title: Experimental studies to estimate the intestinal viability in a rat strangulated ileus model using a dielectric parameter.
abstract: This study aimed at establishment of adequate evaluation of intestinal viability before release of the strangulated intestine by measuring electrical properties. In rats a 20-cm segment of the distal ileum and mesentery was strangulated. The intestine was strangulated for 0, 2, 15, 45, 90, and 120 min. The conductance and capacitance obtained by impedance analyzer were used to calculate tan(delta)m in the strangulated intestine. ATP was measured as well. In another experiment, after various periods of strangulation, tan(delta)m was measured just before release of the strangulation. Rats were divided into Group A (survived for 7 days) and Group D (died within 7 days). There was a positive correlation between tan(delta)m and ATP levels (P < 0.01). And tan(delta)m was significantly greater in Group A than in Group D (P < 0.05). There were no deaths at a tan(delta)m value of 2.36 or more and no survivors at a tan(delta)m of less than 2.20 except for one rat. These results suggested that tan(delta)m may be a useful index of the viability of the strangulated intestine before reperfusion.
authors.affiliation: First Department of Surgery, Gifu University School of Medicine, 40 Tsukasa, Gifu City, Gifu 500-8705, Japan. h-matsuo@cc.gifu-u.ac.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Matsuo
authors.forename: Hajime
authors.initials: H
authors.lastname: Hirose
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Mori
authors.forename: Hisato
authors.initials: H
authors.lastname: Takagi
authors.forename: Hisashi
authors.initials: H
authors.lastname: Iwata
authors.forename: Takuya
authors.initials: T
authors.lastname: Yamada
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Sakamoto
authors.forename: Mikio
authors.initials: M
authors.lastname: Yasumura
mesh_terms: D000255:Adenosine Triphosphate / Q000032:analysis / Q000378:metabolism*; D000818:Animals; D004195:Disease Models, Animal; D017097:Electric Impedance; D004568:Electrodiagnosis / Q000379:methods; D007077:Ileal Diseases / Q000473:pathology* / Q000628:therapy; D045823:Ileus / Q000473:pathology* / Q000628:therapy; D007511:Ischemia / Q000473:pathology* / Q000628:therapy; D008297:Male; D011336:Probability; D051381:Rats; D017208:Rats, Wistar; D012016:Reference Values; D015424:Reperfusion / Q000379:methods*; D012680:Sensitivity and Specificity
chemical_list: D000255:Adenosine Triphosphate