The American Heart Association and the American College of Cardiology have released their first clinical practice guideline on acute pulmonary embolism, a sudden and potentially life-threatening blood clot that blocks arteries in the lungs. Published in Circulation and JACC, the guideline introduces a new Acute Pulmonary Embolism Clinical Category system to classify patients based on severity and risk, aiding in treatment decisions across care settings.
Acute PE is a medical emergency that can lower oxygen levels, damage lung tissue, and strain the heart. According to the American Heart Association’s 2026 Heart Disease and Stroke Statistics, approximately 470,000 people are hospitalized with PE annually in the U.S., and about 1 in 5 high-risk patients die. The guideline emphasizes early detection and prompt treatment to prevent severe complications.
The new classification system categorizes patients into five groups (A-E). Categories A and B include patients with no or mild symptoms and low risk, who can often be managed as outpatients. Categories C-E include higher-risk patients requiring hospitalization or critical care. The guideline also details risk factors such as recent surgery, trauma, prolonged immobility, pregnancy, obesity, cancer, and clotting disorders.
For diagnosis, the guideline recommends D-dimer testing for patients with low or intermediate probability of PE, followed by computed tomography pulmonary angiography (CTPA) if D-dimer is elevated or clinical probability is high. Alternative imaging like ventilation/perfusion scans is advised for those unable to undergo CTPA.
Treatment primarily involves anticoagulants, with direct oral anticoagulants (DOACs) preferred over warfarin due to safety and efficacy. For high-risk patients in categories D-E, advanced interventions such as catheter-based clot removal or surgical embolectomy may be necessary. The guideline also addresses special populations, including pregnant women, who should use low-molecular-weight heparin instead of DOACs.
Follow-up care includes early communication within one week of discharge, a three-month visit to assess ongoing anticoagulation, and long-term monitoring for chronic thromboembolic pulmonary disease. The guideline also recommends screening for psychological health issues like depression and anxiety, encouraging physical activity, and providing travel precautions to reduce clot risk.
“This guideline is a road map to help clinicians navigate these advances for the safest and most effective approaches to care,” said Mark A. Creager, chair of the writing committee. The guideline was developed with collaboration from multiple professional societies and is endorsed by organizations including the American College of Emergency Physicians and the Society for Vascular Medicine.
For more information, visit the American Heart Association’s guideline hub at https://professional.heart.org/guidelines and the ACC’s guideline hub at https://www.acc.org/guidelines.
