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Acute pulmonary embolism

About
Risks
Symptoms
Diagnosis
Prevention

Acute pulmonary embolism (PE) is a life-threatening condition that occurs when a blood clot blocks a pulmonary artery in the lungs, disrupting blood flow to the lung tissue. This obstruction can lead to significant respiratory compromise, cardiovascular instability, and can result in death if not promptly diagnosed and treated. The majority of pulmonary embolisms originate from deep vein thrombosis (DVT) in the legs or other parts of the body.

Key risk factors for developing acute pulmonary embolism include prolonged immobility, recent surgery (especially orthopedic procedures), cancer, obesity, and a history of venous thromboembolism. Other contributing factors may include hormonal therapy, pregnancy, and genetic predispositions to clotting disorders. Comprehensive risk assessment is essential for prevention, particularly in hospitalized patients.

Symptoms of acute pulmonary embolism can vary widely but often include sudden onset of shortness of breath, chest pain (which may be pleuritic in nature), rapid heart rate, and cough (which may produce blood-streaked sputum). Additional manifestations may include dizziness, fainting, sweating, and feelings of anxiety. The clinical presentation may mimic other conditions, necessitating careful evaluation.

Acute pulmonary embolism (PE) is primarily caused by deep vein thrombosis (DVT), where blood clots form in the deep veins of the legs and travel to the lungs. Other potential causes include air emboli, fat emboli from long bone fractures, and amniotic fluid embolism during childbirth. Risk factors include prolonged immobilization, recent surgery, cancer, obesity, and certain genetic predispositions that increase clotting tendencies.

Diagnosis of acute pulmonary embolism typically involves a combination of clinical assessment, imaging studies, and laboratory tests. The Wells score and D-dimer levels may guide further imaging, with computed tomography pulmonary angiography (CTPA) being the gold standard for visualization of clots within the pulmonary arteries. If CTPA is inconclusive, additional tests such as a ventilation-perfusion (V/Q) scan or ultrasound of the extremities can be employed.

The treatment for acute pulmonary embolism generally involves anticoagulation therapy to prevent further clotting and allow the body's natural mechanisms to dissolve the existing clots. In severe cases, thrombolytic therapy may be employed to rapidly dissolve clots, while surgical options like embolectomy may be considered for life-threatening embolisms. Supportive care, including oxygen therapy and, in some cases, the administration of fluids, is critical to stabilize the patient.

Preventive strategies for acute pulmonary embolism focus on mitigating known risk factors, particularly in individuals at increased risk. Measures include maintaining physical activity, using compression stockings during prolonged immobility, and employing pharmacological prophylaxis with anticoagulants in high-risk populations, especially during hospitalization or post-surgery. Educating patients about the signs and symptoms of DVT and PE is crucial for early identification and intervention.
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