PHA 3112 Lecture Notes - Lecture 10: Psychogenic Non-Epileptic Seizures, Status Epilepticus, Frontal Lobe
12 Mar 2018
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200,000 people 4. 4/100,000; ~1 epilepsy by 20. Convulsion = intense paroxysm of involuntary repetitive muscular contractions. Seizure = all paroxysm of involuntary repetitive muscular contractions. Nonconvulsive seizure = impaired consciousness, but not abnormal bodily movement. Absence/petit mal seizures = brevity/rapid onset/cessation/frequency/interruption of consciousness (10% motionless; 90% brief burst of fine myoclonic movements of eyelids/facial muscles,etc) (~2-10s: reestablishes full contact w/environment, resumes preseizure activity) Focal/parietal seizures = simple partial (retained consciousness), complex partial (impaired consciousness) (arise from foci in sensorimotor cortex) ; temporal lobe = complex hallucinations) (vertiginous sensations = dizziness; rarely first symptom of a seizure; visceral sensations = vague) Psychogenic nonepileptic seizures = pseudoseizures common, simulate convulsive/nonconvulsive seizure, no neuronal discharged. Ras = reticular formation found throughout brainstem (inactivation/destruction unarousable state) Withdrawal of vascular sympathetic tone to heart + excessive vagal effect & bradycardia. Diminished cardiac output because of disease of the heart itself/from inadequate intravascular volume. Other causes of episodic faintness/syncope (hypoxia, anemia, diminished co2)
