Tampilkan postingan dengan label Old. Tampilkan semua postingan
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Minggu, 19 Maret 2017

Panic attack symptoms 4 year old


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Sabtu, 04 Maret 2017

Doctors and Tales from Their Old Wives the Woozle Effect





In my blogpost of 2/24/25, I made fun of scientists who waste research dollars proving things that are already obvious. Some people may object that things that are thought to be obvious sometimes turn out to be false. Of course that happens, but because it happens so rarely, it tends to make the news. 

This may lead some to think such discoveries are common. They are not. As I have said, you really don't need a study to prove that the sky appears blue to non-colorblind humans at noon on a cloudless sunny day on the equator.

There is another related situation which is also quite common - scientific ideas that were thought by many to be obvious turn out, on closer inspection, not to really be obvious at all. 

And not true. They are basically old wives' tales, and are instead based on frequent citations from the scientific literature of poorly-designed studies and/or less-than-well-thought out conclusions drawn from those studies. Such ideas become urban myths.

I have written about several of these in previous posts, and there are undoubtedly dozens and dozens more, many of which I may not be aware. Some completely fictional ideas that come to mind: the human brain only works at 20% of its capacity. We are born with all the brains cells we will ever have. Debriefing for first responders (reviewing in detail what they had just witnessed during a gory disaster) helps prevent post-traumatic stress disorder. Benzodiazepine drugs like valium and xanax interfere with a behavioral treatment called systematic desensitization.

Much to my surprise, I recently learned that there is actually a name for this phenomenon. It is called the Woozle Effect. 

According to Wikipedia, "A Woozle is an imaginary character in the A. A. Milne book Winnie-the-Pooh, published in 1926. In chapter three, 'In Which Pooh and Piglet Go Hunting and Nearly Catch a Woozle,' Winnie-the-Pooh and Piglet start following tracks left in snow believing they are the tracks of a Woozle. 

The tracks keep multiplying. Christopher Robin then explains that they have been following their own tracks in circles around a tree."

The Wikipedia article also points out something about this phenomenon that relates to another frequent topic of this blog: groupthink. The Woozle belief persists because it serves the needs of some group of scientists, doctors, or other interest group - whether those needs are ideological, economic, or bureaucratic.

Sabtu, 11 Februari 2017

Pharma Still Up to its Old Tricks





It looks as though big Pharma is still up to one of its most disturbing practices: not publishing or making public studies that show that its products might be ineffective. As described by my colleague Peter Parry later in this post, we had thought this problem was successfully addressed back in 2010.  

Apparently not.

And do not think this problem is unique to psychiatric medications. 

Of course, as I have pointed out several times in this blog, recruitment and assessment of subjects for many research studies these days has become so warped by financial incentives that many of the studies, published or not, are not worth the paper they are printed on to begin with. 

And some studies are purposely designed to mislead readers into believing that certain generic drugs, particularly antidepressants, are not effective when in fact, when used properly for the right patients, they are among the most effective drugs in all of medicine. But that's a 'hole 'nuther issue.

To get back to the issue at hand:

From Medscape, 10/29/13: 

An analysis of nearly 600 registered clinical trials published online October 29 in BMJ has shown that 29% remained unpublished 5 years after completion, that no results were available in ClinicalTrials.gov for three fourths of those unpublished trials, and that industry-funded trials were nearly twice as likely to go unreported as studies that had not received industry funding.

Previous studies have shownthat published trials contain less than half of the patient-outcomes data contained in company-controlled documents.

Dr. Jones and colleagues from the University of North Carolina, Chapel Hill, conducted a cross-sectional analysis of trials that had at least 500 participants and had been prospectively registered with Clinical Trials.gov and completed before January 2009. 

Their analysis included 585 registered trials, 171 of which (29%) remained unpublished. These unpublished studies included nearly 300,000 participants.

"By focusing our investigation on studies with at least 500 participants, we greatly limited the possibility that non-publication of trials in this cohort was due to rejection of manuscripts by journals or a lack of time or interest on the part of investigators or sponsors," the authors write.

The non-publication rate was 32% for industry-funded trials and 18% for those without industry funding (P = .003), and 78% of the unpublished trials also had no reported data in ClinicalTrials.gov.

From Peter Parry (on the webpage TheConversation.Edu.Au):


Dr. Peter Parry
A large proportion of drug trials, particularly those sponsored by pharmaceutical companies, never get published, skewing our picture of drugs' effectiveness and safety.
Research published in 2010 showed results unfavorable to sponsored drugs are less likely to be published, or selectively published to put a favorable spin on poor results.  And internal pharmaceutical industry documents released from court cases show concealment of data is a widespread practice.

A colleague and I assessed such documents about psychiatric medications from five pharmaceutical companies. The papers suggested widespread overstatement of benefits and understatement of adverse effects. Other researchers have found similar problemswith different drugs.
In response, some medical journals voluntarily agreed to publish only studies registered on a website of the US National Institutes of Health, ClinicalTrials.gov. At least studies with unfavorable results would not be buried by drug companies. But the BMJ article confirms that many registered studies still don’t get published.

The AllTrials initiative aims to make the (de-identified) results and methodology of drug trials available to independent researchers so journals can publish in-depth articles based on all of the full data.

In 11 months, the campaign’s petition has gathered over 59,000 individual signatories and over 400 medical and health-care organizations. These include many British medical colleges and learned academic medical science institutions, such as the Cochrane Collaboration and the British National Institute for Health and Clinical Excellence (NICE).

Although the campaign is progressing slower outside the United Kingdom, it is managing to get some traction internationally.

The World Association of Medical Editors (WAME), the South African Medical Research Council and the Canadian Agency for Drugs and Technology in Health have signed.

Maybe there is still hope this problem can be rectified.