Gastrectomy Causes an Imbalance in the Trunk Muscles

Area of Science:

• Oncology
• Surgical Gastroenterology
• Rehabilitation Medicine

Background:

• Muscle loss (sarcopenia) negatively impacts prognosis after gastrectomy.
• Previous research focused on systemic muscle changes, overlooking individual muscle dynamics.
• Understanding specific muscle alterations post-surgery is crucial for personalized rehabilitation.

Purpose of the Study:

• To investigate changes in individual trunk muscle volumes after gastrectomy for early-stage gastric cancer.
• To identify potential prognostic factors and inform optimal rehabilitation strategies.
• To assess the relationship between muscle volume changes and nutritional status.

Main Methods:

• Retrospective analysis of 59 patients undergoing R0 gastrectomy for Stage I gastric cancer.
• Computed tomography (CT) scans used for body composition analysis and trunk muscle volume measurement.
• Statistical analysis to identify risk factors and compare pre- and post-operative muscle conditions (6 months).

Main Results:

• No significant change was observed in the psoas major muscle, a common sarcopenia marker.
• Significant decreases were noted in erector spinae and lateral abdominal muscles (p=0.01).
• A significant increase was observed in the rectus abdominis muscle (p=0.02), with no correlation to nutritional status.

Conclusions:

• Post-gastrectomy body composition imbalance, indicated by specific muscle changes, may be a novel prognostic indicator.
• Targeted rehabilitation focusing on correcting these muscle imbalances could potentially improve patient prognosis.
• Individual muscle assessment offers valuable insights beyond traditional sarcopenia markers for post-gastrectomy care.