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Symmetrical biphasic TENS waveform for the treatment of back pain
Lampe J, Dunn B
The Clinical Journal of Pain 1987 Sep;3(3):145-151
clinical trial
1/10 [Eligibility criteria: No; Random allocation: No; Concealed allocation: No; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: No. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

A TENS using an experimental, symmetrical biphasic waveform was used to treat 65 back pain patients. The control was conventional high rate transcutaneous electrical nerve stimulator (TENS) administered every other day in a 5-day crossover study. Visual analog scales were used to evaluate pain before and after treatment. Daily patient interviews were used to compare the length of carryover pain relief after treatment. The carryover pain relief with the new waveform was found to be longer, p < 0.01. Patients preferred the new waveform over the conventional TENS, p < 0.05. The new waveform pain relief was greater, but not statistically significant, p = 0.07. The sensation of the new waveform in its present form was judged slightly less pleasant by some patients.

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