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Gram-negative septicemia, which continues to be a serious clinical problem, is one of the major causes of morbidity and mortality in hospitalized patients. Endotoxin of gram-negative bacteria is a pivotal pathogen of sepsis. To understand the effect of endotoxin on hematological aspect and the time course in early childhood, this study was designed with experimental septic model of young rabbits (8 week-old). Rabbits were divided into control (n=7) and endotoxin group (0.50 ㎎/㎏ of endotoxin). The endotoxin group was subdivided into six groups by the sampling times: 3, 6, 12, 24, 48 and 72 hr-group (E-G₃, E-G?, E-G₁₂, E-G₂₄, E-G₄? and E-G<SUB>72hrs</SUB>, each n=7). The evaluation of CBC, activated partial thromboplastin time (APTT), prothrombin time (PT), fibrinogen concentration, coagulation factors and D-dimer were taken from the bloods. The number of leukocytes was lower in E-G₃ and E-G<SUB>6hrs</SUB> (due to pantocytopenia), whereas it was higher in E-G₂₄ and E-G<SUB>48hrs</SUB> (due to neutrophilia and/or lymphophilia) than in control group (P<0.05). Platelet counts in E-G₃, E-G?, E-G₁₂, E-G₂₄ and E-G<SUB>48hrs</SUB> were lower than those of control group (P<0.05). Normoblast counts in E-G₃, E-G?, E-G₁₂ and E-G<SUB>48hrs</SUB> were higher than those of control group (P<0.01). APTT in E-G₃, E-G?, E-G₁₂, E-G₂₄ and E-G<SUB>72hrs</SUB> were longer while PT in E-G₃, E-G?, E-G₄? and E-G<SUB>72hrs</SUB> were higher than those of control group (P<0.05). Fibrinogen concentrations were lower in E-G₃, E-G? and E-G<SUB>l2hrs</SUB> but higher in E-G₄? and E-G<SUB>72hrs</SUB> than those of control (P<0.05). Intrinsic coagulation factors (?, ?, Ⅸ, Ⅷ) in all endotoxin groups were significantly lower than those of control group (P<0.05). Extrinsic coagulation factors (Ⅹ, Ⅶ, Ⅴ, Ⅱ) were lower in E-G₃, E-G?, E-G₁₂ and E-G<SUB>24hrs</SUB> whereas they were higher in E-G₄? and E-G<SUB>72hrs</SUB> than in control group (P<0.05). D-dimer concentrations in E-G₄? and E-G<SUB>72hrs</SUB> were higher than those of control group (P<0.001). We concluded that endotoxin led to extensive hematological disturbances including disseminated intravascular coagulation in the young rabbits and that this pathologic condition in the infant and childhood groups will cause the grave results.

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UCI(KEPA) : I410-ECN-0101-2009-510-017340634