The Experts below are selected from a list of 381 Experts worldwide ranked by ideXlab platform

Steven F. Morris - One of the best experts on this subject based on the ideXlab platform.

  • reversed Dorsal digital and metacarpal island flaps supplied by the Dorsal Cutaneous Branches of the palmar digital artery
    Annals of Plastic Surgery, 2001
    Co-Authors: Daping Yang, Steven F. Morris
    Abstract:

    The Dorsal digital and metacarpal island flaps have been described for use in a variety of clinical situations. On the basis of the authors' previous angiographic studies, these two skin flaps were planned on the dorsum of the proximal phalanx or intermetacarpal space based on the vascular anastomoses between the proximal Dorsal Cutaneous Branches of the palmar digital artery and the Dorsal digital Branches of the Dorsal metacarpal artery at the level of the proximal phalanx. The authors present a series of 13 patients using these flaps. To reconstruct the injured finger pulp, the reverse Dorsal digital flap was used in 5 patients, and the reverse Dorsal metacarpal flap was used in 8 patients. Most of the 13 patients sustained a work-related injury. Associated injuries of bone, joint, or tendon occurred in most patients. In all patients, the skin defect was located distal to the proximal interphalangeal joint. The skin paddle was taken from the Dorsal aspect of the middle and ring fingers or the first, second, third, and fourth metacarpal area. All flaps survived completely. Two patients who had the Dorsal branch of the sensitive radial nerve anastomosed to the digital nerve recovered 6-mm two-point discrimination in the reverse Dorsal digital flap. The results of this anatomic study and the authors' clinical experience confirm the reliability of the Dorsal digital and metacarpal island flaps.

  • Vascular basis of Dorsal digital and metacarpal skin flaps.
    The Journal of hand surgery, 2001
    Co-Authors: Daping Yang, Steven F. Morris
    Abstract:

    We studied the vascular anatomy of Dorsal digital skin flaps and the vascular anastomoses between the Dorsal Cutaneous branch of the palmar digital artery (PDA) and the Dorsal digital Branches (the terminal Branches) of the Dorsal metacarpal artery (DMA) at the level of the proximal phalanx. Eight fresh cadavers (16 hands) were injected with a lead oxide-gelatin mixture. Our radiographic assessment revealed that there were 2 sources of the arterial supply to the dorsum of the digit, the Dorsal digital Branches of the DMA, and the Dorsal Cutaneous Branches of the PDA. These Branches anastomose with each other. A flap including the territory of the Dorsal Cutaneous Branches of the PDA and a part of the territory of the DMA can be harvested on the Dorsal aspect of the proximal and middle phalanges. The extended neurovascular island flap, based on the PDA and the Dorsal branch of digital nerve, can be transposed to the volar surface of an adjacent finger resurfacing the entire length of the digit.

Yan Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Local effects of octreotide on glutamate-evoked activation of Aδ and C afferent fibers in rat hairy skin
    Brain research, 2010
    Co-Authors: Rong Luo, Yuan Guo, Dong-yuan Cao, Joel G. Pickar, Jun Wang, Yan Zhao
    Abstract:

    Abstract The aim of the present study was to investigate whether local application of octreotide, an analogue of somatostatin, suppresses the glutamate-evoked activities of Aδ and C primary afferent fibers innervating Dorsal hairy skin of the rat in vivo. The single unit activity of Aδ and C afferent fibers was recorded in isolated filaments from the Dorsal Cutaneous Branches of the T9–T12 spinal nerves. Changes in discharge relative to baseline during injection of glutamate (0.3 mM, 10 μL) into the receptive field with pretreatment by octreotide (20 μM, 10 μL) were compared with injection after pretreatment with normal saline. Most of Aδ fibers (21/27, 78%) and C fibers (21/26, 81%) in the Dorsal Cutaneous Branches were significantly activated by local injection of glutamate following saline injection. The mean discharge rates increased from 2.39 ± 0.30 and 2.42 ± 0.37 impulses/min to 12.79 ± 2.04 and 13.56 ± 2.56 impulses/min during injection of glutamate for Aδ and C fibers, respectively. After octreotide pretreatment group, glutamate increased the mean discharge rates from 1.93 ± 0.38 and 2.25 ± 0.29 impulses/min to 6.11 ± 0.9 and 6.31 ± 1.18 impulses/min in Aδ fibers and C fibers, respectively. The discharge rates during injection of glutamate after octreotide pretreatment were significantly lower than after normal saline pretreatment. The suppressive effect of octreotide was reversed by the somatostatin receptor antagonist cyclo-somatostatin. These results suggest that interactions between excitatory amino acid and inhibitory neuropeptides may contribute to sensory signaling in the peripheral nervous system.

