Why do you feel dizzy when lying down and what to do about it?

Definition

Benign paroxysmal positional vertigo (BPPV) occurs in repeated episodes, often lasting less than one minute. Attacks are triggered by changes in head position: turning, throwing back, as well as changes in body position, including lying down, even in sleep. Between attacks, autonomic disturbances (nausea, rarely vomiting, fluctuations in blood pressure, sweating) and imbalance may persist, so patients may describe constant dizziness.

Over time, the severity of attacks usually decreases. The word “benign” means that the disease goes away on its own, without treatment, without causing lasting harm to the patient.

BPPV is the most common type of dizziness. Attacks most often develop in older women. However, the disease can occur at any age.

Attacks of BPPV, in most cases, are associated with separation, destruction or increase in size of the otoliths.

Otoliths (otoconia) are layered pebbles consisting primarily of calcium carbonate crystals, like mother of pearl or nacre. They are immersed in a jelly-like layer that envelops the hairs of sensitive cells on the surface of the macula (macula) of the spherical and eleptic sacs of the vestibular analyzer. The otoliths, the jelly-like layer and the hairs of sensory cells form the otolithic membrane.

The elliptic sac (uterus) connects to three semicircular tubules (SCC), located in three perpendicular planes: lateral, anterior and posterior. In their extensions at the junction with the uterus, there is also a sensitive area - the ampullar ridge, covered with a structure similar to the otolithic membrane - the cupula. Normally, the cupula separates the RCC and the utricle. It does not contain otoliths. The cupula provides the perception of angular accelerations of the head, responding to changes in pressure in the ampulla arising due to the inertia of the endolymph (the fluid that fills the RCC and the sacs of the vestibular analyzer).

Detached otoliths or fragments thereof may enter the ampullae of the RCC and irritate the cupular areas. This more common variant of BPPV is called canalithiasis.

Thanks to the balance between the formation and resorption of the layers that make up the otoliths, their renewal is ensured, as well as the resorption of detached otoliths. When the balance is disturbed, one of the otoliths becomes large (2-4 times larger than neighboring cells); the large mass leads to greater displacement compared to neighboring fixed otoliths, which is a source of irritation of the vestibular system. This variant of BPPV is called dome lithiasis; it is characterized by a longer course (several months) and lack of effect from vestibular maneuvers.

Asymmetrical signal input to the brain during unilateral stimulation of the vestibular apparatus disrupts the illusion of balance created by the interaction of the vestibular, visual and proprioceptive systems (receiving signals from muscles and ligaments, assessing the position of limb segments). There is a feeling of dizziness.

Sensitive cells of the vestibular analyzer send a signal of maximum intensity to the brain during the first second of stimulation, then the signal strength decreases exponentially, which underlies the short duration of BPPV symptoms.

The most common lesion is the posterior SCC (90%), less often the lateral one (8%), the remaining cases are caused by damage to the anterior SCC and combined damage to several tubules. Classic cases of BPPV due to posterior RCC involvement are idiopathic in 35% of cases, with previous traumatic brain injury (sometimes minor) and whiplash in the neck occurring in 15% of patients.

In other cases, BPPV is caused by other disorders: most often Meniere's disease (30%), vestibular neuronitis, surgical interventions on the organ of hearing, paranasal sinuses, herpetic lesions of the ear ganglion and circulatory disorders of the structures of the inner ear. Population studies have revealed a direct relationship between the likelihood of developing BPPV and age, female gender, migraine, giant cell arteritis, risk factors for cardiovascular complications - arterial hypertension and dyslipidemia, as well as a history of stroke, which confirms the importance of vascular causes in some cases.

Lindsay-Hemenway syndrome has been identified - acute dizziness, followed by the development of BPPV attacks and a decrease or complete disappearance of nystagmus in the caloric test due to circulatory disorders in the anterior vestibular artery system.

The diagnosis of BPPV is made based on the assessment of nystagmus during special maneuvers - techniques that cause angular accelerations of the patient's head.

Damage to the posterior semicircular tubule

The Dix-Hallpike test is the “gold standard” for diagnosing BPPV caused by posterior SCC pathology:

1. The patient sits straight along the couch, with his head turned 45˚ towards the labyrinth that is being examined.
2. The patient is placed in a lying position, while the head rotation is maintained, the head is thrown back at an angle of 30˚ relative to the axis of the body, and hangs over the edge of the couch.
3. Watch eye movements. Nystagmus and dizziness occur with a delay of several seconds and last less than 1 minute. Nystagmus has a typical trajectory: first, a tonic phase occurs, during which the eyeball is moved upward, away from the underlying ear, a rotatory component is noted, then clonic eye movements toward the floor occur. the underlying ear.
4. After the nystagmus stops, the patient is returned to a sitting position and the eye movements are observed again; the nystagmus may reappear, but in the opposite direction.

