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LETTER TO EDITOR
  
Year : 1998  |  Volume : 64  |  Issue : 1  |  Page : 45-47

Transcutaneous electrical nerve stimulation in treatment of post herpetic neuralgia

A Mittal, BL Masuria, P Bajaj 
 

Correspondence Address:
A Mittal





How to cite this article:
Mittal A, Masuria B L, Bajaj P. Transcutaneous electrical nerve stimulation in treatment of post herpetic neuralgia.Indian J Dermatol Venereol Leprol 1998;64:45-47


How to cite this URL:
Mittal A, Masuria B L, Bajaj P. Transcutaneous electrical nerve stimulation in treatment of post herpetic neuralgia. Indian J Dermatol Venereol Leprol [serial online] 1998 [cited 2020 Apr 1 ];64:45-47
Available from: http://www.ijdvl.com/text.asp?1998/64/1/45/4645


Full Text

 To the Editor



Various neurological problems may complicate herpes zoster of which post herpetic neuralgia is the most important in terms of chronic morbidity.

The pain of PHN is typically described as a constant burning discomfort on which may be superimposed intermittent lancinating pain and dysaesthesia.[1] Treatment of PHN has been subject of various reviews.[2, 3] TENS is a non-invasive procedure which has been used in chronic pain. It has as its rationale the gate control theory of pain.[4] We attempted this form of therapy in 10 patients of post herpetic neuralgia of either sex. Age of patient varied from 30-45 years: mean duration of PHN was 4 months. None of the patients had received oral acyclovir or systemic steroids as part of their herpes zoster treatment. All of them were prescribed single non-steroidal anti-inflammatory drug (ibuprofen 400 mg + paracetamol 325 mg) for neuralgia before they were taken up for TENS therapy. Informed consent was obtained after the procedure had been fully explained: TENS therapy was given with Ts 8000 P stimulator. Two electrodes were placed on near the most painful area or over the related nerve. Frequency of stimulation was adjusted to 70 Hz and pulse width to 0.2 amplitude was gradually increased to produce the maximum tolerable paraesthesia but not causing muscle contraction or fasiculation. Stimulation was scheduled daily for 20 minutes period for 10 days.

Assessment of pain relief was done after last day of treatment using a pain rating scale score as follows:

1. Total pain relief, no an algesic required- 75%

2. Occasional slight pain but no analgesic required 51 -75%

3. When analgesic required occasionally and in reduced quantity 26-50%

4. Slight reduction in pain 25%

After 10 days of TENS therapy, following results were obtained. Two patients showed pain relief 25%, 2 patients had a score of 25-50%, 4 patients had a score of 51-75% and 2 patients a score of 75%.

Thus 6/10 patients (60%) reported 50% or more reduction in pain following TENS therapy, individual data revealed that patients with a shorter duration of neuralgia responded better to TENS.

The exact mechanism of action of TENS is not known. Various studies have shown that electrical stimulation of segmental cutaneous. A beta fibres selectively, inhibits C fibres. `A' fibre stimulation also activates some descending inhibitory pathways from brainstem.[5] Our results indicate that TENS appears to have a beneficial role in PHN and may be worth a trial in view of lack of adverse effects and inconsistent results even with other available modes of therapy.

References

1Watson CPN, Evans RJ Watt VR et at. Postherpetic neuralgia - 208 cases. Pain 1988; 35:289-297.
2Loeser JD. Herpes zoster and postherpetic neuralgia Pain 1986; 25: 149-164.
3Watson PN, Evans RJ. Postherpetic neuralgia a review. Arch Neurol 1986; 43: 836-840.
4Metzac R, Wall PD Pain mechanism. a new theory Science 1965 150: 971-979.
5Bhatia P, Joshi V, Garg O P. Transcutaneous electrical nerve stimulation in the treatment of myofascial pain of short and long duration Ind J Anaesthesia 1954:42:37.

 

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