  • Somatostatin inhibits activation of Dorsal Cutaneous primary afferents induced by antidromic stimulation of primary afferents from an adjacent thoracic segment in the rat
    Brain research, 2008
    Co-Authors: Yuan Guo, Hui-sheng Wang, Dong-yuan Cao, Joel G. Pickar, Fanrong Yao, Qi Zhang, Yan Zhao
    Abstract:

    Abstract To investigate the effect of somatostatin on the cross-excitation between adjacent primary afferent terminals in the rats, we recorded single unit activity from distal cut ends of Dorsal Cutaneous Branches of the T10 and T12 spinal nerves in response to antidromic stimulation of the distal cut end of the T11 Dorsal root in the presence and absence of somatostatin and its receptor antagonist applied to the receptive field of the recorded nerve. Afferent fibers were classified based upon their conduction velocity. Mean mechanical thresholds decreased and spontaneous discharge rates increased significantly in C and Aδ but not Aβ fibers of the T10 and T12 spinal nerves in both male and female rats following antidromic electrical stimulation (ADES) of the Dorsal root from adjacent spinal segment (DRASS) indicating cross-excitation of thin fiber afferents. The cross-excitation was not significantly different between male and female rats. Microinjection of somatostatin into the receptive field of recorded units inhibited the cross-excitation. This inhibitory effect, in turn, was reversed by the somatostation receptor antagonist cyclo-somatostatin (c-SOM). Application of c-SOM alone followed by ADES of DRASS significantly decreased the mechanical thresholds and increased the discharge rates of C and Aδ fibers, indicating that endogenous release of somatostatin plays a tonic inhibitory role on the cross-excitation between peripheral nerves. These results suggest that somatostatin could inhibit the cross-excitation involved in peripheral hyperalgesia and have a peripheral analgesic effect.

  • Effects of electrical stimulation of the Dorsal Cutaneous Branches of spinal nerves on the discharge activity of remote mechanoreceptive units in rats
    Sheng li xue bao : [Acta physiologica Sinica], 2002
    Co-Authors: Jun Jia, Yan Zhao, Wen-chun Shi, Hui-sheng Wang, Yuan Guo
    Abstract:

    The method of isolating filaments of the Dorsal Cutaneous Branches was used to observe the effects of antidromic electrical stimulation of the spinal nerves on the discharge of remote A delta and C mechanoreceptive units in rats. Seventy-nine mechanoreceptive units were recorded from the T12 nerve filaments after stimulation of the Dorsal Cutaneous Branches of T9 spinal nerve. It was found that the discharge frequency of 59.3% (16/27) A delta-units and 71.2% (37/52) C-units significantly increased during 90-120 s after the stimulation. Sixty-four mechanoreceptive units were recorded from the T12 nerve filaments after stimulation of the Dorsal Cutaneous Branches of T8 spinal nerves. The discharge frequency of 47.8% (11/23) A delta-units and 36.6% (15/41) C-units significantly increased during 120-150 s after the stimulation. In addition, the threshold of the majority of these mechanoreceptors (78.3%, 18/23) decreased after the stimulation. The results suggest that antidromic electrical stimulation of the Dorsal Cutaneous Branches of spinal nerves leads to sensitization of A delta and C mechanoreceptive units of the remote peripheral nerve endings, which results in an increase in afferent discharge of these units.

Kui-shui Shou - One of the best experts on this subject based on the ideXlab platform.

  • The clinical application of neuroCutaneous flap pedicled with digital artery Dorsal Cutaneous Branches
    Chinese Journal of Hand Surgery, 2014
    Co-Authors: Xiao Zhou, Kui-shui Shou, Yajun Xu
    Abstract:

    Objective To report the treatment outcomes of repairing skin defect of the finger by transferring neuroCutaneous flap pedicled with Dorsal Cutaneous branch of the digital artery close to the defect.Methods From June 2011 to March 2012,15 fingers in 14 cases with skin defect were treated with transfer of neuroCutaneous flap pedicled with digital artery Dorsal Cutaneous branch close to the defect.Results All 15 flaps survived completely.The patients were follow-up for 6 to 18months.The colour,texture and contour of the flaps were good.There was no bulkiness of the skin pedicles.Two-point discrimination was 7.0 to 10.0 mm.Skin grafts at the donor sites also survived completely.Joint movement of the fingers was normal.Based on the upper limb functional assessment criteria issued by the Chinese Medical Association Hand Surgery Society,the results were rated as excellent in 13 fingers,good in 1 finger and fair in 1 finger.The overall satisfactory rate was 93.3 ％.No complications were noted at the donor site.Conclusion This procedure spares the digital artery and nerve.It is an improvement over the conventional Dorsal fascioCutaneous island flap.It is a new method for the treatment of finger skin defect. Key words: Finger injuries;  Surgical flaps;  Perforator

