Deafness is term used to describe complete or partial loss or absence of the ability to hear.
There are three major types of deafness
Conductive deafness is caused by a defect in the outer or middle ear, which prevents normal transmission of sound. It may be present at birth as the result of an inherited defect, an abnormality in development, or an infection of the fetus in the womb. It may be produced by an injury that perforates the eardrum or that breaks up the linkage of three tiny bones—hammer, anvil, and stirrup—that normally transmit sound from the eardrum through the middle ear to the inner ear. Inflammation of the middle ear, a condition known as otitis media, is another important cause of conductive deafness. Infection from an upper respiratory tract ailment, such as strep throat or the flu, can produce a buildup of pus in the middle ear so great that it ruptures the eardrum. Also, a plugged eustachian tube (the tube leading from the back of the throat to the ear) mat trap fluid in the middle ear, creating temporary deafness. Conductive deafness in the middle and later years is most often caused by otosclerosis. In this inherited condition, new spongy bone grows over the stirrup bone, preventing it from vibrating when sound travels to it through the hammer and anvil bones.
Sensorineural deafness is a type of hearing loss that occurs because of damage to the structures of the inner ear, to the auditory nerve carrying sound messages to the brain, or the hearing center of the brain itself, located in the temporal lobe. It may be due to a head injury during birth, the effects of a woman’s rubella infection on her unborn baby, a skull fracture affecting the inner ear or the auditory nerve, fever, bacterial or viral infections (such as mumps or meningitis), tertiary (final stage) syphilis, Meniere’s disease, tumors, multiple sclerosis, a hemorrhage or blood clot in the inner ear, drug side effect, normal aging, prolonged or repeated exposure to intense noise, or edema(fluid buildup) caused by a thyroid deficiency. Most sensorineural deafness is not nerve deafness, the popular term for it. It is usually sensory deafness, caused by defects in the structure of the inner ear, especially in the cochlea and its organ of Corti. The cochlea contains sensory cells that convert sound waves into electrical impulses, which are transmitted via the auditory nerve to the brain.
Mixed deafness is a relatively common condition. It is a combination of conductive and sensorineural deafness.
People with pure conductive deafness simply need louder volume to hear all sounds. Those with defects in the inner ear usually can hear low-pitched sounds more easily than high-pitched sounds, and some sounds may be distorted. When there is damage to the hearing center in the brain, the person may be able to hear sounds, but has trouble recognizing them and understanding words (this problem can also occur with the other types of deafness).
When hearing loss is suspected, a complete examination of the ears, nose, an throat is necessary to identify infections or abnormalities that may be present. Infections of the adenoids or tonsils, as well as sinus of nasal infections, may be linked to ear infections.
Testing of hearing is important for all ages, but especially for infants. Many times, partial deafness in a baby is not discovered until the child fails to learn to talk, a direct result of the hearing loss. Babies who were born prematurely or ill or whose mothers had certain viral infections, such as rubella, during pregnancy are in special need of testing.
Although inborn hearing defects usually cannot be corrected, deaf children can be helped to deal with their handicap. Starting very early, they can be fitted with hearing aids and can be instructed in lipreading, speaking, and sign language.
Surgery to correct conductive hearing loss includes operations to replace the stirrup bone or all three tiny bones with tissue or synthetic material, to repair a punctured eardrum, and to clean a chronically infected middle ear.
A hearing aid can often help to restore hearing. However, one should be purchased only after thorough testing by a specialist in audiometry, who can suggest the most appropriate type. Classes in lipreading and listening can also be helpful.
It is far easier to prevent deafness than to cure it. Antibiotics have made it possible to eradicate most of the middle ear infections that have been the major source of conductive hearing loss in children. Middle ear problems are also sometimes eliminated by treating allergies that cause the eustachian tubes to close up or by removing infected adenoids. Nerve deafness caused by continued exposure to intense industrial noise, gun shots, rock music, or aircraft engines may be avoided by wearing earplugs or other ear protectors. Some lost hearing may return after several months of relief form intense sound. Medications that can cause hearing loss, including some antibiotics and certain diuretics (drugs that stimulate the production of urine), need to be used with caution, and signs of hearing loss should be brought to a doctor’s attention as soon as they are noticed.
That's some stuff about Deafness types and treatment
(Chasnoff, Ira J, Jeffrey W. Ellis, Zachary S. Fainman. Family Medical & Health Guide .Publications International, LTD (1991) : 139-141)
Naegleria fowleri life cycle Are you looking for naegleria fowleri life cycle? Naegleria fowleri is a free-living ameboflagellate that can cause primary amebic meningoencephalitis in humans (PAM). Of the 30+ species of Naegleria that have been isolated, only N. fowleri has been demonstrated to be pathogenic in humans. Another species, N. australeinsis, has been proven to be pathogenic in mice and is useful in laboratory study of Naegleria pathogenesis (De Jonchheere, 2004). While the number of reported cases of N. fowleri infection is small, because of the fatality of PAM (98% death rate), the amoeba and resulting meningoencephalitis are a public health interest.
Jenny Craig Weight Lose Program Reviews
Jenny Craig isn't a Janie-come-lately to the diet field. The program began in 1983 in Australia and started U.S. operations in 1985.
The Jenny Craig method is a three-level food-mind-body plan to help people lose weight and keep it off.
Kegel Exercises for Women, Benefits and Instruction Are you looking for instruction and benefits Kegel Exercises for Women? A pelvic floor exercise, more commonly called a Kegel exercise (named after Dr. Arnold Kegel), consists of contracting and relaxing the muscles that form part of the pelvic floor, which are now sometimes colloquially referred to as the "Kegel muscles". Several tools exist to help with these exercises, though many are ineffective. Exercises are usually done to reduce urinary incontinence and aid with childbirth in women, and reduce premature ejaculatory occurrences in men, as well as increase the size and intensity of erections.
