The optimal combination drug therapy for treatment of hypertension is not established, although current U.S. guidelines recommend inclusion of a diuretic. This double-blind trial, in which high-risk patients with hypertension were randomly assigned to treatment with benazepril plus either amlodipine or hydrochlorothiazide, showed that benazepril plus amlodipine was superior to benazepril plus hydrochlorothiazide in reducing cardiovascular events in this population.

Patients with chronic hepatitis C who did not have a sustained viral response to peginterferon and ribavirin were randomly assigned to receive low-dose peginterferon or no treatment for 3.5 years. The clinical and histologic outcomes were not better in patients treated with peginterferon. These findings do not support the use of long-term peginterferon in patients who do not have a sustained virologic response to initial therapy.

In this randomized comparison of treatment with tenofovir disoproxil fumarate or adefovir dipivoxil for 48 weeks in patients with chronic hepatitis B, tenofovir was more likely to result in viral suppression. The follow-up period was not long enough to assess the resistance patterns, risks, and benefits of long-term treatment.

In a multicenter trial, 4128 patients who had heart failure with a preserved ejection fraction were randomly assigned to receive irbesartan or placebo and were followed for a mean of 49.5 months. There were no significant differences between the two study groups in the rate of the primary outcome (death or hospitalization for heart failure).