Cardiac Anatomy, Ischemia, and Angina Types: A Detailed Overview

What is the function of the right atrium?

Receives deoxygenated blood from the body.

What does the right ventricle do?

Pumps deoxygenated blood to the lungs.

What is the role of the left atrium?

Receives oxygenated blood from the lungs.

What is the function of the left ventricle?

Pumps oxygenated blood to the body.

What occurs during systole?

The heart contracts and pumps blood out.

What happens during diastole?

The heart relaxes and fills with blood.

What is the purpose of the tricuspid valve?

Prevents the backflow of blood into the right atrium.

What is the pathway of deoxygenated blood from the body to the lungs?

Deoxygenated blood enters the right atrium via the superior and inferior vena cava, moves to the right ventricle, and is pumped through the pulmonary valve into the pulmonary artery.

What is the aorta's function?

Carries oxygenated blood to all parts of the body.

What is a myocardial infarction (MI)?

A localized area of necrotic tissue in the heart caused by occlusion of a coronary artery.

What is ischemia?

Reduced blood flow to the heart, preventing the heart muscle from receiving enough oxygen.

What is the treatment goal for ischemia?

To prevent the progression of ischemia to infarcted tissue.

What causes exertional angina?

Atherosclerotic plaque causes fixed narrowing of the artery, limiting blood flow during exercise.

What is unstable angina?

A medical emergency where a thrombus forms in a narrowed artery, greatly reducing blood flow.

What distinguishes Prinzmetal angina?

It is caused by smooth muscle spasms that suddenly narrow the artery, potentially occurring at rest.

What are the symptoms of unstable angina?

Angina at rest, new-onset exertional angina, and intensification of existing angina.

What is the role of beta blockers in treating ischemia?

They decrease heart rate and contractility, reducing heart workload and oxygen demand.

What is the purpose of antiplatelet therapy?

To prevent blood clot formation in patients with coronary artery disease.

What should be administered if oxygen saturation is less than 90%?

Oxygen should be given if the patient shows signs of respiratory distress.

What is the significance of the left anterior descending artery?

Occlusion can lead to anterior wall damage, known as the 'widow maker' due to its high mortality rate.

What happens to heart tissue after 20 minutes of artery blockage?

Tissue begins to infarct (die) after 20 minutes without blood flow.

What can salvage heart tissue after an artery blockage?

Restoring blood flow within 4 hours of the blockage can salvage tissue.

What is the function of the pulmonary veins?

They carry oxygenated blood from the lungs to the left atrium.

What is the mitral valve's role?

It allows oxygenated blood to enter the left ventricle from the left atrium.