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==Overview==
==Differential Diagnosis==
One the basis of stiffness it can be differentiated from:
*[[Tetanus]]
*[[Stiff man syndrome]]
*[[Meningitis]]
*[[Tardive dyskinesia]]
*[[Neuroleptic malignant syndrome]]
{| style="border: 2px solid #DCDCDC; font-size: 90%; width: 83%;"
|+ '''Differential Diagnosis of Stiffness'''
! rowspan="2" align="center" style="background:#4479BA; color: #FFFFFF;" |Disease
! colspan="3" align="center" style="background:#4479BA; color: #FFFFFF;" |Diagnosis
! rowspan="2" align="center" style="background:#4479BA; color: #FFFFFF;" |Treatment
|-
! align="center" style="background:#4479BA; color: #FFFFFF;" |Symptoms
! align="center" style="background:#4479BA; color: #FFFFFF;" |Signs
! align="center" style="background:#4479BA; color: #FFFFFF;" |Laboratory Findings
|-
| style="background: #F5F5F5; padding: 5px; text-align: center;" | [[Tetanus]]<ref name="pmid27538652">{{cite journal| author=Woldeamanuel YW, Andemeskel AT, Kyei K, Woldeamanuel MW, Woldeamanuel W| title=Case fatality of adult tetanus in Africa: Systematic review and meta-analysis. | journal=J Neurol Sci | year= 2016 | volume= 368 | issue=  | pages= 292-9 | pmid=27538652 | doi=10.1016/j.jns.2016.07.025 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=27538652  }} </ref><ref name="pmid26598719">{{cite journal| author=Thwaites CL, Loan HT| title=Eradication of tetanus. | journal=Br Med Bull | year= 2015 | volume= 116 | issue=  | pages= 69-77 | pmid=26598719 | doi=10.1093/bmb/ldv044 | pmc=4674006 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=26598719  }} </ref>
| style="background: #DCDCDC; padding: 5px;" |
*Tonic contraction of muscles between the spasmodic episodes
*[[Trismus]] or lockjaw
* [[Neck stiffness]]
* [[Swallowing difficulty]]
* Stiffening of the calf and pectoral muscle groups
| style="background: #F5F5F5; padding: 5px; text-align: center;" |
* [[Opisthotonos]]
* Leg [[extension]] with arm [[flexion]]
* [[Risus sardonicus]]
* [[respiratory distress]]
| style="background: #DCDCDC; padding: 5px;" |
* Not significant
| style="background: #DCDCDC; padding: 5px;" |
* [[Diazepam]]
* [[Magnesium]] 
* Human TIG
|-
| style="background: #F5F5F5; padding: 5px; text-align: center;" | [[Neuroleptic malignant syndrome|Neuroleptic Malignant Syndrome]] <ref name="pmid28533580">{{cite journal| author=Hosseini S, Elyasi F| title=Olanzapine-Induced Neuroleptic Malignant Syndrome. | journal=Iran J Med Sci | year= 2017 | volume= 42 | issue= 3 | pages= 306-309 | pmid=28533580 | doi= | pmc=5429500 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28533580  }} </ref><ref name="pmid28488314">{{cite journal| author=Leenhardt F, Perier D, Pinzani V, Giraud I, Villiet M, Castet-Nicolas A et al.| title=Pharmacist intervention to detect drug adverse events on admission to the emergency department: Two case reports of neuroleptic malignant syndrome. | journal=J Clin Pharm Ther | year= 2017 | volume=  | issue=  | pages=  | pmid=28488314 | doi=10.1111/jcpt.12531 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28488314  }} </ref>
