tokens: After excluding case reports , the following groups were constructed :( a ) short - term administration , after valve insertion ( n = 212 );( b ) short - term , perioperative ( noncardiac )/ periprocedural ( n = 114 );( c ) long - term , due to intolerance to OAC ( n = 16 );( d ) long - term , in pregnancy ( n = 10 ). The incidence rate of thromboembolism was 0 .