Metabolic adaptations in delayed skin flaps. Glucose utilization and hexokinase activity

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Wound Healing Research

Background:

• Delayed bipedicled skin flaps are crucial in reconstructive surgery.
• Understanding the metabolic changes during the delay period is vital for optimizing flap survival.

Purpose of the Study:

• To investigate the distribution of glucose and hexokinase activity in delayed bipedicled skin flaps.
• To correlate metabolic changes with flap survival rates.

Main Methods:

• Guinea pigs underwent bipedicled skin flap elevation after delay periods of 1, 3, 7, 14, or 21 days.
• Epithelial glucose levels and hexokinase activity were measured.
• Flap survival was assessed macroscopically.

Main Results:

• Maximal flap survival (100%) was observed when elevation occurred 7 or 14 days post-delay.
• Partial necrosis resulted from elevation at 1, 3, or 21 days.
• Glucose levels were lowest early in the delay period and recovered over time.
• Hexokinase activity increased during the delay period, inversely correlating with glucose levels in the caudal flap half.

Conclusions:

• The timing of flap elevation relative to the delay procedure significantly impacts survival.
• Reciprocal changes in glucose metabolism and hexokinase activity are key indicators of flap viability during the delay phenomenon.