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Whooping Cough Epidemic

The Washington State Department of Health has released a statement stating that they are in the midst of a whooping cough epidemic, which will likely reach its highest levels in decades. So far this year there have been 640 cases, compared to 94 cases over the same time period last year. This is a dramatic increase. Whooping cough is a vaccine preventable disease, and so the resurgence of this infection raises questions about the efficacy of the vaccine program – specifically, to what extent is this increase due to vaccine refusal vs waning efficacy of the vaccine itself?

Background

Whooping cough is caused by the Bordetella pertussis bacterium (a Gram-negative, aerobic coccobacillus, for those who are interested), which produce a toxin that paralyzes respiratory cells and causes inflammation. The result begins like an ordinary upper respiratory infection (a common cold) but then develops into a severe cough which can last for weeks. The name of the disease, whooping cough, comes from the sound made by the sudden inhalation after a sustained cough. The disease can be severe at any age, but is especially pernicious in infants, in whom it can cause apnea, or brief pauses in breathing. In infants less than 1 year of age half will need to be hospitalized and 1 in 100 will die.

The pertussis bacterium was first isolated in 1906 by Belgian scientists Jules Bordet and Octave Gengou. In 1939 researchers at the Michigan Department of Public Health demonstrated the efficacy of a vaccine against Bodetella pertussis. The vaccine reduced the incidence of whooping cough from 15.1 to 2.3% and reduced the severity of the illness in those who contracted it. In 1948 the whole cell pertussis vaccine was combined with vaccines for diptheria and tetanus to make the DTP vaccine.

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Posted in: Vaccines

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A Universal Anti-Cancer Drug?

We frequently deal with fraud and quackery on this blog, because part of our mission is to inform the public about such things, and also they are great examples for explaining the difference between legitimate and dubious medical claims. It is always our goal not just to give a pronouncement about this or that therapy, but to work through the logic and evidence so that or readers will learn how to analyze claims for themselves, or at least know when to be skeptical.

One skepticism-inducing red flag is any treatment that claims to treat a wide range of ailments, especially if those ailments are known to have difference causes and pathophysiologies. Even claiming that one treatment might be effective against all cancer is dubious, because cancer is not one disease, but a category of disease. We are fond of pointing out that there are many types and stages of cancer, and each one requires individualized treatments. As an aside, it is ironic that CAM proponents often simultaneously tout how individualized their treatment approach is, but then claim that one product or treatment can cure all cancer. Meanwhile they criticize the alleged cookie-cutter approach of mainstream medicine, which is actually producing a more and more individualized (and evidence-based) approach to such things as cancer.

In any case – my immediate response to any article or website claiming to treat most or all cancer is to be highly skeptical, but I reserve final judgment until after I read through the details. What kinds of evidence are being presented to support the claims, and what are the alleged mechanisms of action? Are those making the claims being cautious like a scientist should, or are they being promotional like a used-car salesman?

A recent study claiming a potential treatment for many types of cancer has been making the rounds. The title of the article being circulated is, One Drug to Shrink All Tumors. What made me take immediate interest in this article was that it was not on a dubious website, sensational tabloid, or even mainstream news outlet, but on the news section of the American Academy for the Advancement of Science (AAAS) website. This is a report of serious medical research. The title, I suspect, is perhaps a bit more sensational than it otherwise would have been because of a geeky nod to the “one ring to bind them all” Lord of the Rings quote. Regardless of the source and the headline – what is the science here?

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Posted in: Cancer

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Disparities in Regional Health Care Costs

In 2009, during the “Obamacare” debate that was dominating the news, Atul Gawande wrote an article in the New Yorker that was widely praised and cited, including by president Obama himself. The article is a thought-provoking discussion of why some communities in the US have much higher health care costs than other regions. I took two main conclusions from the article.

The first is the success of the Mayo model – organizing care as a team approach. The idea here is to pool optimal expertise in the care of each patient. Greater expertise leads to “more thinking and less testing,” as Gawande puts it. I agree with this. It takes expertise to be comfortable not doing a test. Often testing is ordered because a physician does not feel secure in their diagnostic assessment.

