Perioperative bowel regimens following posterior spinal fusions for adolescent idiopathic scoliosis: a systematic review
Bibliographic record
Abstract
Background: Bowel morbidity after posterior spinal fusions (PSFs) for adolescent idiopathic scoliosis (AIS) delays the advancement of postoperative oral diet and discharge. This systematic review aims to investigate the effectiveness of perioperative bowel regimens in reducing length of stay and postoperative bowel morbidity in these patients. Materials and methods: We systematically searched MEDLINE, Embase, Cochrane, SPORTDiscus, and CINAHL for articles reporting on clinical results of PSFs for AIS patients. Demographic data, mean operative time and estimated blood loss, length of stay, time to first flatus and/or bowel movement, first oral intake, and postoperative pain scores were extracted from the selected studies. Results: Six articles (n = 468 patients) met the final inclusion criteria. Only one study, which assessed oral methylnaltrexone, reported a significant reduction in the mean hospital length of stay (0.60 days, P < 0.05) and postoperative abdominal distension (17% versus 40%, P < 0.05); however, it was also the only study to report a significantly increased mean operative time (38.9 min, P = 0.03) and estimated blood loss (111.1 mL, P = 0.05) compared to the treatment group. Time to flatus, regular diet, postoperative opioid consumption, and pain scores did not differ significantly in any of the reported studies. Conclusion: There is limited evidence to demonstrate any specific perioperative bowel regimen will decrease postpreparative bowel morbidity and/or length of stay. While not a treatment in isolation, oral methylnaltrexone may be a safe and effective adjunct to standard postoperative bowel regimens and may have a better patient tolerance profile.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.018 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.006 | 0.006 |
| Bibliometrics | 0.004 | 0.005 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".