RT Book, Section
A1 Freeman, Roy
A2 Jameson, J. Larry
A2 Fauci, Anthony S.
A2 Kasper, Dennis L.
A2 Hauser, Stephen L.
A2 Longo, Dan L.
A2 Loscalzo, Joseph
SR Print(0)
ID 1160047030
T1 Syncope
T2 Harrison's Principles of Internal Medicine, 20e
YR 2018
FD 2018
PB McGraw-Hill Education
PP New York, NY
SN 9781259644016
LK accesspharmacy.mhmedical.com/content.aspx?aid=1160047030
RD 2024/04/18
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  dizziness,  lightheadedness  or  faintness,  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.