Ketone Body Improves Neurological Outcomes After Cardiac Arrest By Inhibiting Mitochondrial Fission In Rats

This study investigated whether ketones - specifically β-hydroxybutyrate (β-HB) - could protect the brain after cardiac arrest. Ketones are molecules your body naturally produces when breaking down fat for energy, especially during fasting or on very low-carb diets. While previous research suggested ketones might benefit various brain disorders, scientists wanted to understand if they could help prevent brain damage that commonly occurs after someone's heart stops and is then restarted.

Researchers used rats to model cardiac arrest by temporarily stopping their breathing, then attempted resuscitation. They divided the animals into three groups: healthy controls, cardiac arrest with no treatment, and cardiac arrest treated with ketones given 10 minutes after the heart restarted. Over the following days, they measured brain function, cell death, and examined the mitochondria - the tiny "power plants" inside cells that produce energy.

The results were striking. Rats treated with ketones showed significantly better neurological function, higher survival rates, and less brain cell death compared to untreated animals. The ketones appeared to work by protecting mitochondria from damage and preventing them from breaking apart (a process called "fission") that normally occurs during injury. This preservation of mitochondrial health helped maintain the brain's energy production when it was most vulnerable.

While this research was conducted in animals, it adds to growing evidence that ketones may have powerful neuroprotective properties. For patients interested in metabolic health, this suggests that therapies supporting natural ketone production or ketone supplementation might one day help protect against brain injury. However, clinical trials in humans would be needed before ketone therapy could be recommended for cardiac arrest patients.