Dr. Gary Steinberg — MD/PhD and longtime chair of neurosurgery at Stanford, a world expert in the brain's cerebrovascular architecture. He was the San Francisco 49ers neurosurgeon in the 1990s and leads pioneering stem cell trials for chronic stroke recovery.
The gist
Andrew Huberman and Dr. Gary Steinberg break down what strokes, aneurysms, hemorrhages, and TIAs actually are and the lifestyle and genetic factors that raise risk. They cover concussion and traumatic brain injury management, including eye-tracking diagnostics, and debate the risks of contact sports. Steinberg explains modern minimally invasive neurosurgery and his decades of work showing that stem cells, vagus nerve stimulation, and constraint therapy can restore function in patients years after a stroke. They also discuss mild hypothermia for neuroprotection, the dangers of unregulated overseas and domestic stem cell clinics, and the long, expensive road from lab discovery to FDA approval.
Big reveals
- Steinberg recounts collapsing and being resuscitated for a suspected stroke/cardiac arrest that, after a $100,000 workup, turned out to be a faint from overexertion.
- Pushes back on the old dogma that dead brain circuits can't recover, saying they 'can be resurrected.'
- Huberman tells of a stroke patient a resident wanted taken off life support who later recovered meaningful quality of life after a second opinion.
- Reveals injected stem cells don't become neurons as once believed; they work mainly by secreting growth factors and modulating the immune system.
- Warns against overseas and US stem cell clinics, citing patients who developed tumors or went irreversibly blind.
- Reports 17 of 18 patients in his stem cell trial recovered to some extent, some 'almost like a miracle.'
- Says he would not let his own kids play tackle football, and his son skipped a quarterback tryout with his encouragement.
- Discloses he has spent 23 years and over $46 million in grants and philanthropy to bring his stem cell therapy to trial stage.
Things worth remembering
- About 87% of strokes are from clots; roughly 13% are hemorrhagic.
- The brain is only 2% of body weight but draws 15% of blood flow and consumes 20% of the body's oxygen.
- Statins protect blood vessel integrity and may reduce cognitive decline and Alzheimer's risk even without high cholesterol.
- For traumatic brain injury, avoid aspirin (unlike with stroke/TIA) because blood thinners can worsen a contusion.
- Eye-tracking is a highly sensitive concussion test now used for preseason baselines in football and hockey.
- Chiropractic neck manipulation can cause arterial dissection and stroke; Steinberg advises against any adjustment above the shoulders.
- Children who fall into frozen ponds can survive ~30 minutes because deep hypothermia (down to ~20C) shuts down brain metabolism.
- Cooling patients to 32-34C after cardiac arrest improves neurological outcomes and became an American Heart Association standard of care around 2003.
- After a stroke, the opposite (uninjured) side of the brain can increase activity and contribute to recovery.
- Vagus nerve stimulation paired with intensive physical therapy was the first FDA-approved treatment for chronic stroke (2021).