Tinnitus: what is it, causes, treatment, prognosis, prevention

What is Tinnitus?

Tinnitus Is a common condition characterized by the perception or sensation of sound, even if there is no visible external sound source. Tinnitus is often referred to as "ringing in the ears." However, sounds associated with tinnitus are also described as hiss, chirps, crickets, whistles, or roars, among others, which can affect one or both ears. Tinnitus is generally classified into two types: subjective and objective. Subjective tinnitus is very common and is defined as a sound that only a person with tinnitus hears. Subjective tinnitus is a purely electrochemical phenomenon, and an outside observer cannot hear it, no matter how hard he tries. Objective tinnitus, which is much less common, is defined as sound coming from an “objective” source. for example, a mechanical defect or a specific sound source, and can be heard by an outside observer with favorable conditions. Objective tinnitus sounds originate somewhere inside the body and reach the ears by passing through various tissues of the body. The objective form of the disorder is usually caused by disorders that affect the blood vessels or the muscular system.

Most cases of tinnitus are subjective. Objective tinnitus is much less common. However, the diagnosis of objective tinnitus depends on how hard and well the objective (external) listener tries to hear the sound in question. Because of this problem, some clinicians now simply refer to tinnitus as rhythmic or irregular. Typically, rhythmic tinnitus correlates with objective tinnitus, and irregular tinnitus correlates with subjective tinnitus. Specific forms of tinnitus, such as pulsating and muscular tinnitus, which are forms of rhythmic tinnitus, are relatively rare. Pulsating tinnitus can also be known as impulsive tinnitus. Correctly identifying and distinguishing between these less common forms of the disorder is important because the underlying cause of pulsatile or muscular tinnitus can often be identified and treated.

Signs and symptoms

People with tinnitus describe a wide variety of sounds, including ringing, clicking, hissing, buzzing, chirping, whistling, and roaring. These sounds can always be present, or they can come and go. The volume, pitch, or quality of tinnitus can also vary. Some people report that their noise in ears most obvious when external sounds are quiet (eg at night). Others describe tinnitus as loud even with external sounds or noise, and some describe it as aggravated by sounds. Tinnitus can affect one or both ears. The sound can also sound like it is inside the head and not in the ears at all.

The level of loudness or irritation caused by tinnitus varies greatly from person to person. Loudness and irritation are not always the same. A person with loud tinnitus may not be worried, while a person with mild tinnitus may be irritated. Most people with subjective tinnitus suffer from hearing loss, which is found on a standard clinical audiogram. Tinnitus can sometimes get worse and sometimes get better over time.

Pulsating and muscular tinnitus are two forms that can be classified as rhythmic tinnitus. In pulsating tinnitus, the characteristic sound reflects or matches (synchronizes) with the person's heartbeat. It is rarely described as a ringing sound, but more often as a sibilant, pulsating or squealing sound.

In muscle tinnitus, the sound is often described as "clicking" and is usually associated with myoclonus affecting the muscles near or in the ear. Myoclonus Is an involuntary spasm or twitching of a muscle or muscle group caused by abnormal muscle contractions and relaxation.

Causes and risk factors

There are numerous, varied causes of irregular tinnitus, the most common of which are hearing loss and / or noise exposure. Rhythmic tinnitus is usually caused by disorders that affect the blood vessels (vascular system) or muscles (muscular system).

Pulsating tinnitus is usually caused by abnormalities or abnormalities in blood vessels (vascular disease), especially blood vessels near or around the ears. Such abnormalities or disorders can cause changes in blood flow through the affected blood vessels. Blood vessels can be weakened due to damage caused by hardening of the arteries (atherosclerosis). For example, abnormalities affecting the carotid artery, the main artery serving the brain, may be associated with pulsating tinnitus. A rare cause of pulsatile tinnitus is a condition known as fibromuscular dysplasia. (FMD), a condition characterized by pathological abnormalities in the microcirculation system, wall changes arteries. When the carotid artery is affected by FMD, pulsating tinnitus can develop.

