Sonography of Carpal Tunnel Syndrome According to Pathophysiologic Type: Conduction Block Versus Axonal Degeneration

2017 ◽  
Vol 36 (5) ◽  
pp. 993-998 ◽  
Author(s):  
Hyun Im Moon ◽  
Hee Kyu Kwon ◽  
Ahry Lee ◽  
Se Kwang Lee ◽  
Sung-Bom Pyun
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Axonal Degeneration ◽  
Conduction Block ◽  
Tunnel Syndrome ◽  
Type Conduction

scholarly journals Axonal degeneration in association with carpal tunnel syndrome

2003 ◽  
Vol 61 (1) ◽  
pp. 48-50 ◽  
Author(s):  
Marcelo Ribeiro Caetano
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Axonal Degeneration ◽  
Conduction Block ◽  
Sensory Nerve ◽  
Normal Subjects ◽  
Segmental Demyelination ◽  
Sensory Nerve Action ◽  
Tunnel Syndrome ◽  
Worse Prognosis

Median nerve entrapment in the palm to wrist segment is known as carpal tunnel syndrome (CTS). Electromyography is the best evaluation test to confirm the disease, as it shows a median reduced conduction velocity and/or conduction block; however, the usual CTS electrodiagnostic tests do not separate segmental demyelination alone from segmental demyelination plus secondary axonal degeneration. We studied 100 hands from CTS patients (classified as mild, moderate, and severe), and 50 hands from normal subjects. The median palmar sensory nerve action potential (SNAP) amplitude was measured and compared between the two groups. It would be expected that SNAP was normal if no axonal degeneration had occurred. The results showed that in mild CTS group and part of moderate CTS group SNAP amplitude was normal, whereas in severe CTS group, and part of moderate group SNAP amplitude was reduced, proving that axonal degeneration was involved. As it is well stated that axonal lesions have worse prognosis than segmental demyelinating ones, this simple test may help to preditic the CTS outcome and treatment.

Proximal slowing in carpal tunnel syndrome resulting from either conduction block or retrograde degeneration

1993 ◽  
Vol 240 (5) ◽  
pp. 287-290 ◽  
Author(s):  
Ming-Hong Change ◽  
Kwong-Kum Liao ◽  
Shih-Ping Change ◽  
Koon-Wah Kong ◽  
See-Chiu Cheung
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Conduction Block ◽  
Retrograde Degeneration ◽  
Tunnel Syndrome

scholarly journals Conduction block in carpal tunnel syndrome

Brain ◽  
1999 ◽  
Vol 122 (5) ◽  
pp. 933-941 ◽  
Author(s):  
M. C. Kiernan
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Conduction Block ◽  
Tunnel Syndrome

Frequency-dependent conduction block in carpal tunnel syndrome

2006 ◽  
Vol 33 (5) ◽  
pp. 619-626 ◽  
Author(s):  
Bradley V. Watson ◽  
William F. Brown ◽  
Timothy J. Doherty
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Conduction Block ◽  
Frequency Dependent ◽  
Tunnel Syndrome

Conduction block and segmental velocities in carpal tunnel syndrome

1997 ◽  
Vol 105 (4) ◽  
pp. 321-327 ◽  
Author(s):  
Giovanni Di Guglielmo ◽  
Filomena Torrieri ◽  
Maria Repaci ◽  
Antonino Uncini
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Conduction Block ◽  
Tunnel Syndrome

The Austrian Flag — Severe Carpal Tunnel Syndrome: A Case Report

2018 ◽  
Vol 23 (03) ◽  
pp. 412-414
Author(s):  
Konrad Mende ◽  
Michael A. Tonkin
Keyword(s):  
Case Report ◽  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Axonal Degeneration ◽  
Amyloid Deposits ◽  
Tunnel Syndrome

In severe carpal tunnel syndrome a continuum of neural changes takes place depending on the degree and duration of the compression, beginning with breakdown of the blood-nerve barrier, followed by endoneurial oedema and, subsequently, perineurial thickening and ischemia. Persisting chronic compression will eventually result in axonal degeneration. We report a case of longstanding carpal tunnel syndrome with amyloid deposits and the unusual intraoperative ‘Austrian flag’ sign.

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