Exogenous opioids influence the microcirculation of injured peripheral nerves

1997 ◽  
Vol 272 (1) ◽  
pp. H76-H82
Author(s):  
L. Schaafsma ◽  
H. Sun ◽  
D. Zochodne
Keyword(s):  
Blood Flow ◽  
Peripheral Nerve ◽  
Peripheral Nerves ◽  
Nerve Trunk ◽  
Local Blood Flow ◽  
Vasa Nervorum ◽  
Perfusion Flow ◽  
Sciatic Nerves ◽  
Microelectrode Measurements ◽  
Hydrogen Clearance

Local microvessels of peripheral nerve trunks (vasa nervorum) dilate following capsaicin-induced inflammation or local nerve trunk injury. In previous work, we observed that morphine blocked capsaicin-induced dilation of vasa nervorum presumably through the action of local opioid receptors. In the present work, we studied injury-related hyperemia of the rat sciatic vasa nervorum using laser Doppler and hydrogen clearance microelectrode measurements of local perfusion. Systemic morphine reversed hyperemia by vasoconstricting both extrinsic and intrinsic microvessels supplying 48-h-old “neuroma” preparations or crush zones of peripheral nerve trunks. Morphine did not constrict microvessels of contralateral uninjured or sham exposed but uninjured sciatic nerves. In contrast to the injured nerves, contralateral uninjured nerves exposed to morphine frequently had a rise in local perfusion, indicating vasodilation. The vasoconstrictive actions of morphine were blocked by pretreatment with naloxone and were not mimicked by saline injections alone. Systemic doses of selective opioid agonists to mu-, kappa-, and delta-receptors also selectively constricted microvessels of injured nerves. Local blood flow in older experimental neuromas at 7 days had partial sensitivity to morphine, whereas at 14 days perfusion flow was not influenced by morphine. Exogenous opioids dampen early but not later inflammatory microvasodilation and could have important influences on the nerve regenerative milieu.

Innervation of endoneurial microvessels in human sural nerve

1992 ◽  
Vol 50 (1) ◽  
pp. 920-921
Author(s):  
John L. Beggs ◽  
Peter C. Johnson ◽  
Astrid G. Olafsen ◽  
C. Jane Watkins
Keyword(s):  
Blood Flow ◽  
Blood Vessels ◽  
Blood Supply ◽  
Peripheral Nerves ◽  
Sural Nerve ◽  
Nerve Fibers ◽  
Arterial Supply ◽  
Autonomic Nerve ◽  
Vasa Nervorum ◽  
Endoneurial Blood Flow

The blood supply (vasa nervorum) to peripheral nerves is composed of an interconnected dual circulation. The endoneurium of nerve fascicles is maintained by the intrinsic circulation which is composed of microvessels primarily of capillary caliber. Transperineurial arterioles link the intrinsic circulation with the extrinsic arterial supply located in the epineurium. Blood flow in the vasa nervorum is neurogenically influenced (1,2). Although a recent hypothesis proposes that endoneurial blood flow is controlled by the action of autonomic nerve fibers associated with epineurial arterioles (2), our recent studies (3) show that in addition to epineurial arterioles other segments of the vasa nervorum are also innervated. In this study, we examine blood vessels of the endoneurium for possible innervation.

Measurement of local blood flow of the intestine by hydrogen clearance method; Experimental study

1979 ◽  
Vol 9 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Yoshio Mishima ◽  
Hiroshi Shigematsu ◽  
Yoshiaki Horie ◽  
Masanori Satoh
Keyword(s):  
Experimental Study ◽  
Blood Flow ◽  
Local Blood Flow ◽  
Hydrogen Clearance Method ◽  
Hydrogen Clearance

Waterjet Dissection of Peripheral Nerves: An Experimental Study of the Sciatic Nerve of Rats

2010 ◽  
Vol 67 (suppl_2) ◽  
pp. ons368-ons376 ◽  
Author(s):  
Christoph A. Tschan ◽  
Doerthe Keiner ◽  
Harald D. Müller ◽  
Kerstin Schwabe ◽  
Michael R. Gaab ◽  
...  
Keyword(s):  
Sciatic Nerve ◽  
Peripheral Nerve ◽  
Nerve Regeneration ◽  
Peripheral Nerves ◽  
Scar Tissue ◽  
Small Water ◽  
Peripheral Nerve Surgery ◽  
Sciatic Nerves ◽  
Nerve Surgery ◽  
Waterjet Dissection

