title: Enhanced negative feedback sensitivity of the hypothalamus-pituitary-adrenal axis in chronic myogenous facial pain.
abstract: Dysregulations of the hypothalamus-pituitary-adrenal (HPA) axis, as a physiological substrate of stress, have been observed in patients with different stress-related and chronic pain disorders. In this study, we investigated possible dysregulations of the HPA axis in patients with masticatory muscles pain. In 20 patients with myogenous facial pain and 20 healthy controls, awakening cortisol responses, i.e.cortisol rise in the first hour after awakening, as well as a short circadian free cortisol profile, i.e. four cortisol samples over 12h during the day, were assessed before and after administration of 0.5mg dexamethasone.
  
  
  RESULTS
  In comparison to controls, chronic myogenous facial pain patients showed enhanced and prolonged suppression of cortisol after the administration of 0.5mg dexamethasone. Unstimulated cortisol response (before dexamethasone-intake) to awakening and cortisol levels during the day did not differ between the groups. Dysregulation in terms of enhanced negative feedback suppression exists in chronic myogenous facial pain. These results are in line with a multifactorial etiology of chronic facial pain, shifting the perspective away from a local towards a more central etiology with dysregulations in the stress and pain modulating system.
authors.affiliation: Clinic for Masticatory Disorders, Removable Prosthodontics and Special Care Dentistry, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zurich, Zürich, Switzerland. ursula.galli@zzmk.uzh.ch
authors.forename: Ursula
authors.initials: U
authors.lastname: Galli
authors.forename: Jens
authors.initials: J
authors.lastname: Gaab
authors.forename: Dominik A
authors.initials: DA
authors.lastname: Ettlin
authors.forename: Fidel
authors.initials: F
authors.lastname: Ruggia
authors.forename: Ulrike
authors.initials: U
authors.lastname: Ehlert
authors.forename: Sandro
authors.initials: S
authors.lastname: Palla
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D000893:Anti-Inflammatory Agents; D019540:Area Under Curve; D002908:Chronic Disease; D003863:Depression / Q000209:etiology / Q000523:psychology; D003907:Dexamethasone; D005221:Fatigue / Q000209:etiology / Q000523:psychology; D005246:Feedback / Q000502:physiology; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000378:metabolism; D007030:Hypothalamo-Hypophyseal System / Q000503:physiopathology*; D008297:Male; D005222:Mental Fatigue / Q000209:etiology / Q000523:psychology; D009209:Myofascial Pain Syndromes / Q000150:complications / Q000503:physiopathology* / Q000523:psychology; D010913:Pituitary-Adrenal System / Q000503:physiopathology*; D011569:Psychiatric Status Rating Scales; D012463:Saliva / Q000378:metabolism; D012890:Sleep; D011795:Surveys and Questionnaires
chemical_list: D000893:Anti-Inflammatory Agents; D003907:Dexamethasone; D006854:Hydrocortisone