Syncope: Difference between revisions

Syncope (view source)

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 ==Classification Of Syncope==
+Syncope can be classified into:
 [[Image:Syncope_class.svg|center]]
 ==Pathophysiology==
-[[Image:Pathophysiology.svg|Classification of syncope by pathofysiological origin. ANF = autonomic nervous failure; ANS = autonomic nervous system; BP = blood pressure; low periph. resist. = low peripheral resistance; OH = orthostatic hypotension|500px|thumb]]
+[[Image:Pathophysiology.svg|Pataphysiological basis of the classification. ANF = autonomic nervous failure; ANS = autonomic nervous system; BP = blood pressure; low periph. resist. = low peripheral resistance; OH = orthostatic hypotension|250px|thumb|left]]
+The mean arterial blood pressure is determined by the cardiac output (CO), systemic vascular resistance (SVR) and central venous pressure. Syncope can be caused by a low peripheral resistance (vasodepressor type), a low cardiac output (cardioinhibitory type) or a combination of both.
+A low peripheral resistance can be caused by an inappropriate reflex, or autonomic failure. A low cardiac output can be caused by reflex bradycardia, arrhythmias, or structural cardiac diseases or inadequate venous return.
-Syncope can be caused by a low peripheral resistance (vasodepressor type), a low cardiac output (cardioinhibitory type) or a combination of both.
+{|
+|-
+|align="center" | '''Mean arterial blood pressure'''
+|-
+|align="center" | '''='''
+|-
+|align="center" |'''Cardiac output * Total peripheral resistance'''
+|}
-A low peripheral resistance can be caused by an inappropriate reflex, or autonomic failure. A low cardiac output can be caused by reflex bradycardia, arrhythmias, or structural cardiac diseases or inadequate venous return.
 ==Epidemiology==