Strychnine Poisoning
sardonicus - spasm of the facial muscles.[symptoma.com]
This may manifest as painful grimacing (the sardonic smile of risus sardonicus ) or back arching (opisthotonus).[lifeinthefastlane.com]
Classic signs include opisthotonus, facial trismus, and risus sardonicus.[umem.org]
Hysteria
Article navigation Research Article December 01 2016 Maggie Hennefeld maggie hennefeld is an assistant professor of cultural studies and comparative literature at the University of Minnesota. Her essays on comedy, gender and early cinema have appeared in Camera Obscura, Discourse, Early Popular Visual Culture, and[…][doi.org]
Cataplexy
Cataplexy is the sudden muscle weakness brought on by strong emotions, particularly joking, laughter, or anger. Cataplexy may involve only certain group of muscles or the entire voluntary musculature. In rare cases, symptoms of cataplexy can be seen during the course of some inherited diseases (Niemann-Pick type[…][ncbi.nlm.nih.gov]
Tetanus
A delayed diagnosis of cephalic tetanus was reached only when he was extubated and trismus and risus sardonicus were identified in addition to facial nerve palsy.[ncbi.nlm.nih.gov]
Four days after injury, he presented with muscle rigidity of his posterior neck, excessive diaphoresis, and risus sardonicus and was subsequently diagnosed with tetanus.[ncbi.nlm.nih.gov]
At 73 days of age (on 29th day of hospitalization), a clinical diagnosis of tetanus was made based on the presence of risus sardonicus, trismus, and generalized hypertonicity[ncbi.nlm.nih.gov]
Hemifacial Spasm
Hemifacial Spasm: A Neurosurgical Perspective. Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. kwanpark@skku.edu ABSTRACT Hemifacial spasm (HFS) is characterized by tonic clonic contractions of the muscles innervated by the ipsilateral facial nerve.[…][doi.org]
Gelsemium Sempervirens Poisoning
Long out of print, this is a landmark study on narcotic and psychedelic substances by a world-renowned pharmacologist and toxicologist • The first book to bring non-judgmental scientific insights to the use of drugs around the world • Provides detailed information on all major drugs of the time, including opium,[…][books.google.com]
Drug-induced Dystonia
Macroglossia The tongue does not swell, but it protrudes and feels swollen Buccolingual crisis May be accompanied by trismus, risus sardonicus, dysarthria and grimacing Laryngospasm[nps.org.au]
Macroglossia Tongue does not swell, but protrudes and feels swollen Buccolingual crisis May be accompanied by trismus, risus sardonicus (spasm of facial muscles causing grinning[bpac.org.nz]
(ii) Buccolingual crisis Features of buccolingual crisis may include: Trismus (an inability to open the mouth normally) Risus sardonicus a highly-characteristic, abnormal[rcemlearning.co.uk]
Familial Amyloid Neuropathy
It is characterised by painful spasms which manifest as lockjaw (trismus), facial contortions ( risus sardonicus ), trunkal rigidity ( opisthotonus ), and vocal cord spasms[theneurologylounge.com]
Neuromuscular Junction Disorder
. Early manifestations of generalized tetanus are rigidity of the masseter muscles (lockjaw) and facial muscles, with straightening of the upper lip or risus sardonicus[slideshare.net]
Tics
There is no justification for regarding the risus sardonicus of the ancients as a tic.[thesaurus.com]