Reduced paraspinous muscle area is associated with post-colectomy complications in children with ulcerative colitis

Area of Science:

• Pediatric Surgery
• Gastroenterology
• Radiology

Background:

• Sarcopenia, characterized by reduced muscle mass, is typically assessed via CT scans, which are infrequently used in pediatric populations.
• Assessing sarcopenia preoperatively in children undergoing colectomy for ulcerative colitis (UC) is challenging.
• Magnetic Resonance Imaging (MRI) offers a potential alternative for evaluating muscle mass in this demographic.

Purpose of the Study:

• To investigate the association between sarcopenia, measured by MRI-derived muscle area, and postoperative complications in pediatric patients with UC following colectomy.
• To determine if preoperative muscle mass metrics can predict surgical outcomes in this patient group.

Main Methods:

• Retrospective review of clinical and preoperative MRI data from 29 UC patients aged 13-18 years who underwent colectomy.
• Measurement of bilateral paraspinous muscle area (PSMA) and psoas muscle area (PMA) at the L3 vertebral level.
• Definition of composite complications including infection, wound dehiscence, leak/abscess, prolonged ileus, and readmission.

Main Results:

• Patients experiencing complications (62%) exhibited significantly reduced PSMA and PMA compared to those without complications (p=0.04).
• Lowest PSMA tertile was associated with an 88% complication rate versus 29% in the highest PSMA tertile (p=0.04).
• The odds of complication were 25.0-fold higher in the lowest PSMA tertile compared to the highest (p=0.04).

Conclusions:

• This study is the first to demonstrate that low PSMA, assessed via MRI, is significantly associated with increased postoperative complications and potentially longer hospital stays in pediatric UC patients after colectomy.
• Preoperative MRI assessment of muscle mass, specifically PSMA, may serve as a valuable tool for risk stratification in pediatric colectomy for UC.