What Coronary heart disease – Coronary heart disease (CHD) is a disease in which a waxy substance called plaque (plaque) in the coronary arteries. These arteries supply oxygen-rich blood to your heart muscle.
When plaque builds up in the arteries, a condition called atherosclerosis (ATH-er-o-skler-O-sis). Plaque buildup occurred over the years.
Figure A shows the location of the heart in the body. Figure B shows normal coronary arteries with normal blood flow. Inset image shows a cross section of a normal coronary arteries. Figure C shows the coronary arteries narrowed by plaque. Plaque buildup restricts the flow of oxygen-rich blood through the arteries. Inset image shows a cross section of the plaque-narrowed arteries.
Over time, plaque can harden or rupture (open). Hardened plaque narrows the coronary arteries and reduce the flow of oxygen-rich blood to the heart.
If the plaque rupture, a blood clot can form on its surface. A large blood clot may partially or completely block blood flow through the coronary arteries. Over time, plaque rupture also hardened and narrowed coronary arteries.
If the flow of oxygen-rich blood to your heart muscle is reduced or blocked, angina (an-JI-nuh or AN-Juh-nuh) or heart attack can occur.
Angina is chest pain or discomfort. It may feel like pressure or squeezing in your chest. The pain may also occur in your shoulders, arms, neck, jaw, or back. Angina pain may even feel like indigestion.
A heart attack occurs when the flow of oxygen-rich blood to the heart muscle is cut off. If blood flow is not restored quickly, the part of the heart muscle begins to die. Without quick treatment, a heart attack can cause serious health problems or death.