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Morphological macrovascular alterations in complex regional pain syndrome type I demonstrated by increased intima-media thickness
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Abstract
Background
Although intima-media thickness (IMT) was increased in several inflammatory diseases, studies investigating whether the inflammatory processes lead to macrovascular alteration with increased IMT in complex regional pain syndrome (CRPS) lack.
Methods
Using ultrasound (high-resolution B-mode), we compared bilaterally the IMT of the common carotid artery (CCA-IMT), the radial artery (RA-IMT), the brachial artery (BRA-IMT) and the quotient QRA/CCA, in CRPS type I (n=17), peripheral nerve injury (PNI, n=17) and pain-free controls (PFC, n=22, matched to CRPS by gender, age and traditional cardiovascular risk factors). Statistics: Spearman’s correlation, paired t-test, ANOVA (p<0.05).
Results
Compared to PFC, RA-IMT were significantly increased in both patient groups bilaterally (mean±standard deviation, CRPS affected side vs. PFC dominant side: 0.32±0.08 mm vs. 0.19±0.08 mm, p<0.001; PNI affected side vs. PFC dominant side: 0.27±0.09 mm vs. 0.19±0.08 mm, p< 0.05; CRPS non-affected side vs. PFC non-dominant side: 0.30±0.10 mm vs. 0.19±0.09 mm, p<0.001; PNI non-affected side vs. PFC non-dominant side: 0.25±0.10 mm vs. 0.19±0.09 mm, p<0.05) and QRA/CCA (CRPS affected-side vs. PFC dominant side: 0.49±0.12 vs. 0.30±0.11, p<0.001; PNI affected side vs. PFC dominant side: 0.41±0.10 vs. 0.30±0.11, p<0.05; CRPS non-affected side vs. PFC non-dominant side: 0.43±0.19 vs. 0.30±0.13, p<0.001; PNI non-affected side vs. PFC non-dominant side: 0.39±0.14 vs. 0.30±0.13, p<0.05), and BRA-IMT - only on the affected side in CRPS (CRPS: 0.42±0.06 mm vs. PFC: 0.35±0.08 mm; p<0.05). In CRPS, QRA/CCA was significantly higher on the affected side compared to PNI (p<0.05). However, only CRPS displayed within-group side-to-side differences with a significantly increased RA-IMT and QRA/CCA on the affected side (p<0.05). The CCA-IMT was comparable between all groups and sides.
Conclusions
The increased IMT of peripheral arteries in CRPS suggests ongoing inflammatory process. Until now, only endothelial dysfunction has been reported. The presented morphological macrovascular alterations might explain the treatment resistance of some CRPS patients.
Springer Science and Business Media LLC
Title: Morphological macrovascular alterations in complex regional pain syndrome type I demonstrated by increased intima-media thickness
Description:
Abstract
Background
Although intima-media thickness (IMT) was increased in several inflammatory diseases, studies investigating whether the inflammatory processes lead to macrovascular alteration with increased IMT in complex regional pain syndrome (CRPS) lack.
Methods
Using ultrasound (high-resolution B-mode), we compared bilaterally the IMT of the common carotid artery (CCA-IMT), the radial artery (RA-IMT), the brachial artery (BRA-IMT) and the quotient QRA/CCA, in CRPS type I (n=17), peripheral nerve injury (PNI, n=17) and pain-free controls (PFC, n=22, matched to CRPS by gender, age and traditional cardiovascular risk factors).
Statistics: Spearman’s correlation, paired t-test, ANOVA (p<0.
05).
Results
Compared to PFC, RA-IMT were significantly increased in both patient groups bilaterally (mean±standard deviation, CRPS affected side vs.
PFC dominant side: 0.
32±0.
08 mm vs.
0.
19±0.
08 mm, p<0.
001; PNI affected side vs.
PFC dominant side: 0.
27±0.
09 mm vs.
0.
19±0.
08 mm, p< 0.
05; CRPS non-affected side vs.
PFC non-dominant side: 0.
30±0.
10 mm vs.
0.
19±0.
09 mm, p<0.
001; PNI non-affected side vs.
PFC non-dominant side: 0.
25±0.
10 mm vs.
0.
19±0.
09 mm, p<0.
05) and QRA/CCA (CRPS affected-side vs.
PFC dominant side: 0.
49±0.
12 vs.
0.
30±0.
11, p<0.
001; PNI affected side vs.
PFC dominant side: 0.
41±0.
10 vs.
0.
30±0.
11, p<0.
05; CRPS non-affected side vs.
PFC non-dominant side: 0.
43±0.
19 vs.
0.
30±0.
13, p<0.
001; PNI non-affected side vs.
PFC non-dominant side: 0.
39±0.
14 vs.
0.
30±0.
13, p<0.
05), and BRA-IMT - only on the affected side in CRPS (CRPS: 0.
42±0.
06 mm vs.
PFC: 0.
35±0.
08 mm; p<0.
05).
In CRPS, QRA/CCA was significantly higher on the affected side compared to PNI (p<0.
05).
However, only CRPS displayed within-group side-to-side differences with a significantly increased RA-IMT and QRA/CCA on the affected side (p<0.
05).
The CCA-IMT was comparable between all groups and sides.
Conclusions
The increased IMT of peripheral arteries in CRPS suggests ongoing inflammatory process.
Until now, only endothelial dysfunction has been reported.
The presented morphological macrovascular alterations might explain the treatment resistance of some CRPS patients.
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