Role of hydrogen peroxide injection for penetrating abdominal injury in creating CT Tractogram.

Penetrating abdominal trauma is responsible for approximately 35% of patients admitted to urban trauma centers, and up to 12% of those admitted in suburban or rural centers in the United States. Current protocol relies heavily on CT imaging as the diagnostic tool in evaluating for peritoneal violation in hemodynamically stable patients, however it is associated with false negative rates. In addition, visualization of the fascia of the rectus abdominis, the transversalis fascia, and the peritoneum cannot be reliably identified with CT. Studies have probed into the use of injecting IV contrast dyes prior to imaging to establish a CT tractography. We present a case of a 31-year-old male presenting to the emergency department for evaluation of stab wounds following an altercation. On exam, a 1 cm penetrating wound to the LUQ of his abdomen was noted. A CT scan of the abdomen and pelvis was performed with 91 mL of Omnipaque-350 intravenous contrast. Prior to imaging, 30 mL of hydrogen peroxide was injected directly into the opening site of the stab wound to amplify the wound tract. The result was a well-visualized intact peritoneum. We propose hydrogen peroxide as an alternative method to liquid contrast in reestablishing the stab wound tract. This method creates a negative contrast level to augment the ability of CT imaging to determine peritoneal penetration. Key Words: Penetrating Abdominal Injury, CT Tractography, Abdominal Trauma, Hydrogen Peroxide, Trauma Management.