Medicine and Health
A common anesthetic might work by making the brain go crazy
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In what ways do anesthetics keep us from seeing what’s going on around us? A new study that looks at the drug propofol suggests that some may knock us out by making the brain temporarily less stable.
The Greek words “an” (without) and “aesthesis” (sensation) are where the word “anesthesia” comes from. In medicine, anesthesia is a mix of paralysis (not being able to move), analgesia (not feeling pain), amnesia (losing your memory), and being unconscious. Chemicals have been used to put people in this state of mind, which has been very useful in medicine and has made many surgeries possible.
Sometimes, like when we’re awake or asleep, our brains go through different states. One way that these states are different is in how they handle sensory stimuli, which are changes in our brain state. For example, the sound of a phone notification sets off a chain reaction in your brain, where cells become more active and send signals to other cells. Depending on how you’re feeling, that same sound will have very different effects on your brain and how you feel. If you’re asleep, you might not hear it at all. Or while under anesthesia.
How does our brain react to sensory stimuli when we are asleep, and why can’t we be aware of them? A study released today looked at the differences between a brain that is awake and one that is asleep by looking at how stable the brain’s activity is.
To find out how stable something was, they used ideas from a branch of math called dynamical systems theory. Stability is the ability of a system to get back to a normal state after something goes wrong. A stable system is like a pendulum with friction: you can move it from one place to another when you drop it, but it will always land in the same place.
A weather system is an example of an unstable system because small changes can have big effects over time. This is often compared to a butterfly flapping its wings, which can cause a tornado.
“The brain has to handle being on the edge of chaos and excitability.” If it gets too excited, its neurons stop talking to each other, but if it gets just the right amount of excited, it goes into chaos,” Professor Earl Miller, one of the study’s senior authors, said in a press release. He was talking about how stability can be used to measure the brain’s state.
Researchers in the study took recordings from the brains of two macaques while they were given propofol, which is an injectable anesthetic that is often used in surgery. When the primates were more deeply asleep, the activity in their brains became less stable.
For the awake brain to stay stable, there needs to be a balance between stimulating and slowing down. There are two main types of neurons in the brain: those that make other neurons more active (called “excitatory”) and those that make them less active (called “inhibitory”). Propofol works on the inhibitory system to make it stronger and throw the system out of balance.
When the macaques were asleep, the researchers played sounds for them and found that the brain responses were slower and longer. The sensory stimulation caused the system’s state to change for a long time. This shaky activity could mean that the brain can’t handle information as well as it used to. This could be why, when we’re asleep, we can’t see or feel our surroundings or feel pain.
Doctor Ila Fiete, who was also a senior author on the study, said that this new way of describing brain states by looking at how stable they are could be used to study “different brain states, different types of anesthetics, and also other neuropsychiatric conditions like depression and schizophrenia.”
This piece appears in the journal Neuron.
Medicine and Health
A recently identified strain of deadly fungus poses a significant risk to public health
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Researchers have recently discovered a new group of Candida auris, a potentially dangerous pathogen. The finding increases the total number of identified clades of the fungus, which is a newly emerging superbug resistant to multiple drugs, to six.
Candida auris is a strain of yeast that has the potential to cause serious illness and is frequently impervious to antifungal drugs. While individuals who are in good health generally do not fall ill, the transmission of the disease is highly prevalent within medical institutions and poses a significant risk to individuals with compromised immune systems. The yeast can induce a variety of conditions ranging from superficial infections of the skin to more severe and life-threatening illnesses, such as bloodstream infections. Due to its high level of resistance to multiple drugs, treating it can be challenging, and in some cases, even impossible.
The authors state that the pathogen is a significant global public health threat due to its widespread distribution, resistance to multiple drugs, high ability to spread, tendency to cause outbreaks, and high mortality rate. Although infections are still relatively uncommon, there has been a significant increase in cases in recent years.
Previously, the fungus had been categorized into five distinct clades, each located in different geographic regions: South Asia, East Asia, Africa, South America, and Iran.
In April 2023, doctors from the Singapore General Hospital identified a patient carrying a unique strain of C. auris as part of a routine screening program, adding it as the most recent clade to be discovered. Typically, these cases arise from individuals who have recently traveled, but this particular patient had not traveled outside the country for a period of two years, which raised some concerns.
Upon conducting a genetic analysis of the strain, the researchers determined that it did not align with any of the five known clades of the fungus. Therefore, it can be concluded that the strain belongs to a previously unidentified, sixth clade. Subsequently, they conducted tests on strains obtained from previous patients and identified two additional isolates of this particular group of C. auris in Singapore, as well as another isolate in Bangladesh.
The extent of the new clade’s prevalence and its potential to cause invasive infections and outbreaks remains uncertain at present. However, the researchers emphasize the importance of promptly identifying and controlling it in order to safeguard patient well-being.
“The ramifications of this breakthrough transcend the confines of the laboratory.” “Given the recent discovery of the sixth Candida auris clade, it is imperative to enhance surveillance capability or create new methods to strengthen existing surveillance strategies. This will enable health care facilities to closely monitor its emergence and effectively control its spread,” stated Dr. Karrie Ko, co-first author of the study.
