Enzymatic responses to skin flap elevation following a delay procedure

Area of Science:

• Biochemistry
• Surgical Research
• Tissue Engineering

Background:

• Skin flap elevation involves complex metabolic changes.
• Understanding glucose metabolism is key to improving flap viability.

Purpose of the Study:

• To investigate alterations in glucose metabolism enzyme activities in delayed skin flaps.
• To determine the relationship between enzyme activity, glucose levels, and flap survival.

Main Methods:

• Enzyme activities (hexokinase, pyruvate kinase, lactate dehydrogenase, glucose 6-phosphate dehydrogenase, isocitrate dehydrogenase, malate dehydrogenase) were measured in guinea pig skin flaps.
• Flaps were analyzed at various delay periods (3, 7, 14, 21 days) before elevation.

Main Results:

• Glycolytic enzyme activities increased during the delay period.
• Elevated enzyme activities were maintained or further increased in flaps delayed for 7-21 days.
• Flaps elevated early (3 days) showed partial necrosis despite high enzyme activity, linked to low glucose levels.

Conclusions:

• Tissue glucose levels and utilization are critical determinants of skin flap survival.
• Metabolic adaptations during the delay period influence flap outcome.
• Early elevation may lead to necrosis due to insufficient glucose availability.