Sandbox:Sahar

Pathophysiology of Syncope

Cerebral hypoperfusion

Low cardiac output

Low cardiac output/Low peripheral resistance

Low peripheral resistance

Inadequate renous return

Cardiac/Pulmonary cause

Inappropriate reflex

Venous depletion/pooling

Arrhythmia or Structural heart disease

Vasodepressors/Cardioinhibitors

Drugs

Autonomic nervous failure

Inadequate venous return

Cardiac/Pulmonary cause

Inappropriate reflex

Normal ANS

Damaged ANS

Low cardiac output

Low cardiac output/Low peripheral resistance

Low peripheral resistance

Cerebral hypoperfusion

Syncope

Abbreviations: ANS: Autonomic nervous system

Common Causes of Sick sinus syndrome
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Images

Contrast enhanced CT: Aortic intramural hematoma, Courtesy of radiopaedia

Contrast enhanced CT: Aortic intramural hematoma, Courtesy of radiopaedia

Contrast enhanced CT: Aortic intramural hematoma, Courtesy of radiopaedia

Contrast enhanced CT: Aortic intramural hematoma, Courtesy of radiopaedia

Contrast enhanced CT: Aortic intramural hematoma, Courtesy of radiopaedia

Contrast enhanced CT: Aortic intramural hematoma, Courtesy of radiopaedia

Disease Name	Age of Onset	Gender Preponderance	Signs/Symptoms	Imaging Feature(s)	Macroscopic Feature(s)	Microscopic Feature(s)	Laboratory Findings(s)	Other Feature(s)	ECG view