RT Book, Section A1 Greenberg, David A. A1 Aminoff, Michael J. A1 Simon, Roger P. SR Print(0) ID 1182392155 T1 Seizures & Syncope T2 Clinical Neurology, 11e YR 2021 FD 2021 PB McGraw-Hill Education PP New York, NY SN 9781260458350 LK neurology.mhmedical.com/content.aspx?aid=1182392155 RD 2024/04/25 AB Consciousness is lost when the function of both cerebral hemispheres or the brainstem reticular activating system is compromised. Episodic dysfunction of these anatomic regions produces transient, and often recurrent, loss of consciousness. There are two major causes of episodic loss of consciousness: seizures and syncope.