Abstract
Background
Scanning electron microscopy is unable to provide sufficient data to obtain definitive results for research into the morphologic effect of pneumoperitoneum on peritoneum. To overcome this difficulty, we adopted stereology to examine the effect of the type of gas insufflated, pressure, duration, and gas flow on morphologic alterations of peritoneum.
Methods
Fifty SD rats were divided into ten groups. One group served as control. Pneumoperitoneum was established at 5 mmHg and 1.0 l/min gas flow for 1, 2 or 3 h with CO2 (in groups C1h, C2h, and C3h, respectively) or with He (in groups H1h, H2h, and H3h, respectively). CO2 pneumoperitoneum was further established at 8 mmHg and 1.0 l/min gas flow for 1 h (group C8p), at 5 mmHg and 2.0 l/min gas flow for 1 h (group C2f), and at 5 mmHg and 3.0 l/min gas flow for 1 h (group C3f). After the procedures, five specimens were sampled from anterior peritoneum and measured by stereological and electron-microscopic techniques.
Results
Groups H1h and C1h, H2h and C2h, and H3h and C3h, respectively, were the same in terms of area fraction of basal lamina exposed and diameter of mesothelial cells (P > 0.05). The magnitudes of peritoneal trauma in groups C2h, C3h, C8p, C2f, and C3f were significantly higher than that in group C1h (P < 0.01), and the same result was observed in groups H2h and H3h against group H1h (P < 0.01), and in group C3f against group C2f (P < 0.01). Furthermore, the area fractions of basal lamina exposed in groups C3h and H3h were remarkably higher than those in groups C2h and H2h, respectively (P < 0.01). The mechanism of basal lamina exposure comprises mesothelial cell desquamation and plasmatorrhexis.
Conclusions
Peritoneal morphologic trauma during pneumoperitoneum can be attributed to the pressure, duration, and gas flow instead of the type of gas insufflated.
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Acknowledgments
The authors gratefully thank Prof. Yong Tang for stereological support. This work was supported by the Natural Science Foundation of China (NSFC 30972875) and the Natural Science Foundation of Chongqing Government (SCTC, 2009AB5035).
Disclosures
Authors Jiang Du, Pei-wu Yu, and Bo Tang have no conflicts of interest or financial ties to disclose.
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Du, J., Yu, Pw. & Tang, B. Application of stereology to study the effects of pneumoperitoneum on peritoneum. Surg Endosc 25, 619–627 (2011). https://doi.org/10.1007/s00464-010-1235-3
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DOI: https://doi.org/10.1007/s00464-010-1235-3