sentences:  Other types include cardiac syncope (including long QT disorders, other cardiac arrhythmias, and structural cardiac disease), syncope due to standing (see orthostatic hypotension), hyperventilation, compulsive Valsalva maneuvers, gastroesophageal reflux disease, and imposed upper airway obstruction(suffocation).In addition, anoxic seizures are a feature of both hyperekplexia and familial rectal pain syndrome.Finally, there are likely to be other types of anoxic seizure or syncope not yet characterized.