Background
The risk of flap necrosis in tissue reconstruction surgery is elevated in patients with vascular disorders, such as diabetes mellitus. Chronic hyperglycaemia causes endothelial cell dysfunction and increases inflammatory process, causing vascular insufficiency. Platelet-rich plasma (PRP) contains high levels of platelets, growth factors and fibrinogens. Its regenerative properties spark interest in supporting flap survival in relation to diabetic complications.
Methods
Thirty Wistar rats were divided into three groups. The first group included diabetic rats without PRP injection, which underwent flap procedure. The second group included diabetes-induced rats receiving PRP subcutaneous injection one day prior to flap procedure. The third group included non-diabetic rats receiving PRP injection one day prior to flap procedure. Flap tissue samples were taken on the seventh day to measure VEGF levels using enzyme-linked immunosorbent assay (ELISA) method; angiogenesis and collagen density were measured from histopathology examination, and flap viability was analysed using digital measurements.
Results
Analysis showed that flap viability, angiogenesis and VEGF levels were significantly higher in the PRP-injected diabetic rats compared to diabetic rats that did not receive PRP. The levels of VEGF, angiogenesis and viability of flaps in diabetic rats given PRP did not differ significantly compared to non-diabetic rats that received PRP.
Conclusion
Flap preconditioning through local injection of activated PRP enhances flap viability, VEGF levels and angiogenesis, in random skin flaps in diabetic rats, to the level where it does not differ significantly to non-diabetic rats that were given PRP.
Keywords.
Platelet-rich plasma, diabetes mellitus, VEGF, angiogenesis, random skin flap