TY - JOUR
T1 - Increased pain sensitivity in accident-related chronic pain patients with comorbid posttraumatic stress
AU - Vaegter, Henrik Bjarke
AU - Andersen, Tonny Elmose
AU - Harvold, Mathea
AU - Andersen, Per Grunwald
AU - Graven-Nielsen, Thomas
N1 - DNRF121
PY - 2018
Y1 - 2018
N2 - Objectives: Posttraumatic stress disorder (PTSD) is prevalent in chronic pain, and associated with increased pain, hyperalgesia, and psychological distress. This study aimed to investigate antinociceptive and pronociceptive pain mechanisms, pain intensity, and psychological distress (depression, anxiety, pain catastrophizing, and fear of movement) in patients with accident-related chronic spinal pain with (N=44) and without (N=64) comorbid PTSD characteristics. Materials and Methods: Cuff algometry was performed on lower legs to assess pressure pain threshold (cPPT), tolerance (cPTT), temporal summation of pain (increase in pain scores to 10 repeated stimulations), and conditioning pain modulation (increase in cPPT during cuff pain conditioning on the contralateral leg). Warmth detection threshold and heat pain threshold at the hand were also assessed. Clinical pain intensity (numerical rating scale), psychological distress, and PTSD symptomatology (ICD-11) were assessed with questionnaires. Mediation analyses were performed to investigate possible psychological mediators in the associations between PTSD and pain (intensity and mechanisms). Results: Patients with PTSD demonstrated increased pain intensity, and psychological distress as well as reduced warmth detection threshold and cPTT compared with patients without PTSD (P<0.05). No significant differences in cPPT, heat pain threshold, temporal summation of pain, and conditioning pain modulation were found. The association between PTSD and pain intensity was mediated by pain catastrophizing, and fear of movement mediated the association with cPTT. Discussion: The association between PTSD and pain intensity is in accordance with the mutual-maintenance and fear-Avoidance models. Future studies should investigate changes in pain intensity and mechanisms after treatment targeting comorbid PTSD in chronic pain patients.
AB - Objectives: Posttraumatic stress disorder (PTSD) is prevalent in chronic pain, and associated with increased pain, hyperalgesia, and psychological distress. This study aimed to investigate antinociceptive and pronociceptive pain mechanisms, pain intensity, and psychological distress (depression, anxiety, pain catastrophizing, and fear of movement) in patients with accident-related chronic spinal pain with (N=44) and without (N=64) comorbid PTSD characteristics. Materials and Methods: Cuff algometry was performed on lower legs to assess pressure pain threshold (cPPT), tolerance (cPTT), temporal summation of pain (increase in pain scores to 10 repeated stimulations), and conditioning pain modulation (increase in cPPT during cuff pain conditioning on the contralateral leg). Warmth detection threshold and heat pain threshold at the hand were also assessed. Clinical pain intensity (numerical rating scale), psychological distress, and PTSD symptomatology (ICD-11) were assessed with questionnaires. Mediation analyses were performed to investigate possible psychological mediators in the associations between PTSD and pain (intensity and mechanisms). Results: Patients with PTSD demonstrated increased pain intensity, and psychological distress as well as reduced warmth detection threshold and cPTT compared with patients without PTSD (P<0.05). No significant differences in cPPT, heat pain threshold, temporal summation of pain, and conditioning pain modulation were found. The association between PTSD and pain intensity was mediated by pain catastrophizing, and fear of movement mediated the association with cPTT. Discussion: The association between PTSD and pain intensity is in accordance with the mutual-maintenance and fear-Avoidance models. Future studies should investigate changes in pain intensity and mechanisms after treatment targeting comorbid PTSD in chronic pain patients.
KW - PTSD
KW - clinical pain
KW - cuff algometry
KW - experimental pain sensitivity
KW - trauma
UR - http://www.scopus.com/inward/record.url?scp=85044741379&partnerID=8YFLogxK
U2 - 10.1097/AJP.0000000000000543
DO - 10.1097/AJP.0000000000000543
M3 - Journal article
C2 - 28799972
SN - 0749-8047
VL - 34
SP - 313
EP - 321
JO - The Clinical Journal of Pain
JF - The Clinical Journal of Pain
IS - 4
M1 - 0543
ER -