Advancements and Controversies in Regional Anesthesia: A Review.

Regional anesthesia offers benefits such as improved pain control and reduced opioid use, but controversies remain regarding techniques and outcomes. This review examines key debates in the field, including the necessity of circumferential spread of local anesthetics, the impact of regional anesthesia on diagnosing compartment syndrome, the choice of diluent, and the safety of performing peripheral nerve blocks (PNBs) in awake versus anesthetized patients. To explore these topics, we conducted a literature search to synthesize relevant studies and expert perspectives, offering a comprehensive analysis of current evidence. While circumferential spread may enhance block onset, studies show that it does not consistently improve success. The potential for regional anesthesia to mask compartment syndrome is not definitively supported, as ischemic pain often breaks through analgesia. Dextrose diluents accelerate sensory block onset compared to saline, though effects vary with different anesthetics. In awake versus anesthetized PNBs, sedation and general anesthesia provide safety and comfort, especially for non-cooperative patients, with no clear superiority. Overall, regional anesthesia techniques should be tailored to individual patient needs, and further research is necessary to refine best practices.