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Introduction: Peripheral nerve injuries commonly result from trauma and can lead to devastating loss of sensory and motor function. A novel strategy to improve peripheral nerve regeneration is a chemical fusogen known as polyethylene glycol (PEG). Several animal studies have illustrated PEG’s potential to help prevent axon loss after peripheral nerve injury. However, the relative rate of success and potential complications of these studies have not been definitively shown in the literature. The purpose of this systematic review is to evaluate the literature regarding the success of PEG adjunct treatment after peripheral nerve injury in preclinical models.  Materials and Methods:  The MEDLINE database was queried using the PubMed search engine with the following keywords and phrases: “polyethylene glycol” OR “PEG” AND “nerve” AND “fusion”. All resulting articles were screened by two reviewers. Animal type, nerve type, injury type, type(s) of analyses, and overall superiority of outcomes were assessed.  Results: One-hundred and seventy-nine articles were identified, and thirteen studies remained after the application of inclusion and exclusion criteria. Twelve of the thirteen studies utilized rats as the preclinical model, while one utilized a guinea pig. Superiority of peripheral nerve repair outcomes with adjunct PEG treatment compared to a control group was reported in eleven of thirteen studies. Conclusions:  The majority of studies reported positive outcomes when using PEG; this indicates that PEG treatment has the potential to enhance peripheral nerve regeneration after injury. However, the results of some of these studies indicated several uncertainties that need to be addressed in future studies. These preclinical models may help guide clinicians regarding the use of PEG treatment in peripheral nerve repair.

Polyethylene Glycol Treatment for Peripheral Nerve Repair in Preclinical Models