| style="background: #DCDCDC; padding: 5px;" |
*History of intake of offending drugs e.g [[neuroleptics]] like:
**[[Fluphenazine]]
**[[Haloperidol]]
**[[Olanzapine]]
**[[Risperidone]]
*[[Autonomic instability]]
*[[Stiffness|Rigidity]]
*[[Disorientation]]
*[[Fever]]
| style="background: #F5F5F5; padding: 5px; text-align: center;" |
* [[Dysphagia]]
* [[Pallor]]
* [[Dyspnea]]
* [[Shuffling gait]]
* [[Agitation]]
| style="background: #DCDCDC; padding: 5px;" |
** [[Myoglobinemia]]
** Elevated [[LDH]]
** Elevated [[creatine kinase]]
** [[Hyperkalemia]]
** Elevated [[AST]] and [[ALT]]
** [[Hyperphosphatemia]]
** Elevated [[alkaline phosphatase]]
** [[Hyperuricemia]]
| style="background: #DCDCDC; padding: 5px;" |
* Supportive therapy
* Stop the offending agent
* Medical Therapy
** [[Dantrolene]]
** [[Amantadine]]
** [[Bromocriptine]]
|-
| style="background: #F5F5F5; padding: 5px;" | [[Meningitis|Viral Meningitis]]<ref name="pmid24326618">{{cite journal| author=Chow E, Troy SB| title=The differential diagnosis of hypoglycorrhachia in adult patients. | journal=Am J Med Sci | year= 2014 | volume= 348 | issue= 3 | pages= 186-90 | pmid=24326618 | doi=10.1097/MAJ.0000000000000217 | pmc=4065645 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24326618  }} </ref><ref name="pmid22880096">{{cite journal| author=Leen WG, Willemsen MA, Wevers RA, Verbeek MM| title=Cerebrospinal fluid glucose and lactate: age-specific reference values and implications for clinical practice. | journal=PLoS One | year= 2012 | volume= 7 | issue= 8 | pages= e42745 | pmid=22880096 | doi=10.1371/journal.pone.0042745 | pmc=3412827 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=22880096  }} </ref><ref name="pmid15319091">{{cite journal| author=Tyler KL| title=Herpes simplex virus infections of the central nervous system: encephalitis and meningitis, including Mollaret's. | journal=Herpes | year= 2004 | volume= 11 Suppl 2 | issue=  | pages= 57A-64A | pmid=15319091 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15319091  }} </ref>
| style="background: #DCDCDC; padding: 5px;" |
* [[Fever]]
* [[Irritability]]
* Lack of appetite
* [[Lethargy]]
* Disoriented
* High grade [[fever]]
* Severe [[headache]]
* [[Stiff neck]]
* [[Photophobia|Sensitivity to bright light]]
* [[Nausea]]
* [[Vomiting]]
| style="background: #F5F5F5; padding: 5px;" |
*[[Headache]]
*[[Photophobia]]
*Phonophopia
*[[Pharyngitis]] in case of [[enterovirus]] infeciton
*[[Orchitis]] (In mumps)
*[[Vesicular]] or [[macular]] [[skin rash]]
*[[Petechia|Petichiae]]
*[[Nuchal rigidity]]
*Signs of [[meningeal irritation]]:
**[[Kernig's sign]]
**[[Brudzinski's sign]]
*[[Altered mental status]]
*[[Hypotonia]]
| style="background: #DCDCDC; padding: 5px;" |
*[[CSF]] / [[plasma glucose]] ratio (>0.6)
*[[Lactate]] (mmols/l) (<2.1)
*[[Lymphocytes]] > [[granulocytes]]
