MRI has become an important tool to diagnose varied in nature and is therefore of great importance to medical science. MRI but unfortunately at improper preparation and in certain situations is dangerous. Claustrophobia can occur, metal in the body can lead to bleeding and burns and the ignorance of doctors, together with the immense noise of MRI can be the start of a very serious ear disorders such as tinnitus and hyperacusis.
How MRI Works
Magnetic resonance imaging (magnetic resonance imaging) is the latest development to date within the radio diagnostics. The operation here is not based on X-rays, but with magnetic fields and short radio waves. Briefly put computer signals, which are transmitted in response to the magnetic effect to contrast material. The result is a cross-section of the body part of which highly detailed three-dimensional reconstructions of organs and tissues can be made. The technique is very precise, and the procedure is particularly useful as a soft tissue to be examined, something that is not possible with x-ray. The research is particularly suitable for imaging the brains, organs, nerves, muscles, tendons, blood vessels, and spinal joints. The following diseases can be detected: tumors, cancer, MS, infections of the brain, stroke and other brain diseases.
The implementation of an MRI is as follows: You will lie on a narrow table and gets a head, then you will be pushed a large narrow cylinder. This tunnel is the magnet itself. The idea is that you keep lying. As quiet as possible the technician will leave the room during the whole procedure, but will keep in touch with you. If you wish to continue proceedings prematurely then you can press the alarm button that you got in your hands. In this case, the machine will stop and you will be instantly removed from the device.
MRI provides droning, metallic sounds that far exceed 100 decibels, which makes the procedure at best only unpleasant and at worst unbearable. The patient is supposed to get. Earplugs and / or headphones with music However, this is different to examine the body. Per hospital per In image is to be placed depends on what part of the body takes an MRI scan between 10 minutes and one hour.
MRI cannot be performed when there is metal in and around the body because the strong magnetic attraction to metal. Examples are:
- Internal metal such as pacemaker, artificial heart valves, vascular clips, aneurysm clips, cochlear implants and other electronic and metal implants, metal particles in the eye, shrapnel in the body, subcutaneous insulin, orthopedic prostheses, screws and pins, artificial joints, neurostimulators, IUD.
- Decorations and clothing such as: jewelry, watches, piercings, belt, buckle, zipper, metal bracket in bra, hair pins, shoes, some tattoos, makeup and hairspray.
- Personal belongings such as pens, pencils, lighters, keys, money, wallet, pocket knives, magnetic cards such as debit cards, parking, credit card, etc.
- Medical devices such as hearing aids, dentures, eyeglasses.
Dangers and disadvantages of MRI
A major disadvantage of MRI is that many people can undergo through all kinds of circumstances and not simply that the side effects can be dramatic, even though the doctors say it is a completely safe procedure. Below are examples of possible consequences.
It is estimated that 10% of people claustrophobic and for that reason to panic gets into the narrow tunnel. The MRI-tube, in which the patient is situated, is very narrow, and the body is in most cases, depending on the type of research, completely surrounded by the cavity walls. On very rare occasions, a mirror suspended so that a piece chamber is visible, but more often this is not the case and the patient continues to have sensation in the back of only a kind of “coffin”. In other cases, the eyes are covered with a washcloth to reduce the “trapped” feeling, but it can also have the opposite effect correctly. The alarm button that holds the patient may be depressed, but this means that after about a new large piece of the procedure or the whole study should be abandoned. Whether you’re claustrophobic i.e. claustrophobia you often only know once you are in the machine, but an indication of this is available if you feel uncomfortable while you’re on your own in an unknown state elevator. If you know that feeling you can unfortunately expect difficulties in MRI. To counter the fear, you can advance a sedative occupy.
Hyperacusis and tinnitus
The current MRIs produce as many decibels as a jackhammer and a house-thump together. The immense noise is serialized at you and takes minutes at a time, and this short distance from your ears. Imagine the noise of pile driving for, like someone fucking hard swinging a sledgehammer against a metal pipe. Doctors are in most cases unaware of the serious effects that the noise of MRI scans on people can have. Patients with unknown problems, e.g. starting tinnitus, sensation in the ears and hypersensitivity to sound expose themselves to risks that they should actually be protected and also healthy ears can have serious consequences.
