RT Book, Section
A1 Freeman, Roy
A2 Loscalzo, Joseph
A2 Fauci, Anthony
A2 Kasper, Dennis
A2 Hauser, Stephen
A2 Longo, Dan
A2 Jameson, J. Larry
SR Print(0)
ID 1197683182
T1 Syncope
T2 Harrison's Principles of Internal Medicine, 21e
YR 2022
FD 2022
PB McGraw-Hill Education
PP New York, NY
SN 9781264268504
LK accessmedicine.mhmedical.com/content.aspx?aid=1197683182
RD 2024/04/23
AB Syncope  is  a  transient,  self-limited  loss  of  consciousness  due  to  acute  global  impairment  of  cerebral  blood  flow.  The  onset  is  rapid,  duration  brief,  and  recovery  spontaneous  and  complete.  Other  causes  of  transient  loss  of  consciousness  need  to  be  distinguished  from  syncope;  these  include  seizures,  vertebrobasilar  ischemia,  hypoxemia,  and  hypoglycemia.  A  syncopal  prodrome  (presyncope)  is  common,  although  loss  of  consciousness  may  occur  without  any  warning  symptoms.  Typical  presyncopal  symptoms  include  lightheadedness  or  faintness,  dizziness,  weakness,  fatigue,  and  visual  and  auditory  disturbances.  The  causes  of  syncope  can  be  divided  into  three  general  categories:  (1)  neurally  mediated  syncope  (also  called  reflex  or  vasovagal  syncope),  (2)  orthostatic  hypotension,  and  (3)  cardiac  syncope.