Study offers clarity after one of the diuretics had been perceived as more effective
In a head-to-head comparison of two so-called ‘water pills’ that keep fluid from building up in patients with heart failure, the therapies proved nearly identical in reducing deaths, according to a large study led by Duke Health researchers.
The study compared the diuretics torsemide and furosemide that were prescribed to patients with heart failure starting in the hospital setting. While prior data suggested a potential reduction in deaths among patients taking torsemide, the current study found no such benefit, providing clarity for both doctors and patients.
“Given that the two different therapies provide the same effect on outcomes, we shouldn’t spend time switching patients from one to the other, and instead concentrate on giving the right dose and adjusting other therapies that have been proven to have long-term benefits,” said cardiologist Robert J. Mentz, M.D., chief of the heart failure section in the Division of Cardiology at Duke University School of Medicine and member of the Duke Clinical Research Institute.
Mentz was lead author of the study, called TRANSFORM-HF and funded by the National Heart, Lung and Blood Institute. He presented the findings as a late-breaking clinical trial on Nov. 5 at the American Heart Association’s 2022 Scientific Sessions in Chicago.
The study was designed as a direct comparison of loop diuretics, which are commonly prescribed to reduce the fluid buildup that causes swelling and breathing difficulties in patients with heart failure.
Mentz and colleagues enrolled more than 2,800 patients hospitalized with heart failure. Participants were randomly assigned to receive either torsemide or furosemide, and doctors determined the dosing. The study group was diverse, with women comprising 37% of participants and Black patients comprising 34%.
The main question was whether torsemide reduced patient deaths due to any cause over long-term follow-up (average of more than 17 months). The researchers found that death occurred in 373 of 1,431 study participants (26.1%) in the torsemide group and 374 of 1,428 patients (26.2%) in the furosemide group.
A secondary outcomes analysis looked at deaths or hospitalizations within 12 months, and again found little difference, with death or hospitalization occurring in 677 patients (47.3%) in the torsemide group and 704 patients (49.3%) in the furosemide group.
“This study has immediate clinical applications,” Mentz said. “Doctors spend a lot of time considering whether they will change from one diuretic to another, but there is no difference between the two for outcomes. This provides much-needed clarity. The insights from TRANSFORM-HF add to the evidence base that should help us improve patient care.”
In addition to Mentz, study authors include Kevin J. Anstrom, Eric L. Eisenstein, Shelly Sapp, Stephen J. Greene, Shelby Morgan, Jeffrey M. Testani, Amanda H. Harrington, Vandana Sachdev, Fassil Ketema, Dong-Yun Kim, Patrice Desvigne-Nickens, Bertram Pitt, and Eric J. Velazquez.
The study received support from the NHLBI (U01-HL125478, U01-HL125511, R01HL148354-04, R01HL154768-02).