Management of Intractable Painful Diabetic Peripheral Neuropathy: The Perspective of a Pain Specialist

Peripheral neuropathy is one of the most common complications of both type 1 and type 2 diabetes. The most common diabetic neuropathy (DN) is distal symmetric polyneuropathy, with characteristic glove- and stocking-like presentation of distal sensory or motor function loss. Because painful DN is associated with increased mortality and morbidity, early recognition and preventive measures are essential. Nevertheless, diagnosing DN or painful DN is challenging, particularly in patients with early and mild neuropathy, and there is no established gold standard. Furthermore, there is no established DN treatment other than improved glycemic control, and only symptomatic management is available for painful DN. However, thanks to health-conscious living, almost one-third of patients with painful DN derive sufficient pain relief with existing pharmacotherapies. These include antidepressants (tricyclic acid, serotonin-norepinephrine reuptake inhibitor), anticonvulsants (calcium-channel blocker, sodium channel blocker), and others (sarpogrelate). A more precise and distinct symptom profile from patients with painful DN may help identify patients more responsive to one treatment versus another. In addition to pharmacological, physical, cognitive, or educational management for painful DN, large randomized clinical trials are needed to identify the most effective minimally invasive interventions. Transcutaneous electrical nerve stimulation, pain scrambler therapy, sympathetic ganglion block, and botulinum toxin injections have been investigated as alternative therapeutic outcomes.