Myasthenic Syndrome, Congenital, 3b, Fast-Channel, is also known as congenital myasthenic syndrome 3b. An important gene associated with Myasthenic Syndrome, Congenital, 3b, Fast-Channel is CHRND (Cholinergic Receptor Nicotinic Delta Subunit). Affiliated tissues include skeletal muscle, and related phenotypes are decreased fetal movement and ptosis