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Somatosensory profile of patients with haemophilia.
INTRODUCTION: Patients with haemophilia (PwH) suffer from an enhanced pain sensitivity due to repetitive joint bleedings. A comprehensive, quantitative examination of the somatosensory system has not been performed in this population to date.
MATERIAL AND METHODS: Thirty patients with moderate or severe haemophilia A or B and 30 healthy controls were examined by means of Quantitative Sensory Testing to assess the function of the somatosensory system. Detection (DT) and pain thresholds (PT) were determined, amounting to a total of 13 parameters. Both knee joints and the hand as reference were examined in order to assess both joint-specific as well as general changes in the somatosensory profile.
RESULTS: Analysing DT and PT, a significant main effect was found for group × stimulus interaction (P ≤ .001). Post hoc tests revealed significant differences in DT between PwH and controls for thermal stimuli across both knees (cold DT: P < .001; warm DT: P < .01) and the hand (cold DT: P < .01; warm DT: P < .05). Mechanical DT was increased in PwH at both knee joints (left knee: P ≤ .05; right knee: P ≤ .01). Furthermore, pressure PT was decreased in PwH at both knees (P ≤ .001).
CONCLUSION: Haemophilic arthropathy leads to alterations of the somatosensory profile in PwH. Our results reveal initial evidence of a combination of peripheral sensitization, indicated by decreased pressure PT and mechanical DT at the knee joints, as well as general changes of the somatosensory system, shown by reduced thermal DT at affected sites and remote from these. Therefore, both mechanisms have to be considered regarding the pain management in PwH.
MATERIAL AND METHODS: Thirty patients with moderate or severe haemophilia A or B and 30 healthy controls were examined by means of Quantitative Sensory Testing to assess the function of the somatosensory system. Detection (DT) and pain thresholds (PT) were determined, amounting to a total of 13 parameters. Both knee joints and the hand as reference were examined in order to assess both joint-specific as well as general changes in the somatosensory profile.
RESULTS: Analysing DT and PT, a significant main effect was found for group × stimulus interaction (P ≤ .001). Post hoc tests revealed significant differences in DT between PwH and controls for thermal stimuli across both knees (cold DT: P < .001; warm DT: P < .01) and the hand (cold DT: P < .01; warm DT: P < .05). Mechanical DT was increased in PwH at both knee joints (left knee: P ≤ .05; right knee: P ≤ .01). Furthermore, pressure PT was decreased in PwH at both knees (P ≤ .001).
CONCLUSION: Haemophilic arthropathy leads to alterations of the somatosensory profile in PwH. Our results reveal initial evidence of a combination of peripheral sensitization, indicated by decreased pressure PT and mechanical DT at the knee joints, as well as general changes of the somatosensory system, shown by reduced thermal DT at affected sites and remote from these. Therefore, both mechanisms have to be considered regarding the pain management in PwH.
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