| style="background: #DCDCDC; padding: 5px;" |
* Supportive
** [[Analgesics]] for [[pain]].
** [[Acetaminophen]] for [[fever]].
* Anti-viral therapy:
** [[Acyclovir]]
** [[Pleconaril]]
|-
| style="background: #F5F5F5; padding: 5px; text-align: center;" | [[Stiff man syndrome]]
| style="background: #DCDCDC; padding: 5px;" |
* Marked rigidity
* [[Spasms]]
** Intermittent
** Painful
** Absent during sleep
| style="background: #F5F5F5; padding: 5px; text-align: center;" |
* [[Diaphoresis]]
* [[Arterial hypertension]]
* [[Tachypnea]]
* [[Cyanosis]]
* [[Apnea]], [[tachypnea]]
* [[Respiratory arrest]]
* Dilatation of the pupils
* [[Tachycardia]]
| style="background: #DCDCDC; padding: 5px;" |
* [[CSF]] has
** Elevated [[IgG]]
** [[Oligoclonal bands]]
* Positive anti-GAD antibodies
* Elevated [[creatine kinase]]
* Normal CBC & ESR
| style="background: #DCDCDC; padding: 5px;" |
* [[Benzodiazepines]]
* B[[Baclofen|aclofen]]
* [[Vigabatrin]] 
* [[Valproic Acid]], [[Neurontin]]
* Injected [[botulinum toxin]] 
* [[Prednisone]], [[plasmapheresis]], [[IVIG]] ( some success)
|-
| style="background: #F5F5F5; padding: 5px; text-align: center;" | [[Drug]] induced  [[Tardive dyskinesia|(Tardive dyskinesia]])<ref name="pmid28552340">{{cite journal| author=Deng ZD, Li DY, Zhang CC, Pan YX, Zhang J, Jin H et al.| title=Long-term follow-up of bilateral subthalamic deep brain stimulation for refractory tardive dystonia. | journal=Parkinsonism Relat Disord | year= 2017 | volume=  | issue=  | pages=  | pmid=28552340 | doi=10.1016/j.parkreldis.2017.05.010 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28552340  }} </ref><ref name="pmid28520698">{{cite journal| author=| title=Valbenazine (Ingrezza) for tardive dyskinesia. | journal=Med Lett Drugs Ther | year= 2017 | volume= 59 | issue= 1521 | pages= 83-84 | pmid=28520698 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28520698  }} </ref><ref name="pmid28510661">{{cite journal| author=Voelker R| title=Tardive Dyskinesia Drug Approved. | journal=JAMA | year= 2017 | volume= 317 | issue= 19 | pages= 1942 | pmid=28510661 | doi=10.1001/jama.2017.5537 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28510661  }} </ref>
| style="background: #DCDCDC; padding: 5px;" |
*History of intake of the offending drug for at least one month
**[[Neuroleptics]] ([[antipsychotics]])
**[[Metoclopramide]]
*Eye deviation
*Head and neck jerky movements
*No tonic contraction of the muscles between the spasms
| style="background: #F5F5F5; padding: 5px; text-align: center;" |
* [[Dyskinesia]] of the tongue and lips
* [[Dyskinesia]] of the limbs
* [[Dyskinesia]] of the neck
| style="background: #DCDCDC; padding: 5px;" |
* It is a clinical diagnosis depending on
** [[Dyskinetic|Dyskinetic movements]]
** Hx of > 1 month of [[Antipsychotics|antipsychotic]] use
* Labs may be done to rule out other differentials
| style="background: #DCDCDC; padding: 5px;" |
* Stop the offending agent
* [[Benztropine]]
* [[Benzodiazepines]]
* Injection of [[botulinum toxin]]
* Valbenzine
* [[Tetrabenazine]]
|-
| style="background: #F5F5F5; padding: 5px; text-align: center;" | [[Strychnine poisoning]]<ref>{{Cite journal
| author = [[Charlotte Duverneuil]], [[Geoffroy Lorin de la Grandmaison]], [[Philippe de Mazancourt]] & [[Jean-Claude Alvarez]]
| title = Liquid chromatography/photodiode array detection for determination of strychnine in blood: a fatal case report
| journal = [[Forensic science international]]
| volume = 141
| issue = 1
| pages = 17–21
| year = 2004
| month = April
| doi = 10.1016/j.forsciint.2003.12.010
| pmid = 15066709
}}</ref><ref>{{Cite journal
| author = [[B. A. Smith]]
| title = Strychnine poisoning
| journal = [[The Journal of emergency medicine]]
| volume = 8
| issue = 3
| pages = 321–325
| year = 1990
| month = May-June
| pmid = 2197324
}}</ref><ref>{{Cite journal
