The classic triad of Pulmonary Embolism (PE) — though present in only ~20% of cases — is:

1. Sudden dyspnea (most common presenting symptom)
2. Pleuritic chest pain (sharp, worsens on breathing)
3. Hemoptysis (blood-streaked sputum)

Other common signs of PE:

• Tachycardia
• Tachypnea (>20 breaths/min)
• Decreased SpO₂
• Anxiety and apprehension
• Signs of DVT (calf pain, swelling) in ~50% of cases

Nursing priority: High Fowler's position, oxygen therapy, IV access, notify physician immediately, prepare for anticoagulation therapy (heparin). PE is the most preventable cause of post-operative death.