1 9 8 3 . ▁Vol . ▁II , ▁pp . ▁ 7 4 3 - 7 8 8 . ▁ ▁Category : Form er ▁National ▁For ests ▁of ▁Oregon ▁Category : 1 9 0 6 ▁establish ments ▁in ▁Oregon ▁Category : Pro te cted ▁areas ▁established ▁in ▁ 1 9 0 6 ▁Category : 1 9 0 8 ▁dis est ab lish ments ▁in ▁Oregon <0x0A> </s> ▁In ▁medicine , ▁v asc ular ▁access ▁is ▁a ▁means ▁of ▁accessing ▁the ▁blood stream ▁through ▁the ▁peri pher al ▁or ▁central ▁blood ▁vessels ▁in ▁order ▁to ▁obtain ▁blood ▁or ▁deliver ▁medic ations ▁including ▁chem other apy . ▁A ▁v asc ular ▁access ▁procedure ▁involves ▁insert ion ▁of ▁a ▁ster ile ▁pl astic ▁t ube ▁called ▁a ▁c ath eter ▁into ▁a ▁blood ▁vessel . ▁Types ▁of ▁c ath eters ▁can ▁be ▁either ▁peri pher ally ▁or ▁cent r ally ▁located . ▁Per i pher al ▁c ath eters ▁are ▁approximately ▁one ▁in ch ▁long ▁and ▁are ▁inserted ▁into ▁the ▁small ▁ve ins ▁of ▁the ▁for ear m . ▁Central ▁c ath eters ▁are ▁bigger ▁and ▁longer ▁and ▁are ▁inserted ▁into ▁the ▁large ▁ve ins ▁of ▁the ▁extrem ities , ▁neck , ▁or ▁ch est . ▁Central ▁ven ous ▁c ath eters ▁is ▁the ▁primary ▁mod ality ▁used ▁for ▁delivery ▁of ▁chem other ape ut ic ▁agents . ▁The ▁duration ▁of ▁central ▁ven ous ▁c ath eter ization ▁is ▁dependent ▁on ▁the ▁type ▁of ▁treatment ▁given . ▁ ▁Central ▁ven ous ▁c ath eters ▁▁