| author = [[B. J. Maron]], [[J. R. Krupp]] & [[B. Tune]]
| title = Strychnine poisoning successfully treated with diazepam
| journal = [[The Journal of pediatrics]]
| volume = 78
| issue = 4
| pages = 697–699
| year = 1971
| month = April
| pmid = 5547830
}}</ref><ref>{{Cite journal
| author = [[B. Oberpaur]], [[A. Donoso]], [[C. Claveria]], [[C. Valverde]] & [[M. Azocar]]
| title = Strychnine poisoning: an uncommon intoxication in children
| journal = [[Pediatric emergency care]]
| volume = 15
| issue = 4
| pages = 264–265
| year = 1999
| month = August
| pmid = 10460082
}}</ref>
   
| style="background: #DCDCDC; padding: 5px;" |
*Hx of up to date tetanus immunizations
*History of intentional or accidental intake
**''Strychnos nux vomica seeds''
**Rodenticide
| style="background: #F5F5F5; padding: 5px; text-align: center;" |
* Hypervigilance
* Anxiety
* Mydriasis
* Hypereflexia
* Clonus
* Facial and neck stiffness
| style="background: #DCDCDC; padding: 5px;" |
* Blood assay
* Tissue assay
* Urine assay
| style="background: #DCDCDC; padding: 5px;" |
* Initial stabilization
* High dose [[Benzodiazepines]]
* Intubation and airway securing
|-
| style="background: #F5F5F5; padding: 5px; text-align: center;" | [[Hypocalcaemia]]<ref name="pmid27065735">{{cite journal| author=Chhabra P, Rana SS, Sharma V, Sharma R, Bhasin DK| title=Hypocalcemic tetany: a simple bedside marker of poor outcome in acute pancreatitis. | journal=Ann Gastroenterol | year= 2016 | volume= 29 | issue= 2 | pages= 214-20 | pmid=27065735 | doi=10.20524/aog.2016.0015 | pmc=4805743 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=27065735  }} </ref><ref name="pmid24171002">{{cite journal| author=Desai M, Kolla PK, Reddy PL| title=Calcium unresponsive hypocalcemic tetany: gitelman syndrome with hypocalcemia. | journal=Case Rep Med | year= 2013 | volume= 2013 | issue=  | pages= 197374 | pmid=24171002 | doi=10.1155/2013/197374 | pmc=3792521 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24171002  }} </ref>
| style="background: #DCDCDC; padding: 5px;" |
**[[Muscle]] [[twitching]] and [[cramping]]
**Circumoral and extremity [[paresthesia]] or [[tingling]]
** [[Altered mental status]]
** [[Irritability]]
** [[Depression]]
** [[Psychosis]]
** [[Seizure]]
| style="background: #F5F5F5; padding: 5px; text-align: center;" |
** [[Tetany (medical sign)|Tetany]] (carpopedal spasm)
** Latent tetany
*** [[Trousseau sign of latent tetany]] 
*** [[Chvostek's sign]] 
** Hyperactive tendon reflexes
| style="background: #DCDCDC; padding: 5px;" |
* Decreased blood [[calcium]] levels
| style="background: #DCDCDC; padding: 5px;" |
* Two [[Ampule|ampules]] of [[intravenous]] [[calcium gluconate]] 10% is given slowly in a period of 10 minutes, or
* If hypocalcemia is severe, [[calcium chloride]] is given instead
* Maintenance doses of both calcium and [[vitamin-D]]
|-
| style="background: #F5F5F5; padding: 5px; text-align: center;" | [[Dental abscess]]<ref name="pmid28317564">{{cite journal| author=Ogle OE| title=Odontogenic Infections. | journal=Dent Clin North Am | year= 2017 | volume= 61 | issue= 2 | pages= 235-252 | pmid=28317564 | doi=10.1016/j.cden.2016.11.004 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=28317564  }} </ref><ref name="pmid27930461">{{cite journal| author=Bertossi D, Barone A, Iurlaro A, Marconcini S, De Santis D, Finotti M et al.| title=Odontogenic Orofacial Infections. | journal=J Craniofac Surg | year= 2017 | volume= 28 | issue= 1 | pages= 197-202 | pmid=27930461 | doi=10.1097/SCS.0000000000003250 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=27930461  }} </ref>
| style="background: #DCDCDC; padding: 5px;" |
* Tooth pain
* Painful eating and chewing
* [[Fever]]
| style="background: #F5F5F5; padding: 5px; text-align: center;" |
* Poor oral hygiene
* Presence of a dental infection
* Swollen gums
