Impact of postherpetic neuralgia: A six year population-based analysis on people aged 50 years or older.

OBJECTIVES:To estimate the incidence and burden of postherpetic neuralgia (PHN) and to investigate risk factors for PHN in the Valencia Region of Spain. METHODS:Data were extracted from population and healthcare databases from the Valencia Region (2009-2014). Herpes zoster (HZ) and PHN were defined using ICD-9 codes and drug prescriptions in people aged ≥50 years. The risk of HZ patients for developing PHN and potential risk factors (diabetes mellitus, COPD and heart failure) were investigated. A survival analysis was developed to estimate the cumulative hazard of developing HZ and PHN between ages 50-90 years. RESULTS:From a total of 2,289,485 subjects, 87,086 cases of HZ were registered, 13,658 (15.7%) of whom developed PHN. PHN risk was higher in women and increased sharply with age and comorbidities as diabetes mellitus, COPD and heart failure. The cumulative risk of developing HZ between ages 50-90 years was 31.7% (95% CI: 31.3-32.1) and 6.9 (95% CI: 6.7-7.1) for PHN. CONCLUSIONS:PHN risk was higher in women and increased with age and comorbidities. At least 32% and 7% of people will develop HZ and PHN, respectively, between ages 50-90 years. These results should be considered for vaccine policy implementation.