Perhaps the most common cause of pulsating tinnitus is sigmoid sinus diverticulum and dehiscence, which collectively can be called sinus wall abnormalities. The sigmoid sinus is a blood channel on the side of the brain that carries blood from the veins in the brain. Eventually, blood is released through the internal jugular vein. Sigmoid sinus diverticulum refers to the formation of small sac-shaped sacs (diverticula) that protrude through the wall of the sigmoid sinus into the mastoid bone behind the ear. Dehiscence means the absence of a portion of the bone surrounding the sigmoid sinus in the mastoid process. It is not known if these conditions represent different parts of the same disease process or spectrum, or if they are two different conditions. These abnormalities cause changes in pressure, circulation and noise in the sigmoid sinus, which ultimately lead to pulsating tinnitus. Narrowing of the blood vessel leading to the sigmoid sinus, known as the transverse sinus, is also associated with pulsating tinnitus.

Upper semicircular canal dehiscence syndrome is another common cause of pulsating tinnitus. The superior semicircular canal is one of the three canals of the vestibular apparatus of the inner ear. The vestibular apparatus helps maintain balance and balance. In this syndrome, the portion of the temporal bone that covers the superior semicircular canal is abnormally thin or absent. Upper semicircular canal dehiscence syndrome can affect hearing and balance to varying degrees.

Additional conditions that can cause pulsating tinnitus include noise in the arteries, abnormal passages, or connections between blood vessels in the outer layer of the membrane (dura mater) covering the brain and spinal cord (dural arteriovenous fistula), or conditions that cause increased pressure inside the skull, such as idiopathic intracranial hypertension (pseudotumor of the brain). Dehiscence of the sigmoid sinus may be associated with pseudotumor, but this relationship has not been established. It is possible that cases of pulsating tinnitus associated with pseudotumor may be caused by undiagnosed sinus wall abnormalities. Pulsating tinnitus can also be caused by head trauma, surgery, conductive middle ear hearing loss, and some tumors. Obstructions in the vessels that connect the heart and brain can also cause pulsating tinnitus.

Muscular tinnitus can be caused by several degenerative conditions affecting the head and neck, including amyotrophic lateral sclerosis or multiple sclerosis. Myoclonus can also cause muscle tinnitus, especially palatine myoclonus, which is characterized by abnormal contractions of the palate muscles. Spasms of the stapes muscle (which attaches to the stapes), which is the smallest muscle in body, and the tympanic muscle, located in the middle ear, are also associated with objective tinnitus. Myoclonus or muscle spasms can be caused by an underlying medical condition such as swelling, tissue death due to lack of oxygen (heart attack) or degenerative disease, but most often it is benign and self-limiting problem.

Eustachian tube pathologies may be associated with tinnitus. The eustachian tube is a small canal that connects the middle ear to the back of the nose and the top of the throat. The Eustachian tube usually remains closed. In people with an abnormal Eustachian tube, it is abnormally open. Consequently, talking, chewing, swallowing and the like can vibrate directly in the eardrum. For example, victims may hear breath sounds synchronized with breathing.

Affected populations

Tinnitus affects men and women equally. It can affect people of any age, even children. Tinnitus collectively is a very common condition that is estimated to affect about 10% of the general population. Rhythmic tinnitus is much less common than non-rhythmic tinnitus, accounting for approximately 1% of all cases of tinnitus and is considered relatively rare in the general population. The exact prevalence or frequency of rhythmic tinnitus is unknown. Rhythmic ringing in the ears due to pseudotumor and sinus wall abnormalities is most common in women who are overweight and obese at the 3rd-6th decade of life. The disorder can be sudden or develop slowly over time.

Diagnostics

The diagnosis of tinnitus is based on the identification of characteristic symptoms, a detailed history of the patient, careful clinical evaluation, and complete audiological equipment. These studies will help distinguish rhythmic from non-rhythmic tinnitus. It is difficult to overestimate the fact that tinnitus is a symptom of another underlying condition and not a diagnosis in itself. Because of the many underlying causes of tinnitus, various specialized tests may be required to determine the specific cause. Trying to determine the root cause of tinnitus is the first step in evaluating a person with tinnitus.

—​ Analyzes and examinations.

Patients with the disease first undergo a medical examination, which begins with a hearing test (audiogram). A person with tinnitus may also be asked to perform a series of movements, including clenching the jaw, neck, or eyes. If these movements cause a change in tinnitus, this can help the doctor figure out the cause.

Diagnosing rhythmic tinnitus may require a series of diagnostic tests to pinpoint the exact cause. The specific tests performed will vary from case to case, depending in part on the results of the initial medical assessment.

