Dizziness, light-headedness or a clot-in-transit: obtaining a history and physical exam is both a science and an art

Cognitive bias should be consistently challenged while ruling out pulmonary emboli based on the absence of typical signs.It is essential to differentiate vertigo from light-headedness or pre-syncope in patients presenting with a complaint of dizziness.Pre-syncope can be an important presenting complaint of haemodynamically significant pulmonary emboli and clots in transit.