Questions • What is the cause of his blackout? • What does the ECG show?

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The most common cause of blacking out is fainting. Other causes include epileptic seizures, syncope due to anxiety (psychogenic pseudosyncope) and other rare causes of faints. Other causes of blacking out may be due to low blood sugar (hypoglycaemia) and lack of oxygen (hypoxia) from a variety of causes
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Most common cause of syncopal attack (Blackout) is great related They can be Aortic stenosis, Atrial fibrillation, Short run of arrhythmias such as WPW syndrome