Gangrene Causes, Symptoms and Treatment Gangrene is a term that refers to the death of body tissue due to diminishment or loss of blood supply, leading to nutrient and oxygen deprivation. There are three major types of gangrene: moist, dry, and gas gangrene. Although gangrene usually affects extremities, it can sometimes affect the internal organs.
Common Ankle Problems The primary care physician will often be the first to evaluate common foot and ankle problems. The patient's complaints will range from acute traumatic injuries to chronic conditions, which have progressed in severity.
The recognition of local and systemic factors that contribute to the patient's condition in conjunction with a thorough history and physical examination will direct the initial plan of management, the use of further diagnostic testing and the necessity of an Orthopaedic referral.
Naegleria fowleri symptoms Are you looking for Naegleria fowleri symptoms? Naegleria is a microscopic ameba (single-celled living organism) that can cause a very rare, but severe, infection of the brain. The ameba is commonly found in warm freshwater (for example, lakes, rivers, and hot springs) and soil. Only one species (type) of Naegleria infects people: Naegleria fowleri.
Safflower Oil Nutrition Value and Information Safflower (Carthamus tinctorius L.) is a highly branched, herbaceous, thistle-like annual. It is commercially cultivated for vegetable oil extracted from the seeds. Plants are 30 to 150 cm tall with globular flower heads having yellow, orange or red flowers. Each branch will usually have from one to five flower heads containing 15 to 20 seeds per head. Safflower is native to arid environments having seasonal rain. It grows a deep taproot which enables it to thrive in such environments.
Fiber foods functions and consumption rule The role fiber plays in promoting nutrition and health has been a controversial subject in recent years. What exactly is fiber? How effective is it in reducing certain health risks? Are certain types of fibers more effective than others?
Fiber, often referred to as “bulk” or “roughage”, is the indigestible portion of plant foods that helps move foods through the digestive system and softens stools by absorbing water. Insoluble fiber, which is found in brain, wholegrain breads and cereals, and most fruits and vegetables, is associated with these gastrointestinal benefits and has also been found to reduce the risk for several forms of cancer. Soluble fiber appears to be a factor in lowering blood cholesterol levels, thereby reducing risk for cardiovascular disease. Major sources of soluble fiber in the diet include oat bran, dried beans (such as kidney, garbanzo, pinto, and navy beans), and some fruits and vegetables.
Plant based diet recipes and book Are you looking for plant based diet recipes and book? Perhaps you read Rip Esselstyn's The Engine 2 Diet or Jonathan Safran Foer’s Eating Animals and want to reduce your risk of lifestyle related diseases and avoid factory farms, or perhaps it's the recent U.N. study that said eating less meat is better for the planet - either way, there’s no doubt that reducing your meat intake and embracing a plant-based diet is one of the best things you can do for your health and the environment.
Types of Blood Cancer Symptoms and Treatments Overview of Blood Cancer
The major forms of blood cancer are lymphoma, leukemia and multiple myeloma. These cancers are formed either in the bone marrow or the lymphatic tissues of the body. They affect the way your body makes blood and provides immunity from other diseases.
What is Pescatarian Definition and Recipes Are you looking for about what is pescatarian? and what are pescatarian recipes? A pescatarian is a person who refrains from eating land animals and birds, but includes fish, mollusks, and crustaceans in addition to fruits, vegetables, plants, legumes, nuts, and grains. This is a common form of “vegetarianism” and is generally considered a very healthy diet. It can also be a stepping stone to full vegetarianism. Pescatarians can enjoy lowfat protein sources that are high in fish oils, which contain Omega 3 fatty acids—the “good fats” that reduce inflammation.
FOODS CAUSE OF ALLERGY People may be sensitive to single or to multiple foods. Here again are some foods which are botanically related, so that if a patient is sensitive to one food in this group, he sensitive to the others. Examples of this may be cited in the case of cabbage, Brussels sprouts, and cauliflower. Many of the sea foods and fresh water fish are thus similarly related; so that if a patient is sensitive to one type of fresh water fish, he is likely sensitive to the others. The most frequent allergy-producing foods are common foods, namely, milk, eggs and wheat, fish and nuts. It is unfortunate that this is the case because these are also essential foods, and this avoidance becomes a serious problem in undernourished people and in children of infants. When a patient is definitely sensitive to one or two foods only, it is not difficult for him to realize it himself. The difficulty arises, however, when he is allege to many foods. Under these circumstances he is likely to become confused and then he needs a physician's help. Allergy to a food may be of various degrees of severity. Symptoms of asthma or hives may not arise if only one food is eaten if the sensitivity is mild. However, if a number of such foods are ingested at one time, the symptoms may be pronounced. Another factor which is important in connection with the production of symptoms is the readiness with which a food is absorbed from the gastrointestinal tract. The quicker the absorption, the more rapid will the symptoms develop after eating.
Signs and Symptoms of Hypothyroidism Are you looking for signs and symptoms of hypothyroidism?Hypothyroidism affects two out of every thousand women. It affects about 6-10% of women over the age of 65 and about 2-3% of men.
The most common cause of hypothyroidism is Hashimoto's thyroiditis, a chronic autoimmune destruction of the thyroid. Other causes of hypothyroidism include radioactive iodine, thyroidectomy, thioamide drugs, and iodine ingestion. Transient hypothyroidism can occur in patients with acute thyroiditis.