Health Rounds: AI Enhances Common Heart Test

AI Revolutionizes Heart Disease Screening

Artificial intelligence (AI) is making a significant impact in the medical field, particularly in detecting structural heart problems. A recent study published in Nature highlights how AI can transform a standard doctor’s office test into a powerful screening tool for identifying heart issues. Researchers have developed an AI tool called EchoNext that analyzes electrocardiogram (ECG) data to determine which patients need further evaluation through echocardiograms.

An echocardiogram is a noninvasive ultrasound exam used to check for valve diseases, thickening of the heart muscle, and other structural defects that can affect heart function. The EchoNext tool leverages ECG data, which is more affordable than echocardiograms, to identify individuals who may require additional testing. This approach could potentially reduce costs and improve early detection of heart conditions.

According to Pierre Elias, the study leader from Columbia University Vagelos College of Physicians and Surgeons, traditional medical education taught that structural heart disease cannot be detected through ECGs alone. However, with the integration of AI, this paradigm is changing.

In a trial involving 13 cardiologists reviewing 3,200 ECGs, the accuracy rate for detecting structural heart problems was approximately 64%. In contrast, EchoNext achieved an accuracy rate of 77%, demonstrating its potential as a reliable screening method.

The researchers then tested EchoNext on ECGs from nearly 85,000 patients. Based on these results, doctors had referred 4,100 patients for echocardiograms, which identified structural problems in about 3,000. However, EchoNext identified an additional 3,400 patients who were at high risk and needed further evaluation.

This suggests that many patients might have had undiagnosed structural heart disease due to the lack of AI tools during their initial ECGs. Elias emphasized the importance of early detection, stating that “you can’t treat the patient you don’t know about.” He believes that using EchoNext could turn the estimated 400 million ECGs performed globally each year into opportunities for screening and potentially life-saving treatment.

Structural heart disease affects millions worldwide, with 64 million people suffering from heart failure and 75 million with valvular disease. In the U.S., the annual cost exceeds $100 billion, highlighting the urgent need for effective screening methods.

New Discoveries in Brain Energy Metabolism

In another groundbreaking study, researchers have uncovered that some brain cells have “backup batteries” that help maintain brain function during periods of metabolic stress. Neurons, the nerve cells responsible for transmitting information, are equipped with glycogen stores that act as an emergency energy source when needed.

Traditionally, it was believed that glial cells served as energy warehouses for neurons, storing glycogen and supplying it as fuel. However, new research led by Milind Singh from Yale School of Medicine reveals that neurons themselves store glycogen and can break it down when necessary.

“This discovery is like finding out your car is a hybrid — it’s not just reliant on gas stations, it’s been carrying an emergency battery all along,” Singh said.

The findings were made using experiments with C. elegans, a microscopic roundworm, and a fluorescent sensor that glows when cells break down sugar for energy. These insights could lead to new treatments for neurological conditions where energy failure is a factor, such as stroke, neurodegeneration, and epilepsy.

The research team found that neuron-specific glycogen-dependent energy production is crucial when mitochondria, the primary energy factories of cells, are impaired. Under conditions of limited oxygen supply, glycogen serves as a rapid-access fuel source, allowing neurons to stay active when other systems might fail.

Daniel Colón-Ramos, a senior researcher at Yale, noted that this flexibility is essential for maintaining brain function and responding to stress. “This research reshapes our understanding of brain energy metabolism and opens new avenues for exploring how to protect and support neuronal function in disease,” he said.

These discoveries highlight the complexity of brain function and the potential for new therapeutic approaches in treating neurological disorders. As scientists continue to explore the intricacies of brain metabolism, they are uncovering new ways to enhance brain health and resilience.