Retropharyngeal hematoma--a rare complication of anticoagulant therapy.

Anticoagulation is routinely employed in cardiac surgery following mechanical valve replacement. Warfarin is the most common agent used for anticoagulation. Bleeding, internal or external, remains the major complication with anticoagulant therapy. The risk is known to be higher with INR levels above 4.5. We report a case of a retropharyngeal hematoma following trivial blunt trauma to a patient whose INR had shot up to 6.8 and also discuss its management.