Related Experiment Video
Updated: Dec 25, 2025
Quantitative Autonomic Testing
Published on: July 19, 2011
Quantitative sudomotor test helps differentiate transthyretin familial amyloid polyneuropathy from chronic
E Fortanier1, E Delmont1, A Verschueren1
1Neuromuscular Disease and ALS Reference Center, Timone University Hospital, Aix-Marseille University, Marseille, France.
Objective:
Transthyretin familial amyloid polyneuropathy (TTR-FAP) is an aggressive hereditary neuropathy characterized by sensory and autonomic dysfunction. There are numerous reports of TTR-FAP misdiagnosed and treated as chronic inflammatory demyelinating polyneuropathy (CIDP), leading to delayed diagnosis, risk of iatrogenic adverse events and increased socio-economic costs. Quantitative sudomotor function measured by electrochemical skin conductance (ESC) appears to be a sensitive test in TTR-FAP. We aimed to evaluate the performance of ESC in differentiating TTR-FAP from CIDP.
Methods:
Thirty-eight patients with genetically confirmed hereditary TTR amyloidosis and 26 with definite CIDP according to the EFNS/PNS guidelines and negative TTR-FAP genetic testing were involved in this study. We compared the ESC for feet and hands measured by Sudoscan for each patient.
Results:
ESC (µS) was significantly lower in TTR-FAP for both hands (72 vs 45, p < 0.0001) and feet (77 vs 35, p < 0.0001). Feet ESC < 64 µS had a 89% sensitivity and a 96% specificity to differentiate between CIDP and TTR-FAP.
Conclusion:
Sudoscan is a fast, non-invasive and easy to perform test, able to distinguish CIDP and TTR-FAP patients with good sensitivity and specificity.
Significance:
Sudoscan can be helpful in distinguishing between CIDP and TTR-FAP.
More Related Videos
06:40Screening of Axonal Degeneration in Carpal Tunnel Syndrome Using Ultrasonography and Nerve Conduction Studies
Published on: January 11, 2019
06:49A Quick Phenotypic Neurological Scoring System for Evaluating Disease Progression in the SOD1-G93A Mouse Model of ALS
Published on: October 6, 2015
