Abstract：
BACKGROUND:Latent varicella zoster virus reactivates mainly in sensory ganglia such as the dorsal root ganglion (DRG) or trigeminal ganglion. The DRG contains many receptor channels and is an important region for pain signal transduction. Sustained abnormal electrical activity to the spinal cord via the DRG in acute herpes zoster can result in neuropathic conditions such as postherpetic neuralgia (PHN). Although the efficacy of pulsed radiofrequency (PRF) application to the DRG in various pain conditions has been previously reported, the application of PRF to the DRG in patients with herpes zoster has not yet been studied. OBJECTIVES:The aim of the present study was to compare the clinical effects of PRF to the DRG in patients with herpes zoster to those of PRF to the DRG in patients with PHN. STUDY DESIGN:Retrospective comparative study. SETTING:University hospital pain center in Korea. METHODS:The medical records of 58 patients who underwent PRF to the DRG due to zoster related pain (herpes zoster or PHN) were retrospectively analyzed. Patients were divided into 2 groups according to the timing of PRF after zoster onset: an early PRF group (within 90 days) and a PHN PRF group (more than 90 days). The efficacy of PRF was assessed by a numeric rating scale (NRS) and by recording patient medication doses before PRF and at one week, 4 weeks, 8 weeks, and 12 weeks after PRF. RESULTS:Pain intensity was decreased after PRF in all participants. However, the degree of pain reduction was significantly higher in the early PRF group. Moreover, more patients discontinued their medication in the early PRF group, and the PRF success rate was also higher in the early PRF group. LIMITATIONS:The relatively small sample size from a single center, short duration of review of medical records, and the retrospective nature of the study. CONCLUSIONS:PRF to the DRG is a useful treatment for treatment-resistant cases of herpes zoster and PHN. Particularly in herpes zoster patients with intractable pain, application of PRF to the DRG should be considered for pain control and prevention of PHN.Key words: Pulsed radiofrequency, dorsal root ganglion, herpes zoster, postherpetic neuralgia.
journal_name
Pain Physicianjournal_title
Pain physicianauthors
Kim K,Jo D,Kim Esubject
Has Abstractpub_date
2017-03-01 00:00:00pages
E411-E418issue
3eissn
1533-3159issn
2150-1149journal_volume
20pub_type
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