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Related Experiment Videos

New predictor for the defecatory function after sphincter-preserving operation: lumen score.

Toshihiko Yagyu1, Tetsuhisa Yamamoto, Hidetaka Mochizuki

  • 1First Department of Surgery, National Defense Medical College, 3-2 Namiki, Saitama 359-8513, Japan.

World Journal of Surgery
|March 19, 2002
PubMed
Summary

The lumen score (LS), a measurement of sigmoid colon diameter, predicts bowel function after rectal cancer surgery. A higher LS indicates better outcomes, suggesting its utility in planning colonic J pouch reconstruction.

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Area of Science:

  • Colorectal Surgery
  • Surgical Oncology
  • Gastroenterology

Background:

  • Sphincter-preserving surgery for rectal cancer requires optimal anastomotic segment selection.
  • Predicting postoperative defecatory function remains a challenge.

Purpose of the Study:

  • To evaluate the usefulness of the lumen score (LS), calculated from sigmoid colon diameter, as a predictor of defecatory function after very low anterior resection (VLAR).

Main Methods:

  • LS was measured via radiography in 24 patients undergoing VLAR (17 straight coloanal reconstruction [VLAR-S], 7 colonic J pouch reconstruction [VLAR-J]).
  • Patients were assessed >6 months post-operation, analyzing neorectal capacity, anal manometry, and defecatory function.
  • VLAR-S patients were stratified into high-LS (≥12 cm²) and low-LS (<12 cm²) groups.

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Main Results:

  • LS positively correlated with neorectal capacity (gamma = 0.81, p <0.01) and negatively with bowel frequency (gamma = -0.67, p <0.05) in VLAR-S patients.
  • The high-LS group exhibited significantly greater neorectal capacity (118.0 ml) than the low-LS group (88.3 ml; p <0.05).
  • The low-LS group experienced poorer defecatory function compared to the high-LS group, whose function was comparable to VLAR-J patients.

Conclusions:

  • The lumen score (LS) is a valuable predictor of neorectal capacity and defecatory function following VLAR.
  • LS can guide the selection of patients likely to benefit from colonic J pouch reconstruction, optimizing surgical outcomes.