Typically, special medical imaging is done after an initial examination for individuals with suspected tinnitus. People can have high-resolution computed tomography (HRCT) or magnetic resonance angiography (MRA), to assess blood vessel abnormalities such as vascular malformation that may be causing tinnitus. HRCT can also be used to evaluate the temporal bone for sinus wall abnormalities and superior semicircular canal dehiscence. HRCT uses a narrow X-ray beam and advanced computer analysis to create detailed images of structures within the body, such as blood vessels. MRA is performed using the same equipment as for magnetic resonance imaging (MRI). MRI uses a magnetic field and radio waves to produce cross-sectional images of specific structures or tissues within the body. MRA provides detailed information about blood vessels. In some cases, an intravenous line is inserted into a vein before scanning to inject a special dye (contrast). This contrast highlights blood vessels, thereby improving scan results.

These tests are usually performed in place of traditional catheter angiography, which is more invasive and although very safe overall, carries an increased risk of complications. Angiography is an imaging technique in which a dye is injected into a small tube called a catheter, which is inserted into a blood vessel. An x-ray is then taken to assess the condition of the vessels, as well as the speed of blood flow.

Ultrasound is another test method that can help diagnose the disorder. Ultrasound uses reflected high frequency sound waves and their echoes to create images of structures within the body. Ultrasound can show how blood is flowing in vessels, but is only useful for accessible vessels. It does not help to examine the blood vessels of the skull.

Various additional tests may be performed to rule out other potential conditions or underlying causes of tinnitus, depending on the specificity of each individual case.

Standard treatments

NERYTHMIC TINNITUS.

Since hearing loss is the most common cause of irregular tinnitus, in most cases, initial treatment is is hearing rehabilitation with hearing aids or surgery, depending on the specific causes.

In some cases, a special audiological device may be prescribed and worn like a hearing aid. These devices, called maskers, emit low-level continuous white noise that suppresses tinnitus. In some cases, a hearing aid may be recommended to help suppress or attenuate sounds associated with tinnitus. A combination device (masking devices and hearing aid) can also be used. Masking devices provide immediate relief by reducing or drowning out tinnitus. However, when the masking device is removed, the sound remains in the ears.

Tinnitus habituation, such as retraining therapy for tinnitus tinnitus retraining therapy [TRT]) involves the gradual use of sounds to reduce their perception in the ears. This differs from the use of the cloaking devices described earlier. The TRT includes a wearable device that the victim can adjust so that the sound level emitted by the device is approximately equal to or equal to the sound in the ears. This can be called a “mixing point” as the sound from the device and the sound of the tinnitus begin to mix. The victim must repeatedly tune the device so that the sound is at or just below the mixing point. TRT is supported by consulting a trained professional who can teach the person the correct techniques to maximize the effectiveness of TRT. After all, by following this method, the affected people no longer need an external sound device. Affected people become accustomed to the sound of ringing in their ears, unless they choose to focus on it. Even then, the sound will not interfere or disturb. The theory is akin to a person's ability to ignore sounds such as the hum of an air conditioner, the fridge engine turning on, or raindrops falling on the roof when driving in the rain.

Some people with tinnitus may find relief by listening to pleasant background sounds (such as ocean surf).

RHYTHMIC TINNITUS.

Treating the underlying condition can help improve or cure rhythmic tinnitus. For example, treatment for blood vessel disorders (eg, dural arteriovenous fistula) may include certain medications or surgery. A surgical procedure known as sinus wall reconstruction can successfully treat pulsating tinnitus due to sigmoid sinus diverticulum and dehiscence. In fact, most people have experienced complete disappearance of tinnitus after this surgery. Surgery may also be required in rare cases of pulsating tinnitus caused by a tumor.

Muscular tinnitus can go away without treatment. If the tinnitus persists, you can try muscle-relaxing drugs (muscle relaxants). In some cases, surgery may be required.

People with rhythmic tinnitus for no known cause can be treated with masking devices, TRT, or other habituation methods.

Forecast

The prognosis for tinnitus depends on the cause. In people with tinnitus associated with earwax build-up or medication, the condition usually resolves when the earwax is removed or the medication is stopped. In people with tinnitus associated with sudden loud noise, the sound in the ears may gradually decrease, although there may be permanent noise-related hearing loss.

Even when standard medical treatments fail to get rid of tinnitus, most people learn to tolerate this problem by ignoring the sound or using different methods sound masking. For others, however, the constant ringing affects their well-being and increases depressed mood or anxiety.

Prophylaxis

The best way to prevent tinnitus is to avoid loud noises. Wear ear plugs or headphones when working with loud equipment such as chainsaws, lawn mowers, and high-speed power tools.