Abstract
Introduction
Neuronal reflex inhibition of gastrointestinal motility is a key mechanism in the development of postoperative ileus (POI). The aim of our study was to determine whether intestinal afferent nerve fibers are sensitized during the first hours after surgery contributing to this mechanism.
Methods
Under enflurane anesthesia, C57BL/6 mice underwent laparotomy followed by sham treatment or standardized small bowel manipulation to induce POI. After 1, 3, or 9 h, extracellular multi-unit mesenteric afferent nerve recordings were performed in vitro from 2 cm segments of jejunum (subgroups n = 6) superfused with Kreb’s buffer (32°C, gassed with O2/CO2 mixture). Segments were cannulated to monitor luminal pressure and intestinal motility. Afferent impulses as response to bradykinin (0.5 μM) and to mechanical ramp distension of the intestinal lumen from 0 to 80 cmH2O were recorded.
Results
At 1 h, amplitudes of intestinal contractions were 0.8 ± 0.2 cmH2O after induction of POI and 5.0 ± 0.8 cmH2O in sham controls (mean ± SEM; p < 0.01). A similar difference was observed for segments harvested at 3 and 9 h. Afferent firing to serosal bradykinin was increased at 1, 3, and 9 h in POI segments compared to sham controls (p < 0.05 at 1 h, p < 0.01 at 3 and 9 h). During distension with high pressures, afferent firing rate was increased at 1 and 3 h in segments after induction of POI compared to sham controls. Nine hours postoperatively, contracted and dilated segments were observed during POI that were investigated separately. While afferent firing in dilated segments was increased to 176 ± 16 imp s−1 at 80 cmH2O luminal distension (p < 0.01), it was 46 ± 5 imp s−1 in contracted segments (p < 0.001) compared to 77 ± 4 imp s−1 in sham controls.
Conclusions
Afferent firing to bradykinin and high threshold distension is augmented in the early phase of POI. As these stimuli are known to sensitize predominantly spinal afferents, this mechanism may contribute to reflex inhibition of intestinal motility during POI.
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Acknowledgments
This work was supported by the Deutsche Forschungsgemeinschaft (DFG; KR 1816/8-1).
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Mueller, M.H., Karpitschka, M., Xue, B. et al. Intestinal Afferent Nerve Sensitivity is Increased During the Initial Development of Postoperative Ileus in Mice. J Gastrointest Surg 13, 423–431 (2009). https://doi.org/10.1007/s11605-008-0789-z
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DOI: https://doi.org/10.1007/s11605-008-0789-z