title: Trigeminocardiac reflex: a unique case of recurrent asystole during bilateral trigeminal sensory root rhizotomy.
abstract: BACKGROUND
  The trigeminocardiac reflex is the sudden-onset of dysrhythmia and hypotension during manipulation of any of the branches of the trigeminal nerve. The trigeminal nerve and cardioinhibitory vagus nerve constitute the afferent and efferent pathways in the reflex arc. The trigeminocardiac reflex has been reported to occur during craniofacial surgery, balloon-compression rhizolysis of the trigeminal ganglion, and tumour resection in the cerebellopontine angle.
  
  
  METHODS
  A 2-year-old male patient with haemangioma near the sella turcica underwent rhizotomies of both sides of the dorsal sensory roots, of the trigeminal nerves for palliation of intractable trigeminal pain.
  
  
  RESULTS
  In this report, we experienced two unexpected episodes of asystole after transection of the sensory roots of the trigeminal nerves.
  
  
  CONCLUSIONS
  Sectioning of the intracranial dorsal sensory root of the trigeminal nerve provides clear evidence of the central role of the trigeminal nerve as the afferent pathway of the trigeminocardiac reflex arc.
authors.affiliation: Division of Skull Base Surgery, Los Angeles, CA 90048, USA.
authors.forename: S T
authors.initials: ST
authors.lastname: Cha
authors.forename: J B
authors.initials: JB
authors.lastname: Eby
authors.forename: J T
authors.initials: JT
authors.lastname: Katzen
authors.forename: H K
authors.initials: HK
authors.lastname: Shahinian
mesh_terms: D000368:Aged; D003388:Cranial Fossa, Posterior; D006323:Heart Arrest / Q000209:etiology*; D006391:Hemangioma / Q000150:complications; D006801:Humans; D015192:Infratentorial Neoplasms / Q000150:complications; D008297:Male; D010148:Intractable Pain / Q000209:etiology / Q000601:surgery; D012008:Recurrence; D012018:Reflex / Q000502:physiology*; D012024:Reflex, Oculocardiac / Q000502:physiology; D019051:Rhizotomy / Q000009:adverse effects*; D014276:Trigeminal Nerve / Q000502:physiology* / Q000601:surgery*; D014277:Trigeminal Neuralgia / Q000209:etiology / Q000601:surgery*