* No progression of spasm with time
* Cheek swelling
| style="background: #DCDCDC; padding: 5px;" |
* Clinical diagnosis
* Labs may include
** Microscopic exam of stained smear
** Culture of oral swab
** Blood culture
| style="background: #DCDCDC; padding: 5px;" |
* Improved dental hygiene
** Use of fluoridated water
** Brushing regularly
* [[Antibiotics]]
* Dental extraction in case of severity
|-
| style="background: #F5F5F5; padding: 5px; text-align: center;" | [[Parkinson's disease]]<ref name="pmid11402154">{{cite journal| author=Olanow CW, Watts RL, Koller WC| title=An algorithm (decision tree) for the management of Parkinson's disease (2001): treatment guidelines. | journal=Neurology | year= 2001 | volume= 56 | issue= 11 Suppl 5 | pages= S1-S88 | pmid=11402154 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11402154  }} </ref><ref name="pmid24756517">{{cite journal| author=Connolly BS, Lang AE| title=Pharmacological treatment of Parkinson disease: a review. | journal=JAMA | year= 2014 | volume= 311 | issue= 16 | pages= 1670-83 | pmid=24756517 | doi=10.1001/jama.2014.3654 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24756517  }} </ref>
| style="background: #DCDCDC; padding: 5px;" |
* [[Stiffness]]
* Inability to write
* Jerky movements at rest
* [[Constipation]]
* Sleeping difficulty
* Walking difficulty
| style="background: #F5F5F5; padding: 5px; text-align: center;" |
* [[Tremor]]
* Rigidity
* [[Bradykinesia]]
* [[Postural instability]]
* Shuffling gait
| style="background: #DCDCDC; padding: 5px;" |
* Clinical diagnosis
* Improvement with dopaminergic therapy confirms diagnosis
| style="background: #DCDCDC; padding: 5px;" |
* Symptomatic therapy
* [[Dopamine agonists]]
* [[Levodopa]]
* [[Amantadine]]
* [[MAO inhibitors]]
* COMT inhibitors
* [[Anticholinergics]]
|}


==References==
==References==

Revision as of 20:46, 12 June 2017

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Overview

Differential Diagnosis

One the basis of stiffness it can be differentiated from:


Differential Diagnosis of Stiffness
Disease Diagnosis Treatment
Symptoms Signs Laboratory Findings
Tetanus[1][2]
  • Not significant
Neuroleptic Malignant Syndrome [3][4]
Viral Meningitis[5][6][7]
Stiff man syndrome
  • Marked rigidity
  • Spasms
    • Intermittent
    • Painful
    • Absent during sleep
Drug induced (Tardive dyskinesia)[8][9][10]
  • History of intake of the offending drug for at least one month
  • Eye deviation
  • Head and neck jerky movements
  • No tonic contraction of the muscles between the spasms
Strychnine poisoning[11][12][13][14]
  • Hx of up to date tetanus immunizations
  • History of intentional or accidental intake
    • Strychnos nux vomica seeds
    • Rodenticide
  • Hypervigilance
  • Anxiety
  • Mydriasis
  • Hypereflexia
  • Clonus
  • Facial and neck stiffness
  • Blood assay
  • Tissue assay
  • Urine assay
  • Initial stabilization
  • High dose Benzodiazepines
  • Intubation and airway securing
Hypocalcaemia[15][16]
Dental abscess[17][18]
  • Tooth pain
  • Painful eating and chewing
  • Fever
  • Poor oral hygiene
  • Presence of a dental infection
  • Swollen gums
  • No progression of spasm with time
  • Cheek swelling
  • Clinical diagnosis
  • Labs may include
    • Microscopic exam of stained smear
    • Culture of oral swab
    • Blood culture
  • Improved dental hygiene
    • Use of fluoridated water
    • Brushing regularly
  • Antibiotics
  • Dental extraction in case of severity
Parkinson's disease[19][20]
  • Clinical diagnosis
  • Improvement with dopaminergic therapy confirms diagnosis


References

  1. Woldeamanuel YW, Andemeskel AT, Kyei K, Woldeamanuel MW, Woldeamanuel W (2016). "Case fatality of adult tetanus in Africa: Systematic review and meta-analysis". J Neurol Sci. 368: 292–9. doi:10.1016/j.jns.2016.07.025. PMID 27538652.
