Patients with symptomatic permanent atrial fibrillation show quantitative signs of pain sensitisation

Adam Jackson, Ole Frobert, Dennis Boye Larsen, Lars Arendt-Nielsen, Anna Björkenheim, Adam Jackson, Ole Frobert, Dennis Boye Larsen, Lars Arendt-Nielsen, Anna Björkenheim

Abstract

Objective: Most patients with atrial fibrillation (AF) report symptoms, while one-third are asymptomatic. We hypothesised that sensory processing, in particular pain, differs in patients with symptomatic and asymptomatic AF.

Methods: Thirty individuals with permanent AF (15 symptomatic and 15 asymptomatic) completed the Atrial Fibrillation 6 (AF6) and short form 36 Health Survey questionnaires and underwent quantitative pain sensitisation testing using pressure algometry at the sternum (referred pain area) and the tibialis anterior muscle (generalised pain area). The primary objective was to assess differences in pressure pain thresholds (PPT), temporal summation of pain (TSP) and conditioned pain modulation (CPM) in the two groups. The secondary objective was to determine association of demographic and clinical parameters to measures of pain sensitisation.

Results: The symptomatic group had lower PPTs at both tibialis (p=0.004) and sternum (p=0.01), and impaired CPM (p=0.025) and facilitated TSP (p=0.008) at the tibialis but not sternum, compared with the asymptomatic group. The AF6 sum score was negatively correlated to PPT on both tibialis (r=-0.50, p=0.005) and sternum (r=-0.42, p=0.02) and positively correlated to TSP on both tibialis (r=0.57, p=0.001) and sternum (r=0.45, p=0.01), but not to CPM. The physical component summary score was positively correlated to the PPT on both tibialis (r=0.52, p=0.003) and sternum (r=0.40, p=0.03) and negatively to TSP on the tibialis (r=-0.53, p=0.003) but not sternum.

Conclusions: Patients with symptomatic AF exhibit lower pain tolerance than patients with asymptomatic AF, as well as impaired pain inhibitory control and facilitated summation of pain, indicating that pain sensitisation may be of importance in symptomatic AF.Trial registration numberNCT04649437.

Keywords: atrial fibrillation; chest pain; obesity.

Conflict of interest statement

Competing interests: None declared.

© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

Figures

Figure 1
Figure 1
Superimposed body chart (n=4) of chest pain distribution in patients with permanent atrial fibrillation.
Figure 2
Figure 2
Pressure pain thresholds (PPTs) before and after the cold pressor test. PPTs over the tibialis anterior muscle (A) and the sternum (B) before and immediately after cold pressor test in patients with symptomatic and asymptomatic permanent atrial fibrillation (AF). Values are mean and SEM of three measurements. #, sternum and tibial PPTs differed significantly in asymptomatic and patients with symptomatic AF, p

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