Every year, about 900,000 Americans develop a pulmonary embolism (PE), or a blood clot in the lungs. Learn more about this acute life-threatening problem, including the seven warning signs that should prompt you to seek emergency care. 2026 Acute PE Guideline Overview The provides comprehensive recommendations for the evaluation, management, and follow-up of adult patients with acute pulmonary embolism. A pulmonary embolism (PE) is a blood clot that blocks the flow of blood to part of one lung. Many people with this condition have two or more clots in one or both lungs. This guideline encompasses the period from the onset of symptoms through clinical follow-up, focusing on risk outcomes assessment, clinical diagnosis of acute PE, appropriate use of adjunctive cardiovascular testing, and management in both the acute and early post-acute phases of PE. A pulmonary embolism (PE) occurs when a blood clot gets stuck in an artery in the lung, blocking blood flow to part of the lung. Blood clots most often start in the legs and travel up through the right side of the heart and into the lungs. Pulmonary embolism. Pulmonary embolism (PE) is a blockage of an artery in the lungs by a substance that has moved from elsewhere in the body through the bloodstream (embolism). [6] Symptoms of a PE may include shortness of breath, chest pain particularly upon breathing in, and coughing up blood. [1] Read more about a pulmonary embolism, which is when a blood clot blocks a blood vessel in your lungs. It can be life-threatening if not treated quickly. The price-to-earnings (P/E) ratio, also known as the price or earnings multiple, measures a company's current share price relative to its per-share earnings. A pulmonary embolism (PE) is a blood clot that travels to your lungs from somewhere else in your body and blocks blood flow. Usually, the clot starts in a vein in your leg or pelvis. Evidence‑based guideline outlining PE risk categories, hospitalization criteria, and recommendations favoring DOACs to improve outcomes and reduce bleeding.