Abstract:ObjectiveChronic hepatitis B(CHB)patients with lamivudine treatment duration and relationship of HBV YMDD.Methods254 patients with lamivudine treatment inpatients with CHB is divided into different time<24 weeks、24~48 weeks、49~96weeks and >96 week a total of four groups,Using fluorescence PCR method for detection of serum levels of HBV DNA and HBV YMDD mutation.ResultsThere is a correlation between the positive rate of lamivudine treatment duration and serum HBV DNA,with the extension of lamivudine treatment duration,the positive rate of serum HBV DNA increased gradually.HBV YMDD gene mutation of lamivudine treatment durationis related tothe HBV DNA positive rate of patients,with the extension of lamivudine treatment duration,HBV YMDD gene mutation of HBV DNA positive rate of patients is increasing,and Lamivudine treatment duration>HBV YMDD mutation rate after 24 weeks significantly increased.ConclusionCHB lamivudine therapy for a long time may cause HBV YMDD mutation,causingpatients’resistance.
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