Phenytoin-induced drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome: a case report from the emergency department.

BACKGROUND: Drug rash with eosinophilia and systemic symptoms (DRESS) syndrome is an uncommon but serious hypersensitivity drug reaction most frequently associated with antiepileptics. Clinical manifestations include rash, fever, and visceral organ involvement, most commonly hepatitis. The mortality rate associated with DRESS syndrome is approximately 10%, the majority due to fulminant liver failure. OBJECTIVES: We report one case of phenytoin-induced DRESS syndrome in a patient who presented to the Emergency Department (ED). Our objectives for this case report include: 1) to learn the importance of DRESS syndrome; 2) to recognize the signs and symptoms of DRESS syndrome; 3) to know what diagnostic studies are indicated; and 4) to learn the appropriate treatment. CASE REPORT: We report one case of phenytoin-induced DRESS syndrome in a 34-year-old man, previously on phenytoin for seizure prophylaxis, who presented to the ED with 5 days of worsening symptoms including generalized rash, fever, tongue swelling, and dysphagia. Laboratory results revealed an eosinophilia and elevated liver enzymes. With initiation of steroids, the transaminitis improved despite increasing eosinophilia and development of an atypical lymphocytosis. Fever and angioedema resolved with improvement of the rash, and the patient was discharged on hospital day 3. CONCLUSION: Given the significant mortality related to DRESS syndrome, ED staff should have a low threshold for suspecting the condition in patients who present with unusual complaints and skin findings after starting any antiepileptic drug. Early diagnosis and prompt treatment with corticosteroids is imperative.

Direct immunofluorescence assay compared to cell culture for the diagnosis of mucocutaneous herpes simplex virus infections in children.

BACKGROUND: Direct immunofluorescence assay (DFA) is commonly used for the rapid identification of herpes simplex virus (HSV) infection in mucocutaneous lesions, yet little is known about its diagnostic accuracy. OBJECTIVE: To determine the diagnostic yield and accuracy of HSV DFA for the diagnosis of mucocutaneous HSV infection in pediatric patients. STUDY DESIGN: Retrospective cross-sectional study of all patients who underwent HSV DFA testing by the Texas Children's Hospital Diagnostic Virology between January 1, 1995 and December 31, 2005. HSV DFA sensitivity, specificity, positive likelihood ratio (LRs), and negative LRs were estimated using viral culture as the reference standard. RESULTS: 659 specimens were submitted for HSV DFA with concurrent viral cultures. Viral cultures were positive for HSV type 1 in 158 (24%) and HSV type 2 in 2 (0.3%). There were 433 different patients with a median age of 8.6 years. Types of lesions were as follows: 50% ulcerative, 26% vesicular, 8% erythema or purpura, 5% pustular, and 11% missing. Of the 659 specimens submitted for HSV DFA, 160 (24%) were inconclusive due to inadequate cells. Of the 499 adequate specimens, overall HSV DFA test accuracy was: sensitivity 61%, specificity 99%, LR positive 40, and LR negative 0.39. CONCLUSIONS: A quarter of specimens submitted for HSV DFA testing are not adequate for DFA testing. When HSV DFA can be performed, it is specific, but not sensitive, for the identification of mucocutaneous HSV infection in children.