Causes of Syncope - Differential Diagnosis Algorithm Cardiac - Arrhythmia: • Tachyarrhythmia • Bradyarrhythmia • Supraventricular Tachycardia • Sick-Sinus Syndrome • Second/Third Degree Atrioventricular Block Cardiac - Outflow Obstruction: • Aortic Stenosis • Hypertrophic Obstructive Cardiomyopathy • Pulmonary Embolus • Other Orthostatic: • Dehydration • Hypovolemia • Medications Central: • Emotional Peripheral/Situational: • Bladder Emptying • Pain • Reduced Effective Arterial Blood Volume • Carotid Sinus Syncope • Tussive • Defecation #Syncope #Neurology #Differential #Diagnosis #Algorithm #Causes
