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views:6955
00:01:54
04/01/2011
Robotic Mitral Valve Repair Surgery
Unlike traditional mitral valve repair surgery in which the sternum is cut and spread open, in a minimally invasive robotic mitral valve procedure, th
e surgeon manipulates a highly advanced robotic tool and makes only tiny incisions. The robotic arms are inserted through the side of the chest, which is even closer to the heart than opening the sternum. Keyhole incisions are made for the surgical arms, camera and access tube. The tiny camera provides a view of the diseased valve. If the valve is oversized, misshapen or doesn't close properly, which allows blood to leak backwards, the misshapen portion of the valve is removed and reconstructed with sutures. An artificial ring is inserted to reduce its size. The ring is then sewn into place, thus the valve closes properly and so, blood no longer leaks back.
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Keywords:mitral valve surgery, mitral valve prolapsed, mitral valve regurgitation, mitral valve stenosis, University of Chicago, valvular heart surgery, Valluvan Jeevanandam, valve surgery, minimally invasive valve surgery, mitral valve repair, heart valve surgery, robotic valve surgery
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views:9217
00:02:14
16/12/2010
Dizzy Chair: Curing Vertigo
Patients with vertigo and dizziness typically have a problem with their inner ear. With vertigo, the patient has a feeling of motion, even if they are
stationary – the room or landscape appears to turn around all the time. This is a chronic condition which does not go away.
There are several different causes of vertigo. When a patient suffers from "peripheral", "otologic" or "vestibular" vertigo, the crystals lining the inner ear are loose. Within the inner ear lie collections of calcium crystals known as otoconia. In these patients, the otoconia are dislodged from their usual position and migrate over time into one of the semicircular canals. All our balance is controlled by these two gyroscopes, the three little semi-circular canals in the ear.
A patient suffering from this type of vertigo is placed into a rotation chair, called an Epley Chair. The chair rotates the patient in a variety of degrees until the loose crystals are rolled back into place. The treatments take about a couple of hours.
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Keywords:vertigo, Epley Chair, ian Purcell, michael o'leary, dizzy, dizzy chair, alvarado hospital, senta clinic, vision
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views:7569
00:10:12
01/12/2010
Left vs. Right Brain
Joe was a man who had suffered from epileptic seizures two or three times a day for many years. In order to prevent these seizures, Dr. Mike Gazzaniga
severed the right side of the brain from the left side, by cutting the corpus callosum that connected the two brains. This put an end to the seizures, but also prevented the left and right halves of his brain from communicating with each other. Now, Joe’s left and right brains think independently.
The left side of the brain typically controls the right side of the body, and the right side of the brain controls the left side of the body. Motor messages from one can confuse the other, if they try to work simultaneously.
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Keywords:split-brain, corpus callosum, Mike Gazzaniga
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views:11413
00:01:06
03/10/2010
Why Aren't Chimps Still Evolving Into Humans?
This is a question that many people ask. If we evolved from chimpanzees, why aren’t the chimpanzees extinct?
That’s not an accurate question, b
ecause chimpanzees did not evolve into humans. Human beings are cousins of chimpanzees, not descendants from them.
We and they go back to a common ancestor. That common ancestor was not a chimpanzee or a human. That common ancestor evolved in two different directions – one into a chimpanzee, the other into a human.
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Keywords:chimpanzee, humans, evolution, Richard Dawkins, theory of evolution, Charles Darwin
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views:11338
00:04:36
21/07/2010
Megaflora Trees
Ray Allen is a pioneer in the field of bio-energy. It is his goal to plant the MegaFlora tree worldwide. The MegaFlora tree is also known as the HDSR
tree – high density, short rotation. It has high density because it has a high yield of lumber and biomass per acre, for fuel and other energy uses. Short rotation, because developers say it can grow to its full size – 60 feet tall, in just three years.
Unlike a traditional tree, the megaflora tree re-grows from its stump after harvest. It also produces no fruit or fertile seeds, so it is non-invasive. Every other biomass has to be replanted. The megaflora tree only needs to be planted once.
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Keywords:megaflora tree, ethanol, switchgrass, renewable energy, billy barnwell, john chapman, ray allen, biofuel, crossbreed, hdsr, high density short rotation, Emerald Energy
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views:6990
00:03:17
27/06/2010
Dealing with Stress
Stress can kill. It works silently and invisibly, eroding our minds and bodies. This is ironic, since stress evolved to help us survive. Sudden danger
triggers the release of hormones that rev the body up for a life or death struggle, or a frantic escape from danger. This adrenalin rush can be addictive. But when this adrenalin is constantly flowing, it actually harms the body.
