Pt with renal functions impaired, v/Q scan was done, showed some thing in rt lung, like positive finding for PE

Pt with renal functions impaired, v/Q scan was done, showed some thing in rt lung, like positive finding for PE
whats next.
a.Warfarin
b.Iv heprin
c.s/c enoxaparin
d.LMWH

2.Doppler showing plaque from tibial to popiliteal vein, patient RFts were very dearranged.
a.Warfarin
b.Iv heprin
c.s/c enoxaparin
d.LMWH