Syncope [Disease/Finding] Fainting C0039070 Syncope 309585006 A transient loss of consciousness and postural tone caused by diminished blood flow to the brain (i.e., BRAIN ISCHEMIA). Presyncope refers to the sensation of lightheadedness and loss of strength that precedes a syncopal event or accompanies an incomplete syncope. (From Adams et al., Principles of Neurology, 6th ed, pp367-9) 271594007 C5924 D013575 Syncope 272030005 N0000002873 M0020955 1023272 Unconsciousness [Disease/Finding]