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Yesterday β€” 30 January 2025Main stream

Stem cells used to partially repair damaged hearts

29 January 2025 at 22:27

When we developed the ability to convert various cells into a stem cell, it held the promise of an entirely new type of therapy. Rather than getting the body to try to fix itself with its cells or deal with the complications of organ transplants, we could convert a few adult cells to stem cells and induce them to form any tissue in the body. We could potentially repair or replace tissues with an effectively infinite supply of a patient's own cells.

Although the Nobel Prize for induced stem cells was handed out over a decade ago, the therapies have been slow to follow. In a new paper published in the journal Nature, however, a group of German researchers is now describing tests in primates of a method of repairing the heart using new muscle generated from stem cells. Although they're not yet providing everything that we might hope for, the results are promising. And they've been enough to start clinical trials, with similar results being seen in humans.

Heart problems

The heart contains a lot of specialized tissues, including those that form blood vessels or specialize in conducting electrical signals. But the key to the heart is a form of specialized muscle cell, called a cardiomyocyte. Once the heart matures, the cardiomyocytes stop dividing, meaning that you end up with a fixed population. Any damage to the heart due to injury or infection does not get repaired, meaning damage will be cumulative.

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Β© Douglas B. Cowan and James D. McCully

Before yesterdayMain stream

It’s remarkably easy to inject new medical misinformation into LLMs

8 January 2025 at 22:58

It's pretty easy to see the problem here: The Internet is brimming with misinformation, and most large language models are trained on a massive body of text obtained from the Internet.

Ideally, having substantially higher volumes of accurate information might overwhelm the lies. But is that really the case? A new study by researchers at New York University examines how much medical information can be included in a large language model (LLM) training set before it spits out inaccurate answers. While the study doesn't identify a lower bound, it does show that by the time misinformation accounts for 0.001 percent of the training data, the resulting LLM is compromised.

While the paper is focused on the intentional "poisoning" of an LLM during training, it also has implications for the body of misinformation that's already online and part of the training set for existing LLMs, as well as the persistence of out-of-date information in validated medical databases.

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US to start nationwide testing for H5N1 flu virus in milk supply

6 December 2024 at 21:18

On Friday, the US Department of Agriculture (USDA) announced that it would begin a nationwide testing program for the presence of the H5N1 flu virus, also known as the bird flu. Testing will focus on pre-pasteurized milk at dairy processing facilities (pasteurization inactivates the virus), but the order that's launching the program will require anybody involved with milk production before then to provide samples to the USDA on request. That includes "any entity responsible for a dairy farm, bulk milk transporter, bulk milk transfer station, or dairy processing facility."

The ultimate goal is to identify individual herds where the virus is circulating and use the agency's existing powers to do contact tracing and restrict the movement of cattle, with the ultimate goal of eliminating the virus from US herds.

A bovine disease vector

At the time of publication, the CDC had identified 58 cases of humans infected by the H5N1 flu virus, over half of them in California. All but two have come about due to contact with agriculture, either cattle (35 cases) or poultry (21). The virus's genetic material has appeared in the milk supply and, although pasteurization should eliminate any intact infectious virus, raw milk is notable for not undergoing pasteurization, which has led to at least one recall when the virus made its way into raw milk. And we know the virus can spread to other species if they drink milk from infected cows.

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Β© Credit: mikedabell

Breakdancers at risk for β€œheadspin hole,” doctors warn

10 October 2024 at 22:30

Breakdancing has become a global phenomenon since it first emerged in the 1970s, even making its debut as an official event at this year's Summer Olympics. But hardcore breakers are prone to injury (sprains, strains, tendonitis), including a bizarre condition known as "headspin hole" or "breakdance bulge"β€”a protruding lump on the scalp caused by repeatedly performing the power move known as a headspin. A new paper published in the British Medical Journal (BMJ) describes one such case that required surgery to redress.

According to the authors, there are very few published papers about the phenomenon; they cite two in particular. A 2009 German study of 106 breakdancers found that 60.4 percent of them experienced overuse injuries to the scalp because of headspins, with 31.1 percent of those cases reporting hair loss, 23.6 percent developing head bumps, and 36.8 percent experiencing scalp inflammation. A 2023 study of 142 breakdancers reported those who practiced headspins more than three times a week were much more likely to suffer hair loss.

So when a male breakdancer in his early 30s sought treatment for a pronounced bump on top of his head, Mikkal Bundgaard Skotting and Christian Baastrup SΓΈndergaard of Copenhagen University Hospital in Denmark seized the opportunity to describe the clinical case study in detail, taking an MRI, surgically removing the growth, and analyzing the removed mass.

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Senate panel votes 20–0 for holding CEO of β€œhealth care terrorists” in contempt

By: Beth Mole
20 September 2024 at 17:42
Ralph de la Torre, founder and chief executive officer of Steward Health Care System LLC, speaks during a summit in New York on Tuesday, Oct. 25, 2016.

