Andersen's syndrome is a clinically distinct form of potassium-sensitive 
periodic paralysis associated with cardiac dysrhythmias. The subtle nature of 
the cardiac and dysmorphic features may delay the recognition of this syndrome 
and its potentially lethal cardiac dysrhythmias. The genetic defect in 
Andersen's syndrome is not genetically linked to other forms of 
potassium-sensitive periodic paralysis and is probably distinct from the long QT 
syndrome locus.