The second main conclusion was the McAllen model, a town in Texas that has double the average Medicare costs per capita in the country. Gawande concluded that these increased costs are likely due to the culture of medical practice in the region, leading to greater unnecessary care and procedures. He wrote:

The Medicare payment data provided the most detail. Between 2001 and 2005, critically ill Medicare patients received almost fifty per cent more specialist visits in McAllen than in El Paso, and were two-thirds more likely to see ten or more specialists in a six-month period. In 2005 and 2006, patients in McAllen received twenty per cent more abdominal ultrasounds, thirty per cent more bone-density studies, sixty per cent more stress tests with echocardiography, two hundred per cent more nerve-conduction studies to diagnose carpal-tunnel syndrome, and five hundred and fifty per cent more urine-flow studies to diagnose prostate troubles. They received one-fifth to two-thirds more gallbladder operations, knee replacements, breast biopsies, and bladder scopes. They also received two to three times as many pacemakers, implantable defibrillators, cardiac-bypass operations, carotid endarterectomies, and coronary-artery stents. And Medicare paid for five times as many home-nurse visits. The primary cause of McAllen’s extreme costs was, very simply, the across-the-board overuse of medicine.

Is that, however, a necessary conclusion from that data? The data support the conclusion that McAllen (the highest cost region) uses many more medical procedures than El Paso (the lowest cost region), but does that necessarily equate to “overuse” of medicine? Evidence does not support the conclusion that the population in McAllen is sicker than El Paso, but it is also possible that El Paso simply underdelivers care.

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Posted in: Politics and Regulation, Public Health

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Acupuncture for Migraine

A recent study looking at acupuncture for the prevention of migraine attacks demonstrates all of the problems with acupuncture and acupuncture research that we have touched on over the years at SBM. Migraine is one indication for which there seems to be some support among mainstream practitioners. In fact the American Headache Society recently recommended acupuncture for migraines. Yet, the evidence is simply not there to support this recommendation, which, in my opinion, is a failure to understand a science-based assessment of the clinical evidence.

The recent study, like many acupuncture studies, was problematic, and was also negative. It showed that acupuncture does not work for migraines, but of course also contains the seeds of denial for those who want to believe in acupuncture. From the abstract:

METHODS:
We performed a multicentre, single-blind randomized controlled trial. In total, 480 patients with migraine were randomly assigned to one of four groups (Shaoyang-specific acupuncture, Shaoyang-nonspecific acupuncture, Yangming-specific acupuncture or sham acupuncture [control]). All groups received 20 treatments, which included electrical stimulation, over a period of four weeks. The primary outcome was the number of days with a migraine experienced during weeks 5-8 after randomization. Our secondary outcomes included the frequency of migraine attack, migraine intensity and migraine-specific quality of life.
RESULTS:
Compared with patients in the control group, patients in the acupuncture groups reported fewer days with a migraine during weeks 5-8, however the differences between treatments were not significant (p > 0.05). There was a significant reduction in the number of days with a migraine during weeks 13-16 in all acupuncture groups compared with control (Shaoyang-specific acupuncture v. control: difference -1.06 [95% confidence interval (CI) -1.77 to -0.5], p = 0.003; Shaoyang-nonspecific acupuncture v. control: difference -1.22 [95% CI -1.92 to -0.52], p < 0.001; Yangming-specific acupuncture v. control: difference -0.91 [95% CI -1.61 to -0.21], p = 0.011). We found that there was a significant, but not clinically relevant, benefit for almost all secondary outcomes in the three acupuncture groups compared with the control group. We found no relevant differences between the three acupuncture groups.

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Posted in: Acupuncture

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Anti-Smoking Laws – The Proof of the Pudding

One consistent theme of SBM is that the application of science to medicine is not easy. We are often dealing with a complex set of conflicting information about a complex system that is difficult to predict. That is precisely why we need to take a thorough and rigorous approach to information in order to make reliable decisions.

