A growing sensation of anxiety, fear of something vague, tachycardia, and effortful breathing that occurs during panic attacks may lead to loss of consciousness. In these episodes, some patients may have a parasympathetic syncope and others may hyperventilate and faint. Irrespective of the final mechanism, panic attacks are always associated with an initial sensation of anxiety. As with most neuropsychiatric conditions, panic attacks result from an interaction of genetic predisposition with environmental determinants of anxiety states.
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