2.15 Heart Problems

Heart problems include a range of cardiovascular diseases that affect the heart and blood vessels. This topic covers atherosclerosis, arteriosclerosis, and related conditions such as angina pectoris, heart attack, heart failure, and congenital heart problems.

Definition

Heart Problems: Heart problems refer to diseases and conditions that affect the heart and blood vessels. These include atherosclerosis, arteriosclerosis, angina pectoris, heart attack (myocardial infarction), heart failure, and congenital heart problems.

Atherosclerosis: Atherosclerosis is the plaque deposition of cholesterol in the arteries resulting in the narrowing of the arteries lumen.

Arteriosclerosis: Arteriosclerosis is the hardening of arteries due to the deposition of fibres in cholesterol, which often calcify and become hard.

Main Idea

• Atherosclerosis — cholesterol plaque builds up in arteries
• Arteriosclerosis — arteries harden due to calcification
• Angina pectoris — chest pain due to reduced blood flow
• Heart attack — complete blockage of coronary artery
• Heart failure — inability of the heart to pump enough blood
• Congenital heart problems — abnormalities present at birth

Core Concept

• Atherosclerosis = plaque deposition of cholesterol
• Arteriosclerosis = hardening of arteries
• Angina pectoris = chest pain
• Heart attack = myocardial infarction
• Heart failure = inability to pump
• Congenital = present at birth
• Valvular stenosis = congenital heart problem
• Risk factors = hypercholesterolemia, hypertension, smoking, diabetes

Detailed Explanation

Atherosclerosis and Arteriosclerosis

• The plaque deposition of cholesterol in the arteries.
• Results in the narrowing of the arteries lumen.
• Later, fibres are deposited in the cholesterol.
• These often start to calcify and become hard.

• The process of hardening of arteries.
• The plaque first forms thrombus and may detach to form embolus.

Major Factors Causing Atherosclerosis and Arteriosclerosis:

Stages of Cardiovascular Disease Development

• Due to atherosclerosis, a person may feel occasional chest pain.
• Angina is most likely to occur when the heart is labouring hard because of physical or emotional stress.
• Angina is a signal that part of the heart is not receiving a sufficient supply of oxygen.
• It indicates that a heart attack could occur in the future.

• Many heart attacks occur without warning.
• A blood clot may completely block a coronary artery.
• Atherosclerosis may reach a critical level causing massive damage to the heart muscle.
• Symptoms:
• Heavy squeezing ache or discomfort in the centre of the chest.
• Pain may radiate to shoulder, arm, neck, or jaw.
• Sweating, nausea, shortness of breath, dizziness, or fainting.
• The whole process is called myocardial infarction (heart muscle death due to lack of oxygen).
• When heart muscles die, they are not replaced because cardiac muscles do not divide.
• Scar tissue grows into the areas where the heart muscles have died.
• Scar tissue cannot contract as cardiac muscle.
• The damaged heart is permanently weakened.

• Congestive heart failure is the inability of the heart to pump all the blood coming to it.
• The cardiac output is unable to keep pace with the venous return.

• Congenital heart problems result from abnormalities in the embryonic development.
• It can be related to the malfunctioning of cardiac valves e.g., valvular stenosis.

Intermediate Level

Comparison of Atherosclerosis and Arteriosclerosis

Stages of Cardiovascular Disease

Risk Factors for Heart Problems

Major Factors Causing Atherosclerosis

Formula / Mathematical Form

Not applicable to this topic.

Solved Example

Not applicable to this topic (descriptive topic).

Important Points

• 1. Atherosclerosis = plaque deposition of cholesterol.
• 2. Arteriosclerosis = hardening of arteries.
• 3. Major factors: hypercholesterolemia, hypertension, smoking, diabetes.
• 4. Angina = chest pain due to reduced blood flow.
• 5. Heart attack = myocardial infarction.
• 6. Heart failure = inability to pump enough blood.
• 7. Congenital = present at birth.
• 8. Valvular stenosis = congenital heart problem.
• 9. Cardiac muscle does not divide.
• 10. Scar tissue cannot contract.
• 11. Heart is permanently weakened after heart attack.
• 12. Cardiac output cannot keep pace with venous return in heart failure.
• 13. Atherosclerosis can lead to thrombus and embolus.
• 14. Risk factors include age, genetics, obesity, stress.
• 15. Prevention includes lifestyle changes.

Remember

• - Atherosclerosis = plaque deposition
• - Arteriosclerosis = hardening of arteries
• - Angina = chest pain
• - Heart attack = myocardial infarction
• - Heart failure = pump failure
• - Congenital = present at birth
• - Valvular stenosis = congenital heart problem
• - Major factors = hypercholesterolemia, hypertension, smoking, diabetes
• - Cardiac muscle = does not divide
• - Scar tissue = cannot contract
• - Risk factors = age, genetics, obesity, stress

Common Mistakes

• 1. Confusing atherosclerosis and arteriosclerosis — Atherosclerosis = plaque; arteriosclerosis = hardening.
• 2. Thinking angina is a heart attack — Angina is chest pain; heart attack is muscle death.
• 3. Forgetting the risk factors — Hypercholesterolemia, hypertension, smoking, diabetes.
• 4. Mixing up the stages — Angina → heart attack → heart failure.
• 5. Thinking heart muscle regenerates — Cardiac muscle does not divide.
• 6. Believing congenital means acquired — Congenital means present at birth.
• 7. Confusing heart failure with heart attack — Heart failure = pump failure; heart attack = muscle death.
• 8. Forgetting the role of scar tissue — Scar tissue cannot contract.
• 9. Mixing up the major and minor risk factors — Major: hypercholesterolemia, hypertension, smoking, diabetes.
• 10. Thinking heart problems only affect older people — They can affect younger people too.

Quick Revision

Heart problems include atherosclerosis, arteriosclerosis, angina pectoris, heart attack, heart failure, and congenital heart problems. Atherosclerosis is the plaque deposition of cholesterol in arteries, causing narrowing. Arteriosclerosis is the hardening of arteries due to calcification. Major factors include hypercholesterolemia, hypertension, smoking, and diabetes. Angina pectoris is chest pain due to reduced blood flow. Heart attack (myocardial infarction) is the death of heart muscle due to lack of oxygen. Heart failure is the inability of the heart to pump all the blood coming to it. Congenital heart problems result from abnormalities in embryonic development, such as valvular stenosis. Cardiac muscle does not divide, so scar tissue forms after a heart attack, permanently weakening the heart.

60-Second Revision

• Atherosclerosis = plaque deposition
• Arteriosclerosis = hardening of arteries
• Angina = chest pain
• Heart attack = myocardial infarction
• Heart failure = pump failure
• Congenital = present at birth
• Valvular stenosis = congenital heart problem
• Major factors = hypercholesterolemia, hypertension, smoking, diabetes
• Cardiac muscle = does not divide
• Scar tissue = cannot contract
• Warning: Atherosclerosis can lead to thrombus and embolus

NEXT TOPIC

• Chapter:
• 2. Blood Circulatory System of Man

• Topic:
• 2.16 STAGES OF CARDIOVASCULAR DISEASE DEVELOPMENT

Source: