Pulmonary Embolism Fast Facts: Wells Score Menmonic

Clots can form due to many reasons that we all are aware about. Let's do a quick review of certain facts for this deadly diagnosis.

• Pulmonary Emboli arise from Proximal DVT (Above the Knee)
• Distal DVTs in itself does not a risk for PE unless they migrate upwards.
• Pregnancy PEs are from Pelvic Veins (Risks last upto 2 months post delivery)
• PE = Alveolar Dead Space Ventilation
• ~ 50% Lung involved will lead to Pulmonary HTN
• Massive PE =  >70% Lung Involvement (10% will die in first 1 Hour)
• Recent Surgery in last 4 weeks poses a risk (mostly it is Orthopedic Surgery: 70% Risks in Knee Surgery)
• Unexplained DVT: 15 - 20 % of these will develop malignancy in next 2 years