Surgical delay in abdominal based flap surgery: a scoping review.

Background: The abdominal donor site is the most common flap used for breast reconstruction, with flap necrosis a feared complication. The technique of surgical 'delay' involves the inducing of relative ischemia to promote neovascularisation, amongst other metabolic adaptations, and has been used to augment flap vascularity and reduce this complication. There is significant variability in the manner in which flap surgery and surgical delay may be performed, such as the vessels ligated, the presence and degree of flap elevation, and the decision to harvest muscle with the flap, amongst other factors. A formal review of techniques, however, has not yet been performed, and there is no consensus as to the optimal technique for surgical delay. Methods: A scoping review of the current literature was undertaken to determine the optimal surgical delay technique in abdominal-based flap surgery. A literature search was conducted across PubMed, Embase, Cochrane, and Medline databases. Data regarding the type of flap surgery, delay techniques, and corresponding clinical outcomes was collected and categorised by technique type. Results: Nine studies met the inclusion criteria and were included for review. Levels of evidence and rates of complications were compared. The range of surgical delay techniques reported in the literature was described. Surgical delay was found to reduce overall complication rates, and the available data suggests it may be particularly beneficial in high-risk patients. Conclusions: The current data support delay as a viable method for reducing rates of complications. Further studies and data are required to compare surgical delay techniques and determine the benefit delay may pose to patients with risk factors.