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  • ESC 2023 Update:...

ESC 2023 Update: Dapagliflozin fails to improve diuretic efficiency in acute heart failure: DICTATE-AHF trial

Written By : Dr. Kamal Kant Kohli Published On 2023-08-31T08:30:19+05:30  |  Updated On 31 Aug 2023 3:25 PM IST
ESC 2023 Update: Dapagliflozin fails to improve diuretic efficiency in acute heart failure: DICTATE-AHF trial
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USA: Dapagliflozin can be safely started upon hospital admission to rapidly optimise guideline-directed medical therapy (GDMT) among hospitalized patients with acute decompensated heart failure (ADHF) as early dapagliflozin initiation did not worsen any prespecified safety outcomes, a recent study showed.

The researchers revealed that the early initiation of SGLT2 (sodium-glucose co-transporter 2) inhibitor dapagliflozin, however, did not result in a statistically significant improvement in diuretic efficiency relative to structured usual care in these patients. The findings were presented in a Hot Line session at ESC Congress 2023 on August 31, 2023.

Exploratory analyses indicated that dapagliflozin improved decongestion and led to earlier hospital discharge.

The two primary therapeutic goals during acute decompensated heart failure hospitalisation are complete decongestion and optimisation of GDMT. Previous studies of diuretic combinations improved decongestion, but these diuretic combinations inherently did not optimise GDMT and were not associated with improved post-discharge outcomes. Early initiation of dapagliflozin could improve both GDMT optimisation and decongestion, but the efficacy and safety of this strategy are unknown.

The DICTATE-AHF trial examined the efficacy and safety of dapagliflozin initiated within 24 hours of hospital presentation on diuretic response in patients with hypervolaemic ADHF. The study enrolled adult patients with type 2 diabetes and an estimated glomerular filtration rate (eGFR) of at least 30 mL/min/1.73m2 admitted to hospital with ADHF and current or planned treatment with intravenous (IV) loop diuretics. In September 2021, the protocol was amended to allow enrolment of patients with or without type 2 diabetes and to decrease the eGFR inclusion criterion to 25 mL/min/1.73m2 due to new safety data in these groups. The main exclusion criteria were type 1 diabetes, systolic blood pressure less than 90 mmHg, serum glucose less than 80 mg/dL, use of IV inotropic therapy, and history of diabetic ketoacidosis.

Within 24 hours of hospital presentation, patients were randomly assigned in a 1:1 ratio to oral dapagliflozin 10 mg once daily or structured usual care until day 5 or hospital discharge. Natriuretic peptide concentration, standing weight, and congestion were assessed at baseline. A standardised protocol for IV loop diuretic dosing and titration every 12-24 hours was used for both study arms throughout the study period to target a urine output of 3-5 L/day. Loop diuretic doses were titrated to a dose of at least 960 mg/day of IV furosemide equivalents before a thiazide diuretic was added. A spot urine sample was collected after the initial IV loop diuretic dose, but before dapagliflozin administration, to measure baseline diuretic-induced urine sodium, potassium, and creatinine. On day 2, timed, spot urine collections and a 24-hour urine collection were performed. At day 5 or discharge, whichever came first, natriuretic peptide concentration, final standing weight, and a congestion assessment were performed. After hospital discharge, patients were followed to assess 30-day post-discharge outcomes.

The primary outcome was diuretic efficiency (diuretic response) expressed as the cumulative change in weight per cumulative loop diuretic dose (IV and oral) from enrolment to day 5 or discharge, if sooner. The primary outcome was compared across treatment assignments using a proportional odds regression model adjusting for baseline weight. The trial included 240 patients. The average age was 65 years and 39% were women. After adjusting for baseline weight, the odds ratio (OR) for diuretic efficiency with dapagliflozin versus structured care was 0.65, 95% confidence interval (CI) 0.41 to 1.01, p=0.06. In the unadjusted analysis, the OR was 0.64, 95% CI 0.41 to 1.00, p=0.05. The secondary endpoints of in-hospital worsening heart failure and 30-day readmission for heart failure or diabetes-related reasons did not differ between early dapagliflozin initiation compared to usual care.

Regarding exploratory endpoints, dapagliflozin significantly increased both 24-hour natriuresis (p=0.025) and 24-hour urine output (p=0.005), and decreased both time to completing IV diuretic therapy (p=0.006) and time to hospital discharge (p=0.007). Early dapagliflozin initiation was safe across all diabetic and cardiorenal in-hospital outcomes, with no differences between treatment groups in the change in eGFR from baseline to end-of-study, incidence of adverse events, inpatient mortality, symptomatic hypotension, total or serious hypoglycaemia events, genitourinary infections, or severe hypokalaemia.

Study author Professor Zachary Cox of Lipscomb University College of Pharmacy, Nashville, US said: “Although our study did not show statistical significance for its primary endpoint, the totality of data from this trial supports the early initiation of dapagliflozin in ADHF to facilitate decongestion while rapidly and safely optimising GDMT. Our findings of safety across inpatient diabetes, cardiovascular, and renal outcomes should encourage in-hospital use, which can translate to improved chronic SGLT2 inhibitor prescription, adherence, and long-term benefits.”

European Society of Cardiologydapagliflozinacute heart failuretype 2 diabeteshypokalaemia
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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