بسم الله الرحمن الرحيم. problems of spatial disorientation by prof. dr. mohamed...
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PROBLEMS OF SPATIALDISORIENTATIONBYPROF. DR. MOHAMED SAAD
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BASIC CONSIDERATIONS
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APPROPRIATE ORIENTATION AND POSITION OF THE BODY IN SPACE DEPENDS UPON AFFERENT IMULSES FROM* The retinae.* The labyrinthes.* The proprioceptors of neck joints & muscles.* The proprioceptors of lower limbs & trunk.
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AFFERENT IMULSES DERIVED FROM THESE SENSE ORGANS ARE INTEGRATED BY :-The cerebellum.The vestibular nuclei.The medial longitudinal bundle.The red nuclei.Higher centers (temporal & parietal lobes).
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DISORDERED ORIENTATION IN SPACE RESULT FROM DISORDERED FUNCTION OF :-Sensory end organs.
Afferent paths.
Central connections.
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DEFINITIONS
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* DIZZINESS (Broad term).
* VERTIGO (Sense of rotation).
* GIDDINESS (Light headedness).
* DYSEQUILIBRIUM (Unsteadiness).
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VERTIGO IS OFTEN ACCOMPANIED BY :-Vegitative effects.
Disturbance of posture.
Nystagmus.
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CAUSES OF VERTIGOPeripheral causes.B) Central causes.C) Other causes.
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PERIPHERAL CAUSESVestibular.
Non vestibular.
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VESTIBULAR CAUSESLabyrinthine or oral vertigoEighth nerve lesions - Affected cochlear apparatus - Sever vertigo- Temporaty
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LABYRINTHINE OR AURAL VERTIGOMIDDLE EAR DISTURBANCES:InflammationEustachian tube obstructionINNER EAR DISTURBANCES:- Circulatory - Drugs & toxins- Inflammation - Meniere,s syndrome- Perilymphatic fistulas - Benign positional vertigo- Post traumatic - Unaccustomed stimuli
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EIGHTH NERVE LESIONSVestibular neuronitis.Meningitis.CPA tumours.
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NON-VESTIBULAR CAUSES - Rare. - Associated manifestations.
OCULAR CAUSES:* Abnormal visual perception.* Ocular palsies. NECK CAUSES:* Fibrositis.* Diseases of cervical vertebrae.
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CENTRAL CAUSES - Non affected peripheral cochlear apparatus. - Less sever but persistent vertigo. - Signs of involvement of neighboring structures.
* BRAIN STEM LESIONS. * CEREBELLAR LESIONS. * CORTICAL DISTURBANCES.
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BRAIN STEM LESIONSVascular lesions.Neoplastic lesions.Encephalitis.M.S.
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CEREBELLAR LESIONSCerebellar infarctin.
Intra-cerebellar hge.
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CORTICL DISTURBANCES* Lesions e.g. vascular neoplastic * Epilepsy.
* Migraine.
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OTHER CAUSES OF DIZZINESSCardiovascular disturbances.Vasovagal phenomena.Other medical causes.Psychiatric disorders.
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CARDIOVASCULAR DISTURBANCESOrthostatic hypotension.Cardiac arrhythmias.Carotid sinus hypersensitivity.
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VASOVAGAL PHENOMINACommon vasovagal syncope.
Reflex vasovagal syncope.
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OTHER MEDICAL CAUSESAnemia.Hypoglycemia.Etc.
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PSYCHIATRIC DISORDERSHyperventilation syndrome.Anxiety neurosis.Hysterical neurosis.Affective disorders.
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MANAGEMENT OF DIZZINESS
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TAKING THE HISTORY- Onset course & duration of symptoms.- Factors that precipitate, aggravate, or relieve symptoms.Is consciousness lost ?Are cochlear & vestibular symptoms associated ?Has there been recent head trauma ?Is there numbness in hands & feet, visual impairment, or history of diabetes or anemia ?Are there cardiac symptoms ?Are there psychiatric symptoms ?
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CLINICAL EXAMINATIONExamination of the ears: External auditory meatus. - Ear drum Hearing. - Etc.Neurological examination:- Nystagmus. - Cranial nerves.- Co-ordination. - Motor system.- Sensory system. - Other systems.
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INVESTIGATIONS* Complete blood picture. * Blood glucose.* ECG. * Audiometry.* EEG. * BAEP.* X-ray cervical spine. * X-ray skull.* CT scan. * MRI.
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TREATMENTTreatment of the cause.Symptomatic treatment:- Antihistamines (Dimenhydrinate).- Anticholinergic drugs (Scopolamine).- Dopaminergic drugs (Piribedil).- H3 receptors antagonists (Betahistine).- Phenothiazines (Chlorpromazine).- Mild tanquilizers (Diazepam)