Enlarge / Ralph de la Torre, founder and chief executive officer of Steward Health Care System LLC, speaks during a summit in New York on Tuesday, Oct. 25, 2016. (credit: Getty | )

A Senate committee on Thursday voted overwhelmingly to hold the wealthy CEO of a failed hospital chain in civil and criminal contempt for rejecting a rare subpoena from the lawmakers.

In July, the Senate Committee on Health, Education, Labor, and Pensions (HELP) subpoenaed Steward Health Care CEO Ralph de la Torre to testify before the lawmakers on the deterioration and eventual bankruptcy of the system, which included more than 30 hospitals across eight states. The resulting dire conditions in the hospitals, described as providing "third-world medicine," allegedly led to the deaths of at least 15 patients and imperiled more than 2,000 others.

The committee, chaired by Senator Bernie Sanders (I-Vt.), highlighted that amid the system's collapse, de la Torre was paid at least $250 million, bought a $40 million yacht, and owned a $15 million luxury fishing boat. Meanwhile, Steward executives jetted around on two private jets collectively worth $95 million.

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Parenting nightmare: Kiss on the cheek causes child’s incurable infection

By: Beth Mole
5 September 2024 at 19:47
Herpes simplex virus, (HSV). Image taken with transmission electron microscopy.

Enlarge / Herpes simplex virus, (HSV). Image taken with transmission electron microscopy. (credit: Getty | BSIP)

As the US Surgeon General recently highlighted, parenting is stressful. From navigating social media to facing a youth mental health crisis, challenges abound. But, for one father in Spain, even the simple, loving, everyday act of giving your child a peck on the cheek has turned to nightmare fuel.

According to a case report in the New England Journal of Medicine, the man's 9-year-old daughter developed a fever along with a crusty, blistering lesion on her left cheek. Doctors initially diagnosed the blotch as impetigo, a bacterial infection on the skin's surface layers that is fairly common in children. It's often caused by Staphylococcus aureus or Streptococcus bacteria and is generally easily treated with antibiotics.

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Exploring Science and Technology Advancements: Transforming Our World

3 September 2024 at 07:41

The field of science and technology is continually evolving, driving significant advancements that shape our world and improve our quality of life. These innovations span various domains, including healthcare, communication, transportation, and environmental sustainability. As an expert in Science and Education, I will delve into some of the most impactful recent advancements in science and…

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Passing part of a medical licensing exam doesn’t make ChatGPT a good doctor

16 August 2024 at 14:43
Smiling doctor discussing medical results with a woman.

Enlarge / For now, "you should see a doctor" remains good advice.

ChatGPT was able to pass some of the United States Medical Licensing Exam (USMLE) tests in a study done in 2022. This year, a team of Canadian medical professionals checked to see if it’s any good at actual doctoring. And it’s not.

ChatGPT vs. Medscape

β€œOur source for medical questions was the Medscape questions bank,” said Amrit Kirpalani, a medical educator at the Western University in Ontario, Canada, who led the new research into ChatGPT’s performance as a diagnostic tool. The USMLE contained mostly multiple-choice test questions; Medscape has full medical cases based on real-world patients, complete with physical examination findings, laboratory test results, and so on.

The idea behind it is to make those cases challenging for medical practitioners due to complications like multiple comorbidities, where two or more diseases are present at the same time, and various diagnostic dilemmas that make the correct answers less obvious. Kirpalani’s team turned 150 of those Medscape cases into prompts that ChatGPT could understand and process.

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Path to precision: Targeted cancer drugs go from table to trials to bedside

By: Beth Mole
5 August 2024 at 11:00
Path to precision: Targeted cancer drugs go from table to trials to bedside

Enlarge (credit: Aurich Lawson)

In 1972, Janet Rowley sat at her dining room table and cut tiny chromosomes from photographs she had taken in her laboratory. One by one, she snipped out the small figures her children teasingly called paper dolls. She then carefully laid them out in 23 matching pairsβ€”and warned her kids not to sneeze.

The physician-scientist had just mastered a new chromosome-staining technique in a year-long sabbatical at Oxford. But it was in the dining room of her Chicago home where she made the discovery that would dramatically alter the course of cancer research.

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Integrative Medicine: A Holistic Approach to Health and Wellness

31 July 2024 at 08:56

Integrative medicine is an innovative approach that combines conventional medical treatments with complementary therapies to address the physical, emotional, mental, social, and spiritual aspects of health. As an expert in Health & Wellness, this article explores the principles and benefits of integrative medicine, providing a comprehensive understanding of how this approach can enhance overall…

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Embracing Natural Remedies for Health and Wellness

10 July 2024 at 08:34

Natural remedies have been used for centuries to promote health and wellness, offering a holistic approach to treating various ailments. These remedies leverage the healing properties of plants, herbs, and other natural substances to support the body’s ability to heal itself. As an expert in Health & Wellness, I will provide a comprehensive guide to natural remedies, exploring their benefits…

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Many stunt performers are reluctant to report head injuries, study finds

Ryan Gosling in <em>The Fall Guy</em>.

