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Syncope: Difference between revisions
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==Classification Of Syncope== | ==Classification Of Syncope== | ||
Syncope can be classified into: | |||
[[Image:Syncope_class.svg|center]] | [[Image:Syncope_class.svg|center]] | ||
==Pathophysiology== | ==Pathophysiology== | ||
[[Image:Pathophysiology.svg| | [[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. | |||
{| | |||
|- | |||
|align="center" | '''Mean arterial blood pressure''' | |||
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|align="center" | '''=''' | |||
|- | |||
|align="center" |'''Cardiac output * Total peripheral resistance''' | |||
|} | |||
==Epidemiology== | ==Epidemiology== | ||