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Materia Medica Viva Volume 8 – page 1846

Convulsions
Cicuta is well-known for its tendency to cause and cure convulsions and spasms of a very violent kind: clonic convulsions with frightening or ridiculous contortions of the limbs, of the facial muscles and violent jerkings of the head and limbs; tonic spasms of the most excessive degree, tetanic, each muscle perfectly rigid and hard like wood; also catalepsy with ‘flexibilitas cerea’; trismus, often with grinding of the teeth and bloody foam at the mouth, bites his tongue, etc.; long-lasting and very violent spasms of the diaphragm with much swelling in the stomach region. There are many very impressive spasmodic symptoms, and a great tendency to bend the head and back backward (opistho-tonus) is very often noted. ‘Back bent backward like an arch.’
Another convulsive phenomenon is strabismus convergent of a spasmodic kind, which may, as Kent says, ‘be the only spasm the child is subject to from cerebral irritation’. ‘Every time the child is frightened, it has strabismus; when touched or when it has cold, or after a fall hitting the head, or coming periodically, it has strabismus’.
Spasms of the pharynx and the throat are also frequent. They can be very dangerous, threatening life by arresting the respiration and completely repressing the ability to swallow. A slight injury, such as a sharp splinter of a bone or a fish bone being stuck, can trigger a severe state in a Cicuta person. It is not the injury itself, but the violent spasm that is triggered by it, that makes this state so peculiar and dangerous.
A feature of the convulsions is that they usually begin in the head region (jerking of the head, twitching around the eyes, also spasms of the pharynx with the inability to swallow), and move downward to the trunk and limbs (opposite of Cuprum); from the centre to the periphery, affecting the tips of the extremities at the end.