Fecal Impaction Diagnosis in Bedridden Patients

Clinical Presentation and Risk Factors

• Immobility is a primary risk factor for fecal impaction, which dramatically slows gastrointestinal motility in bedridden patients 1
• Sigmoid volvulus typically occurs in elderly institutionalized patients, but presents more acutely than fecal impaction, making it less common in this population 1, 2
• Colorectal cancer would typically have a more gradual onset with warning signs, making it less likely as the primary diagnosis after a fall 3

Diagnostic Approach

• Digital rectal examination can immediately identify a fecal impaction in 80% of cases, and is both diagnostic and potentially therapeutic, although no citation is provided for this fact, CT abdomen/pelvis is the gold standard with approximately 90% accuracy for identifying the level and cause of obstruction 3
• Plain radiographs have limited value (50-60% sensitivity) and may delay definitive diagnosis 3