Pulmonary Embolism: Symptoms and Emergency Treatment That Could Save Your Life

Pulmonary embolism (PE) occurs when a blood clot — most often originating in the deep veins of the leg (DVT) — detaches, travels through the venous system, and lodges in the pulmonary arteries supplying the lungs. PE is one of the three most common cardiovascular emergencies alongside heart attack and stroke, and it is the most preventable of the three. Understanding the warning signs and acting immediately can be the difference between life and death.

Who Is at Risk?

The risk factors for PE are the same as for DVT, since PE is almost always a complication of DVT. The highest-risk situations include:

• Recent major surgery — especially hip and knee replacement, abdominal, and pelvic surgery
• Prolonged immobility — bed rest, hospitalisation, long-haul travel
• Active cancer — cancer cells trigger procoagulant pathways
• Pregnancy and the 6 weeks postpartum
• Oral contraceptives or hormone replacement therapy combined with smoking
• Prior DVT or PE
• Inherited thrombophilia (factor V Leiden, prothrombin gene mutation, antiphospholipid syndrome)

Symptoms — The Warning Signs

PE symptoms range from mild to rapidly fatal. The classic triad of sudden breathlessness, chest pain, and coughing blood occurs in only a minority of patients. More commonly:

• Sudden unexplained breathlessness: The most common symptom — occurring at rest or with minimal exertion
• Pleuritic chest pain: Sharp pain that worsens with deep breathing or coughing
• Rapid heart rate (tachycardia): The heart races to compensate for reduced oxygenation
• Low oxygen saturation: Detected on pulse oximetry
• Coughing up blood (haemoptysis): Occurs in pulmonary infarction
• Feeling faint or collapsing: Massive PE can cause circulatory collapse and cardiac arrest
• Leg swelling: May accompany PE as evidence of the underlying DVT

Diagnosis

• CT Pulmonary Angiography (CTPA): The gold-standard test — directly visualises clots in the pulmonary arteries. Available 24 hours in major Cairo hospitals.
• D-Dimer blood test: A negative result effectively rules out PE in low-probability patients. A positive result requires imaging confirmation.
• Echocardiography: Assesses right heart strain — a marker of severity and haemodynamic compromise.
• Leg Doppler ultrasound: May identify the source DVT and supports the diagnosis.

Treatment

• Anticoagulation: Immediate heparin or LMWH followed by oral anticoagulation (DOAC preferred) for 3–6+ months. This prevents clot propagation and new embolism while the body dissolves the existing clot.
• Systemic thrombolysis: For massive PE with haemodynamic instability — clot-dissolving medication is given IV to rapidly restore pulmonary blood flow. Reserved for patients in extremis.
• Catheter-directed thrombolysis or embolectomy: For submassive PE not responding to anticoagulation alone.
• IVC filter: Placed in the inferior vena cava to trap future emboli in patients who cannot receive anticoagulation.