Certified Neuroscience Registered Nurse (CNRN) Practice Exam

What percentage of mechanical obstructions are of small bowel origin?

1. 40%

2. 60%

3. 80%

4. 100%

The correct answer is: 80%

Mechanical obstructions in the gastrointestinal tract can arise from various causes, and it is essential to differentiate the source of these obstructions for effective diagnosis and treatment. In the case of mechanical obstructions, studies indicate that a significant proportion—approximately 80%—is attributed to the small bowel. This predominance is often due to various factors, such as adhesions, hernias, and tumors, which are more common in the small intestine compared to the large intestine. Understanding that 80% of mechanical obstructions originate from the small bowel helps healthcare professionals prioritize their assessment and treatment interventions. The remaining options reflect lower percentages, which do not align with the established data regarding the prevalence of small bowel obstructions compared to those originating from the large bowel or other areas. Hence, the correct answer highlights the critical understanding of the epidemiology of mechanical obstructions, underscoring the importance of evaluating small bowel involvement in patients presenting with intestinal obstruction symptoms.