Review article: Non-fatal strangulation: Hidden injuries, hidden risks.

Non-fatal strangulation (NFS) can be a cause of severe injury. However, the prevalence and rates of injuries from NFS are unknown, as few victims present to medical attention after strangulation. As up to 40% of fatal strangulations have no external signs, and the majority of surviving victims have few or minor injuries, finding those people severely injured remains challenging. The majority of the evidence regarding NFS is largely based on case reports and case series with no robust studies estimating rates of injuries or the best investigation tools. The injuries that are reported make clear that strangulation is a potentially lethal form of injury that should not be ignored in those presenting having been strangled, or in those presenting with neurological symptoms, including strokes, seizures and vascular abnormalities. The safety implications of strangulation are also important as it can be a prelude to homicide. A search of the literature was carried out with the following terms: Nonfatal strangulation (10), Nonfatal strangulation (17), 'Strangulation injuries' (19), 'Manual strangulation' (92) - laboratory testing eliminated, and 'choking game'. The PubMed database was used first, followed by the collections of Monash University and the Strangulation Institute (as some articles were too old to find electronically). This article summarises the injuries that can occur following strangulation and discusses the quality of the evidence thus far.