title: Lymphocyte stimulation test with tetrazolium-based colorimetric assay for diagnosis of drug-induced allergic hepatitis.
abstract: The lymphocyte stimulation test (LST) is useful for diagnosing drug-induced allergy and identifying the causative drug. In this study, we examined the usefulness of 3-(4,5-dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) as a marker for LST in diagnosing drug allergy. In a basic study using normal peripheral blood mononuclear cells, the normal range of stimulation index (SI) was 0.92-1.38, and the mean SI for all drugs tested was 1.134 +/- 0.111 (mean +/- S.D.). The cut-off value of SI for diagnosis of drug allergy was thus set at over mean + 2S.D. for possibly positive, and at over mean + 3S.D. as a definitely positive reaction. Forty-six cases of suspected drug-induced allergic hepatitis involving 85 drugs were diagnosed by this assay, and the possibly positive and definitely positive rates were 54.3% (SI > or = 1.4) and 41.3% (SI > or = 1.5), respectively. A clinical study was made of 113 patients with diagnosed drug-induced allergic hepatitis. Forty-nine (43%) of the patients were male and 64 (57%) were female. In 85% of cases the allergic reaction occurred within one month of taking medication, but there were a number of cases in whom onset occurred after long-term incubation. The main clinical symptoms were jaundice, itching, eruption, fever, and general malaise. In about 75% of cases glutamic oxaloacetic transaminase (GOT) or glutamic pyruvic transaminase (GPT) returned to normal range within one month after medication was halted.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Pharmaceutical Division, Ogaki Municipal Hospital, Gifu, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yoshimura
authors.forename: C
authors.initials: C
authors.lastname: Kurita
authors.forename: F
authors.initials: F
authors.lastname: Yamazaki
authors.forename: S
authors.initials: S
authors.lastname: Nakano
authors.forename: H
authors.initials: H
authors.lastname: Nagai
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000410:Alanine Transaminase / Q000097:blood; D001219:Aspartate Aminotransferases / Q000097:blood; D056486:Chemical and Drug Induced Liver Injury / Q000175:diagnosis*; D002648:Child; D002675:Child, Preschool; D003124:Colorimetry; D004342:Drug Hypersensitivity / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D013778:Tetrazolium Salts; D013844:Thiazoles
chemical_list: D013778:Tetrazolium Salts; D013844:Thiazoles; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; C022616:thiazolyl blue