What lifestyle factors increase the risk of stroke and hemorrhage?

Smoking, high LDL cholesterol (bad cholesterol), and hypertension are significant risk factors. Excessive alcohol intake, cocaine, and methamphetamines also damage blood vessels and increase the risk of aneurysms and hemorrhage by elevating blood pressure and impairing vessel integrity.

What is a Transient Ischemic Attack (TIA) and its symptoms?

A TIA, or 'mini-stroke,' is a reversible stroke resulting in temporary neurological function loss due to reduced blood flow, lasting minutes to under 24 hours. Symptoms can include temporary partial paralysis, inability to speak, visual problems, slurred speech, or cognitive difficulties, depending on the affected brain area.

Is it safe to get a neck adjustment from a chiropractor?

Dr. Steinberg recommends against neck manipulation by chiropractors due to the rare but devastating risk of arterial dissection. This can cause a tear in the artery wall, leading to a false passage of blood that obstructs flow or forms a clot, potentially resulting in a stroke.

Should children play tackle football or rugby given the risks of concussion?

Dr. Steinberg personally would not let his children play tackle football or rugby due to concussion risks. While team sports offer benefits, the accumulating evidence suggests that tackle football and even repeated heading in soccer can lead to chronic traumatic encephalopathy (CTE) and long-term injury.

How severe does a head hit need to be before one should worry about brain damage?

In most everyday incidents, such as bumping one's head and feeling dizzy for a day or two, there's generally no need to worry about permanent brain damage. The skull provides substantial protection, and symptoms that resolve quickly typically indicate no serious long-term issue.

Can the adult brain regenerate after stroke or traumatic injury, and how do stem cells help?

Yes, the adult brain can recover function after injury, challenging the old notion that damaged circuits are permanently dead. Stem cells, rather than directly reconstituting circuits, primarily work by secreting powerful proteins and growth factors that modulate the immune system and promote native recovery through processes like angiogenesis and neurogenesis.

What is mild hypothermia and how is it used for neuroprotection?

Mild hypothermia involves reducing brain and body temperature by a few degrees (e.g., from 37°C to 33°C). It is a highly effective neuroprotective strategy in laboratory settings and has been proven beneficial for patients after cardiac arrest (global ischemia) and in neonatal hypoxic-ischemic injury, by blocking detrimental pathways leading to cell death and inflammation.

Is Platelet-Rich Plasma (PRP) effective for brain tissue repair or preservation?

Based on Dr. Steinberg's current understanding, there is no hard evidence to suggest that Platelet-Rich Plasma (PRP) is beneficial for helping recover or preserve brain tissue. PRP is distinct from stem cell therapy, containing very few, if any, stem cells.

How does vagal nerve stimulation (VNS) help chronic stroke patients?

Vagal nerve stimulation (VNS), coupled with intensive physical therapy, is an FDA-approved treatment for chronic stroke patients. It works by stimulating the vagus nerve in the neck, sending signals back to the brain to resurrect circuits or induce plasticity, thereby improving functions like arm movement.

Key Moments

How to Improve Brain Health & Offset Neurodegeneration | Dr. Gary Steinberg

Andrew Huberman

Science & Technology4 min read116 min video

May 20, 2024|297,784 views|6,742|495

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Key Moments

TL;DR

Dr. Gary Steinberg discusses brain health, strokes, TBIs, and advancements in neurosurgery and regenerative medicine.

Key Insights

Strokes result from blocked blood flow (ischemic) or vessel rupture (hemorrhagic), with risk factors including genetics, smoking, hypertension, and high lipids.

Minimally invasive neurosurgical techniques, including endovascular approaches, radiosurgery, and focused ultrasound, are increasingly used to treat brain conditions.

Transient Ischemic Attacks (TIAs) are temporary strokes, and while less common, spinal cord strokes can also occur with specific symptoms.

Lifestyle factors like avoiding smoking, excessive alcohol, and hard drugs, along with managing blood pressure and cholesterol, are crucial for brain health.

Recent research shows that damaged brain circuits can be resurrected, with stem cells and vagal nerve stimulation showing promise in recovery from stroke and TBI.

While caution is advised with unproven therapies, advancements in regenerative medicine, particularly stem cell research, offer hope for treating neurological injuries and diseases.

UNDERSTANDING STROKES AND VASCULAR BRAIN HEALTH

Dr. Gary Steinberg defines stroke as a 'heart attack of the brain,' primarily caused by blood clots blocking vessels (ischemic stroke) or less commonly, by hemorrhaging. He highlights that while genetic predispositions exist, modifiable lifestyle factors such as smoking, hypertension, and high cholesterol significantly increase stroke risk. Statins are noted for their vascular protective benefits, even beyond lowering LDL cholesterol. The discussion emphasizes the critical link between heart and brain health due to the brain's high demand for oxygen and nutrients.