  • Clinical application of island flap pedicled with Dorsal Cutaneous Branches of thumb radial digital artery
    Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery, 2011
    Co-Authors: Xiao Zhou, Kui-shui Shou, Yongjun Rui, Qun Yao
    Abstract:

    OBJECTIVE: To investigate the effectiveness of the island flap pedicled with the Dorsal Cutaneous Branches of thumb radial digital artery from the same finger for repairing pulp defect. METHODS: Between June 2009 and March 2010, 10 patients (10 fingers) with pulp defect of thumb were treated. There were 6 males and 4 females, aged 13-68 years with an average of 38 years. Defect was caused by machine crush in 4 cases, by saw machine in 3 cases, by chronic infection in 2 cases, and by burn in 1 case. The disease duration was 3 hours to 4 months. In 4 cases of distal pulp defect (1.0 cm x 0.8 cm to 2.0 cm x 1.4 cm) with exposure of bone or tendon, defect was repaired with island flap pedicled with the interphalangeal joint Cutaneous Branches of thumb radial digital artery (1.0 cm x 0.8 cm to 2.2 cm x 1.5 cm). In 6 cases of proximal pulp defect (1.0 cm x 0.8 cm to 2.5 cm x 2.0 cm) with exposure of bone or tendon, defect was repaired with island flap pedicled with the metacarpophalangeal joint Cutaneous Branches of thumb radial digital artery (1.0 cm x 0.8 cm to 2.6 cm x 2.2 cm). The donor sites were repaired with skin grafts. RESULTS: All flaps and skin grafts survived, and wounds healed by first intention. Ten cases were followed up 6-12 months (mean, 8 months). The colour, texture, and contour of the flaps were good. The two-point discrimination was 7-10 mm on the island flap at last follow-up. According to total active motion (TAM) standard, the thumb function was assessed as excellent in 8 cases, good in 1 case, and fair in 1 case, and the excellent and good rate was 90%. CONCLUSION: The main digital artery and nerve of thumb will not be sacrificed when the island flap pedicled with the Dorsal Cutaneous Branches of thumb radial digital artery is used. The operative procedure is simple, so it is a good method for repairing pulp defect of thumb.

  • Repairing skin defects of the fingers with a reverse island flap from the dorsum of the proximal phalanx
    Chinese Journal of Hand Surgery, 2010
    Co-Authors: Zheng Chen, Kui-shui Shou, Yongjun Rui, Jiandong Zhou, Xue-ming Chen
    Abstract:

    Objective To investigate the surgical technique and clinical outcomes of a reverse island flap with multiple feeding vessels from the dorsum of the proximal phalanx for repairing skin defects of the fingers. Methods From January 2005 to December 2008, skin defects at the middle or distal phalangeal level in 59 cases with a total of 71 fingers were treated with a dorsoproximal phalangeal reverse island flap. The flap is supplied by multiple feeding vessels including Dorsal Cutaneous Branches of the proper digital artery, nutrient vessels of Dorsal Cutaneous Branches of the proper digital nerve, and the deep fascia vascular network. The size of the flaps ranged from 2.0 cm × 1.5 cm to 4.0 cm× 2.8 cm. Results Postoperatively all flaps survived. The patients were follow-up for 6 to 24 months. The appearance of the repaired fingers was satisfactory. Two-point discrimination of the flaps recovered to 4.5 to 10.0 mm, with an average of 6.6 mm. Movement of the proximal interphalangeal joint was normal in all cases. There were no obvious complications of the donor site. Conclusion The dorsoproximal phalangeal reverse island flap with multiple feeding vessels has reliable blood supply, does not sacrifice a major artery and can restore good flap sensation. It is an ideal flap for repairing skin defects of the fingers at the middle or distal phalangeal level. Key words: Surgical flaps;  Finger injuries;  Treatment outcome

Daping Yang - One of the best experts on this subject based on the ideXlab platform.

