4.4 Article

Associations Between Resting Heart Rate, Resting Blood Pressure, Psychological Variables and Pain Processing in Chronic Whiplash-Associated Disorder: A Cross-Sectional Study

期刊

PAIN MEDICINE
卷 23, 期 11, 页码 1882-1890

出版社

OXFORD UNIV PRESS
DOI: 10.1093/pm/pnac075

关键词

Whiplash Injuries; Heart Rate; Blood Pressure; Pain Threshold; Chronic Pain; Neck Pain

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This study found no significant correlations between autonomic variables (heart rate and blood pressure) and pain processing or psychological variables in the chronic WAD group. However, a positive correlation was observed between diastolic blood pressure and cervical spine pressure pain threshold in the control group.
Objective Autonomic nervous system dysfunction has been implicated in chronic whiplash-associated disorder (WAD). However, the relationship between autonomic variables (e.g., resting heart rate and blood pressure) and clinical factors in chronic WAD is not well understood. This study sought to examine the associations between resting heart rate, resting blood pressure, pain processing and psychological variables in chronic WAD and in pain-free controls. Design Secondary analysis of a cross-sectional study. Setting University clinical research laboratory. Subjects Thirty-six people with chronic WAD Grade II (mean [SD] age 40.1 [14.6] years, 28 females) and 25 pain-free controls (35.6 [13.0] years, 17 females). Methods Participants had resting heart rate, systolic and diastolic blood pressure measured. Pain processing measures comprised: (i) pain pressure threshold at the cervical spine, hand and leg, (ii) temporal summation at the cervical spine and hand, and (iii) conditioned pain modulation. Psychological outcomes included measures of kinesiophobia, pain catastrophizing and post-traumatic stress symptoms. Correlations between autonomic variables, pain processing and psychological variables were determined (P < .05, 5% FDR). Results No significant correlations between autonomic and pain processing variables, or autonomic and psychological variables were found in the chronic WAD group. In the control group, diastolic blood pressure was positively correlated with cervical spine pressure pain threshold (r = 0.53, P = .007). Conclusions An association between blood pressure and pain sensitivity was observed in the control group but not the chronic WAD group. Such an association appears to be disrupted in chronic WAD, which may infer involvement of autonomic pathways in the pathophysiology of this condition.

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