digital artery
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Author(s):  
GyeongHyeon Doh ◽  
BumSik Kim ◽  
DongYun Lee ◽  
JungSoo Yoon ◽  
SooA Lim ◽  
...  

Purpose: Various factors such as blood velocity, turbulent flow,and intimal injury are the most basic elements in free tissue transfers. However, how blood flow is reestablished, maintained, and changed after vascular anastomosis has rarely been studied.Methods: A 54-year-old male sustained an unreplantable severe crushing injury to his right hand. The middle finger was transferred to the thumb as an ectopic replantation using an anastomosis between the radial and digital arteries. However, secondary reconstruction for the first web space defect was inevitable and an anteromedial thigh free flap procedure was performed 2 months later using the previously anastomosed vessels. During the procedures, we noted morphologic changes in the microvessels and tried to explain those phenomena by applying the principles of hemodynamics.Results: Due to the discrepancy in vascular size between the radial and digital arteries, the velocity of the blood flow in the post-anastomotic site, which was the digital artery, must have been increased by Poiseuille’s law. Supposing that the velocity through the post-anastomotic site of the digital artery was increased, the pressure exerted by that flow decreased, resulting in more shrinkage of the vessel lumen of the digital artery by Bernoulli’s principle. Pascal’s law could also be applied in confined spaces with a static flow; where there is a constant pressure, as the radius of the post-anastomotic digital artery diminishes, the tension within the digital artery’s wall also simultaneously decreases. By Laplace’s law, the post-anastomotic digital artery’s wall thickens as less tension is exerted on the wall.Conclusion: Understanding these simple flow mechanics will enable microsurgeons to better avoid the risk factors causing thrombosis, which is related to flap failure.


Author(s):  
Bauback Safa ◽  
Dong Chul Lee ◽  
Jinha Park ◽  
Sung Hoon Koh ◽  
Jin Soo Kim ◽  
...  

2021 ◽  
Vol 108 (Supplement_6) ◽  
Author(s):  
F Motiwala ◽  
S Jivan

Abstract Introduction Angioleiomyoma is an unusual, benign tumour originating from the tunica media of blood vessels. They commonly occur in the face, neck and lower limb. It is rarely found in the hand and is not considered in the differential diagnoses of painful subcutaneous hand tumours. Case Report We present a case of a 40-year-old man with a several month history of a slow growing lump on his right middle finger. He complained of pain and difficulty flexing his finger. On examination, he had a solid tumour with normal overlying skin, on the volar ulnar border of middle phalanx with altered sensation and a positive Tinel’s along the ulnar digital nerve. Ultrasound and MRI reported a highly vascular subcutaneous tumour measuring 26x14x22mm with differential diagnoses of giant cell or peripheral nerve tumour. Intra-operatively the tumour was in continuity with the ulnar digital artery and solid in consistency. Tumour excision and microsurgical repair of the digital artery was required. Histology confirmed a well-defined nodule, composed of bundles of smooth muscle surrounding ectatic blood vessels, consistent with angioleiomyoma. On follow-up the patient reported return of full range of movement without hypersensitivity or evidence of recurrence. Conclusions Angioleiomyomas in the hand are rare. It should be considered in the differential diagnoses of painful subcutaneous tumours. Ultrasound and MRI are non-specific. Treatment is successful with excision biopsy and microsurgical repair of digital artery. Microvascular instruments should be available, and the patient consented for vein graft.


JPRAS Open ◽  
2021 ◽  
Author(s):  
Seigo Suganuma ◽  
Kaoru Tada ◽  
Daisuke Yamauchi ◽  
Shingo Takagawa ◽  
Hidetoshi Yasutake ◽  
...  

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