Pulmonary Embolism

Deoxygenated blood travels through the veins from the rest of the body into the heart, which pumps it through the pulmonary arteries into the lungs for reoxygenation. Blood coming to the heart from the veins may contain large particles, such as pieces of blood clots or tissue, fat globules, or air bubbles. A sufficiently large particle (embolus) can block an artery that leads to the lung's network of capillaries (where gas exchange occurs). Pulmonary embolism refers to the sudden blockage of one or more of the pulmonary arteries.

Conditions that cause clots in the veins, such as deep vein thrombosis (see page 236), frequently lead to pulmonary embolism. Although they are a rare cause of pulmonary embolism, fat globules can form after bone fractures and lodge within the capillary network (rather than in the pulmonary arteries themselves).

The onset of symptoms of pulmonary embolism is sudden. As the level of oxygen in the blood decreases, the brain increases the respiratory rate, leading to hyperventilation (abnormally deep or rapid breathing). Even if the clot breaks up, a pulmonary embolism can lead to pulmonary hypertension, a condition in which high blood pressure in the pulmonary artery puts strain on the right side of the heart, which may cause it to fail. Over time, the left side of the heart also begins to fail. Heart disease that results from any pulmonary disease is called cor pul-monale. If you already have heart or lung disease, a pulmonary embolism that a healthy person could easily tolerate may be life-threatening or fatal.

Diagnosing pulmonary embolism requires one of two imaging procedures: a pulmonary arteriogram or a high-resolution CT scan. In both procedures, contrast medium (dye) is injected into the veins, and X rays are taken to locate the blockage. However, because symptoms of pulmonary embolism also can indicate a heart attack, your doctor probably will perform a chest X-ray examination, electrocardiography (an examination of

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