ABRET R.EEG.T Study Guide - Activation Procedures with Complete Solutions, Exams of Physiology

Download ABRET R.EEG.T Study Guide - Activation Procedures with Complete Solutions and more Exams Physiology in PDF only on Docsity! ABRET R.EEG.T Study Guide - Activation Procedures with Complete Solutions Why is sleep deprivation considered an activation procedure? - ANSWER-24-36 hours of continuous waking time may stress a potentially epileptogenic brain so that abnormalities will appear in the waking EEG What type of epilepsy is most likely to show abnormalities during sleep? - ANSWER- Patients with complex partial seizures or Foci in the temporal lobes are especially likely to appear in sleep. Sleep should be a routine procedure for patients who have or are suspected of having seizures of any type What is hyperventilation (HV)? - ANSWER-Deep and rapid breathing usually for a period of 3-4 mins. Used as an activation procedure; especially potent for activating absence seizures What are the clinical effects of hyperventilation? - ANSWER-HV causes hypocapnia (decreased CO2 in the system). Clinically characterized by cerebral symptoms including dizziness and even loss of consciousness; also by peripheral symptoms such as tingling in the hands, feet, and mouth. Drowsiness. What electrographic changes are seen during hyperventilation (HV)? - ANSWER- Normal responses consist of generalized bilaterally synchronous slow waves that begin soon after HV; often called a "build-up". Abnormal responses consist of asymmetrical responses and epileptiform discharges. Spike and wave discharges of 3 hz are often activated by HV What are contraindications to HV? - ANSWER-1) Acute stroke 2) Recent intracranial hemorrhage 3) Large vessel stenosis 4) Recent TIA 5) Severe cardiopulmonary disorders 6) Sickle cell disease 7) Moyamoya disease What is a Photomyogenic Response? - ANSWER-A Photomyogenic response to intermittent photic stim is characterized by brief, repetitive muscular spikes over the anterior regions of the head. The muscle potentials occur at the same rate as the photic stim and stop as soon as the photic stim is stopped