ADVANCEMENTS IN NEUROSURGERY AND MINIMALLY INVASIVE TECHNIQUES

The conversation details the evolution of neurosurgery towards less invasive methods. Techniques like endovascular treatment, where catheters are navigated through blood vessels to treat aneurysms or remove clots, and radiosurgery (e.g., Gamma Knife, CyberKnife) using focused radiation, are transforming patient care without extensive open surgery. The use of focused ultrasound and deep brain stimulation is also expanding, offering new therapeutic avenues for various neurological conditions and even psychiatric disorders.

CONCUSSIONS, TBI, AND THEIR MANAGEMENT

Dr. Steinberg addresses traumatic brain injuries (TBIs) and concussions, noting that most head injuries are not from sports like football but from accidents. While CT scans might reveal contusions, they don't capture the molecular changes from concussion. Sophisticated neurological testing, including eye-tracking, is crucial for assessing recovery. He emphasizes the importance of avoiding repeated head impacts and suggests that while rest is important, complete sensory deprivation is not beneficial for recovery.

TEMPORARY ISCHEMIC ATTACKS AND SPINAL CORD STROKES

Transient Ischemic Attacks (TIAs) are described as reversible strokes, characterized by temporary neurological deficits that resolve. The definition has evolved with advanced imaging, now often identifying small strokes previously classified as TIAs. While less common than brain strokes, spinal cord strokes can occur due to disruptions in blood supply to the spinal arteries, leading to specific motor and sensory deficits depending on the location and affected arteries.

LIFESTYLE FACTORS AND EARLY INTERVENTION

Critical modifiable risk factors for stroke include smoking, excessive alcohol consumption, and illicit drug use like cocaine and methamphetamine, which damage blood vessels and increase blood pressure. Managing hypertension and cholesterol through lifestyle or medication is paramount. The discussion highlights that 'zero to two drinks per week' is generally considered safe alcohol consumption, with more increasing risks. Maintaining hydration and prioritizing sleep are also vital for overall brain and body health.

NEUROPROTECTION, REGENERATION, AND STEM CELL THERAPY

The concept that brain tissue cannot regenerate has been challenged. Research shows that adult brains have stem cell populations capable of neurogenesis. Mild hypothermia has demonstrated neuroprotective effects, particularly after cardiac arrest. Stem cell therapy, while still largely experimental, shows promise. Early trials suggest that stem cells, potentially acting through immune modulation and growth factor secretion, can promote plasticity and recovery in patients years after stroke or TBI, though rigorous clinical trials are essential.

THE ROLE OF EXERCISE AND NEURAL PLASTICITY

Physical activity, including exercise and physical therapy, is crucial for promoting brain recovery and plasticity, even years after an injury like a stroke. Techniques like constraint-induced movement therapy, where the unaffected limb is temporarily restrained to force the use of the injured limb, are being explored. This approach, along with other stimulation methods, aims to 'resurrect' dormant circuits and enhance the brain's ability to adapt and recover function, potentially turning the adult brain into a more 'plastic' state similar to that of a child.

EXPLORATORY SCANS AND CAUTION WITH UNPROVEN THERAPIES

While exploratory scans like full-body MRIs can potentially detect abnormalities early, they can also lead to over-diagnosis, unnecessary worry, and invasive follow-up procedures for findings without clinical significance. Similarly, claims surrounding therapies like Platelet-Rich Plasma (PRP) lack robust evidence for brain recovery. The expert strongly advises caution regarding unproven stem cell therapies offered internationally, citing risks of serious complications like vision loss or tumor development, emphasizing the need for FDA-approved, evidence-based treatments.

VAGAL NERVE STIMULATION FOR RECOVERY

Vagal nerve stimulation is emerging as a promising treatment, particularly when coupled with intensive physical therapy for stroke recovery. The FDA-approved invasive method involves implanting a stimulator that is thought to work by stimulating the brain itself, promoting plasticity and circuit resurrection rather than solely influencing peripheral autonomic functions. This technique is also being explored for conditions like depression, highlighting the brain's complex response to neurostimulation.

Mentioned in This Episode

●Supplements

●Products

●Tools

●Companies

●Organizations

●Concepts

●People Referenced

Common Questions

A stroke is a disruption of blood flow to the brain, like a heart attack of the brain, caused by either a blocked vessel (ischemic stroke, 87%) or a hemorrhage (bursting vessel, 13%). An aneurysm is a blister or balloon-like bulge on a blood vessel that can rupture, causing a hemorrhage. A hemorrhage broadly refers to internal bleeding.

