Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) Syndrome and Myocarditis: A Case Report and Literature Review on Fatal Complications of Reactivated Viral Infections.

Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) is a complex and potentially fatal hypersensitivity condition. We present a unique case report and literature review focusing on DRESS syndrome-associated myocarditis resulting from reactivated viral infections in a 21-year-old female. 3 weeks after 5-day oral co-trimoxazole consumption due to acne, she developed symptoms consistent with DRESS syndrome, including a generalized maculopapular rash. Despite prednisolone treatment, the patient developed fatal fulminant myocarditis linked to HHV-6 and CMV reactivation. The patient's death highlights the importance of early recognition and careful management of DRESS syndrome, especially considering the potential viral reactivation that can lead to severe complications. Postmortem investigations revealed that viral reactivation caused myocarditis. Careful consideration must be given to corticosteroid usage in DRESS treatment, as inappropriate prescribing may promote viral reactivation and subsequent complications. While high-dose corticosteroids initiated within the first week effectively suppress HHV-6 reactivation. Conversely, low-dose or late-start high-dose corticosteroids prove ineffective in preventing HHV-6 viremia. Late- onset or low- dose corticosteroids may lead to fatal complications following the primary viral reactivation.