With drug-eluting coronary stents implanted in more than 2 million people worldwide, some doctors
and researchers are now concerned about a long-term problem they see in a small number of patients
who have received stents: blood clots inside the stents themselves.
Although the rate of serious clotting is extremely low, with manufacturers reporting just a handful
of clots in more than 1,500 patients they are following, the cases concern doctors because clots
nearly always cause heart attacks or death.