Visualization of the diaphragm muscle with ultrasound improves diagnostic accuracy of phrenic nerve conduction studies

2014 ◽  
Vol 49 (5) ◽  
pp. 669-675 ◽  
Author(s):  
Nicholas E. Johnson ◽  
Michael Utz ◽  
Erica Patrick ◽  
Nicole Rheinwald ◽  
Marlene Downs ◽  
...  
Keyword(s):  
Diagnostic Accuracy ◽  
Phrenic Nerve ◽  
Nerve Conduction ◽  
Nerve Conduction Studies ◽  
Diaphragm Muscle

scholarly journals Relationship between nerve conduction studies and the Functional Dexterity Test in workers with carpal tunnel syndrome

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Francesco Sartorio ◽  
Francesca Dal Negro ◽  
Elisabetta Bravini ◽  
Giorgio Ferriero ◽  
Stefano Corna ◽  
...  
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Diagnostic Accuracy ◽  
Carpal Tunnel ◽  
Nerve Conduction ◽  
High Specificity ◽  
Nerve Conduction Studies ◽  
Likelihood Ratios ◽  
Discriminative Ability ◽  
Convenience Sample ◽  
Tunnel Syndrome

Abstract Background Dexterity impairments caused by carpal tunnel syndrome (CTS) make working and daily activities challenging. We aimed to investigate: i) the relationship between dexterity and nerve conduction studies (NCS) in workers with classic symptoms presentation; ii) the ability of the Functional Dexterity Test (FDT) to discriminate different levels of CTS severity as classified by NCS; iii) the diagnostic accuracy of a clinical battery composed of the FDT, Phalen’s test and Tinel’s sign. Methods In a convenience sample of individuals diagnosed with CTS, we correlated FDT net scores with the NCS-based classification by means of Spearman’s (rho) test. Discriminative ability of the FDT was assessed by ANOVA, and a ROC curve determined cutoff thresholds. Sensitivity, specificity, and likelihood ratios (LRs) were used to investigate the diagnostic accuracy of the clinical battery. Results Data from 180 hands were collected. The FDT was significantly correlated (rho = 0.25, p <  0.001) with NCS. The FDT was able to discriminate subjects with severe/extreme NCS findings, and two thresholds (0.29–0.36) were identified. Adding the FDT to the provocative tests improved the overall diagnostic accuracy (specificity: 0.97, CI95% 0.83–0.99; LR+: 14.49, CI95% 2.09–100.53). Conclusions Sensorimotor impairments related to CTS can affect hand dexterity. The FDT discriminated patients with severe NCS involvement. Positive results on the clinical battery (Phalen, Tinel, and FDT) could help to confirm the CTS diagnosis, showing a very high specificity and LR+. On the contrary, the low sensitivity is not able to rule out CTS in individuals with negative results.

Phrenic nerve conduction studies as a biomarker of respiratory insufficiency in amyotrophic lateral sclerosis

2015 ◽  
Vol 17 (3-4) ◽  
pp. 213-220 ◽  
Author(s):  
J. A. Liberty Jenkins ◽  
Sarada Sakamuri ◽  
Jonathan S. Katz ◽  
Dallas A. Forshew ◽  
Lee Guion ◽  
...  
Keyword(s):  
Amyotrophic Lateral Sclerosis ◽  
Respiratory Insufficiency ◽  
Phrenic Nerve ◽  
Nerve Conduction ◽  
Nerve Conduction Studies ◽  
Lateral Sclerosis

Phrenic nerve conduction studies

1992 ◽  
Vol 15 (5) ◽  
pp. 597-603 ◽  
Author(s):  
Michale R. Swenson ◽  
Robert S. Rubenstein
Keyword(s):  
Phrenic Nerve ◽  
Nerve Conduction ◽  
Nerve Conduction Studies

Phrenic nerve conduction studies in spinal cord injury: Applications for diaphragmatic pacing

2008 ◽  
Vol 38 (6) ◽  
pp. 1546-1552 ◽  
Author(s):  
Amer Alshekhlee ◽  
Raymond P. Onders ◽  
Tanvir U. Syed ◽  
Maryjo Elmo ◽  
Bashar Katirji
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Phrenic Nerve ◽  
Nerve Conduction ◽  
Nerve Conduction Studies ◽  
Cord Injury

scholarly journals Cervical spondylosis as a possible hidden reason beyond delayed phrenic nerve distal motor latency

2021 ◽  
Vol 48 (1) ◽  
Author(s):  
Rowaida Hamdy Ali ◽  
Mai Mohamed Farouk ◽  
Salwa Galal Moussa
Keyword(s):  
Phrenic Nerve ◽  
Nerve Conduction ◽  
Cervical Spondylosis ◽  
Nerve Conduction Studies ◽  
Control Group ◽  
Distal Motor Latency ◽  
Motor Latency ◽  
Significant Prolongation ◽  
Significant Difference ◽  
Phrenic Nerves

Abstract Background Cervical spondylosis is a chronic degenerative condition of the cervical spine that can affect the cervical nerve roots. The origin of the phrenic nerve makes it vulnerable to injury. The purpose of this study is to investigate possible subtle phrenic nerve affection in patients with cervical spondylosis using nerve conduction studies (NCS). This study was conducted on 30 patients with cervical spondylosis above C5 and on 30 healthy volunteers. Nerve conduction studies of both phrenic nerves were performed in all cases. Results The patients with cervical spondylosis showed a statistically highly significant prolongation of phrenic nerve distal motor latency (DML) than the control group (P < 0.01). There was no significant difference regarding amplitude (P > 0.05). There was a significant correlation between DML and X-ray score (r < 0.05). Conclusions Cervical spondylosis is an underestimated cause of phrenic nerve delayed DML. There is a correlation between the delay of phrenic nerve DML and the severity of cervical spondylosis.

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