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Scientists did not solve a mystery in Leonardo da Vinci’s drawings. A 2020 study instead used modern heart scans and genetic data to investigate the branching muscle structures Leonardo described in 1513—and found evidence that their shape is related to how the heart pumps and to heart-failure risk.
What are the heart structures in Leonardo’s drawings?
They are myocardial trabeculae: branching strands of muscle that line the inner surfaces of the heart’s ventricles. The ventricles are the chambers that pump blood out of the heart. The 2020 Nature study notes that Leonardo da Vinci first described these structures in 1513.
That historical connection is real, but it is narrower than the headline suggests. The researchers did not analyze Leonardo’s drawings or investigate what he intended to explain. They studied how trabecular structure varies in living people and how that variation relates to heart function and disease.
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In “Genetic and functional insights into the fractal structure of the heart,” the study authors combined heart imaging, genetic analysis, observational data and computer simulations. They described trabecular morphology as an important determinant of cardiac performance. In their UK Biobank analyses, greater trabecular complexity was associated with higher stroke volume, stroke work and cardiac index—measures related to the amount of blood the heart pumps and the work it performs.
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The authors also reported evidence from Mendelian randomization that reduced trabecular complexity was causally associated with heart-failure risk. That is a finding from a population-level research analysis, not proof that a person’s trabecular pattern predicts whether they will develop heart failure. It does not establish a screening test or a treatment.
How did the researchers measure and test trabecular complexity?
The study used fractal dimension, an image-derived measure of branching complexity, calculated from cardiac MRI images. The different methods addressed different parts of the question; none was an individual clinical test.
- MRI and fractal analysis: quantified the branching pattern visible in heart images.
- Human observational data: examined how measured morphology related to measures of cardiac performance.
- Genetic association: identified genetic loci linked to trabecular complexity.
- Mendelian randomization: estimated whether the relationship with heart-failure risk could be causal, subject to the method’s assumptions.
- Biomechanical simulation: modeled heart mechanics and produced results consistent with the human observations.
How large was the study?
The Nature paper’s discovery analysis used cardiac MRI data from 18,096 unrelated UK Biobank participants and identified 16 significant genetic loci. The researchers also assessed replication and disease associations using additional samples and genetic datasets:
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors| Analysis | Sample or dataset |
|---|---|
| UK Biobank replication cohort | 6,536 participants |
| UK Digital Heart Study replication cohort | 1,129 healthy adults |
| Dilated cardiomyopathy analysis | 510 patients |
| Heart-failure summary genetic data | 47,309 cases and 930,014 controls across 26 studies |
These figures describe the samples used, not proof that the findings apply equally to every population. The discovery group was described as a well-mixed population of European ethnicity.
Did scientists really solve a 500-year-old mystery?
Not in the historical sense implied by that phrase. The paper’s introduction credits Leonardo with describing trabeculae in 1513, but its research question was about adult heart function, genetic architecture and disease association. It neither tested Leonardo’s observations nor established that he had posed a mystery the modern study resolved.
The headline also gives the Nature paper an incorrect title. The study is called “Genetic and functional insights into the fractal structure of the heart,” not “The role of myocardial trabeculae in cardiac function and disease.” The more accurate takeaway is that researchers found evidence linking the complexity of these heart-muscle structures to cardiac performance and heart-failure risk.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the findings mean for patients
The study advances understanding of heart structure and function, but it does not give patients a new diagnosis, screening recommendation or treatment. Its results concern relationships identified across research cohorts and analyses; they do not tell an individual what their MRI means or what care they should receive.
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