Dapagliflozin Evaluation to Improve the Lives of Patients With Preserved Ejection Fraction Heart Failure - DELIVER
Contribution To Literature:
Highlighted text has been updated as of November 3, 2022.
The DELIVER trial showed that dapagliflozin is superior to placebo in improving HF outcomes among patients with symptomatic stable mildly reduced or preserved LVEF (EF >40%), irrespective of diabetes status.
The goal of the trial was to assess the safety and efficacy of dapagliflozin in patients with left ventricular ejection fraction (LVEF) >40%, irrespective of diabetes status.
Patients were randomized in a 1:1 fashion to either dapagliflozin 10 mg (n = 3,131) or matching placebo (n = 3,132). All the patients were receiving appropriate treatments for heart failure (HF).
- Total screened: 10,418
- Total number of enrollees: 6,263
- Duration of follow-up: 2.3 years (median)
- Mean patient age: 71.7 years
- Percentage female: 44%
- Age ≥40 years
- Evidence of structural heart disease
- EF >40%
- Elevated B-type natriuretic peptide (BNP)
Other salient features/characteristics:
- White 71%
- North America: 14%, Asia: 19%, Latin America: 19%
- New York Heart Association functional class II: 75%
- Mean LVEF 54% (≤49%: 34%; 50-59%: 36%)
- Type 2 diabetes mellitus (DM2): 45%
- Estimated glomerular filtration rate: 61 ml/min/1.73 m2
The primary outcome, cardiovascular death or worsening HF for dapagliflozin vs. placebo, was: 16.4% vs. 19.5% (hazard ratio [HR] 0.82, 95% confidence interval [CI] 0.73-0.92, p < 0.001).
- Cardiovascular death: 7.4% vs. 8.3% (HR 0.88, 95% CI 0.74-1.05)
- HF hospitalization or urgent visit for HF: 11.8% vs. 14.5% (HR 0.79, 95% CI 0.69-0.91)
For the primary outcome, benefit was similar among patients with or without DM2, and for categories of baseline EF (≤49%, 50-59%, ≥60%).
- All-cause mortality: 15.9% vs. 16.8% (HR 0.94, 95% CI 0.83-1.07, p > 0.05)
- Any amputation: 0.6% vs. 0.8%
- Any major hypoglycemic event: 0.2% vs. 0.2%
Impact of frailty: Frailty was measured using the Rockwood cumulative deficit approach. On this scale, 37.6% had class 1 frailty (not frail); 38.6% had mild-moderate frailty, and 23.8% had severe frailty. The effect of dapagliflozin on the primary endpoint from Frailty Index class 1 to 3 was: 0.85 (95% CI 0.68-1.06); 0.89 (0.74-1.08); and 0.74 (0.61-0.91), respectively (p for interaction = 0.40). Although frailer patients had worse Kansas City Cardiomyopathy Questionnaire (KCCQ) scores at baseline, the improvement with dapagliflozin was greater than in less frail patients (p for interaction = 0.021).
Impact of body mass index (BMI): Mean BMI was 29.8 kg/m2. Compared with placebo, dapagliflozin reduced the risk of the primary outcome to a similar extent across BMI categories (p for interaction = 0.82). The placebo-corrected change in weight at 12 months for BMI categories was: 18.5-24.9 kg/m2: –0.88; 25-29.9 kg/m2: –0.65; 30-34.9 kg/m2: –1.42; 35.0-39.9 kg/m2: –1.17; ≥40 kg/m2: –2.50 (p for interaction = 0.002). The placebo-corrected change in KCCQ-total symptom score with dapagliflozin at 8 months for the respective BMI categories was: 0.9 vs. 2.5 vs. 1.9 vs. 2.7 vs. 8.6 points (p interaction = 0.03).
Lifetime benefit modeling: Nonparametric age-based methods were used to extrapolate potential gains in survival free from the primary endpoint from long-term use of dapagliflozin. At age 55 years, the estimated survival free from the primary endpoint was 11.8 years with dapagliflozin vs. 9.8 years with placebo (p = 0.14). At age 65 years, the estimated event-free survival was 12.1 years with dapagliflozin and 9.7 years with placebo (p = 0.002). At age 75 years, the estimated event-free survival was 10.6 years with dapagliflozin and 9.4 years with placebo (p = 0.063).
The results of this trial indicate that dapagliflozin is superior to placebo in improving HF outcomes among patients with symptomatic stable mildly reduced or preserved LVEF (EF >40%), irrespective of diabetes status. Benefit is primarily driven by a reduction in HF hospitalizations, not mortality. The benefit of dapagliflozin was consistent across the range of frailty and BMI categories studied. The improvement in health-related quality of life with dapagliflozin occurred early and was greater among patients with greater frailty and higher BMI. Absolute gains in event-free survival appeared to be meaningful, although statistically significant only among the subgroup of patients aged 65 years at randomization. This is helpful since many HF trials have a short span of follow-up (1-3 years).
Even though the sodium–glucose cotransporter 2 (SGLT2) inhibitors were introduced as DM2 management drugs, results of EMPA-REG OUTCOME, EMPEROR-Reduced, DAPA-HF, SCORED, SOLOIST, and other trials indicated a clear benefit in HF management. Similar to EMPEROR-Preserved, this trial enrolled patients with near normal or normal EFs, and shows a benefit in this patient population, irrespective of diabetes status. The recent American Heart Association/American College of Cardiology/Heart Failure Society of America HF guidelines designate SGLT2 inhibitor use in patients with HF with preserved EF (HFpEF) a Class IIA, Level B recommendation. In the current trial, an attenuation of benefit among patients with EF >60% was not observed, as was noted in EMPEROR-Preserved, although they are both subgroup analyses. Most routinely used drugs for HF with reduced EF (HFrEF) have not shown to be effective among patients with HFpEF, and some drugs such as candesartan, spironolactone, and sacubitril/valsartan appear to mostly have a benefit among patients with EF between 40-49% rather than true HFpEF. The exact mechanism of benefit is unclear.
Adamson C, Kondo T, Jhund PS, et al. Dapagliflozin for heart failure according to body mass index: the DELIVER trial. Eur Heart J 2022;43:4406-17.
Solomon SD, McMurray JJV, Claggett B, et al., on behalf of the DELIVER Trial Committees and Investigators. Dapagliflozin in Heart Failure With Mildly Reduced or Preserved Ejection Fraction. N Engl J Med 2022;387:1089-98.
Butt JH, Jhund PS, Belohlávek J, et al. Efficacy and Safety of Dapagliflozin According to Frailty in Patients With Heart Failure: A Prespecified Analysis of the DELIVER Trial. Circulation 2022;146:1210-24.
Presented by Dr. Scott Solomon at the European Society of Cardiology Congress (ESC 2022), Barcelona, Spain, August 27, 2022.
Keywords: ESC22, ESC Congress, Amputation, Diabetes Mellitus, Diabetes Mellitus, Type 2, Frail Elderly, Geriatrics, Heart Failure, Hypoglycemia, Metabolic Syndrome, Natriuretic Peptide, Brain, Quality of Life, Secondary Prevention, Sodium-Glucose Transporter 2 Inhibitors, Stroke Volume
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