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±ÇÁ¤ÅÃ/Jeong Taik Kwan ¹Ú½Â¿ø/±è¿µ¹é/¹Îº´±¹/Ȳ¼º¶÷/¼®Á¾½Ä/ÃÖ´ö¿µ/Seung Won Park/Young Baek Kim/Byung Kook Min/Sung Nam Hwang/Jong Sik Suk/Duck Young Choi

Abstract

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Hypoglycemia in human neonates often occurs together with hypoxia or hypotension.
Although many authors have investigated the biochemical derangements that occur
during these events, only a few studies have focused on the regulation and alteration of
neonatal cerebral bleed flow(CBF) in these settings where adenosine is probabley
involved in mediating the hypermic response of newbron brain to hypoglycemia. The
goal of this study was to determine whether interstitial fluid concentration of adnosine
affect the local CBF following local intersitial glucose infusion in severe hypoglycemic
piglets. Global cerebral ischemia was induced in piglets by occulsion of the subclavian
and brachiocephalic arteries for 10 minutes. Cortical CBF and interstitial adnosine
concentration were measured simultaneously, using combined hydrogen
clearance/microdialysis technique for 60 minutes after reperfusion. Severe
hypoglycemia(blood glucose<25§·/dl) was induced by regular insulin(25IU/§¸)
administered 2 hours prior to induction of ischemia. The piglets were allocated to one of
three groups : normoglycemia(Group NG). 8 ; hypoglycemia with local glucose
infusion(Group HGG), 5 ; hypoglycemia without glucose infusion(Group HG), 8.
The baseline CBF in Group HG was 39% greater than that in Group NG(p<0.05).
Local glucose infusion decreased the CBF to the level of Group NG. CBFs measured
after 50min, of postischemic reperfusion was reduced 30% in Group NG. 70% in Group
Hg, and 56% in Group HGG compared with each preischemic baseline level. Baseline
adenosine concentration markedly increased in all groups. The Group HG and HGG
showed significant postischemic reductions in the interstitial adenosine concentration
compared to the baseline levels. The postischemic reduction of adenosine concentration
was marked in Group HG compared to Group NG(p<0.05).
It is concluded that interstitial glucose infusion can restore local CBF and interstitial
adenosine level during preischemic period severe hypoglycemia state, but not difinity
during the period of postischemic hypoperfusion..

Å°¿öµå

Adenosine; Cerebral blood flow; Cerebral ischemia; Hypoglycemia; Microdialysis; Reperfusion injury.;

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