Which EF phenotype is associated with the best prognosis among the primary phenotypes?

• A. HFpEF generally has a better prognosis than HFrEF; HFrEF has the worst prognosis among the primary phenotypes
• B. HFrEF generally has the best prognosis among the primary phenotypes
• C. HFmrEF has the best prognosis and HFpEF the worst
• D. Prognosis is the same across phenotypes

Answer: (A)

The main concept here is how prognosis differs across heart failure phenotypes defined by ejection fraction. Reduced ejection fraction reflects weaker heart muscle and systolic dysfunction, which generally leads to higher mortality and more rehospitalizations, making outcomes worse. In contrast, preserved ejection fraction involves diastolic dysfunction with preserved contractile function; patients tend to have a somewhat better survival profile, although they still face serious health risks and frequent hospital visits due to comorbidities. Those with mid-range ejection fraction typically show an intermediate prognosis, not as favorable as preserved EF but not always as dire as reduced EF. Therefore, HFpEF tends to have the best prognosis among the primary phenotypes, while HFrEF has the worst, with HFmrEF in between.