In the trailer for the movie Jaws 2 they show a swimmer in the ocean with a deep voice saying, “Just when you thought it was safe to go back into the water…” followed by the classic music associated with a shark attack and a big fin approaching the unsuspecting swimmer. I feel much the same way upon reading a Medpage Today online journal review of an article in JAMA Neurology published on December 14, 2015. Jan C. Purrucker, MD and colleagues looked at 61 consecutive patients with non-trauma related cerebral hemorrhages due to the newer oral anticoagulants Pradaxa, Xarelto and Eliquis. Overall there was a death rate of 28% at three months and “two out of 3 survivors had an unfavorable outcome.”
In October of 2015 the FDA approved the use of the antibody fragment idarucizumab (Praxbind) to reverse anticoagulation in patients bleeding from the administration of the oral anticoagulant Pradaxa. There are currently no medications to reverse the bleeding from the drugs Xarelto or Eliquis but we are promised that new products are in development. The article goes on to discuss how physicians have been forced to improvise when patients on these medications show up bleeding. They have tried fresh frozen plasma, 3-factor, 4-factor and activated prothrombin complex concentrates prothrombin complex concentrates, recombinant factor VIIa and cryoprecipitate alone or in combination with marginal success at best.
Despite there being no antidote to these blood thinners, the massive direct to consumer advertising continues on television prime time and magazines as if the products are no more dangerous than an antacid for heartburn. Coumadin or warfarin is the prototype anticoagulant working by inhibiting vitamin K dependent clotting factors. Its effects are reversible with administration of Vitamin K and clotting factors if bleeding occurs. Coumadin requires periodic blood tests (INR) to check on its efficacy and there is a long list of medications and foods that need to be avoided or adjusted while taking it. It is less convenient but safer in the sense that its effects can be reversed with medication.
The newer oral anticoagulants were championed by several studies that suggested that they were more effective in preventing embolic strokes in patients with the heart rhythm atrial fibrillation. Many experts in the field felt that those conclusions were flawed because the Coumadin group was not tightly regulated to keep their INR in a therapeutic non-clotting range thus unfairly biasing the results in favor of the newer agents.
There is no question that the newer agents are more convenient than warfarin treatment, but until there are readily available antidotes, complications seem to be more difficult to limit and control.
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