Is pulmonary embolism an obstruction in the main artery to the lung?

Any artery. A pulmonary embolism (pe) is a clot in any of the arteries in the lungs. If the clot is large, it will lodge in one of the larger arteries, and can be fatal. If the clot is smaller, it will travel into the lung until the vessel is small enough to trap it, and may not even cause much in the way of symptoms. Any pe is serious, and the source of the clot needs to be found to prevent recurrences.
Yes. Pulmonary embolism is an obstruction, usually caused by a blood clot, in the arteries that go from the right side of the heart to the lungs. Does not have to be in the main artery necessarily.
Pulmonary embolism. Is a clot/thrombus with the main pulmonary artery on one of its branches.
No. A clot travelling through the pulmonary artery may lodge anywhere between the pulmonary artery and its distal branches depending on size of the clot, size of the vessel and friability of the clot. A large clot may lodge in the "main" pulmonary artery and produce sudden death, or it may breakup on its journey and produce a shower of multiple small clots in more distal vessels with minimal symptoms.

Related Questions

Any ideas why heart failures come from pulmonary embolism in the right upper lobe of the lung in arteriosclerosis?

Several ways. The pe can cause low oxygen including what goes to the heart. It can put strain on the heart, dilate the right side, cause hormones to be released cause tachycardia and due to that chf, arrhythmia and failure of the heart to push blood if big enough. It can then cause paradoxical pressures in the ventricles collapsing the left ventricle due to right pressure. Read more...

Will a CT angiogram of the coronary arteries reveal a pulmonary embolism or other lung disease and is it harmful to have 2 CT scans in the same month?

It might. A CT angiogram or the coronaries might show a pulmonary embolism, provided that the radiologists obtained full field of view reconstructions (some do not) and the pulmonary embolism is not higher or lower than the field of view. most often, the answer would be yes, a significant PE would be identified on this type of scan. having two ct's in the same month is not optimal, but likely of no harm. . Read more...

When pulmonary embolism happens in the lungs, what makes it so fatal?

Several things. A massive pulmonary embolus will essentially block most of the blood flow from the right ventricle to the lungs, preventing blood from getting oxygenated while putting a huge strain on the right ventricle. Since blood is then blocked from getting to the left side of the heart, systemic blood pressure severely drops along with oxygen delivery and things rapidly go down the tubes. Read more...
Heart stops. The problem with pulmonary emboli is that the blood clot obstructs the blood flow through the lungs. So the right side of the heart tries to pump blood through an obstructed pulmonary artery and it cannot. Thus the right heart of the heart stops and the patient's blood pressure drops and the patient collapses and dies. Pulmonary emboli are really dangerous. Read more...