from the world's big
Duke University researchers might have solved a half-century old problem.
- Duke University researchers created a hydrogel that appears to be as strong and flexible as human cartilage.
- The blend of three polymers provides enough flexibility and durability to mimic the knee.
- The next step is to test this hydrogel in sheep; human use can take at least three years.
Duke researchers have developed the first gel-based synthetic cartilage with the strength of the real thing. A quarter-sized disc of the material can withstand the weight of a 100-pound kettlebell without tearing or losing its shape.
Photo: Feichen Yang.<p>That's the word from a team in the Department of Chemistry and Department of Mechanical Engineering and Materials Science at Duke University. Their <a href="https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.202003451" target="_blank">new paper</a>, published in the journal,<em> Advanced Functional Materials</em>, details this exciting evolution of this frustrating joint.<br></p><p>Researchers have sought materials strong and versatile enough to repair a knee since at least the seventies. This new hydrogel, comprised of three polymers, might be it. When two of the polymers are stretched, a third keeps the entire structure intact. When pulled 100,000 times, the cartilage held up as well as materials used in bone implants. The team also rubbed the hydrogel against natural cartilage a million times and found it to be as wear-resistant as the real thing. </p><p>The hydrogel has the appearance of Jell-O and is comprised of 60 percent water. Co-author, Feichen Yang, <a href="https://today.duke.edu/2020/06/lab-first-cartilage-mimicking-gel-strong-enough-knees" target="_blank">says</a> this network of polymers is particularly durable: "Only this combination of all three components is both flexible and stiff and therefore strong." </p><p> As with any new material, a lot of testing must be conducted. They don't foresee this hydrogel being implanted into human bodies for at least three years. The next step is to test it out in sheep. </p><p>Still, this is an exciting step forward in the rehabilitation of one of our trickiest joints. Given the potential reward, the wait is worth it. </p><p><span></span>--</p><p><em>Stay in touch with Derek on <a href="http://www.twitter.com/derekberes" target="_blank">Twitter</a>, <a href="https://www.facebook.com/DerekBeresdotcom" target="_blank">Facebook</a> and <a href="https://derekberes.substack.com/" target="_blank">Substack</a>. His next book is</em> "<em>Hero's Dose: The Case For Psychedelics in Ritual and Therapy."</em></p>
An algorithm may allow doctors to assess PTSD candidates for early intervention after traumatic ER visits.
- 10-15% of people visiting emergency rooms eventually develop symptoms of long-lasting PTSD.
- Early treatment is available but there's been no way to tell who needs it.
- Using clinical data already being collected, machine learning can identify who's at risk.
The psychological scars a traumatic experience can leave behind may have a more profound effect on a person than the original traumatic experience. Long after an acute emergency is resolved, victims of post-traumatic stress disorder (PTSD) continue to suffer its consequences.
In the U.S. some 30 million patients are annually treated in emergency departments (EDs) for a range of traumatic injuries. Add to that urgent admissions to the ED with the onset of COVID-19 symptoms. Health experts predict that some 10 percent to 15 percent of these people will develop long-lasting PTSD within a year of the initial incident. While there are interventions that can help individuals avoid PTSD, there's been no reliable way to identify those most likely to need it.
That may now have changed. A multi-disciplinary team of researchers has developed a method for predicting who is most likely to develop PTSD after a traumatic emergency-room experience. Their study is published in the journal Nature Medicine.
70 data points and machine learning
Image source: Creators Collective/Unsplash
Study lead author Katharina Schultebraucks of Columbia University's Department Vagelos College of Physicians and Surgeons says:
"For many trauma patients, the ED visit is often their sole contact with the health care system. The time immediately after a traumatic injury is a critical window for identifying people at risk for PTSD and arranging appropriate follow-up treatment. The earlier we can treat those at risk, the better the likely outcomes."
The new PTSD test uses machine learning and 70 clinical data points plus a clinical stress-level assessment to develop a PTSD score for an individual that identifies their risk of acquiring the condition.