Enlarge / Ryan Gosling in The Fall Guy. (credit: Universal Pictures)

Ryan Gosling plays a Hollywood stuntman in the new action comedy The Fall Guy, a loose adaptation of the popular 1980s TV series of the same name starring Lee Majors. Gosling even did a few of his own stunts, although professional stunt performers handled the most dangerous sequences. It's their job to assume the risk so the stars don't get injured but that can translate into a high rate of head injuries in particular. According to a study published in the Journal of Occupational Medicine and Toxicology, a significant fraction of stunt performers never report such injuries, largely because it's a competitive industry, and they are afraid of losing work. The impacts can lead to more serious cognitive issues later in life.

β€œMany stunt performers are afraid to report their injuries, especially head trauma, in fear they will be put on a do-not-hire list or looked at as a liability,” said co-author Jeffrey Russell of Ohio University. β€œThe more injuries or trauma, the harder it may be to find work. But that should not be how it is; production companies and their unions should be ensuring stunt performers are taken care of and not reprimanded for any injuries sustained on the job.”

The work builds on Russell's prior research, published last year, looking at the prevalence of head trauma and concussion in stunt performers and how well such injuries are managed. The prevalence of such injuries means that stunt performers are at high risk for chronic traumatic encephalopathy (CTE)β€”a degenerative brain disease associated with a history of repetitive head impacts that is a cause of much concern in collision sports like football and ice hockeyβ€”over the course of their careers.

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IV infusion enables editing of the cystic fibrosis gene in lung stem cells

13 June 2024 at 21:53
Abstract drawing of a pair of human hands using scissors to cut a DNA strand, with a number of human organs in the background.

Enlarge (credit: DrAfter123)

The development of gene editing tools, which enable the specific targeting and correction of mutations, hold the promise of allowing us to correct those mutations that cause genetic diseases. However, the technology has been around for a while nowβ€”two researchers were critical to its development in 2020β€”and there have been only a few cases where gene editing has been used to target diseases.

One of the reasons for that is the challenge of targeting specific cells in a living organism. Many genetic diseases affect only a specific cell type, such as red blood cells in sickle-cell anemia, or specific tissue. Ideally, to limit potential side effects, we'd like to ensure that enough of the editing takes place in the affected tissue to have an impact, while minimizing editing elsewhere to limit side effects. But our ability to do so has been limited. Plus, a lot of the cells affected by genetic diseases are mature and have stopped dividing. So, we either need to repeat the gene editing treatments indefinitely or find a way to target the stem cell population that produces the mature cells.

On Thursday, a US-based research team said that they've done gene editing experiments that targeted a high-profile genetic disease: cystic fibrosis. Their technique largely targets the tissue most affected by the disease (the lung), and occurs in the stem cell populations that produce mature lung cells, ensuring that the effect is stable.

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Ancient Egyptian skull shows evidence of cancer, surgical treatment

Skull and mandible 236, dating from between 2687 and 2345 BCE, belonged to a male individual aged 30 to 35.

Enlarge (credit: Tondini, Isidro, CamarΓ³s, 2024.)

The 4,000-year-old skull and mandible of an Egyptian man show signs of cancerous lesions and tool marks, according to a recent paper published in the journal Frontiers in Medicine. Those marks could be signs that someone tried to operate on the man shortly before his death or performed the ancient Egyptian equivalent of an autopsy to learn more about the cancer after death.

β€œThis finding is unique evidence of how ancient Egyptian medicine would have tried to deal with or explore cancer more than 4,000 years ago,” said co-author Edgard CamarΓ³s, a paleopathologist at the University of Santiago de Compostela. β€œThis is an extraordinary new perspective in our understanding of the history of medicine.”

Archaeologists have found evidence of various examples of primitive surgery dating back several thousand years. For instance, in 2022, archaeologists excavated a 5,300-year-old skull of an elderly woman (about 65 years old) from a Spanish tomb. They determined that seven cut marks near the left ear canal were strong evidence of a primitive surgical procedure to treat a middle ear infection. The team also identified a flint blade that may have been used as a cauterizing tool. By the 17th century, this was a fairly common procedure to treat acute ear infections, and skulls showing evidence of a mastoidectomy have been found in Croatia (11th century), Italy (18th and 19th centuries), and Copenhagen (19th or early 20th century).

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Exploring Alternative Medicine: A Path to Holistic Health

7 May 2024 at 16:16

Alternative medicine offers a unique approach to healing that complements traditional medical practices, focusing on improving overall well-being and treating the whole person rather than just the symptoms. As an expert in Health & Wellness, this article delves into the various aspects of alternative medicine, shedding light on its benefits and integration into daily health routines.

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