Autonomic nervous system Autonomic dysfunction

Autonomic nervous system Autonomic dysfunction - Spinal...

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Autonomic nervous system Autonomic dysfunction Autonomic Dysfunction Spinal damage gives rise to disturbances mainly in (depending on lesion site): o Sympathetic control: Blood pressure alterations Sweating Body temperature alterations o Sacral parasympathetic control: Sphincter control Micturition problems Defaecation problems Impotence Horner’s Syndrome o Characteristics: Ptosis & Miosis, Enopthalmos, Anhydrosis & Vasodilation o Caused by damage to sympathetic nerves to levator palpebrae & radial fibres of iris o Lesion in reticulospinal tract (higher lesion): May affect whole body May include asymmetric anhydrosis & contralateral hyperesthesia o Lesion at level of SPN (C8-T2): Affects lower neck, spinal cord & thoracic cavity May include anhydrosis limited to face & neck, & blanching/flushing of face & neck o Lesion at PGN level (compression of plexus): Affects upper neck & carotid pathway May include facial pain/ENT problems
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Unformatted text preview: Spinal Shock o Severe damage to spinal cord o Loss/depression of function below level of lesion o Sensory impairment below level of lesion o Flaccid paralysis o Depression of segmental reflexes o Autonomic changes (loss of sympathetic tone) o Lasts <24hrs to 4/6wks o Gradual recovery & shows normal lesion signs o Early phase of spinal shock: Loss of all reflexes below lesion level Loss of sympathetic tone: skin vessels dilate, skin warm, pink, no sweating, dry Loss of descending control: hypothermia, shivering Blood pressure effects Dilation of peripheral vasculature Autonomic Dysreflexia o Loss of central control of autonomic reflexes (UMN lesions) o Autonomic hyperreflexia – exaggerated response to mild stimuli o Increase in heart rate may occur prior to baroreceptor reflex modulation of parasympathetic activity...
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