This trial's primary objective is to compare the analgesic efficacy of esketamine in combination with pulsed radiofrequency (PRF) of dorsal root ganglion(DRG) against that of PRF monotherapy in patients with postherpetic neuralgia(PHN).
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The primary comparison is the difference between the means of the daily mean pain scores over the first 7 days, measured on an 11-point NRS
Timeframe: 7-day period