Dr. Patrick Nemechek discusses “brain blood pressure,” also called cerebral perfusion pressure, and why he believes low cerebral perfusion (“cerebral hypoperfusion”) can be a major driver of day-to-day symptoms in children with autism.
In the video, he first uses a familiar example—post-concussion symptoms in otherwise neurotypical teens and adults—to describe how low brain blood pressure can make oxygen delivery to neurons more difficult. He then contrasts that with his clinical observation that, in autism, this “brain low pressure” picture can be far more severe and disruptive.
Important note: This article summarizes Dr. Nemechek’s explanations and clinical interpretations from the video. It is educational and not a substitute for individualized medical care.
What Dr. Nemechek means by cerebral perfusion pressure
Dr. Nemechek explains cerebral perfusion pressure as the pressure needed to push oxygenated red blood cells up to the brain so oxygen can “jump” (diffuse) from the red blood cells into neurons. In his description, neurons have very little extra oxygen reserve (“only one second” of extra oxygen), so if the system that maintains brain blood pressure is not working correctly, symptoms can appear quickly.
He emphasizes posture as an everyday stress test for this system: when you stand up against gravity, the body must increase pressure to keep flow and oxygen delivery adequate. In his explanation, if the nervous system does not regulate this correctly, standing can lead to a sudden pressure dip and a “whoa” or lightheaded feeling from reduced oxygen delivery.
How this “brain low pressure” can show up clinically
In the video, Dr. Nemechek links low cerebral perfusion to symptoms often described as difficulty focusing, memory problems, and “brain fog.” He also states directly, in his clinical framing, that attention deficit disorder is cerebral hypoperfusion—“brain low pressure.”
He then extends this concept to autism, stating that in kids with autism the low-pressure problem can be “a hundred times worse” than what he sees in a neurotypical teenager with ADD, and that this low pressure accounts for many symptoms in autistic children.
Behavioral and day-to-day patterns he attributes to low cerebral perfusion
According to Dr. Nemechek, when the brain is not getting enough oxygen, it “panics” and tries to find ways to raise pressure. He describes several patterns he commonly sees and interprets as compensations:
- Hyperactivity and constant movement (pacing, rocking, running), which he describes as a way to constrict leg muscles to boost pressure to the head.
- Toe walking, which he explains can tighten leg and pelvic muscles and thereby increase pressure to the brain.
- Difficulty sitting through meals, which he attributes to pressure dropping while sitting still, prompting the child to get up and move.
- Craving salt and carbohydrates, with examples like “chicken nuggets and fries.”
- Thirst.
- Laying down flat during bad days. He describes children who may repeatedly lie down after only a short distance when being walked (e.g., down a driveway), interpreting this as the child’s brain reacting as though they may pass out or are “drowning” because they are not getting enough oxygen.
He also notes that these children may have very little impulse control, and in his view they follow these brain-driven commands immediately.
Why Dr. Nemechek thinks it can be so severe in autism
Dr. Nemechek anticipates a common question: where does this “injury” come from? He contrasts many adult cases—where he says people often have a long history of “different kinds of injuries,” physical and emotional, and inflammatory triggers that progressively worsen the problem—with children, who “don’t have that much time” to accumulate those factors.
In the framework he discusses (and referencing what he describes as “interesting work in animal models”), Dr. Nemechek says he believes a process may occur in which bacteria from the colon grow abnormally in the small intestine and release a chemical called propionic acid. He states that propionic acid has been shown to cause a chemical injury in animal models, and he adds that he is suspicious that propionic acid—or some other compound leaking through—may be injuring the nervous system and making the low-perfusion problem “so bad.”
Stress hormones, anxiety, and intense episodes
Dr. Nemechek adds that if children are unable to handle the low-pressure state, they may release norepinephrine or epinephrine (stress hormones). In his description, this can make children anxious, panicky, tearful, or aggressive.
He also describes how parents may interpret these episodes as tantrums, sometimes noting the child’s eyes are dilated and it can feel “like an animal.” In his explanation, this reflects a stress-hormone-driven survival response occurring when the brain perceives inadequate oxygen delivery.
Dr. Nemechek’s clinical strategy: reduce inflammation, and sometimes add a “boost”
Dr. Nemechek’s primary emphasis is that, if you can get inflammation down with his protocol, these children can recover from the low-pressure state. He frames this as the foundational step (“get on the protocol, get their inflammation down”).
He also notes that, along the way, some children may need an additional “boost.” In the video, he mentions using a medication called midodrine (he pronounces it as “madrin”), describing it as gently increasing pressure. He cautions that, in his view, it does not fully normalize pressure and is “not that powerful,” but can help “cut through” the problem so children calm down, become less hyper, and have improved attention and ability to focus on what is in front of them.
He further mentions other medications (he cites “Strattera” and “Ritalin”) as sometimes helpful, while also noting they penetrate the brain and can cause “a little bit too much stimulation.”
Key takeaway from the video
In Dr. Nemechek’s clinical interpretation, a great deal of disruptive symptoms seen throughout the day in autistic children can be traced to low cerebral perfusion pressure (brain low pressure). His strategy, as outlined here, centers on addressing inflammation through his protocol and selectively using supportive measures when needed.
Educational medical disclaimer: This content is for general education only and reflects statements made in the referenced video. It is not medical advice and is not a diagnosis or treatment plan. If you suspect your child has symptoms related to blood pressure regulation, attention, anxiety, or behavior changes, seek evaluation and guidance from a qualified clinician.