The same is true when applied to an individual patient. Often times we cannot make a single confident diagnosis based upon objective information. We have to be content with a diagnosis that is based partly on probability or on ruling out other possibilities. Sometimes we rely upon a so-called “therapeutic trial” to help confirm a diagnosis. If, for example, it is my clinical impression that a patient is probably having seizures, but I have no objective information to verify that (EEG and MRI scans are normal, which is often the case) I can help confirm the diagnosis by giving the patient an anti-seizure medication to see if that makes the episodes stop, or at least become less frequent. Placebo effects make therapeutic trials problematic, but if you have an objective outcome measure and a fairly dramatic response to treatment, that at least raises your confidence in the diagnosis.

We can apply the same basic principle on the population level. If a public health intervention is addressing the actual cause of one or more diseases, then we should see some objective markers of disease frequency or severity decrease over time. Putting fluoride in the public water supply decreased the incidence of tooth decay. Adding iodine to salt decreased the incidence of goiter. Fortifying milk with vitamin D decreased the incidence of rickets.  However, removing thimerosal from the childhood vaccine schedule did not reduce the incidence of autism (or the rate of increase in autism diagnosis). That is because calcium deficiency causes rickets, but thimerosal (or the mercury it contains) does not cause autism.

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Posted in: Public Health

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Pyroluria and Orthomolecular Psychiatry

I have previously written about psychomotor patterning – an alleged treatment for developmental delay that was developed in the 1960s. The idea has its roots in the notion of ontogeny recapitulates phylogeny, that as we develop we progress through evolutionary stages. This idea, now largely discredited, was extended to the hypothesis that in children who are developmentally delayed their neurological development could be enhanced if they were made to progress through evolutionary stages. Children were put through hours a day of passive crawling, for example, with the belief that this coax the brain into a normal developmental pathway. The treatment was studied extensively in the 1970s showing that the treatment did not work.

However, those who developed this treatment, Doman and Delecato, did not want to give up on their claim to fame simply because it didn’t work and the underlying concepts were flawed. For the last 40 years they have continued to offer the Doman-Delecato treatment for all forms of mental retardation, surviving on the fringe, all but forgotten by mainstream medicine (except by those with an interest in pathological science).

I was recently asked to look into the claims for a disorder known as pyroluria, and what I found was very similar to the history of psychomotor patterning. There was some legitimate scientific interest in this alleged condition in the 1960s. Studies in the 1970s, however, discredited the hypothesis and it was discarded as a failed hypothesis. The published literature entirely dries up by the mid 1970s. But the originators of the idea did not give up, and continue to promote the idea of pyroluria to this day.

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Posted in: Neuroscience/Mental Health

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Social Anxiety – There’s An App for That?

When I first heard about studies using smartphones to treat anxiety with cognitive therapy I was intrigued, to say the least. However, I had a misconception about what that actually meant. My assumption was that the smartphone app would be automating some basic cognitive therapy, a virtual therapist that could give some reflective feedback and also give basic cognitive tools to deal with anxiety. That sounded like it might be useful, at least for mild cases, and I hoped that the app was designed to refer severe cases to an actual therapist.

I had already been very interested in the concept of online, virtual, or computer-based therapy. It seems like this is coming, but of course it needs to be researched to see how it works and for which patients.

But that is not what the smartphone app is at all. Rather it has to do with a treatment technique called cognitive bias modification (CBM). This therapy is based on research that finds that those with social anxiety have a cognitive bias which makes them attend more than others to signs of threat or to negative emotions. Further, they have a cognitive bias to interpret ambiguous social cues as hostile or negative. This raises a cause and effect question – are they anxious because they have these cognitive biases, or does the anxiety make them attend to negative emotions and interpret emotions negatively. Perhaps it is both, in a reinforcing feedback loop.

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Posted in: Neuroscience/Mental Health, Science and Medicine

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Bravewell Puts Integrative Cart Before Science Horse

The Bravewell Collabortive is a private organization whose stated mission is to, “accelerate the adoption of integrative medicine within the health care system.” They are well-funded, and they have successfully used their money to advance their mission. They also now appear to be an effective propaganda machine, producing what they are calling a “landmark report” on the use of integrative medicine in the US. The report is indeed revealing, but perhaps not in the way Bravewell intends.

