Sigmoidoscopy done in which position?

SJH Nursing Officer - 2019

Medical Surgical Nursing

Easy

Appeared in: SJH Nursing Officer - 2019

Explanation

The knee-chest position involves the patient kneeling with their chest resting on the examination surface.
This position utilizes gravity to cause the sigmoid colon to fall forward and away from the rectum.
This movement straightens the natural curve of the rectosigmoid junction, providing a clearer and more direct path for the sigmoidoscope.
Improved visualization and easier passage of the instrument reduce patient discomfort and the risk of complications like perforation.

Option A: The lithotomy position is designed for access to the perineum and pelvic organs, not for optimal visualization of the sigmoid colon. The angle is not suitable for advancing a sigmoidoscope.
Option B: The Jack knife (or Kraske) position provides extreme flexion at the hips and is used for maximal exposure of the perianal region for surgery, not for internal examination of the colon.
Option C: Fowler's position is a semi-sitting position that is completely unsuitable for a lower gastrointestinal procedure as it does not provide access to the rectum or colon.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Patient Positioning for Endoscopic Procedures as background academic context rather than a clinical decision trigger.
Correct patient positioning is a critical nursing responsibility that directly impacts the success, safety, and comfort of a procedure. For sigmoidoscopy, improper positioning can lead to an incomplete examination or increase the risk of bowel perforation.
Nurses must be able to assist the patient into the correct position, provide adequate draping to maintain dignity, and offer physical and emotional support, as the knee-chest position can be uncomfortable and embarrassing for some.
What if the patient is elderly and has severe arthritis, making the knee-chest position impossible? The nurse should anticipate this and prepare for the alternative position, which is the left lateral (Sims') position. The nurse would assist the patient onto their left side with knees drawn toward the chest and have pillows ready for support.

How to Approach the Question

First, identify the core procedure mentioned in the question: 'Sigmoidoscopy'.
Recall the purpose of a sigmoidoscopy, which is to visualize the sigmoid colon, the lower part of the large intestine.
Consider the anatomy. The sigmoid colon has a natural 'S' curve. The goal of positioning is to straighten this curve as much as possible to allow the scope to pass easily.
Evaluate each option based on this goal. Think about how each position would affect the abdominal organs.
Eliminate positions clearly used for other body systems (e.g., Lithotomy for GYN/urology, Fowler's for respiratory).
Differentiate between the remaining options (Knee-chest vs. Jack knife) based on their primary use for examination versus surgery. The knee-chest position is the standard for this type of examination.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 210-212