MRI technicians are intended to be provided, ranging from a headset to ear plugs, ear but this occurs far from a severe noise trauma, provided the patient is sensitive to. In some cases, there is not even given ear protection. Conditions that may result from noise trauma the consequences hyperacusis, hypersensitivity to normal sounds, i.e. tinnitus and tinnitus. Both disorders can develop into incompatible with life situations.
If MRI is absolutely necessary for patients with hearing problems than would be a special hearing test should be carried out which measures the LDL of the patient. At the first place LDL stands for ‘loudness discomfort level “and gives a frequency where the tolerance is sound. This is in healthy ears around the 100 db, but may be at any otic disorder drop to much lower values, which MRI is impossible. If, however MRI is performed under these conditions will lead to a further decrease this limit causing an initially present but mild hyperacusis degenerates into an intolerable situation that in absolutely cannot tolerate normal sounds around us.
Also tinnitus may arise or severely worsen after an MRI examination. You are always there, even by otolaryngologists, you’re out not to be in a loud environment, but too long for MRI seems that rule not to go, and you are exposed to an incredible uproar in a hollow space; a risk in many cases is taken. Inaccurately.
May become distorted after MRI in significant ways. Functioning of the ears and the brains sometimes a patient after MRI dizziness and balance disorders that can persist for months, there are also reports of patients who for week’s nightmares, memory loss and concentration reporting after undergoing an MRI as hell were experienced. What MRI in the long term causes harm to both brain and other body parts is not clear yet?
Risks in metal
The magnetic force of the solid MRI machine is so strong that even the weakest machine of about 0.5 tesla is 10,000 times stronger than the strength of the magnetic field of the earth. What happens if someone still metal enters the scanner by mistake? The metal in the human body moves, the equipment, such as the pacemaker, is abruptly inoperative. In America, people have died because they have a pacemaker underwent the test and it immediately became inoperative. In addition, there may be internal bleeding, and eventually to death, for example by the shifting of internal clips as they are used. At aneurysms.
For metal splinters in the eye, such as welders may have blindness can be caused by the shift of the metal particles. Metal attached to the body can burn and cause severe burns. Who comes with eye-liner on the machine will have to deal with fluttering eyelids. People with tattoos that even with old ink with metal particles in it made getting tingling and sometimes severe pain. An MRI machine is basically never in the off position because it requires a minute long procedure with helium. There is no on / off button, and any metal which is in the vicinity is drawn towards the machine.
Metal outside the body but in the machine bring injury because they turn into flying projectiles! MRI even has such a strong magnetic force that every object in the room, think of stethoscopes, vacuum cleaners, oxygen tanks, scissors, heart monitors and stretchers can fly. Tunnel with great force smaller objects are drawn by the large magnet even from the pockets of hospital staff and brought great harm. An example of where MRI can lead to the tragic death of a 6-year-old boy who was compressed by an oxygen tank in the tunnel flew where he underwent his scan.
Risks by heating
Because there is a temperature rise in the body and to the surface of the body can take place from a few tenths of a degree during the MRI scan to a few degrees, different effects may occur. An example is that this may have implications for male fertility in the future because too strong heating in situ in the worst case lead to sterility. Babies and patients are sedated are also sensitive to the warming of their body into the magnet. Each local heating can all lead to risk more or less severe burns.
Many MRIs performed to exclude certain rare diseases but by the availability of modern research methods such as MRI balance often strikes out to “on the side of caution” instead of taking a clear finding that MRI is strictly necessary. There would always be a trade-off must be made between the degree of necessity and the possible consequences of MRI and also the condition of the patient and the consequences if MRI is waived. Still by a diagnostic excess a large part of the MRI examinations undergo completely in vain and a relatively small group being a victim of even MRI itself.
Overall, MRI is one of the best ways to bring a body map but with an incorrect preparation and ignorance of the doctor’s result in significant ear and other adverse damage. MRI is therefore unfortunately not as safe as is portrayed.