Heart Failure with Reduced Ejection Fraction (HFrEF)
This patient has Heart Failure with Reduced Ejection Fraction (HFrEF), defined by a left ventricular ejection fraction of 30%, which falls well below the 40% threshold that distinguishes HFrEF from other heart failure phenotypes 1, 2.
Classification Based on Current Guidelines
The 2022 AHA/ACC/HFSA guidelines and the Universal Definition of Heart Failure establish clear LVEF-based categories 1, 2:
- HFrEF: LVEF ≤40% (your patient at 30%)
- HFmrEF: LVEF 41-49%
- HFpEF: LVEF ≥50%
Your patient's clinical presentation fully supports this diagnosis:
- LVEF of 30% clearly places them in the HFrEF category
- Markedly elevated NT-proBNP correlates strongly with reduced ejection fraction 3
- CXR findings (mild CHF with bilateral pleural effusions) demonstrate objective evidence of congestion
- Clinical syndrome meets diagnostic criteria with both structural abnormality (reduced EF) and congestion (effusions)
Supporting Evidence for the Diagnosis
The NT-proBNP elevation is particularly significant in HFrEF. Recent data shows that HFrEF patients have the highest median NT-proBNP levels (4,020 pg/mL) compared to HFmrEF (2,350 pg/mL) and HFpEF (1,780 pg/mL), with a strong negative correlation between NT-proBNP and LVEF (r = -0.61 in HFrEF patients) 3. This means your patient's markedly elevated NT-proBNP is entirely consistent with their severely reduced ejection fraction.
The bilateral pleural effusions on chest X-ray represent objective evidence of systemic congestion, which combined with elevated natriuretic peptides, fulfills the universal definition criteria for symptomatic heart failure 2.
Clinical Implications
This HFrEF classification has critical therapeutic implications, as this phenotype has the most robust evidence base for guideline-directed medical therapy including:
- ACE inhibitors/ARBs/ARNI
- Beta-blockers
- Mineralocorticoid receptor antagonists
- SGLT2 inhibitors
These therapies have proven mortality and morbidity benefits specifically in HFrEF 1, 4.
Common Pitfall to Avoid
Do not confuse the presence of pleural effusions with HFpEF. While serum NT-proBNP has good diagnostic accuracy for CHF-related pleural effusions 5, the ejection fraction remains the primary determinant of heart failure classification. The effusions here are a manifestation of decompensated HFrEF, not an indicator of preserved systolic function 1.