▁display ▁any ▁sympt oms ▁while ▁other ▁patients ▁may ▁experience ▁blo ody ▁ur ine , ▁decrease ▁in ▁ur ine ▁output , ▁ed ema ▁and ▁w ors ening ▁protein uria . ▁Usually ▁the ▁diagn oses ▁of ▁R V T ▁is ▁first ▁made ▁when ▁a ▁ne ph rot ic ▁synd rome ▁patient ▁experiences ▁a ▁pul mon ary ▁em bol ism ▁or ▁a ▁sudden ▁decrease ▁in ▁kid ney ▁function ▁or ▁kid ney ▁failure . ▁These ▁sympt oms ▁may ▁vary ▁in ▁duration ▁since ▁a ▁blood ▁cl ot ▁can ▁resolve ▁itself , ▁but ▁pre ca utions ▁should ▁be ▁taken ▁to ▁prevent ▁the ▁migration ▁of ▁the ▁cl ot ▁to ▁other ▁parts ▁of ▁the ▁body . ▁The ▁most ▁severe ▁comp lication ▁of ▁R V T ▁is ▁a ▁pul mon ary ▁em bol ism , ▁caused ▁by ▁a ▁cl ot , ▁also ▁called ▁a ▁th rom bus , ▁that ▁origin ates ▁from ▁the ▁ren al ▁ve in ▁or ▁any ▁other ▁ve in ▁in ▁the ▁body ▁and ▁migr ates ▁to ▁the ▁pul mon ary ▁ar tery . ▁A ▁pul mon ary ▁em bol ism ▁is ▁a ▁serious ▁condition ▁because ; ▁it ▁can ▁damage ▁the ▁l ungs ▁due ▁to ▁pul mon ary ▁hy pert ension ▁and ▁cause ▁low ▁blood ▁o xygen , ▁dam aging ▁other ▁org ans ▁in ▁the ▁body . ▁This ▁condition ▁can ▁cause ▁death ▁if ▁left ▁un tre ated ; ▁about ▁ 3 0 % ▁percent ▁of ▁patients ▁who ▁have ▁a ▁pul mon ary ▁em bol ism ▁will ▁die , ▁usually ▁within ▁one ▁hour . ▁ ▁Inf ants ▁and ▁young ▁children ▁experien