... partly the cause) of the pulmonary hypertension. IIaC In patients who are already taking drug therapy for PAH before becoming pregnant, continuation should be considered after information about ... because of the need for increasing dosages of LMWH during preg-nancy.2,4,7,147,151,153As an alternative, continuation of OACs maybe considered in these patients after fully informed consent. The ... withreplacement of OACs during the pregnancy by either UFH orLMWH. A risk assessment concerning the type of anticoagulationchosen should be performed. Because of the increased risk of bleeding in these...