  2. Thwaites CL, Loan HT (2015). "Eradication of tetanus". Br Med Bull. 116: 69–77. doi:10.1093/bmb/ldv044. PMC 4674006. PMID 26598719.
  3. Hosseini S, Elyasi F (2017). "Olanzapine-Induced Neuroleptic Malignant Syndrome". Iran J Med Sci. 42 (3): 306–309. PMC 5429500. PMID 28533580.
  4. Leenhardt F, Perier D, Pinzani V, Giraud I, Villiet M, Castet-Nicolas A; et al. (2017). "Pharmacist intervention to detect drug adverse events on admission to the emergency department: Two case reports of neuroleptic malignant syndrome". J Clin Pharm Ther. doi:10.1111/jcpt.12531. PMID 28488314.
  5. Chow E, Troy SB (2014). "The differential diagnosis of hypoglycorrhachia in adult patients". Am J Med Sci. 348 (3): 186–90. doi:10.1097/MAJ.0000000000000217. PMC 4065645. PMID 24326618.
  6. Leen WG, Willemsen MA, Wevers RA, Verbeek MM (2012). "Cerebrospinal fluid glucose and lactate: age-specific reference values and implications for clinical practice". PLoS One. 7 (8): e42745. doi:10.1371/journal.pone.0042745. PMC 3412827. PMID 22880096.
  7. Tyler KL (2004). "Herpes simplex virus infections of the central nervous system: encephalitis and meningitis, including Mollaret's". Herpes. 11 Suppl 2: 57A–64A. PMID 15319091.
  8. Deng ZD, Li DY, Zhang CC, Pan YX, Zhang J, Jin H; et al. (2017). "Long-term follow-up of bilateral subthalamic deep brain stimulation for refractory tardive dystonia". Parkinsonism Relat Disord. doi:10.1016/j.parkreldis.2017.05.010. PMID 28552340.
  9. "Valbenazine (Ingrezza) for tardive dyskinesia". Med Lett Drugs Ther. 59 (1521): 83–84. 2017. PMID 28520698.
  10. Voelker R (2017). "Tardive Dyskinesia Drug Approved". JAMA. 317 (19): 1942. doi:10.1001/jama.2017.5537. PMID 28510661.
  11. Charlotte Duverneuil, Geoffroy Lorin de la Grandmaison, Philippe de Mazancourt & Jean-Claude Alvarez (2004). "Liquid chromatography/photodiode array detection for determination of strychnine in blood: a fatal case report". Forensic science international. 141 (1): 17–21. doi:10.1016/j.forsciint.2003.12.010. PMID 15066709. Unknown parameter |month= ignored (help)
  12. B. A. Smith (1990). "Strychnine poisoning". The Journal of emergency medicine. 8 (3): 321–325. PMID 2197324. Unknown parameter |month= ignored (help)
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