When the test is repeated with turning the head in the same direction, the intensity and duration of the nystagmus decrease each time.

The procedure is repeated with the head turned in the opposite direction.

The affected side is determined by which side positional nystagmus and dizziness occur.

Mental disorders

6. Panic attacks.

Anxiety and stress are common in our lives. Sometimes a person suffers from a seemingly hopeless situation, his “head is spinning” from the problems that have piled up, in a state of despair “the ground is disappearing from under his feet”... Finding himself in a crowd of people (in a large store, subway), he feels fear and anxiety (“everything flashes before his eyes”), on the plane he freezes from the horror of a possible plane crash... In a state of stress, and especially when overtired, some people experience anxiety attacks, which may be accompanied by a feeling of dizziness, which is purely psychogenic in nature. In this case, the help of a qualified psychoneurologist, psychotherapist, or psychologist can be effective. The combination of psychotherapy (both medicinal and non-medicinal) and breathing exercises helps to break the vicious circle of anxiety.

Damage to the lateral semicircular tubule

A lesion of the lateral RCC is detected with the patient lying down by turning the head in the plane of the canal from right to left and vice versa (roll test). Horizontal nystagmus occurs, with a clonic component directed downward, mainly when the affected ear is turned downward; if the healthy ear is located below, nystagmus also occurs, the clonic component of which is directed downward, but less pronounced.

In a quarter of patients, canalolithiasis in the lateral RCC is combined with canaloliasis in the posterior RCC. In contrast to downward-directed nystagmus, the clonic component of evoked nystagmus is directed toward the overlying ear. This form is combined with the location of otoliths in the anterior part of the lateral ACC or the otolith fixed to the cupula, while with freely moving otoliths, nystagmus occurs directed towards the underlying ear.

Test results may be influenced by cervical spinal canal stenosis, radiculopathy of the cervical segments of the spinal cord, severe kyphosis, restrictions of movement in the cervical spine: rheumatoid arthritis, ankylosing spondylitis, Paget's disease, spinal cord injury, morbid obesity, Down syndrome. In this case, it is possible to use a Barany swivel chair.

If the test results are negative, a preliminary diagnosis of BPPV is made based on complaints of positional vertigo and is confirmed by successful performance of vestibular maneuvers.

If examination reveals a nystagmus that differs from that described above, as well as other neurological symptoms, it is necessary to exclude other lesions of the nervous system.

A number of types of dizziness and nystagmus appear only when the position of the head in space changes - they are positional.

Nystagmus and rotational vertigo can cause both central (for example, associated with damage to the brain stem or cerebellum) and peripheral (canalolithiasis, vestibular neuronitis, damage to the ear ganglion, perilymphatic fistula) lesions of the vestibular analyzer, as well as combined damage to central and peripheral structures - meningitis, intoxication.

Dizziness can be caused by circulatory disorders: thrombosis of the vestibular arteries, migraine, orthostatic hypotension, paroxysmal heart rhythm disturbances.

The relevance of the differential diagnosis of these causes is due to the fact that the central forms require special intervention.

The most commonly ordered test is an MRI of the brain. In some cases, diagnosis may require an orthostatic test, blood pressure and ECG monitoring, duplex scanning of the brachiocephalic arteries/transcranial Doppler sonography, radiography of the cervical spine, and an ophthalmological examination.

Positional maneuvers are also used to treat the patient. Treatment is carried out with the participation of a doctor and takes into account the location of the otolith according to the diagnostic maneuver.

Cardiological pathology

5. Cardiac arrhythmia.

Dizziness is not always a sign of brain disease. It is often observed in patients with cardiac arrhythmia. The danger of cardiac arrhythmia lies in the fact that when the heart muscle works irregularly, the release of blood into the aorta and, consequently, into the arteries extending from it, carrying blood to the brain, decreases. Due to insufficient blood supply to the brain, a feeling of dizziness and lightheadedness occurs. What to do?

It is necessary to examine the heart. Sometimes cardiac arrhythmia is not visible with a regular ECG and it is necessary to monitor heart rate and blood pressure for a day (and sometimes more) to “catch” the arrhythmia. But with properly selected antiarrhythmic therapy (and sometimes after low-traumatic cardiac surgery), the patient begins to feel much better - performance increases, dizziness stops.

