Objective
Venous thromboembolism (VTE), encompassing deep vein thrombosis (DVT) and pulmonary embolism (PE), is a significant cause of morbidity and mortality, affecting 1 in 1000 adults per year. Neuromuscular electrical stimulation (NMES) is the transcutaneous application of electrical impulses to elicit muscle contraction, preventing venous stasis. This review aims to investigate the evidence underlying the use of NMES in thromboprophylaxis.

Methods
The Medline and Embase databases were systematically searched, adhering to PRISMA guidelines, for articles relating to electrical stimulation and thromboprophylaxis. Articles were screened according to a priori inclusion and exclusion criteria.

Results
The search strategy identified 10 randomised controlled trials, which were used in three separate meta-analyses; 5 trials compared NMES to control, favouring NMES (odds ratio (OR) of DVT 0.29, 95%CI 0.13-0.65; P=.003); 3 trials compared NMES to heparin, favouring heparin (OR of DVT 2.00, 95%CI 1.13-3.52; P=.02); 3 trials compared NMES as an adjunct to heparin versus heparin only, demonstrating no significant difference (OR of DVT 0.33, 95%CI 0.10-1.14; P=.08).

Conclusion
NMES significantly reduces the risk of deep vein thrombosis compared to no prophylaxis. It is inferior to heparin in preventing DVT and there is no evidence for its use as an adjunct to heparin.