While we're on the topic, let's throw a few more figures around carelessly:
- More than 95% of pulmonary thromboemboli originate from thrombi in the popliteal, femoral or ileal veins (although they have commonly propagated to there from the calf veins).
- DVTs arising below the popliteal veins that don't extend proximally are surprisingly not a risk factor for pulmonary emboli.
- Pulmonary embolism occurs in about half of patients with proximal (i.e. popliteal vein or above) DVTs.