ABSTRACT BACKGROUND: Although waterjet dissection has been well evaluated in intracranial pathologies, little is known of its qualities in peripheral nerve surgery. Theoretically, the precise dissection qualities could support the separation of nerves from adjacent tissues and improve the preservation of nerve integrity in peripheral nerve surgery. OBJECTIVE: To evaluate the potential of the new waterjet dissector in peripheral nerve surgery. METHODS: Waterjet dissection with pressures of 20 to 80 bar was applied on the sciatic nerves of 101 rats. The effect of waterjet dissection on the sciatic nerve was evaluated by clinical tests, neurophysiological examinations, and histopathological studies up to 12 weeks after surgery. RESULTS: With waterjet pressures up to 30 bar, the sciatic nerve was preserved in its integrity in all cases. Functional damaging was observed at pressures of 40 bar and higher. However, all but 1 rat in the 80 bar subgroup showed complete functional regeneration at 12 weeks after surgery. Histopathologically, small water bubbles were observed around the nerves. At 40 bar and higher, the sciatic nerves showed signs of direct nerve injury. However, all these animals showed nerve regeneration after 12 weeks, as demonstrated by histological studies. CONCLUSION: Sciatic nerves were preserved functionally and morphologically at pressures up to 30 bar. Between 40 and 80 bar, reliable functional and morphological nerve regeneration occurred. Waterjet pressures up to 30 bar might be applied safely under clinical conditions. This technique might be well suited to separate intact peripheral nerves from adjacent tumor or scar tissue. Further studies will have to show the clinical relevance of these dissection qualities.

Intraoperative fluorescent angiography with indocyanine green in surgery of peripheral nerve injuries

2021 ◽  
pp. 224-234
Author(s):  
Dmitry Vladimirovich Svistov ◽  
Dzhamaludin Magomedrasulovich Isaev ◽  
Alexey Ivanovich Gaivoronsky ◽  
Leonid Igorevich Churikov ◽  
Kirill Vladimirovich Belyakov
Keyword(s):  
Blood Flow ◽  
Peripheral Nerve ◽  
Indocyanine Green ◽  
Blood Supply ◽  
Nerve Trunk ◽  
Point Of View ◽  
Intraoperative Angiography ◽  
Surgical Interventions ◽  
The Moment ◽  
Nerve Surgery

Despite the widespread introduction of microsurgical techniques in peripheral nerve surgery, a relatively high percentage of unsatisfactory results remains. Often, when treating patients with traumatic neuropathies, the surgeon faces the problem of diastasis between the ends of the damaged nerve. As a rule, in the presence of diastasis greater than 5 cm, it is recommended to perform inter-bundle autoneuroplasty. However, overcoming diastasis less than 5 cm may be accompanied by tension of the nerve trunk, which leads to a violation of its blood supply. In this case, the outcome of the intervention may be unsatisfactory, despite the operation performed perfectly from a technical point of view. An important factor of the outcome of surgical treatment of neuropathies of various origins is the preservation of adequate blood supply to the nerve trunk in the intraoperative period. In order to assess the blood flow in the nerve trunk, the possibility of using intraoperative fluorescent angiography for reconstructive surgical interventions on nerves was considered. In patients with a complete anatomical break of the large nerve trunk, at the moment of overcoming diastasis, intraoperative angiography of the nerve trunk was performed by intravenous administration of indocyanine green, with simultaneous registration of the tension force with which the nerve trunk was affected. In addition, fluorescent angiography was performed after the restoration of the integrity of the nerve trunk, thus assessing the safety, adequacy and effectiveness of blood flow in it. It was found that intraoperative angiography is an accessible and easily implementable technique to determine the safety and, not least, the adequacy and effectiveness of the blood flow in the nerve trunk, to study the mechanisms of compensation of blood supply to the nerve after microsurgical epineural suture, and to assess the quality of matching the stumps of the nerve axis, preventing the possibility of «torsion».

scholarly journals Complex Diagnosis in Surgical Treatment of Peripheral Nerves Injuries of the Extremities

2016 ◽  
pp. 62-66
Author(s):  
V. G. Ninel’ ◽  
Sh. M. Aitemirov ◽  
G. A. Korshunova ◽  
I. A. Norkin
Keyword(s):  
Surgical Treatment ◽  
Peripheral Nerve ◽  
Peripheral Nerves ◽  
Nerve Trunk ◽  
Treatment Results

The purpose of the work was to evaluate the role and potentialities of complex diagnosis in surgical treatment of peripheral nerve trunk injuries of the extremities. Complex examination including electroneuromyography, ultrasonography and contrast neurography was performed in 109 patients with injuries of peripheral nerves of the extremities. Examination results enabled to elaborate the algorithm of diagnosis and differential surgical treatment tactics for surgical treatment of peripheral nerves injuries. Management of patients in accordance with proposed algorithm allowed to improve surgical treatment results significantly - by 21%.

