How to prevent chronic pain in postherpetic neuralgia.
Post-herpetic neuralgia (PGN) is one of the most common complications of herpes zoster. Chronic pain syndrome (this is another name for post herpetic neuralgia) may last more than 120 days from the onset of the disease. This complication is observed in 50% of patients over the age of 60 who have suffered herpes zoster.
Factors that lead to the transition of chronic pain:
- Older age;
- Female sex;
- Presence of the prodromal period (intoxication, increased sensitivity of the skin, itching or pain before the appearance of pathological elements on the skin);
- Abundant skin rashes;
- Localization of rashes in the area of innervations of the trigeminal nerve (especially in the area of the eyes) or shoulder plexus;
- acute pain;
- Presence of immunodeficiency.
Specialists note that allodynia (pain sensations when exposed to a non-paroxysmal stimulus, such as touch or cold) in the acute period is a poor symptom that increases the risk of post-herpetic neuralgia. The absence of allodynia, on the contrary, is a good prognostic sign.
Chronic pain syndrome
Patients suffering from post-herpetic neuralgia distinguish three types of pain: