Start iv UFH adjusted for body weight.

UFH is recommended for patients in whom primary reperfusion is considered, as well as for those with serious renal impairment

severe obesity. 

LMWH or fondaparinux are preferred over UFH for initial anticoagulation in PE, as they carry a lower risk of inducing major bleeding

and heparin-induced thrombocytopenia.

This is a wrong response that could lead to potentially harmful results to the health.