American journal of physical medicine & rehabilitation
-
Am J Phys Med Rehabil · Nov 1997
Randomized Controlled Trial Comparative Study Clinical TrialThe immediate effectiveness of electrical nerve stimulation and electrical muscle stimulation on myofascial trigger points.
This study is designed to investigate the immediate effectiveness of electrotherapy on myofascial trigger points of upper trapezius muscle. Sixty patients (25 males and 35 females) who had myofascial trigger points in one side of the upper trapezius muscles were studied. The involved upper trapezius muscles were treated with three different methods according to a random assignment: group A muscles (n = 18) were given placebo treatment (control group); group B muscles (n = 20) were treated with electrical nerve stimulation (ENS) therapy; and group C muscles (n = 22) were given electrical muscle stimulation (EMS) therapy. ⋯ It could reduce PI significantly more (P < 0.05) than placebo controls only for the subgroup with mild to moderate pain, but not with severe pain. For pain relief, ENS was significantly better (P < 0.05) than EMS; but for the improvement of ROM, EMS was significantly better (P < 0.05) than ENS. It is concluded that ENS is more effective for immediate relief of myofascial trigger point pain than EMS, and EMS has a better effect on immediate release of muscle tightness than ENS.
-
Am J Phys Med Rehabil · Mar 1996
Randomized Controlled Trial Clinical TrialEffect of mexiletine on spinal cord injury dysesthetic pain.
Severe pain occurs in 5-30% of the spinal cord-injured (SCI) population and is difficult to treat. Subarachnoid lidocaine has been used in selected patients with some success. Mexiletine, an analog of lidocaine that acts at Na+/K+ channels in the peripheral nerve, has been found effective in persons with diabetic dysesthetic neuropathy. ⋯ The Wilcoxon's signed-rank test and paired t test were used for statistical analysis. Results showed no significant effect of mexiletine on SCI dysesthetic pain scales or Barthel index. In conclusion, in this trial, mexiletine did not appear to decrease spinal cord injury-related dysesthetic pain.
-
Am J Phys Med Rehabil · May 1995
Randomized Controlled Trial Clinical TrialTranscutaneous electrical nerve stimulation. Relevance of stimulation parameters to neurophysiological and hypoalgesic effects.
Although Transcutaneous Electrical Nerve Stimulation (TENS) has become a popular modality in pain management over the past 20 yr, there is still debate over its mechanisms of action and the precise relevance of stimulation parameters to its hypoalgesic effects. Thus, confusion still surrounds the selection of optimal stimulation parameters. ⋯ In addition, there was a high correlation (r = 0.9) between shifts in MPT and negative peak latency for the groups treated with this combination of TENS parameters. The results of this study thus illustrate that combinations of TENS parameters are important to the peripheral neurophysiological effects of this modality and, further, its associated hypoalgesic effects, at least on the model of pain used here.
-
Am J Phys Med Rehabil · Jul 1994
Randomized Controlled Trial Clinical TrialLidocaine injection versus dry needling to myofascial trigger point. The importance of the local twitch response.
This study was designed to investigate the effects of injection with a local anesthetic agent or dry needling into a myofascial trigger point (TrP) of the upper trapezius muscle in 58 patients. Trigger point injections with 0.5% lidocaine were given to 26 patients (Group I), and dry needling was performed on TrPs in 15 patients (Group II). Local twitch responses (LTRs) were elicited during multiple needle insertions in both Groups I and II. ⋯ Patients treated with dry needling had postinjection soreness of significantly greater intensity and longer duration than those treated with lidocaine injection. The author concludes that it is essential to elicit LTRs during injection to obtain an immediately desirable effect. TrP injection with 0.5% lidocaine is recommended, because it reduces the intensity and duration of postinjection soreness compared with that produced by dry needling.
-
Am J Phys Med Rehabil · Feb 1990
Randomized Controlled Trial Clinical TrialCan trials of physical treatments be blinded? The example of transcutaneous electrical nerve stimulation for chronic pain.
Therapeutic trials often attempt to "blind" patient and investigator to the true nature of treatments received, reducing the influences of conscious or subconscious prejudices. In drug trials, this is accomplished with placebo tablets, but blinding in trials of physical treatments is more problematic. This issue arose in a clinical trial of transcutaneous electrical nerve stimulation (TENS) for patients with chronic low back pain. ⋯ Clinicians guessed treatments correctly 61% of the time (as opposed to 50% expected by chance), again suggesting partial success in blinding. These efforts at blinding may partly explain the negative trial results for TENS efficacy. We conclude that complete blinding is difficult to achieve because of sensory difference in treatment and unintended communication between patient and examiner.(ABSTRACT TRUNCATED AT 250 WORDS)