Is bowel preparation before excretory urography necessary? A prospective, randomized, controlled trial

Area of Science:

• Radiology
• Gastroenterology
• Clinical Trials

Background:

• Intravenous pyelogram (IVP) is a common diagnostic imaging procedure.
• Bowel preparation is often performed before IVP to enhance visualization.
• The necessity and optimal method of bowel preparation for IVP remain debated.

Purpose of the Study:

• To evaluate the necessity of routine bowel preparations for satisfactory urinary system visualization during IVP.
• To compare the side effects of different bowel preparation methods.

Main Methods:

• A prospective, randomized, single-blind, controlled trial involving 200 patients undergoing IVP.
• Four groups received different bowel preparations: liquid supper, senna, magnesium sulfate, or PEG-ELS.
• Radiologists and urologists, blinded to preparation, assessed image quality (visualization, fecal residue, bowel gas, overall quality).

Main Results:

• No significant differences in image quality (contrast or control) were observed among the four groups.
• Senna and PEG-ELS groups showed lower fecal residue scores than the liquid supper group on control images.
• Laxative preparations (senna, magnesium sulfate, PEG-ELS) resulted in reported side effects, with no preference for re-ingestion among these groups.

Conclusions:

• Routine bowel preparation before IVP does not enhance overall image quality.
• Laxative bowel preparations may offer limited benefit for right renal region visualization on control images.
• Bowel preparations are associated with patient side effects, questioning the routine necessity.