  • reversed Dorsal digital and metacarpal island flaps supplied by the Dorsal Cutaneous Branches of the palmar digital artery
    Annals of Plastic Surgery, 2001
    Co-Authors: Daping Yang, Steven F. Morris
    Abstract:

    The Dorsal digital and metacarpal island flaps have been described for use in a variety of clinical situations. On the basis of the authors' previous angiographic studies, these two skin flaps were planned on the dorsum of the proximal phalanx or intermetacarpal space based on the vascular anastomoses between the proximal Dorsal Cutaneous Branches of the palmar digital artery and the Dorsal digital Branches of the Dorsal metacarpal artery at the level of the proximal phalanx. The authors present a series of 13 patients using these flaps. To reconstruct the injured finger pulp, the reverse Dorsal digital flap was used in 5 patients, and the reverse Dorsal metacarpal flap was used in 8 patients. Most of the 13 patients sustained a work-related injury. Associated injuries of bone, joint, or tendon occurred in most patients. In all patients, the skin defect was located distal to the proximal interphalangeal joint. The skin paddle was taken from the Dorsal aspect of the middle and ring fingers or the first, second, third, and fourth metacarpal area. All flaps survived completely. Two patients who had the Dorsal branch of the sensitive radial nerve anastomosed to the digital nerve recovered 6-mm two-point discrimination in the reverse Dorsal digital flap. The results of this anatomic study and the authors' clinical experience confirm the reliability of the Dorsal digital and metacarpal island flaps.

  • Vascular basis of Dorsal digital and metacarpal skin flaps.
    The Journal of hand surgery, 2001
    Co-Authors: Daping Yang, Steven F. Morris
    Abstract:

    We studied the vascular anatomy of Dorsal digital skin flaps and the vascular anastomoses between the Dorsal Cutaneous branch of the palmar digital artery (PDA) and the Dorsal digital Branches (the terminal Branches) of the Dorsal metacarpal artery (DMA) at the level of the proximal phalanx. Eight fresh cadavers (16 hands) were injected with a lead oxide-gelatin mixture. Our radiographic assessment revealed that there were 2 sources of the arterial supply to the dorsum of the digit, the Dorsal digital Branches of the DMA, and the Dorsal Cutaneous Branches of the PDA. These Branches anastomose with each other. A flap including the territory of the Dorsal Cutaneous Branches of the PDA and a part of the territory of the DMA can be harvested on the Dorsal aspect of the proximal and middle phalanges. The extended neurovascular island flap, based on the PDA and the Dorsal branch of digital nerve, can be transposed to the volar surface of an adjacent finger resurfacing the entire length of the digit.

Barker Helen - One of the best experts on this subject based on the ideXlab platform.

  • Illustration of dissection of left ankle and foot, anterolateral view, inferior extensor retinaculum split and retracted
    Norris Medical Library; University of Southern California. Norris Medical Library, 2010
    Co-Authors: Rehman Irving, Barker Helen
    Abstract:

    Illustration of the inferior extensor retinaculum divided longitudinally and partially retracted to expose a deep tarsal vein and fat-filled tarsal sinus; also retracted: tendons of extensor digitorum longus muscle and fibularis (peroneus) tertius muscle, intermediate and medial Dorsal Cutaneous Branches of superficial fibular (peroneal) nerve, sural nerve; extensor digitorum brevis muscle bellies, abductor digiti minimi muscle; tendons of fibularis (peroneus) brevis muscle, fibularis (peroneus) longus muscle; calcaneus and fibula (lateral malleolus); achilles tendon; lateral malleolar and lateral tarsal Branches of the anterior tibial artery

  • Illustration of left ankle and foot, anterolateral view, inferior extensor retinaculum split and retracted, tarsal sinus exposed
    Norris Medical Library; University of Southern California. Norris Medical Library, 2010
    Co-Authors: Rehman Irving, Barker Helen
    Abstract:

    Illustration of the exposure of tarsal sinus; the inferior extensor retinaculum divided longitudinally and partially retracted to expose a deep tarsal vein and fat-filled tarsal sinus; also retracted: tendons of extensor digitorum longus muscle and fibularis (peroneus) tertius muscle, intermediate and medial Dorsal Cutaneous Branches of superficial fibular (peroneal) nerve, sural nerve; extensor digitorum brevis muscle bellies, abductor digiti minimi muscle; tendons of fibularis (peroneus) brevis muscle, fibularis (peroneus) longus muscle; calcaneus and fibula (lateral malleolus); achilles tendon; lateral malleolar and lateral tarsal Branches of the anterior tibial artery