Fortunately, the cases described in the study remained vulnerable to all antifungals that were tested. This should alleviate concerns about a pandemic similar to the one depicted in The Last Of Us. However, it is evident that the threat of C. auris is persistent. Therefore, additional efforts are required to identify new strains, monitor their spread, and control any negative clinical consequences.
The research is published in The Lancet Microbe journal.
Medicine and Health
What makes your chest hurt when something makes you jump?
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Have you ever been scared so badly that you grabbed your chest? You feel like someone or something just zapped you behind the sternum. As you rest, you lean against the wall and think about why your friend is such a jerk and why you can feel it in your chest whenever you get scared.
People often use words like “heart-stopping” when they write fiction about fear, but the science of fear tells us that this isn’t what’s happening because it wouldn’t make sense. Our bodies are getting ready to deal with an impending threat when we’re scared, and going into cardiac arrest wouldn’t help us get very far if a lion was after us.
What do we do when we’re scared?
The sympathetic nervous system is what gets you excited when something makes you jump. It’s a tool inside our bodies that releases hormones and changes the way our bodies work to get us ready for the fight-or-flight response.
One important part is adrenaline, which is also known as epinephrine. The adrenal glands squeeze it out into the blood. The heart starts beating faster, sending more blood to your muscles and organs right away. Because they need all the oxygen they can get if they want to get away from a dangerous animal.
How do you feel when you go for a run?
Anyone who has ever used an EpiPen knows how bad it is to feel a sudden rush of adrenaline. It’s a stress hormone that makes you feel nervous and anxious, like you would before doing a bungee jump. Getting a rush when you think about a traumatic event from the past can be a sign of PTSD.
A medicine called adrenaline is used because it can help people who are having a medical emergency. If you have anaphylaxis from an allergen like peanuts, this can help because it can open your airway. Because it changes the strength and speed of heartbeats, it is also sometimes used to help people who are having a cardiac arrest.
When your adrenaline level goes up quickly, you may feel shaky, your heart beat quickly, and your chest get tight. When you add in the fact that you’re more alert, you become very aware of the changes in your body. This is especially clear when you’re not in danger, like when your partner surprised you at home when you thought you were alone.
When you’re scared, your sympathetic nervous system usually kicks in, which is normal. But, some heart conditions can get worse when you’re scared. Should anyone be having chest pain or ongoing discomfort, they should see a doctor. In the end, it is possible to be so scared that you die.
This article is not meant to be a replacement for medical advice, diagnosis, or treatment from a trained professional. If you have questions about a medical condition, you should always talk to a qualified health professional.
Medicine and Health
The Lacks family is suing again over her “stolen” cells
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The family of Henrietta Lacks has filed a new lawsuit against two sizable drug companies for using her genetic material without her consent.
In the US District Court for the District of Maryland, Lacks’ living relatives are suing Novartis Pharmaceuticals Corporation, Novartis Gene Therapies, Inc., Viatris, Inc., and its subsidiary, Mylan Pharmaceuticals. They say the companies have used the “stolen” HeLa cell line to make hundreds of patents and have made a lot of money from it.
The suit wants the money made from using these cells to be “rightfully transferred” to Henrietta Lacks’s estate.
Novartis and Viatris chose to sell Henrietta Lacks’ living genetic material. Lacks was a black grandmother, community leader, and woman whose doctors took her tissue without her knowledge or permission, according to Chris Ayers, an attorney at Seeger Weiss LLP who is representing the Lacks family.
Ayers added, “We will keep looking for justice for Mrs. Lacks and her family.”
Henrietta Lacks died on October 4, 1951, from cervical cancer. She was 31 years old. Some of her cells are still alive today. A doctor at Johns Hopkins Hospital took a sample of her cervical cells without her knowledge just before she died. They were doing a cancer check. It was seen that her cells kept multiplying quickly, even after most of the cells in other samples would have died without their host.
Because scientists saw the potential, they found that these cells could be a cheap and easy way to help researchers do more research. The “HeLa immortal cell line” is what scientists call these cells, and they are very useful for biomedical research.
Over 75,000 scientific studies around the world have used these cells, which amount to about 55 million tons. They have been very important in making progress in areas like polio vaccines, cancer treatments, HIV/AIDS treatments, and much more.
All of this was done, though, without Lacks’ knowledge or permission. For many years, her family also didn’t know that the cells were being used for business.
Selling HeLa cells for money brings up important issues in medical ethics and genetics. As a black woman living in America in the 1950s, Lacks’ case shows how medical racism still affects minorities who aren’t getting enough help.
Even though a lot of people know about these problems, HeLa cells are still used in medical research for profit, which makes some companies a lot of money.
“Now that everyone knows Henrietta Lacks’ story, it’s shocking, but not surprising, that drug companies like Novartis and Viatris are still making money off of the deeply unethical origins of HeLa cells and the disturbing history of medical racism,” said Chris Seeger, another lawyer for the family.
A historic deal was made by Lacks’ family in 2023 after they sued Thermo Fisher Scientific, Inc., another biotech company, in the US District Court for the District of Baltimore. During that time, the lawyers said that the settlement was only the beginning and that there could be many more lawsuits about the use of HeLa cells.
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