Recording the heart’s electrical activity to identify irregular rhythms.
  • Blood tests: Checking for markers of heart failure like BNP (B-type natriuretic peptide) and other conditions that might cause similar symptoms.
  • Imaging Tests: Chest x-rays help visualize the size of the heart and check for fluid in the lungs. MRI or CT scans provide detailed images of the heart’s structure.
  • Stress Test: Assessing how the heart performs under physical stress.
  • Hemodynamic Monitoring: Measures blood pressure and flow within the circulatory system to assess the heart’s function and fluid balance.
  • Cardiac Catheterization: Invasive procedure to check for blockages in the coronary arteries.
  • Coronary Angiogram: Using dye and X-rays to show the inside of the coronary arteries.

Note: These diagnostic tools help determine the presence and severity of heart failure and guide appropriate treatment strategies.


Treatment for congestive heart failure often involves a combination of medication, lifestyle changes, and potentially surgical interventions, with the goals of improving symptoms, slowing disease progression, and reducing the risk of complications:

  • Medications: ACE inhibitors or ARBs to lower blood pressure and reduce heart strain, beta-blockers to slow the heart rate and reduce blood pressure, diuretics to reduce fluid retention and swelling, Aldosterone antagonists to assist with heart function and reduce fluid buildup, Digoxin to strengthen heart contractions, and SGLT2 inhibitors that have been shown to help manage heart failure.
  • Lifestyle Changes: Diet modifications, like reducing salt intake to prevent fluid retention, regular physical activity as advised by a healthcare provider, weight management to reduce the burden on the heart, smoking cessation and limiting alcohol intake, and monitoring and managing stress.
  • Surgical and Device-Based Therapies: Implantable cardioverter-defibrillators (ICDs) to prevent life-threatening arrhythmias, cardiac resynchronization therapy (CRT) or biventricular pacing to help the chambers of the heart pump more efficiently, ventricular assist devices (VADs) to aid the pumping function of the heart, and heart transplants in severe cases where other treatments have failed.
  • Respiratory Therapy: Oxygen therapy is typically indicated to treat or prevent hypoxemia. Noninvasive ventilation (NIV) is often required, especially if pulmonary edema has developed. If the patient continues to deteriorate while on NIV, intubation and mechanical ventilation would be indicated to prevent respiratory failure.

Patient education on managing heart failure and recognizing the signs of worsening heart failure is also crucial.

Treatment plans are highly individualized based on the cause of heart failure, the severity of symptoms, and the presence of other medical conditions.

Congestive Heart Failure Practice Questions

1. What is the definition of congestive heart failure?
Congestive heart failure (CHF) is a chronic progressive condition where the heart muscle weakens and loses the ability to pump blood effectively, leading to symptoms such as shortness of breath, edema, and fatigue.

2. What occurs with a normal heart?
The heart pumps enough blood to match the body’s need for oxygen.

3. In congestive heart failure, the heart is unable to what?
To move as much blood as it should with each beat.

4. Congested heart failure is typically associated with what respiratory disorder?
Pulmonary edema

5. What are the two most common causes of left-sided heart failure?
Myocardial Infraction and hypertension

6. What are the forward effects of left-sided congestive heart failure?
The left ventricle is unable to pump blood effectively, which causes decreased cardiac output, tissue perfusion, and tissue hypoxia.

7. What are the backward effects of left-sided congestive heart failure?
Blood coming into the left ventricle cannot be pumped forward; therefore, blood backs up in the lungs.

8. What is typically the earliest sign of heart failure?
Dyspnea on exertion

9. What are the three most common causes of right-sided congestive heart failure?
Left ventricle failure, pulmonary hypertension, and right ventricle myocardial infarction.

10. What is the forward effect of right-sided congestive heart failure?
The left ventricle receives inadequate volume to pump, resulting in a decreased cardiac output.

11. What is the backward effect of right-sided congestive heart failure?
The right ventricle is unable to pump, so blood backs up in the venous system.

12. What is the goal of treatment for congestive heart failure?
To decrease the heart’s workload and improve cardiac output.

13. Why are diuretics used for congestive heart failure?
To decrease cardiac workload by decreasing the fluid volume that the heart has to pump.

14. When does congestive heart failure occur?
It occurs when the heart cannot pump sufficiently to maintain blood flow to meet the body’s needs.

15. What are the common causes of heart failure?
Coronary artery disease, previous myocardial infarction, hypertension, atrial fibrillation, valvular heart disease, excessive alcohol use, and sepsis.

16. What are the diagnostic tests used for congestive heart failure?
BNP measures the severity of heart failure, chest x-ray, and EKG.

17. What is left-sided heart failure?
Left-sided heart failure occurs when the left ventricle fails, causing blood to back up into the lungs, resulting in respiratory symptoms and fatigue due to the insufficient supply of oxygenated blood.

