ASCRS Ch04 — Endoscopy

Citation: Zelhart MD, Kann BR. "Endoscopy." In: Steele SR, et al. (eds.), The ASCRS Textbook of Colon and Rectal Surgery, 4th ed. Springer Nature Switzerland AG; 2022. pp. 51–77 (PDF pp. 67–93 of the combined textbook file). Source file: raw/ASCRS Textbook 4th Ed.pdf (full 1,198-page textbook; cite by page range within the single PDF).

Type: Specialty textbook chapter (reference/background, not primary literature). Notably technique/practice-management-heavy relative to the first three chapters.

Scope

Fourth chapter of the sequential full-textbook ingest (see ASCRS Ch01 - Anatomy and Embryology for the ingest's scope/plan). Covers the anorectal exam (positioning, DRE, anoscopy, rigid proctoscopy, EAUS/ERUS), flexible endoscopy technique fundamentals, flexible sigmoidoscopy, colonoscopy in full (bowel prep, sedation, instrumentation, procedural technique/landmarks, alternative insufflation/imaging-enhancement techniques, difficult exams, incomplete colonoscopy, complications), endoscopy-unit operations (reprocessing, efficiency), quality measures (withdrawal time, ADR), the lease-vs-purchase equipment decision, and endoscopy training/simulation.

Key content

Full synthesis written into the new procedure page Colonoscopy & Lower GI Endoscopy rather than summarized twice here. Notably long and diverse relative to prior chapters — spans clinical technique, quality metrics, and practice-management topics (equipment leasing, endoscopy suite efficiency) not previously represented anywhere in this wiki.

Limitations

• Textbook chapter, not primary literature; cites but does not independently verify the trial/study figures given for ADR benchmarks, bowel-prep comparisons, propofol safety, and perforation/bleeding rates.
• Some quality-metric limitations are acknowledged by the chapter itself (withdrawal time is "easily manipulated," ADR criteria are debated, malignancy/polyp detection rates are inferior alternatives) rather than resolved.

Relevance

Fourth entry in the ASCRS ingest, and the first chapter of this ingest to be primarily technique/practice-focused rather than anatomy/physiology-focused. Creates Colonoscopy & Lower GI Endoscopy, quantifies ERUS staging accuracy already referenced qualitatively on Rectal Cancer, strengthens Anorectal Physiology Testing's EAUS entry, and adds colonoscopic-perforation risk-factor cross-references to Diverticulitis (and implicitly Ischemic Colitis, Ulcerative Colitis, Crohn Disease — all named as perforation/technique risk factors or chromoendoscopy-surveillance-relevant conditions in the new page, though those pages were not individually edited this round).