• Kosuke Kawai, Emmanouil Rampakakis, Tsen-Fang Tsai, Hee Jin Cheong, Jittima Dhitavat, Alejandro Ortiz Covarrubias, Lin Yang, Miguel Cashat-Cruz, Homero Monsanto, Kelly Johnson, John S Sampalis, and Camilo J Acosta.
• Global Health Outcomes, Merck & Co., Inc., 770 Sumneytown Pike, West Point, Pennsylvania, PA 19486, USA. Electronic address: kkawai8@gmail.com.
• Int. J. Infect. Dis. 2015 May 1; 34: 126-31.

ObjectivesThe most common complication of herpes zoster (HZ) is postherpetic neuralgia (PHN), a persistent pain that can substantially affect quality of life (QoL). This analysis aimed to evaluate predictors of PHN in HZ patients.MethodsA pooled analysis of prospective cohort studies of HZ patients aged ≥ 50 years from North America (Canada), Latin America (Brazil, Mexico, and Argentina), and Asia (Taiwan, South Korea, and Thailand) was performed. Patients within 14 days of rash onset were included. The incidence of PHN was defined as a worst pain score of ≥ 3, persisting/appearing at >90 days after rash onset. Socio-demographics, HZ disease characteristics, treatment, pain-related interference with activities of daily living, and health-related QoL were assessed.ResultsOf 702 patients with HZ, 148 (21.1%) developed PHN. Similar risks of PHN were observed across geographic regions. On multivariate analysis, older age, greater severity of pain at rash onset, employment status, walking problems at enrollment, and pain interference affecting social relationships were significantly associated with the development of PHN.ConclusionsIn addition to older age and severe acute pain, this study suggests that impaired physical and social functioning from acute zoster pain may play a role in the development of PHN in this prospective cohort study of HZ patients from North and Latin America and Asia.Copyright © 2015. Published by Elsevier Ltd.

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