A Answers (1)
Dr Lyall Gorenstein, MD, Thoracic Surgery (Cardiothoracic Vascular), answered on behalf of Columbia University Department of SurgeryA sudden blockage in the arteries of the lung, known as an acute pulmonary embolism (PE), begins as a clot in a vein elsewhere in the body that travels to the lung. A chronic blockage of the pulmonary arteries occurs when clots and other matter from the blood builds up in the vessels. It can be a part of a blockage remaining after the clearing of an acute pulmonary embolism, or a clot remaining from an undetected, and therefore untreated, acute pulmonary embolism.Helpful? 1 person found this helpful.