Carbon dioxide gas pneumoperitoneum induces minimal microcirculatory changes in neonates during laparoscopic pyloromyotomy
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Little is known about the direct effect of pneumoperitoneum (PP) on microcirculation and its influence on the quality of tissue perfusion. This study aimed to investigate the intraoperative effects of carbon dioxide (CO2) gas PP on microcirculation density and perfusion in neonates receiving laparoscopic surgery for hypertrophic pyloric stenosis.
In a single-center observational study, the oral microcirculation in 12 neonates receiving laparoscopic pyloromyotomy was investigated. Intraoperative hemodynamic parameters, intermittent buccal mucosa capillary density measurements (pre- and postoperative), and continuous intraoperative sublingual microcirculation measurements (i.e., vessels with a diameter <25 μm) of total vessel density, perfused vessel density, proportion of perfused blood vessels, blood vessel diameters (BVd), and microvascular flow index were obtained before (at baseline), during, and after PP insufflation for all patients using sidestream dark-field imaging for the duration of the complete surgical procedure.
With the exception of a significantly elevated end-tidal CO2 (34 ± 4–40 ± 8 mmHg; p < 0.05 vs before [baseline], one-way analysis of variance [ANOVA]) during intraoperative insufflation, no significant differences were found between time points for the intraoperative hemodynamic parameters. Pre- and postoperative buccal capillary density showed no significant changes in mucosal perfusion. Analysis of continuous intraoperative sublingual microcirculation parameters exhibited a statistically significant increase in BVd during insufflation (8.8 ± 2.4–9.3 ± 2.5 μm; p < 0.05, one-way ANOVA) and a significant decrease after exsufflation (8.2 ± 2.3 μm; p < 0.01 vs during insufflation and p < 0.05 vs baseline, one-way ANOVA, respectively). No other significant differences were found between time points for the remaining microcirculatory parameters.
The installation of CO2 gas PP during laparoscopic pyloromyotomy procedures regulates microcirculatory perfusion by inducing changes in microvascular diameters but does not alter microcirculation density in neonates.
KeywordsLaparoscopy Microcirculation Neonate Pneumoperitoneum SDF imaging
We acknowledge and thank all the families who kindly consented to participate in this study. We are grateful to the anesthesiologists and operating theater staff for their cooperation and support for this investigation.
Can Ince is the inventor of the SDF imaging technique and as such holds patents on this technology. Stefaan H. A. J. Tytgat, David C. van der Zee, and Dan M. J. Milstein have no conflicts of interest or financial ties to disclose.
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