SYNCOPE Mechanisms and Management Notes | EduRev

: SYNCOPE Mechanisms and Management Notes | EduRev

 Page 1


SYNCOPE  
Mechanisms and Management 
 
 
John  Telles MD, FACC 
 August 9, 2006 
 
Page 2


SYNCOPE  
Mechanisms and Management 
 
 
John  Telles MD, FACC 
 August 9, 2006 
 
Page 3


SYNCOPE  
Mechanisms and Management 
 
 
John  Telles MD, FACC 
 August 9, 2006 
 
Case Study 
 
• 20 y/o female 
competitive cyclist 
• Dizzy when stands up 
quickly 
• Syncope during 
training ride 
 
 
 
Page 4


SYNCOPE  
Mechanisms and Management 
 
 
John  Telles MD, FACC 
 August 9, 2006 
 
Case Study 
 
• 20 y/o female 
competitive cyclist 
• Dizzy when stands up 
quickly 
• Syncope during 
training ride 
 
 
 
Syncope   (Greek – to interrupt) 
• Syncope is the sudden 
transient loss of 
consciousness and postural 
tone with spontaneous 
recovery. 
• Loss of consciousness 
occurs within 10 seconds 
of hypoperfusion of the 
reticular activating system 
in the mid brain. 
Page 5


SYNCOPE  
Mechanisms and Management 
 
 
John  Telles MD, FACC 
 August 9, 2006 
 
Case Study 
 
• 20 y/o female 
competitive cyclist 
• Dizzy when stands up 
quickly 
• Syncope during 
training ride 
 
 
 
Syncope   (Greek – to interrupt) 
• Syncope is the sudden 
transient loss of 
consciousness and postural 
tone with spontaneous 
recovery. 
• Loss of consciousness 
occurs within 10 seconds 
of hypoperfusion of the 
reticular activating system 
in the mid brain. 
Maintenance of Postural 
Normaltension 
 
• Upright posture results in translocation 
of 30%  of central blood volume to 
dependent body parts within seconds and 
transcapillary fluid shifts over 30 
minutes further reduce blood volume by 
5%. 
• Compensatory responses 
     Muscle pump 
     Nuerovascular compensation 
     Humoral compensation 
     Local vascular  
 
 
 
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