Tuesday, 9 August 2016

Risk Factors and Complications of Herpes Zoster


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               http://www.mathewsopenaccess.com/PDF/Dermatology/M_J_Derma_1_1_006.pdf

Herpes zoster is a viral infection that is prevalent among 20-30% of people. Though it is unclear, the underlying pathophysiology can be attributed to cellular immunity dysfunction. Potential risk factors may involve routine procedures like biopsies and teeth extraction. Herpes zoster usually follows a very benign course that is most commonly complicated with post herpetic neuralgia; however, serious systemic complications including heart block and cerebral angiitis are frequently reported in immunocompromised cases. This article reviews publications on this topic and aims to highlight the potential risk factors and documented complications.

Herpes zoster is a reactivation of varicella-zoster virus, a member of the Herpesviridae that remains dormant within the dorsal root or cerebral nerve ganglion after a primary varicella infection. (Herpes) and (Zoster) are Greek words mean Creeping Girdle. This article aims to review publications on herpes zoster, with a special focus on potential risk factors and reported complications.

Herpes zoster typically presents as a vesicular eruption proceeded by pain, erythema, local edema or abnormal sensation. Pain might be burning, shooting, stapping, itching or aching. It usually follows a ganglion distribution, typically on the thoracic region; however, immunocompromised patients might have disseminated herpes zoster. Young patients usually present with an erythematous form, whereas elderly or ill patients present with hemorrhagic or necrotic forms. EPIDEMIOLOGY Herpes zoster is incident among one million, or 4 per 1000 population, per year in the United States and twenty to thirty percent of people will get herpes zoster in their life. It dominates in old age; and rarely, it reactivates during infancy with primary foetal/early infantile infection or during childhood. It is still controversial whether it has a sporadic reactivation or it is a seasonal disease. RISK FACTORS Exact risk factors of reactivation are not well-known; yet, cellular immunity is thought to have a key role. 

This role is well illustrated in old age due to normal age-related decline in cellular immunity; Plasmodium/malaria infection due to transient depression of cellular immunity and immune suppression in cases of immune deficiencies, human immunodeficiency infection or HIV disease and immunosuppressants. The role of genetics and family history is still controversial.

Risk of rheumatoid and connective tissue diseases is debateable. It is difficult to attribute the risk of reactivation to the disease per sae; especially that patients are frequently on immunosuppressant medications. Some publications suggest luck of association between herpes zoster and the disease and/or the medication, whereas other researchers propose a possible relationship. Other co-existing diseases are diabetes mellitus, essential hypertension, dyslipidaemia, chronic venous diseases, other skin diseases, and malignancies including breast cancer, lung cancer, prostate cancer, lymphoma, lymphatic leukaemia, multiple myeloma and Hodgkin’s disease with bone marrow transplant. COMPLICATIONS Though it usually follows a benign course, herpes zoster is most commonly complicated by post herpetic neuralgia. It is proposed that different organopathies are due to either direct infiltration of the virus or indirect hematogenous infection.

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