scholarly journals LABEL-FREE 3D OPTICAL MICROANGIOGRAPHY IMAGING OF FUNCTIONAL VASA NERVORUM AND PERIPHERAL MICROVASCULAR TREE IN THE HIND LIMB OF DIABETIC MICE

2010 ◽  
Vol 03 (04) ◽  
pp. 307-313 ◽  
Author(s):  
YALI JIA ◽  
THOMAS K. BAUMANN ◽  
RUIKANG K. WANG
Keyword(s):  
Blood Flow ◽  
Peripheral Nerves ◽  
Hind Limb ◽  
Imaging Technique ◽  
Blood Perfusion ◽  
Diabetic Mice ◽  
Label Free ◽  
Vasa Nervorum ◽  
Optical Microangiography ◽  
Microvascular Imaging

Diabetic neuropathy (DN) is, at least in part, associated with the functional attenuation of vasa nervorum, the microvascular structure of peripheral nerves. Microvascular imaging options for vasa nervorum still remain limited. In this work, optical microangiography (OMAG), a volumetric, label-free imaging technique, is utilized for characterizing, with high resolution, blood perfusion of peripheral nerve in diabetic mice. We demonstrate that OMAG is able to visualize the structure of microvasculature and to quantify the changes of dynamic blood flow and vessel diameters during administration of vessel stimulant in both diabetic and normal mice. The results indicate the potential of OMAG to assess the blood supply of nerve involved in the pathology and treatment of DN.

scholarly journals The Impact of Aging on Vasa Nervorum, Nerve Blood Flow and Vasopressin Responsiveness

2002 ◽  
Vol 29 (2) ◽  
pp. 164-168 ◽  
Author(s):  
Mikihiro Kihara ◽  
Mitsuaki Shioyama ◽  
Kazuto Okuda ◽  
Mitsuo Takahashi
Keyword(s):  
Blood Flow ◽  
Peripheral Nerve ◽  
Arginine Vasopressin ◽  
Adult Rats ◽  
Nerve Blood Flow ◽  
Vasa Nervorum ◽  
Age Related ◽  
Rat Peripheral Nerve ◽  
Dose Response Study ◽  
The Impact

Abstract:Objective:Aging impacts microvessels in a number of tissue beds. Vasopressin acts as a vasoconstrictor in most blood vessels but may also cause vasodilation. We evaluated the role of aging and vasopressin in the regulation of nerve blood flow (NBF) in rat peripheral nerve.Methods:We undertook a dose-response study to examine the impact of aging on resting NBF and its vasoreactivity to vasopressin. Nerve blood flow was measured using microelectrode hydrogen polarography. Argininevasopressin was administered both intra-arterially and topically.Results:In young adult rats (two months old) topical epineurial application of arginine-vasopressin produced a concentration-dependent reduction of NBF (ED50= 3.8 X 10-5 mol/L). Intra-arterial arginine-vasopressin also reduced NBF. Nerve blood flow was lower in aged rats (12 months old) and less responsive to topically applied vasopressin. The aging group had significantly higher concentrations of vasopressin in plasma than did the younger group.Conclusions:The results suggest that vasopressin constricts vessels in peripheral nerve and that there is an age related decline in the vasoconstrictive response to vasopressin. There may be a reduction in receptor sensitivity in vascular smooth muscle cells in peripheral nerve with increasing age.

scholarly journals Techniques for Imaging Vascular Supply of Peripheral Nerves

2021 ◽  
Vol 16 (01) ◽  
pp. e24-e30
Author(s):  
Alec Giron ◽  
Cameron Cox ◽  
Brendan MacKay
Keyword(s):  
Peripheral Nerve ◽  
Peripheral Nerves ◽  
Potential Application ◽  
Preliminary Evidence ◽  
Vascular Supply ◽  
Nerve Reconstruction ◽  
Vasa Nervorum ◽  
Arterial Inflow ◽  
Vascular Structures

AbstractFew studies have been developed to map the vascular structures feeding peripheral nerves, with the majority using cadaveric models and inadequate sample sizes. Preliminary evidence, while limited, indicates that the mapping of these vessels may allow or preclude certain procedures in nerve reconstruction due to the location of essential arterial inflow to the vasa nervorum. This review evaluates the evidence regarding historical, current, and emerging techniques for visualizing these vascular structures in vivo and considers their potential application in peripheral nerve vasculature.

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