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PET Scans Predict Coma Outcome

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A new study shows that 42 really is the answer to life, the universe, and everything. OK, not really, but it does show that 42% of healthy brain activity is the minimum threshold for consciousness.

Disorders of consciousness, also referred to as coma when severe enough, can be a difficult situation to assess sufficiently to make reliable predictions about outcome. Part of the problem is that once someone is not able to maintain consciousness, we lose much of the neurological exam, and therefore it becomes more difficult to assess brain function other than to say that they are not conscious.

Types of coma

Two types of coma in particular are of interest: the persistent vegetative state, also called unresponsive wakefulness syndrome (UWS), and the minimally conscious state (MCS). Both are severe impairments of consciousness. In UWS, by definition, the patient may have sleep-wake cycles, open their eye, have roving eye movements, and grimace, but they do not have any interaction with their environment. They do not respond to voice, look at faces, or move in response to stimuli.

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Posted in: Neuroscience/Mental Health

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Dr. Amen’s Love Affair with SPECT Scans

Daniel Amen loves SPECT scans (Single Photon Emission Computed Tomography). And well he should. They have brought him fame and fortune. They have rewarded him with a chain of Amen Clinics, a presence on PBS, lucrative speaking engagements, a $4.8 million mansion overlooking the Pacific Ocean, and a line of products including books, videos and diet supplements (“nutraceuticals”).  He grossed $20 million last year.   Amen is a psychiatrist who charges patients $3,500 to take pretty colored SPECT pictures of their brains as an aid to the diagnosis and treatment of conditions including brain trauma, attention-deficit hyperactivity disorder (ADHD), addictions, anxiety, depression, dementia, and obesity. He even does SPECT scans as a part of marriage counseling and for general brain health checkups.

SPECT imaging uses an injected radioisotope to measure blood flow in different areas of the brain. Amen is exposing patients to radiation and charging them big bucks because his personal experience has convinced him SPECT is useful. So far, he has failed to convince the rest of the scientific medical community.

Amen has just published an article in the journal Alternative Therapies entitled “It’s Time to Stop Flying Blind: How Not Looking at the Brain leads to Missed Diagnoses, Failed Treatments, and Dangerous Behaviors.”  It amounts to poorly-reasoned apologetics with false analogies, testimonials, and pretty pictures that don’t prove what he thinks they prove. (more…)

Posted in: Neuroscience/Mental Health

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