Local anaesthesia decreases nerve growth factor induced masseter hyperalgesia

Author(s)

Costa, Yuri M. ; Exposto, Fernando G. ; Castrillon, Eduardo E. ; Conti, Paulo Cesar R. ; Bonjardim, Leonardo R. ; Svensson, Peter

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 10, n. 1, p. 11-pg., 2020-09-22.

Abstract

The aim of this investigation was to evaluate the effects of local anaesthesia on nerve growth factor (NGF) induced masseter hyperalgesia. Healthy participants randomly received an injection into the right masseter muscle of either isotonic saline (IS) given as a single injection (n=15) or an injection of NGF (n=30) followed by a second injection of lidocaine (NGF+lidocaine; n=15) or IS (NGF+IS; n=15) in the same muscle 48 h later. Mechanical sensitivity scores of the right and left masseter, referred sensations and jaw pain intensity and jaw function were assessed at baseline, 48 h after the first injection, 5 min after the second injection and 72 h after the first injection. NGF caused significant jaw pain evoked by chewing at 48 and 72 h after the first injection when compared to the IS group, but without significant differences between the NGF+lidocaine and NGF+IS groups. However, the mechanical sensitivity of the right masseter 5 min after the second injection in the NGF+lidocaine group was significantly lower than the second injection in the NGF+IS and was similar to the IS group. There were no significant differences for the referred sensations. Local anaesthetics may provide relevant information regarding the contribution of peripheral mechanisms in the maintenance of persistent musculoskeletal pain. (AU)

• FAPESP's process: 15/09913-4 - The effect of cutaneous afferents in the mechanical somatosensory profile of masticatory myofascial pain.
• Grantee: Yuri Martins Costa
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/00614-2 - Effects of experimental pain and local anesthesia on motor cortex excitability and its relationship with muscle sensitivity
• Grantee: Yuri Martins Costa
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor