Heart Failure Life Expectancy Calculator

Introduction

For patients with heart failure, understanding prognosis is crucial for making informed decisions about advanced therapies, lifestyle adjustments, and care planning. The Heart Failure Life Expectancy Calculator provides an estimate of survival using a simplified implementation of the Seattle Heart Failure Model (SHFM). By entering key clinical variables such as age, ejection fraction, NYHA class, blood pressure, lab values, and medication use, you can obtain 1-year, 2-year, and 5-year survival estimates along with median life expectancy. This tool is intended for educational purposes and should complement, not replace, clinical judgment. All calculations run in your browser, ensuring patient privacy.

How to Use the Heart Failure Life Expectancy Calculator

1. Enter the patient’s age and select sex.

2. Input ejection fraction (LVEF) and select NYHA class.

3. Provide systolic blood pressure and weight.

4. Indicate if the etiology is ischemic.

5. Enter laboratory values: hemoglobin, sodium, cholesterol, uric acid, lymphocyte percentage, and diuretic dose.

6. Select medications: ACE inhibitor/ARB, beta-blocker, statin, and aldosterone blocker.

7. Indicate device use: ICD and CRT.

8. Click Calculate to view survival estimates.

How the Heart Failure Life Expectancy Calculator Formula Works

The calculator uses a simplified scoring system derived from the Seattle Heart Failure Model variables. Each variable contributes a weighted point value to a total score, which is then transformed into survival probabilities. This is an educational approximation, not the exact SHFM.

Formula:
Score = Σ (weighted factors)
Survival = baseline survival × exp(-score × 0.8)

Where baseline 1-year survival is 95%, 2-year is 88%, 5-year is 70%, and median life expectancy is 8 years. The score adjusts these baselines up or down. The model includes age, sex, NYHA class, ejection fraction, systolic BP, ischemic etiology, weight, diuretic dose, hemoglobin, lymphocyte %, uric acid, sodium, cholesterol, and protective effects of ACE inhibitors, beta-blockers, statins, aldosterone blockers, ICD, and CRT.

Worked Example

Consider a 65-year-old male with heart failure:

• Ejection fraction: 30%

• NYHA class: III

• Systolic BP: 110 mmHg

• Weight: 75 kg

• Ischemic etiology: No

• Hemoglobin: 13.5 g/dL

• Sodium: 138 mEq/L

• Cholesterol: 180 mg/dL

• Uric acid: 7.0 mg/dL

• Lymphocyte: 25%

• Diuretic dose: 40 mg/day

• Medications: ACE inhibitor, beta-blocker, statin

• Devices: None

Step 1 – Calculate the simplified score. Using the weights in the calculator, the score is approximately 0.45.
Step 2 – Convert to survival. Using the exponential factor, 1-year survival is about 89%, 2-year 82%, 5-year 65%, and median life expectancy 7.2 years.
Step 3 – Interpret. The patient falls into the moderate risk category. The recommendation is to optimize medical therapy and consider referral to an advanced heart failure specialist if symptoms persist.