Damage to the posterior semicircular tubule

Epley maneuver

The most studied is the Epley maneuver. It is used for pathologies of posterior and lateral SCC:

1. The patient sits straight along the couch, with his head turned 45˚ towards the labyrinth that is being examined.
2. The patient is placed in a lying position, while the head rotation is maintained, the head is tilted back slightly, hanging over the edge of the couch.
3. After 20 seconds, the head turns to the healthy side by 90˚
4. After 20 seconds, the head is turned in the same direction by 90˚ along with the patient's body, so that the face is facing down.
5. After 20 seconds, the patient returns to a sitting position.
6. The Simon maneuver is also used to treat posterior RCC lesions:
7. In a sitting position, turn the head 45˚ towards the “healthy” ear, for example the right one
8. The patient is quickly placed on his left side (head face up), an attack of dizziness occurs with rotatory nystagmus to the left, the position is maintained for 3 minutes. During this time, the otoliths descend to the lowest part of the RCC.
9. Quickly turn the patient onto his right side (head face down). Maintain the position for 3 minutes.
10. The patient is slowly returned to the starting position.

The fixed otolith resolves within a few weeks. The same amount of time is required for attacks of dizziness to disappear during the natural course of the disease.

According to research by Casani A.R. et al. (2011) the average duration of dizziness with damage to the posterior ACC was 39 days, with damage to the lateral ACC - 16 days.

Manipulations are often accompanied by a sharp temporary increase in the symptoms of the disease: dizziness, nausea, vegetative symptoms.

After the maneuver, the patient must be monitored after 3 days and 1 month, which will allow the maneuver to be repeated if it is ineffective or to promptly begin a search for other causes of dizziness if new symptoms appear.

Relapses occur relatively rarely (3.8 - 29% of cases).

Brandt-Daroff gymnastics

If the maneuvers performed by the doctor are ineffective, patients with damage to the posterior RCC are recommended to perform Brandt-Daroff gymnastics on their own:

1. In the morning, after sleep, sit on the bed with your back straight (Position 1)
2. Then you need to lie on your left (right) side with your head turned up at 45° (to maintain the correct angle, it is convenient to imagine a person standing next to you at a distance of 1.5 meters and keep your gaze on his face) (Position 2)
3. Hold this position for 30 seconds or until the dizziness disappears
4. Return to the starting position sitting on the bed
5. Then you need to lie on the other side with your head turned up 45° (Position 2)
6. Stay in this position for 30 seconds
7. Return to the starting position sitting on the bed (Position 1)

Repeat the described exercise 5 times.

If dizziness does not occur during the exercise, it is advisable to perform it only the next morning. If dizziness occurs at least once in any position, then you need to perform the exercises at least two more times: in the afternoon and in the evening.

Exercises for lesions of the lateral ACC

Vannucchi extended position method

Lying on your side with the affected ear facing up for 12 hours,

Barbecue method

The “barbecue” method - turning the patient 360˚ - the patient in a lying position is successively turned towards the healthy ear by 90˚ until he takes the starting position.

Lampert and Tiel-Wilck method (in the video above - a maneuver for damage to the right ear)

The patient's head is rotated 270˚ from the affected ear to the healthy one.

Special studies have shown the sufficient effectiveness of exercises performed by patients. There were no differences in the effectiveness of the maneuver in specialized clinics and in primary care settings.

Symptoms of the disease

Patients complain of an attack of systemic (rotational) dizziness after changing the position of the head: turning the head from side to side in bed, getting out of bed, going to bed, throwing back the head when looking up, any sudden turns of the head. An attack of dizziness lasts about a minute and is most often not accompanied by other symptoms. Rarely do patients experience nausea, and even less often vomiting. In most cases, patients feel well between attacks.

Drug treatment

There are no drugs that have a direct effect on canal/cupolothiasis.

Drug treatment is advisable only for frequent attacks or during maneuvers.

Drugs are used that reduce the excitability of the vestibular system, both selectively and through a general sedative effect. The first include drugs with a vestibulolytic effect - blockers of H1 and H3 histamine receptors, cinnarizine, atarax, first generation antihistamines - diphenhydramine, pipolfen.

Evidence has been obtained in favor of reducing the intensity of dizziness when performing the Epley maneuver simultaneously with taking betahistine 24 mg x 2 times a day for a week.

Sedatives, most commonly benzodiazepine tranquilizers (diazepam), are used in hospital settings for the symptomatic treatment of severe recurrent attacks.

Diseases of internal organs

7. Anemia.

General weakness, fatigue and dizziness are sometimes associated with a low red blood cell count due to hidden blood loss, iron or vitamin B12 deficiency in the blood. To clarify the diagnosis, it is necessary to examine a general clinical blood test and other indicators. When anemia is detected, it may be necessary to consult a hematologist, gastroenterologist, and sometimes a surgeon.

Dear patients! Hundreds of monographs have been written about dizziness; specialists are dealing with this problem. Don't try to diagnose yourself. See your doctor.