A cardiac ultrasound reveals your biological age
Your chronological age is just a number. The heart ages by its own rules. Russian scientists trained a neural network to determine biological heart age from an ordinary ultrasound — echocardiography — with an accuracy of ±5 years. Let's unpack what exactly "ages" and how to measure it.
Biological heart age is a measurable quantity
In one 55-year-old, the heart works like that of a 40-year-old; in another, it already works like a 70-year-old's. The difference is driven by genetics, lifestyle, and accumulated strain — and until recently it was almost impossible to measure. Scientists from the N.I. Pirogov Russian National Research Medical University showed that an ordinary cardiac ultrasound can objectively assess this gap.
A heart's chronological and biological age can diverge by 10–15 years in either direction. Echocardiography makes it possible to measure this gap objectively for the first time.
What echocardiography shows — and why the heart "tells" its age
Echocardiography is an ultrasound examination of the heart. Unlike an ECG, which records only electrical signals, echocardiography provides a full "picture": how the walls move, how the valves open, how blood flows through the chambers of the heart. Some parameters change predictably with age — the heart "ages" along two interrelated scenarios.
- The walls of the heart gradually thicken
- The chambers change shape and volume
- Myocardial hypertrophy appears
- Captured by IVS, LV_PW, RWT
- The myocardium relaxes more slowly
- Ventricular filling worsens
- Diastolic dysfunction develops
- Reflected in E/A and cardiac output
"Echocardiography allows morphological and functional changes of the heart to be assessed simultaneously: wall dimensions, chamber volumes, blood-flow velocities. Some of these measures correlate strongly with age" — and it is on this principle that the model is built.
The study: 303 patients, 48 parameters — and rigorous selection
The work drew on echocardiography data from 303 RGNKTs patients without chronic diseases: aged 23 to 82 years in women and 25 to 72 years in men. All parameters in absolute units (centimeters, liters) were normalized to the patient's height — to eliminate the influence of body build.
An important nuance: the strength of these parameters' correlation with age differs between men and women, though the direction of the association holds for both sexes. So the scientists built two independent models — one for men and one for women — and then combined the best variants into final composite models.
8 echocardiography parameters that "give away" biological age
Six of them are direct echocardiography measures; two (H_RWT and L_E/A) are derived, computed automatically from the primary ones. The final neural-network model includes 5 of the 6 direct parameters (without LV_EDV) and both derived ones.
How the key parameters change with age
All these indicators passed the age-association threshold of |ρ| > 0.55 (a strong Spearman correlation). The specific coefficients are not reported in the primary source — what matters is the direction of change with age.
Why E/A is the most powerful predictor of age
The E/A ratio is the ratio of peak blood-flow velocities in the two phases of diastole (relaxation) of the heart. When you are young, the heart muscle is elastic: the early filling phase (E) is fast and forceful, and the E/A ratio is well above 1. With age the muscle loses elasticity and relaxes worse: the early phase weakens, and the atria have to work harder (the late phase A grows). When E/A falls below 1, that is diastolic dysfunction — one of the early signs of an "aging" heart.
Why the walls thicken with age
The IVS (interventricular septum thickness) and LV_PW (posterior wall) parameters reflect how the myocardium adapts. Under chronic strain — pressure, metabolic changes — the walls gradually thicken. When relative wall thickness (RWT) is ≥ 0.42, one speaks of concentric remodeling or myocardial hypertrophy.
How the neural network works — the FCNN architecture
The scientists built a fully connected neural network (FCNN — Fully Connected Neural Network) with 10 hidden layers on the Keras platform. The data were split into training and test sets.
The model was trained in three modes: the whole sample, men only, and women only. The best results for each sex were combined into a final composite model. This ensemble approach made it possible to squeeze the most out of a relatively small sample (303 people).
Results: accuracy within ±5 years
The final models for men and women showed comparable results. The key quality metrics: MAE (mean absolute error), R² (share of explained variation), and ε-accuracy (the share of predictions within ±10 years of the true age).
R² = 0.77–0.78 means: knowing only the echocardiography parameters, the neural network explains almost 78% of the spread of age in the sample — with no other data about the patient. This is a strong result, given that biological age depends on dozens of factors beyond the state of the heart.
What this means for you in practice
Echocardiography is a standard test that a cardiologist orders for heart complaints, shortness of breath, or high blood pressure. If you already have results, you already have the data to assess your heart's biological age. And while you don't yet have it, it's worth assessing your 10-year cardiovascular risk with the QRISK calculator.
This is the most important parameter. If E/A < 1, that's a signal of impaired diastolic function, typical of an "aged" heart. Discuss with your cardiologist what lies behind it.
RWT ≥ 0.42 means concentric remodeling — hypertrophy of the heart walls. On its own it's not a diagnosis, but it's a reason to keep blood pressure and strain in check.
Regular cardio is one of the few proven ways to improve diastolic function and "rejuvenate" the heart muscle by several years on echocardiography.
The ECG sees electrical activity, echocardiography sees structure and mechanics. Together they give the most complete portrait of your heart's biological age.
Echocardiography is not just a "picture" of the heart
Five parameters — and a neural network will tell you, to within ±5 years, how much younger or older your heart is than your passport. Biological heart age is a measurable — and therefore manageable — indicator.
