Diagnosing HFpEF: A Structured Algorithmic Approach
Diagnose HFpEF using a 4-step sequential process: (1) identify symptoms/signs with risk factors and measure natriuretic peptides, (2) obtain echocardiography showing EF ≥50% with structural/functional abnormalities, (3) apply diagnostic scoring if uncertain, and (4) perform exercise testing or invasive hemodynamics when diagnosis remains unclear.
Step 1: Clinical Assessment and Natriuretic Peptide Measurement
Begin by identifying the cardinal symptom of exertional dyspnea in patients with typical risk factors: obesity, hypertension, diabetes, age >60 years, and atrial fibrillation 1, 2. Look specifically for:
Major criteria: orthopnea, jugular venous distension, hepatojugular reflux, pulmonary rales, S3 gallop, acute pulmonary edema, cardiomegaly 1
Minor criteria: dyspnea on exertion, nocturnal cough, ankle edema, tachycardia >120 bpm, hepatomegaly, pleural effusion 1
Measure natriuretic peptides immediately - this is mandatory for diagnosis 1, 2:
- Ambulatory patients: BNP >35 pg/mL or NT-proBNP >125 pg/mL
- Hospitalized patients: BNP >100 pg/mL or NT-proBNP >300 pg/mL
Critical pitfall: Normal natriuretic peptides do NOT exclude HFpEF, especially in obese patients where levels are artificially suppressed 3, 4. Higher BMI is prevalent in HFpEF and lowers natriuretic peptide levels relative to the actual left ventricular filling pressure 1.
Step 2: Echocardiographic Confirmation
Obtain transthoracic echocardiography to confirm EF ≥50% and identify structural/functional cardiac abnormalities 2. The diagnosis requires evidence of increased LV filling pressures through:
Key echocardiographic parameters 2, 3:
- E/e' ratio (≥15 is diagnostic; >9 supports diagnosis)
- Left atrial volume index (enlarged)
- LV mass index (increased)
- Tricuspid regurgitation velocity (>35 mm Hg PA systolic pressure)
- LV global longitudinal strain (reduced)
- Mitral annular early diastolic velocity (e' reduced)
Step 3: Apply Diagnostic Scoring for Intermediate Cases
When diagnosis remains uncertain after Steps 1-2, use the H2FPEF score 2:
H2FPEF scoring system (0-9 points total):
- Heavy (obesity/BMI >30): 2 points
- Hypertension (≥2 antihypertensive medications): 1 point
- Fibrillation (atrial): 3 points
- Pulmonary hypertension (echo PA systolic pressure >35 mm Hg): 1 point
- Elderly (age >60 years): 1 point
- Filling pressure (E/e' >9): 1 point
Score interpretation: Higher scores double the odds of HFpEF with each point increment 2.
Alternatively, the HFA-PEFF algorithm provides a more comprehensive approach 3:
- Score ≥5 points: Definite HFpEF
- Score 2-4 points: Intermediate probability - proceed to Step 4
- Score ≤1 point: HFpEF unlikely
Step 4: Functional Testing for Diagnostic Uncertainty
When scores are intermediate or diagnosis remains unclear, perform exercise stress testing 2, 3, 4:
Exercise echocardiography: Assess diastolic parameters during exertion to unmask elevated filling pressures that may be normal at rest 2
Invasive hemodynamic exercise testing: This is the gold standard when noninvasive testing is inconclusive 2, 4. Measure:
- Pulmonary capillary wedge pressure or LV end-diastolic pressure
- Pulmonary artery pressures
- Stroke volume and cardiac output
Important caveat: A substantial proportion of patients with negative or indeterminate noninvasive tests still meet invasive hemodynamic criteria for HFpEF, particularly in obesity and atrial fibrillation 4, 5.
Excluding Cardiac and Non-Cardiac Mimics
Throughout this process, actively exclude alternative diagnoses 1:
- Pulmonary causes: COPD, interstitial lung disease, pulmonary hypertension
- Cardiac mimics: Significant valvular disease, ischemia, pericardial disease
- Other: Anemia, deconditioning, obesity hypoventilation
The Universal Definition of HF requires that symptoms/signs are caused by structural/functional cardiac abnormalities - not merely their presence alongside other conditions 1.
Key Diagnostic Principles
The diagnosis is often missed in primary care because symptoms are nonspecific and traditional signs of congestion may be absent at rest 6, 5. Maintain high clinical suspicion in patients with unexplained exertional dyspnea and multiple cardiometabolic comorbidities.
Obesity and atrial fibrillation are particularly challenging populations where HFpEF is frequently underdiagnosed 4, 5. In these patients, lower thresholds for advanced testing are warranted.
Cardiology referral is indicated when diagnosis remains uncertain after initial evaluation, when specialized testing is needed, or when optimizing guideline-directed medical therapy 1.