The report is simply a survey of 29 integrative centers in the US. Before presenting the major findings the report defines “integrative medicine:”

“an approach to care that puts the patient at the center and addresses the full range of physical, emotional, mental, social, spiritual, and environmental influences that affect a person’s health. Employing a personalized strategy that considers the patient’s unique conditions, needs, and circumstances, it uses the most appropriate interventions from an array of scientific disciplines to heal illness and disease and help people regain and maintain optimum health.”

This is the standard marketing propaganda, which we have dissected many times before (so one more time won’t hurt). It is important to note that this is not a legitimate philosophy or approach to medicine, but pure marketing hype with the purpose of rebranding medical pseudoscience and quackery.  There is a growing list of terms used for this rebranding – first “alternative” or “holistic” then “complementary” now “integrative”, “personalized”, and “patient-centered.” It’s the same nonsense, only the labels have evolved (market-tested, if you will).

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Posted in: Science and Medicine

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Teaching Pseudoscience In Universities

The debate about teaching so-called complementary and alternative medicine (CAM) in universities and medical schools rages on. Attention has turned recently to Australia, where the infiltration of CAM into universities is a growing problem. A new group has formed called the Friends of Science in Medicine to advocate for maintaining high standards of science in medical academia. They have been successful in at least invigorating the debate, leading to a slew of articles on the topic, many of which are reasonable. They have also forced CAM proponents to defend their position, which they do with the usual bad logic and invalid arguments.

The Problem

It is a sign of our times that we even have to defend having standards of good science in the practice of medicine and the teaching of a science-based curriculum in universities. This is an issue we have discussed at length on SBM often. The core philosophy of SBM is that high standards of science in medicine are necessary in order to ensure, as best as we can, that treatments and interventions are safe and effective. It is extremely complicated and tricky to determine safety and efficacy. Humans suffer from numerous mechanisms of self-deception, cognitive flaws and biases, poor grasp of statistics, and perceptual failings that are likely to lead us astray. In fact our biases tend to systematically lead us to false conclusions that we wish to be true, rather than the truth.

Science is the only system that we have developed that systematically controls for all of these biases and flaws to see through to reliable information. Science endeavors to be transparent, thorough, and rigorous. The applications of scientific principles has demonstrably transformed medicine (and human knowledge in general) for the better. As a society we should not lightly abandon the principles of science nor try to change them to meet the needs of the current fads.

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Posted in: Medical Academia

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Mass Media Attention Psychogenic Syndrome – MMAPS

By now you have probably heard of the middle and high school children in LeRoy, NY who have come down with what some reports are calling a “mystery” illness. Of course it is almost obligatory to note in such stories that doctors or experts are “baffled.” There are several features of this story that are interesting from a science-based medicine and also just a critical thinking point of view – the media response, how such ailments are diagnosed, the publicity around a private medical condition, and the speculation from many camps that appears ideologically motivated.

To first review the facts of the case, there are now 15 children affected with involuntary tics, which are sudden “jerk-like” motor movements. They all attend the same junior-senior high school and so range in age from 12-18, with onset of symptoms from October to January of the current school year.  All but one of them are girls. All of the children have been examined by pediatric neurologists, 12 of the 15 at the Dent neurological institute by the same two neurologists, including Dr. Lazlo Mechtler.

Dr. Mechtler, and in fact all of the pediatric neurologists who have examined any of the children, have come to the same diagnosis: conversion disorder and mass psychogenic illness. A conversion disorder occurs when psychological stress manifests as physical symptoms. We take this for granted to some degree – when people feel anxious they may get sweaty, nauseated, short of breath, and have palpitations. People with panic attacks can have these symptoms and also difficulty swallowing, and episodes that may resemble certain types of seizures with feelings of being separate from reality or from themselves. These are physical symptoms resulting from pure emotional stress. But in some cases psychological stress can also lead to neurological symptoms – pretty much any neurological symptoms, such as weakness, difficulty speaking, loss of vision, and involuntary movements.

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Posted in: Epidemiology, Neuroscience/Mental Health

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