Drug-induced autoimmune like hepatitis: Current concepts
Raised IgG is a useful marker to identify drug-induced autoimmune hepatitis (DIAIH) from drug-induced liver injury (DILI).
On liver biopsy, portal CD20+ mature B cells and plasma cells favor AIH.
The long-term outcomes of DILI were examined in a study from Sweden of 712 patients who survived DILI. Data of 685 patients could be linked to Swedish national Registries. 23 had been hospitalized for liver disease. At the last follow-up, 16 were alive and 7 had died. On FU, 8 patients developed cirrhosis, which may have been due to DILI; autoimmune hepatitis developed in 5 of these 23 patients after ~6 years (J Hepatol 2009;50:511-517).
Many patients with AIH have drug-induced AIH. In a study from Iceland, 24 cases of DIAIH were identifi ed (Hepatology. 2010;51:2040-8). The two main drugs implicated were nitrofurantoin in 11 patients and minocycline in 11 patients.
DIAIH patients had positive antinuclear antibodies 83% vs 70%) and smooth muscle antibodies (50% vs 45%) vs AIH patients.
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