Transcutaneous electrical nerve stimulation for acute pain.

Area of Science:

• Pain Management
• Neurology
• Rehabilitation Medicine

Background:

• Transcutaneous Electrical Nerve Stimulation (TENS) is a non-pharmacological method delivering low-voltage electrical currents to the skin for pain relief.
• This is an updated Cochrane Review assessing TENS as a standalone treatment for acute pain in adults.

Purpose of the Study:

• To evaluate the analgesic effectiveness of Transcutaneous Electrical Nerve Stimulation (TENS) when used as the sole treatment for acute pain in adults.
• To synthesize evidence from randomized controlled trials comparing TENS to placebo, no treatment, or other interventions.

Main Methods:

• Searched multiple databases (CENTRAL, MEDLINE, EMBASE, CINAHL, AMED) up to December 2014.
• Included randomized controlled trials (RCTs) of adults with acute pain (<12 weeks) using TENS as a sole treatment.
• Excluded trials involving experimental pain, combination therapies, or specific pain conditions like childbirth or dental procedures.

Main Results:

• Nineteen RCTs involving 1346 participants were included.
• TENS showed a statistically significant reduction in pain intensity compared to placebo (Mean Difference -24.62 mm on VAS).
• A significantly higher proportion of participants achieved ≥50% pain reduction with TENS versus placebo (Relative Risk 3.91).
• High risk of bias was noted due to inadequate sample sizes and unsuccessful blinding; minor adverse effects were reported.

Conclusions:

• Tentative evidence suggests TENS, as a standalone treatment, effectively reduces acute pain intensity more than placebo.
• Definitive conclusions are limited by a high risk of bias from methodological limitations, including small sample sizes and poor blinding.
• Incomplete reporting in many studies hinders trial replication and definitive evidence synthesis.