Warfarin Resistance and Enteral Feedings

Nutritional support via enteral feeding tubes may interfere with the response to medications by a number of mechanisms. A 31-year-old, white man was admitted after sustaining a gunshot wound to the chest and mandible. Subsequently, the patient developed pulmonary emboli documented by angiography. Attempts at anticoagulation with oral warfarin were unsuccessful while the patient was receiving 50-100 ml/ hr of Osmolite through an Entriflex feeding tube and intermittent oral Ensure Plus supplements. Discontinuation of the Osmolite resulted in a prompt prolongation of the prothrombin time. The Ensure Plus was continued and adequate prothrombin times were achieved on 7.5 to 10 mg of warfarin daily. The total amount of vitamin K received from the enteral feedings ranged from 50 to 115 μg/day, which is less than the normal daily intake of 300 to 500 μg. Previous reports of warfarin resistance implicated older enteral feeding products with a much higher vitamin K content. Difficulty with anticoagulation may still be experienced with the newer formulations. It is unknown whether the vitamin K content or malabsorption of warfarin is the mechanism of resistance. (Journal of Parenteral and Enteral Nutrition 13:206-208, 1989)