Postherpetic neuralgia is defined as pain lasting beyond how many weeks?
(A) 1 week (B) 2 weeks (C) 3 weeks (D) 4 weeks
(D) Ans: D. 4 weeks(Ref Fitzpatrick 6/e p2302, 7/e p490-493, 1873-1898; Rooks 8/e p33.14-33.22; Roxburgh 18/e p52-54).Post-herpetic neuralgia (PHN):Most common & impoant neurologic complications of herpes zoster.Defined as pain after the rash has healed or pain 1 month or 3 months after rash onset.Best answer would be 4 weeks.