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  2. Heart failure - Wikipedia

    en.wikipedia.org/wiki/Heart_failure

    The left side of the heart takes oxygen-rich blood from the lungs and pumps it to the rest of the circulatory system in the body (except for the pulmonary circulation). Failure of the left side of the heart causes blood to back up into the lungs, causing breathing difficulties and fatigue due to an insufficient supply of oxygenated blood.

  3. Coronary arteries - Wikipedia

    en.wikipedia.org/wiki/Coronary_arteries

    It is caused by more severe narrowing of the arteries. [9] Heart attack. A heart attack results from a sudden plaque rupture and formation of a thrombus (blood clot) that completely blocks blood flow to a portion of the heart, leading to tissue death . CAD can also result in heart failure or arrhythmias. Heart failure is caused by chronic ...

  4. Coronary circulation - Wikipedia

    en.wikipedia.org/wiki/Coronary_circulation

    Failure of oxygen delivery caused by a decrease in blood flow in front of increased oxygen demand of the heart results in tissue ischemia, a condition of oxygen deficiency. Brief ischemia is associated with intense chest pain, known as angina. Severe ischemia can cause the heart muscle to die from hypoxia, such as during a myocardial infarction ...

  5. Coronary occlusion - Wikipedia

    en.wikipedia.org/wiki/Coronary_occlusion

    Coronary occlusion is caused by plaque inside of the blood vessels that direct oxygen rich blood to the heart. [8] Plaque is caused by fatty deposits and scar tissue that cling to the walls of coronary arteries. [9] The development of plaque takes years and leads to stenosis of the coronary arteries and progressively reduces blood flow. [8]

  6. Coronary ischemia - Wikipedia

    en.wikipedia.org/wiki/Coronary_ischemia

    Plaques in the walls of the coronary arteries can rupture, resulting in occlusion of the artery and deprivation of blood flow and oxygen to the heart muscle, resulting in cardiac cell death. [9] This is known as myocardial infarction. [9] A heart attack can cause arrhythmias, as well as permanent damage to the heart muscle. [25]

  7. Cardiac physiology - Wikipedia

    en.wikipedia.org/wiki/Cardiac_physiology

    The systemic circuit transports oxygen to the body and returns relatively de-oxygenated blood and carbon dioxide to the pulmonary circuit. [1] Blood flows through the heart in one direction, from the atria to the ventricles, and out through the pulmonary artery into the pulmonary circulation, and the aorta into the

  8. Coronary artery disease - Wikipedia

    en.wikipedia.org/wiki/Coronary_artery_disease

    Illustration depicting coronary artery disease. Limitation of blood flow to the heart causes ischemia (cell starvation secondary to a lack of oxygen) of the heart's muscle cells. The heart's muscle cells may die from lack of oxygen and this is called a myocardial infarction (commonly referred to as a heart attack). It leads to damage, death ...

  9. Oxygen saturation (medicine) - Wikipedia

    en.wikipedia.org/wiki/Oxygen_saturation_(medicine)

    The human body requires and regulates a very precise and specific balance of oxygen in the blood. Normal arterial blood oxygen saturation levels in humans are 96–100 percent. [1] If the level is below 90 percent, it is considered low and called hypoxemia. [2] Arterial blood oxygen levels below 80 percent may compromise organ function, such as ...

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