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Establishment of a method to measure length of the ulnar nerve and standardize F-wave values in clinically normal beagles.

Hirasawa S, Shimizu M, Marui Y, Kishimoto M, Okuno S - J. Vet. Med. Sci. (2014)

Bottom Line: Nerve length 2 generated the highest value.Furthermore, the anterior horn of the scapula was easily palpated in any dog regardless of well-fed body.We concluded that nerve length 2 was optimal for measuring the length of the ulnar nerve.

View Article: PubMed Central - PubMed

Affiliation: Department of Veterinary Diagnostic Imaging, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan.

ABSTRACT
We designed a new method of measuring the length of the ulnar nerve and determining standard values for F-wave parameters of the ulnar nerve in clinically normal beagles. Nerve length must be precisely measured to determine F-wave latency and conduction velocity. The length of the forelimb has served as the length of the ulnar nerve for F-wave assessments, but report indicates that F-wave latency is proportional to the length of the pathway traveled by nerve impulses. Therefore, we measured the surface distance from a stimulus point to the spinous process of the first thoracic vertebra (nerve length 1) and the anterior horn of the scapula (nerve length 2) as landmarks through the olecranon and the shoulder blade acromion. The correlation coefficients between the shortest F-wave latency and the length of nerves 1, 2 or the forelimb were 0.61, 0.7 and 0.58. Nerve length 2 generated the highest value. Furthermore, the anterior horn of the scapula was easily palpated in any dog regardless of well-fed body. We concluded that nerve length 2 was optimal for measuring the length of the ulnar nerve.

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M responses (outlined arrow) and the F-waves (solid arrow) recorded from ulnar nerveof clinically normal beagle. Recording sensitivity differs between M response andF-wave. F-wave form and latency varied. Shortest F-wave latency (black triangle) isfrom stimulus artifact (SA) to first deflection of F-wave among 32 stimuli.
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fig_002: M responses (outlined arrow) and the F-waves (solid arrow) recorded from ulnar nerveof clinically normal beagle. Recording sensitivity differs between M response andF-wave. F-wave form and latency varied. Shortest F-wave latency (black triangle) isfrom stimulus artifact (SA) to first deflection of F-wave among 32 stimuli.

Mentions: Supramaximal electrical stimuli applied to the ulnar nerve elicited detectable F-waves inall dogs. F-waves were polymorphic, and the amplitude was far smaller than that of M-waves.The latency of F-waves varied, and the shortest latency was used to calculate F-waveconduction velocity (Fig. 2Fig. 2.


Establishment of a method to measure length of the ulnar nerve and standardize F-wave values in clinically normal beagles.

Hirasawa S, Shimizu M, Marui Y, Kishimoto M, Okuno S - J. Vet. Med. Sci. (2014)

M responses (outlined arrow) and the F-waves (solid arrow) recorded from ulnar nerveof clinically normal beagle. Recording sensitivity differs between M response andF-wave. F-wave form and latency varied. Shortest F-wave latency (black triangle) isfrom stimulus artifact (SA) to first deflection of F-wave among 32 stimuli.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4300375&req=5

fig_002: M responses (outlined arrow) and the F-waves (solid arrow) recorded from ulnar nerveof clinically normal beagle. Recording sensitivity differs between M response andF-wave. F-wave form and latency varied. Shortest F-wave latency (black triangle) isfrom stimulus artifact (SA) to first deflection of F-wave among 32 stimuli.
Mentions: Supramaximal electrical stimuli applied to the ulnar nerve elicited detectable F-waves inall dogs. F-waves were polymorphic, and the amplitude was far smaller than that of M-waves.The latency of F-waves varied, and the shortest latency was used to calculate F-waveconduction velocity (Fig. 2Fig. 2.

Bottom Line: Nerve length 2 generated the highest value.Furthermore, the anterior horn of the scapula was easily palpated in any dog regardless of well-fed body.We concluded that nerve length 2 was optimal for measuring the length of the ulnar nerve.

View Article: PubMed Central - PubMed

Affiliation: Department of Veterinary Diagnostic Imaging, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan.

ABSTRACT
We designed a new method of measuring the length of the ulnar nerve and determining standard values for F-wave parameters of the ulnar nerve in clinically normal beagles. Nerve length must be precisely measured to determine F-wave latency and conduction velocity. The length of the forelimb has served as the length of the ulnar nerve for F-wave assessments, but report indicates that F-wave latency is proportional to the length of the pathway traveled by nerve impulses. Therefore, we measured the surface distance from a stimulus point to the spinous process of the first thoracic vertebra (nerve length 1) and the anterior horn of the scapula (nerve length 2) as landmarks through the olecranon and the shoulder blade acromion. The correlation coefficients between the shortest F-wave latency and the length of nerves 1, 2 or the forelimb were 0.61, 0.7 and 0.58. Nerve length 2 generated the highest value. Furthermore, the anterior horn of the scapula was easily palpated in any dog regardless of well-fed body. We concluded that nerve length 2 was optimal for measuring the length of the ulnar nerve.

Show MeSH