Endoscopy and Gastrointestinal Procedures
Core concepts
Endoscopy questions test preparation, sedation, complications, and appropriate use. Colonoscopy preparation quality determines adenoma detection; split-dose bowel prep is standard, and inadequate prep should prompt rescheduling rather than a compromised exam. Anticoagulation and antiplatelet management must be individualized by bleeding and thrombotic risk, not stopped reflexively.
Know the spectrum of sedation: moderate sedation with benzodiazepine and opioid versus propofol, which requires airway-trained personnel. Recognize post-procedure complications: post-polypectomy bleeding, perforation (pain, fever, leukocytosis), and post-ERCP pancreatitis. For upper endoscopy, identify indications for urgent endoscopy (variceal hemorrhage, active bleeding) versus elective evaluation of dyspepsia.
Screening intervals and surveillance follow evidence-based guidance: average-risk colorectal cancer screening begins at 45 in current U.S. guidance, and surveillance intervals after polypectomy depend on polyp number, size, and histology. Do not over-surveil low-risk findings.
Traps
Stems may describe a patient on clopidogrel after recent stent placement; stopping the drug for a routine screening colonoscopy is usually the wrong answer. Another trap is confusing a diagnostic study with a therapeutic one: a normal upper endoscopy does not exclude small-bowel bleeding. Questions also test who needs anesthesia support rather than moderate sedation.
Rule of thumb
If the prep is poor or the indication is purely screening in a stable patient, optimize and reschedule rather than accept a low-quality exam.
Worked example
A patient on dual antiplatelet therapy after recent coronary stenting is due for screening colonoscopy. Defer or coordinate with cardiology; do not unilaterally stop antiplatelet therapy for a screening study.