Among the 70 data points are stress hormone levels, inflammatory signals, high blood pressure, and an anxiety-level assessment. Says Schultebraucks, "We selected measures that are routinely collected in the ED and logged in the electronic medical record, plus answers to a few short questions about the psychological stress response. The idea was to create a tool that would be universally available and would add little burden to ED personnel."
Researchers used data from adult trauma survivors in Atlanta, Georgia (377 individuals) and New York City (221 individuals) to test their system.
Of this cohort, 90 percent of those predicted to be at high risk developed long-lasting PTSD symptoms within a year of the initial traumatic event — just 5 percent of people who never developed PTSD symptoms had been erroneously identified as being at risk.
On the other side of the coin, 29 percent of individuals were 'false negatives," tagged by the algorithm as not being at risk of PTSD, but then developing symptoms.
Image source: Külli Kittus/Unsplash
Schultebraucks looks forward to more testing as the researchers continue to refine their algorithm and to instill confidence in the approach among ED clinicians: "Because previous models for predicting PTSD risk have not been validated in independent samples like our model, they haven't been adopted in clinical practice." She expects that, "Testing and validation of our model in larger samples will be necessary for the algorithm to be ready-to-use in the general population."
"Currently only 7% of level-1 trauma centers routinely screen for PTSD," notes Schultebraucks. "We hope that the algorithm will provide ED clinicians with a rapid, automatic readout that they could use for discharge planning and the prevention of PTSD." She envisions the algorithm being implemented in the future as a feature of electronic medical records.
The researchers also plan to test their algorithm at predicting PTSD in people whose traumatic experiences come in the form of health events such as heart attacks and strokes, as opposed to visits to the emergency department.
Vaccines find more success in development than any other kind of drug, but have been relatively neglected in recent decades.
Vaccines are more likely to get through clinical trials than any other type of drug — but have been given relatively little pharmaceutical industry support during the last two decades, according to a new study by MIT scholars.
A new study pushes back on psychiatry industry talking points.
- Australian researchers note a link between rising antidepressant usage and rising suicide rates in youth.
- Their research pushes back on psychiatry talking points that SSRIs decrease suicide risk.
- The top method for self-harm and suicide in younger age groups is overdosing antidepressants.
Antidepressants Can Cause Suicide and Homicide — Peter Gotzsche, M.D.<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="12a2ec455763e071d5fba7d9422d22b2"><iframe type="lazy-iframe" data-runner-src="https://www.youtube.com/embed/oIxcMIBhHS4?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span><p>Australia, which ranks second in the world in per-capita consumers of antidepressants among <a href="https://www.oecd.org/about/" target="_blank">OECD countries</a>, has never been provided the same safeguards as America—and the efficacy of America's safety measures are questionable at best. The FDA first issued that block box warning in 2004, updating it to reflect adults under age 25 three years later. In 2005, the Australian Therapeutic Goods Administration (TGA) required leaflets be included in antidepressant packages to reflect the risk of suicidal ideation.</p><p>The researchers write that the data put forward by psychiatrists and mental health organizations was misleading. Much like the industry ran with Rusk's assertion, many professionals cite a 2007 <a href="https://ajp.psychiatryonline.org/doi/full/10.1176/appi.ajp.2007.07030454" target="_blank">ecological study</a> by Robert D. Gibbons that incorrectly associates SSRI usage with a decreased risk of suicide among U.S. youth. This misreading is the basis of the narrative of minimized harm.</p><p>The data tells another story. The researchers point out that between 2008-2018, prescriptions for antidepressant (predominantly SSRIs) increased by 66 percent in the 0-27 year age group, while suicide rates increased by 49 percent in a similar age group (0-24 years). Between the years of 2006-2016, there was a 98 percent increase in intentional poisonings in New South Wales and Victoria. An overlap emerges: the most common method of attempted self-harm and suicide is prescription antidepressants. </p><p style="margin-left: 20px;">"There is clear evidence that more young Australians are taking antidepressants, and more young Australians are killing themselves and self-harming, often by intentionally overdosing on the very substances that are supposed to help them."