A222 QUANTITATIVE ASSESSMENT TO DETERMINE CHANGES IN COLONIC CURVATURE WITH SUPINE VERSUS PRONE PATIENT POSITION USING COMPUTED TOMOGRAPHY COLONOGRAPHY
Notice bibliographique
Résumé
Dynamic positional changes during colonoscopy are commonly used in clinical practice, in particular moving from side to side. It has been shown to improve both adenoma detection rates as well as cecal intubation times. However, perhaps due to an additional level of inconvenience, there have been few studies comparing the anatomy and changes in colonic curvature when patients are in the prone position, which may help to prevent anterior bowing of the scope, particularly in patients with high abdominal circumference. To correlate changes in both the number of colonic curves and degree of change in curves with patients in supine versus prone positioning during computed tomography colonography (CTC). 104 CTC studies, obtained between January and April 2017 at Hotel Dieu Hospital in Kingston, Ontario, were screened and included based on image quality and adequacy of distention. Per standardized protocol, all patients undergoing CTC are imaged both in supine and prone positioning. Ten of these studies were then randomly selected for preliminary analysis (4 female and 6 male). Median age and BMI of these patients were 68.5 years (range 50–87 years) and 26.2 kg/m2 (range 21.9–34.1 kg/m2) respectively. Using an automated process developed for this study, curves were identified and measured via centerline points placed digitally through the colonic lumen, and compared between supine and prone patient positioning. Results were further stratified based on colonic segment (whole colon, ascending, transverse or descending). There were a significantly higher total number of curves in supine compared to prone positioning (P=0.006). When only the total number of curves containing ≥ 60 degrees of change in angulation were identified, there was no significant difference between supine and prone positioning, regardless of colonic segment (whole colon P=0.55; ascending P=0.62; transverse P=0.30; descending P=0.22). Likewise, there was no significant difference found when comparing the mean degree of change in angulation between the two positions (whole colon P=0.58; ascending P=0.53; transverse P=0.97; descending P=0.25). Based on our preliminary analysis of ten patients, there are more curves found in supine positioning compared to prone, but no significant differences were found between the two positions when only more acute angles are included. Based on these results, we will complete analysis of the remaining CTC studies. We expect that with a larger sample size, more significant differences will become evident. None
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,002 | 0,005 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,003 | 0,002 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,004 | 0,001 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».