This term describes the initial semiology of the seizure without specifying whether the onset is focal or generalized. Thus it can be used for coding atonic seizures when the onset is not known.

peter

2010-07-10T03:13:06Z

Atonic seizure is a type of motor seizure characterized by a sudden loss or diminution of muscle tone without apparent preceding myoclonic or tonic event lasting about 1 to 2 seconds, involving head, trunk, jaw, or limb musculature.

HP:0002124

Atonic seizures

Drop seizures

Astatic seizures

Hypotonic seizure

Drop attacks

Astatic seizure

human_phenotype

Hypotonic seizures

Sudden loss of muscle tone

HP:0010819

http://purl.obolibrary.org/obo/hp.owl

https://www.epilepsydiagnosis.org/seizure/atonic-overview.html

http://www.case.edu/EpSO.owl#AtonicSeizure