</p><p>The researchers note that the FDA has long been criticized for not offering more non-pharmacological treatments. The cost of psychotherapy is prohibitive for many in the U.S. health care system. The reflex action of the medical establishment is to write a script. When one pill doesn't work or loses efficacy, it's usually replaced by another pill or added to an ever-growing pharmacological cocktail. Some people take four to six (or more) drugs to manage mental distress, each one countering the side effects of the other. </p>
Photo: Ryan McGuire / Pixabay<p>As in America, Australia suffers from corporate lobbying. The team writes that many opinion leaders receive funding from pharmaceutical companies; it makes sense that these figures will tout the benefits of antidepressants while downplaying potential harm. They also note that governing bodies are likely relying on outdated evidence of risk, which translates into a lack of consumer awareness.</p><p>They also write that general practitioners account for 90.4 percent of antidepressant prescriptions in Australia. Since mental health is not their area of expertise, they often repeat what psychiatrists initially prescribed.</p><p>Correlation is not causation, a limitation the researchers acknowledge. They list another cocktail, this one labelled "drivers of mental health distress." Smartphone addiction, online bullying, lack of meaningful relationships, climate change, and debt top the list. Antidepressants are not the cause of mental distress. What we need to know is whether they help alleviate it or add to the burden. </p><p>This forces us to confront a longstanding question: Why are we treating the symptoms of mental health problems with pills while never addressing their <a href="https://bigthink.com/mind-brain/antidepressants-dangers" target="_self">actual cause</a>? Put another way, why does the psychiatry industry rely on pills with a long list of <a href="https://bigthink.com/surprising-science/antidepressants-withdrawal" target="_self">side effects</a> instead of addressing the environmental and social issues that are at the foundation of mental distress? And why are we putting increasingly higher numbers of teenagers on drugs that <a href="https://www.health.harvard.edu/blog/anti-depressants-for-teens-201601229018" target="_blank">negatively impact their brains</a> while their prefrontal cortex is still in development? This seems to set them up for a lifetime of dependence, which is a great profit model but a terrible health care solution. </p><p>The psychiatry industry faced an existential crisis in the nineteen-seventies when the public grew weary of their growing reliance on drugs. The industry's response was to double down on pharmacology. Thanks for a massive PR campaign around Prozac, that move worked. You cannot both have <a href="https://www.health.harvard.edu/blog/astounding-increase-in-antidepressant-use-by-americans-201110203624" target="_blank">increasing numbers of prescriptions</a> and <a href="https://www.sciencedaily.com/releases/2019/03/190315110908.htm" target="_blank">increasing mental health problems</a> and pretend that this intervention is working. </p><p>While more work needs to be done, the researchers are confident in their assertion between increased self-harm with antidepressant usage. </p><p style="margin-left: 20px;">"These results are consistent with the hypothesis that antidepressants increase the risk of suicidality and self-harm in young people. Furthermore, they provide compelling evidence that the antidepressants prescribed to children and adolescents are frequently the means of self-harm."</p><p>These children deserve more from us at a pivotal time in their development. The psychiatry industry needs to come through this existential crisis with better solutions. </p><p><span></span>--</p><p><em>Stay in touch with Derek on <a href="http://www.twitter.com/derekberes" target="_blank">Twitter</a>, <a href="https://www.facebook.com/DerekBeresdotcom" target="_blank">Facebook</a> and <a href="https://derekberes.substack.com/" target="_blank">Substack</a>. His next book is</em> "<em>Hero's Dose: The Case For Psychedelics in Ritual and Therapy."</em></p>
The smart skin can "sweat" like human skin and also self-heal.
- Scientists have recently created a robotic skin that can be made to release stored liquid on demand.
- The skin could one day be used to apply medicine as needed to wounds or to keep surfaces at a precise level of dryness.
- More work is needed before it comes to a bandage near you.