Topics

Health & Longevity Neuroscience & the Brain Brain Plasticity Stem Cell Therapy Traumatic Brain Injury Medicine & Clinical Stroke Prevention Vagal Nerve Stimulation Cardiac Arrest

Mentioned in this video

People

Gary Steinberg

Medical doctor, PhD, professor of neurosurgery, neurosciences, and neurology at Stanford University School of Medicine, and a world expert in cerebrovascular architecture of the brain.

Alan Adler

Former Stanford engineer and inventor who developed the Aerobie Frisbee and the Aeropress coffee maker.

Andrew Huberman

Host of the Huberman Lab podcast and professor of neurobiology and ophthalmology at Stanford School of Medicine.

Steve Young

Former quarterback for the 49ers, treated by Dr. Steinberg for concussions, who eventually retired due to head injuries and became involved in concussion research.

Timothy Schallert

Researcher known for work on constraint-induced movement therapy in animal models for rehabilitation after brain damage.

Theresa Jones

Researcher known for work on constraint-induced movement therapy in animal models for rehabilitation after brain damage.

Products

Eight Sleep Pod 4 Ultra

Newest generation of Eight Sleep's mattress cover with improved cooling, heating, higher fidelity sleep tracking, and snoring detection.

Aeropress

Coffee press that brews coffee with no bitterness and excellent taste due to a short contact time between hot water and coffee, making it quick and easy to use.

Companies

ROKA

Manufacturer of high-quality eyeglasses and sunglasses designed for sport and daily wear, known for being lightweight and slip-resistant.

Athletic Greens

A foundational nutritional supplement providing vitamins, minerals, adaptogens, and micronutrients, supporting gut, immune system, and brain health.

Eight Sleep

Company that makes smart mattress covers with cooling, heating, and sleep tracking capabilities, important for optimizing core body temperature for sleep.

LMNT

An electrolyte drink containing sodium, magnesium, and potassium in balanced ratios, without sugar, important for hydration and cellular function.

Concepts

Factor V Leiden

A genetic mutation affecting clotting factors, with heterozygotes having one mutant copy and homozygotes having a much greater risk for clotting and bleeding.

Parkinson's disease

A neurodegenerative disorder for which brain stimulation with implanted electrodes is an effective treatment for medically intractable cases.

Gamma Knife

A form of radiosurgery that uses focused radiation from a Cobalt source to treat brain conditions without opening the skull.

Alzheimer's disease

A neurodegenerative condition for which some studies suggest statins may reduce the risk of cognitive decline.

Constraint-Induced Movement Therapy

A rehabilitation technique where the uninjured limb is restrained to force the use of the weaker, injured limb, promoting plasticity and recovery of function.

Vagus Nerve Stimulation

An invasive treatment involving an implanted stimulator on the vagus nerve in the neck, shown to improve arm function in chronic stroke patients and used for depression and epilepsy.

Focused Ultrasound

A non-invasive treatment that focuses sound waves on specific brain areas, used for essential tremor, Parkinson's disease, and emerging tumor treatment.

Chronic Traumatic Encephalopathy

A neurodegenerative disease linked to repeated head trauma, initially known in boxers and later identified in football players.

Functional MRI

A type of MRI scan that maps brain activity by detecting changes in blood flow, used during surgery to identify speech areas.

Epilepsy

A neurological disorder characterized by seizures, for which brain stimulation has been shown to be beneficial based on Stanford-led trials.

MRI

An imaging technique used for whole-body or brain scans, sometimes performed for exploratory or preventative purposes, revealing disc bulges, white matter spots, or other growths.

Drugs & Medications

Eliquis

A new oral anticoagulant (blood thinner) that reduces the risk of clotting but increases hemorrhage risk.

Heparin

An anticoagulant that thins the blood, also increasing the risk for hemorrhage.

Statins

Medications very effective in lowering bad cholesterol (LDL), preventing strokes and heart attacks, and shown to be beneficial for blood vessel integrity even without high LDL.

CyberKnife

A form of radiosurgery invented at Stanford that uses focused X-rays to treat brain conditions without opening the skull.

Coumadin

An anticoagulant medication that thins the blood, increasing the risk for hemorrhage.

Organizations

49ers

A professional American football team for which Dr. Steinberg served as neurosurgeon from 1990-2000, leading to his involvement in concussion research.

Stanford University School of Medicine

Academic institution where Dr. Andrew Huberman and Dr. Gary Steinberg are professors, focused on medical education and research.

California Institute for Regenerative Medicine

A government agency that provided a $12 million grant for Dr. Steinberg's stem cell trial for stroke therapy.

Supplements

Aspirin

An antiplatelet agent that thins the blood, useful for treating people predisposed to clots but increases hemorrhage risk if a vessel bursts.