18. What are the respiratory signs and symptoms of left-sided heart failure?
Increased work of breathing, tachypnea, rales/crackles heard in the lungs, dyspnea on exertion, and orthopnea.

19. What is right-sided heart failure?
Right-sided heart failure occurs when the right ventricle has difficulty pumping blood to the lungs. It is often caused by issues within the pulmonary circulation, such as pulmonary hypertension or pulmonary stenosis and backward failure of the right ventricle, leading to congestion of systemic capillaries.

20. What are the signs and symptoms of right-sided heart failure?
Peripheral edema, ascites, liver enlargement, and jugular vein distention.

21. What management is available for heart failure?
Diuretics, anti-hypertensives, smoking cessation, fluid restriction, and a low sodium diet.

22. How much of the thoracic cavity should the heart cover?

23. What is the primary sign or symptom of CHF?
Fluid overload

24. What early signs can be observed in patients with congestive heart failure?
Fatigue and reduced exercise tolerance

25. What can be expected in patients with congestive heart failure?
Shortened life expectancy

26. What is the principal manifestation of nearly every form of cardiac disease?
Heart failure

27. How many deaths occur each year due to congestive heart failure?
More than 200,000 deaths

28. How many hospitalizations occur each year due to congestive heart failure?
More than one million hospitalizations

29. What percentage of patients diagnosed with systolic congestive heart failure will still be alive within five years?
Approximately 50%

30. How is congestive heart failure characterized?
Intravascular and interstitial volume overload and manifestations of inadequate tissue perfusion.

31. What are the signs of intravascular and interstitial volume overload?
Shortness of breath, rales, and edema.

32. What are the symptoms of inadequate tissue perfusion?
Impaired exercise tolerance, fatigue, and renal dysfunction.

33. How many people have congestive heart failure in the United States?
Approximately 5 million

34. What age comprises 75% of the patients with congestive heart failure?
65 years old

35. What are five possible causes of left-sided heart failure?
Ischemia, hypertension, myocardial infarction, dilated cardiomyopathy, and restrictive cardiomyopathy.

36. How does ischemia cause left-sided heart failure?
Low blood flow causes damage to the heart’s myocardium, causing it to lose function as a pump.

37. How does hypertension cause left-sided heart failure?
Hypertension causes left ventricle hypertrophy, and a thicker wall is harder to oxygenate properly.

38. What is dilated cardiomyopathy (DCM)?
Dilated cardiomyopathy is a disorder of four-chambered dilatation where all chambers are stretched too wide.

39. How can DCM cause left-sided heart failure?
DCM causes the muscles of the chambers to stretch, which impedes the ability to contract, causing congestive heart failure.

40. How can myocardial infarction cause left-sided heart failure?
Dead cardiac myocytes cannot pump.

41. What is restrictive cardiomyopathy, and how can it cause left-sided heart failure?
Restrictive cardiomyopathy is a disorder in which the heart cannot fill properly; thus, the heart cannot pump sufficiently.

42. What is the primary consequence of left-sided heart failure?
Pulmonary congestion

43. What intravascular pressure increases during pulmonary congestion?
Hydrostatic pressure

44. What are the four symptoms of pulmonary congestion?
Pulmonary edema with dyspnea, paroxysmal nocturnal dyspnea (PND), orthopnea, and crackles.

45. What is orthopnea?
Difficulty breathing while lying flat (i.e., one of the primary signs of congestive heart failure).

46. What causes crackles?
Fluid in the lungs

47. What are three tests that can help with the diagnosis of CHF?
ABG, EKG, and CBC.

48. What is chronic heart failure?
Chronic heart failure is a long-term condition where the heart is unable to pump blood sufficiently, resulting in symptoms like breathlessness, fatigue, and fluid retention.

49. What is congenital heart disease?
Congenital heart disease refers to a range of structural heart defects present at birth that affect the normal flow of blood through the heart.

50. What is heart valve disease?
Heart valve disease is a condition in which one or more of the valves in the heart does not open or close properly, disrupting blood flow through the heart.

Final Thoughts

Congestive heart failure (CHF) is a debilitating condition that can significantly impact an individual’s quality of life.

Awareness of its causes, symptoms, and risk factors is crucial for early detection and intervention.

While there is no cure, effective management and lifestyle changes can help improve the prognosis and overall well-being of those living with CHF.

It’s a reminder of the importance of heart health and regular medical check-ups to catch and address this condition early.

Written by:

John Landry, BS, RRT

John Landry is a registered respiratory therapist from Memphis, TN, and has a bachelor's degree in kinesiology. He enjoys using evidence-based research to help others breathe easier and live a healthier life.


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  • Faarc, Kacmarek Robert PhD Rrt, et al. Egan’s Fundamentals of Respiratory Care. 12th ed., Mosby, 2020.
  • Malik A, Brito D, Vaqar S, et al. Congestive Heart Failure. [Updated 2022 Nov 7]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023.

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