Today, people no longer need be concerned about predators, but rather about work, their relationships, their money and their health. Over an extended period of time, these stress hormones can cripple the immune system and put harmful pressure on the heart – leading to a heart attack or stroke. In order to deal with stress, a variety of techniques are used, including meditation.
Part 2: http://www.youtube.com/watch?v=fm9Ge-RXg_U
Part 3: http://www.youtube.com/watch?v=KiHHRXQ4vm4
Part 4: http://www.youtube.com/watch?v=kqmbvjGVphQ
Part 5: http://www.youtube.com/watch?v=Lkp-APFAu9k
Part 6: http://www.youtube.com/watch?v=hLtd3IWyU4U
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Keywords:stress, meditation, adrenalin rush, stress related diseases, relaxation
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views:5753
00:02:34
22/06/2010
Drugs Factory
Modern drug discovery relies more on calculated gamble than on careful design. At GSK, a company in England, they have a library of over 2 million nam
eless chemical compounds. Scientists know very little about them. They could be highly toxic or they could be harboring a life-saving drug.
A known disease molecule – the target – is introduced to each of the 2 million compounds, one by one, to see if anything happens. With these 2 million or so compounds, they might get a few that are active against that target – as little as one or two. Chemists will then make hundreds or thousands of samples related to that original structure to try to improve that activity.
The samples must be screened over and over again. Just a handful will make it through to be tested on people. The cost in research to find a single drug is over one billion dollars and requires thousands of tests, over a period of fourteen years.
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Keywords:GSK, modern drug discovery
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views:5483
00:05:44
15/06/2010
From Molecule to Medicine
The human body is extremely vulnerable – many illnesses and disorders are still untreatable. However, science is always evolving in its efforts to fin
d drugs to help patients all over the world.
14 years is the length of time it takes to develop a new drug. Over this time period, 100 research projects lead to one drug being introduced to the market.
In many illnesses, one or more proteins in the body are not working correctly. Scientists are trying to discover which proteins cause an illness, and if any drugs can be developed to correct them. Our bodies, however, contain hundreds of thousands of different proteins. Finding a single protein that isn’t working properly is a long, labor intensive process.
In modern labs, with advanced technology, up to 100,000 substances can be tested a day.
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Keywords:PhRMA, pharmaceutical industry, drug discovery, molecule, medicine
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views:5577
00:05:22
24/05/2010
Pushing the Limits of Healing
The human body has a remarkable ability to heal itself. However, in some situations, no amount of time or healing can help restore full function. For
example, individuals with severed spinal cords can not be helped to walk again, at the present time. However, such individuals find that the body never gives up trying to repair itself. A few muscles will strengthen as time goes on.
Helped by medicine, surgery or biotechnology, people with such injuries might one day be healed totally. The goal is to repair our bodies indefinitely, to prolong life as long as possible.
Part 2: http://www.youtube.com/watch?v=kydr1KdgnTg
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Keywords:medicine, medical breakthroughs, medical history, DNA, nanotechnology, Biotechnology, bacteria, Penny Roberts, spinal cord surgery
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views:5244
00:09:57
23/05/2010
Diets From Hell
At any one time, one in four people in Britain are on a diet. There are more fat people in Britain than anywhere else in Europe. This is despite the f
act that the UK spends about 18 million pounds a year on slimming products. And this is despite the fact that by the time they reach an age of 18, eight out of ten women in the UK have been on at least two diets.
Many women are serial dieters – they will try any slimming product that comes on the market, no matter how much it costs, in the hopes that it will help them to lose weight. And yet no matter how much they weigh, they will never be happy with how they look. Thus, they will never stop dieting. Dieting takes over their lives.
Part 2: http://www.youtube.com/watch?v=UOllhcPTu6I
Part 3: http://www.youtube.com/watch?v=Vt-fFBw8J3c
Part 4: http://www.youtube.com/watch?v=kCG5EoQLVUk
Part 5: http://www.youtube.com/watch?v=ghMV9FR2qac
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Keywords:low carb, Marc Sage, vegan, vegetarian, cooking, health, diet
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