Resurfacing of multiple adjacent defects with free multipaddle SCIAP flaps.

BACKGROUND: The efficient resurfacing of multiple adjacent defects (MADs) requires precise reconstructive strategy. Various approaches (e.g., several flap transferring or prelamination of the recipient site) have been reported, but recipient-site impairments, pain, long hospitalization, and low cost-benefit results fatefully considered them as compromise approaches. This study aims to evaluate the feasibility of MADs reconstruction with free multipaddle superficial circumflex iliac artery perforator (SCIAP) flaps. METHODS: From Dec 2015 to Dec 2020, we enrolled patients with upper and lower extremity defects treated with various multipaddle SCIAP flaps (2-paddle, 3-paddle, and 4-paddle). Patient demographics and outcomes of each group were collected. RESULTS: Thirty-two, 21, and 6 patients underwent 2-paddle, 3-paddle, and 4-paddle SCIAP flaps transfers, respectively. All multipaddle SCIAP flaps survived without vascular problems, and the donor sites were closed directly. Except for 3 cases of 2-paddle SCIAP flaps drained by superficial circumflex iliac vein venous return, most cases (n = 56) were drained by venae comitans. Minor complications, including partial flap necrosis (4 cases) and lateral femoral cutaneous nerve palsies (11 cases), were treated conservatively. All patients were satisfied with the reconstructive outcome. CONCLUSION: Multiple adjacent defects reconstruction is still a Gordian knot and lacks a golden standard. The free multipaddle SCIAP flap was demonstrated as a promising alternative, not only enriching its versatility but also initially highlighting the "replace need with need" reconstructive demand.

The eNOS-induced leonurine's new role in improving the survival of random skin flap.

In reconstructive and plastic surgery, random skin flaps are commonly utilized to treat skin abnormalities produced by a variety of factors. Flap delay procedure is commonly used to reduce flap necrosis. Due to the limitations of various conditions, the traditional surgical improvement can't effectively alleviate the skin flap necrosis. And leonurine (Leo) has antioxidant and anti-inflammatory effects. In this study, we researched the mechanism underlying the influences of varied Leo concentrations on the survival rate of random skin flaps. Our results showed that after Leo treatment, tissue edema and necrosis of the flap were significantly reduced, while angiogenesis and flap perfusion were significantly increased. Through immunohistochemistry and Western blot, we proved that Leo treatment can upregulate the level of angiogenesis, while Leo treatment significantly reduced the expression levels of oxidative stress, apoptosis and inflammation. As a result, it can significantly improve the overall viability of the random skin flaps through the increase of angiogenesis, restriction of inflammation, attenuation of oxidative stress, and reduction of apoptosis. And this protective function was inhibited by LY294002 (a broad-spectrum inhibitor of PI3K) and L-NAME (NG- nitro-L-arginine methyl ester, a non-selective NOS inhibitor). All in all, Leo is an effective drug that can activate the eNOS via the PI3K/Akt pathway. By encouraging angiogenesis, preventing inflammation, minimizing oxidative stress, and lowering apoptosis, Leo can raise the survival rate of random skin flaps. The recommended concentration of Leo in this study was 30 mg/kg.

Berberine promotes the viability of random skin flaps via the PI3K/Akt/eNOS signaling pathway.

Random skin flaps are often used in reconstruction operations. However, flap necrosis is still a common postoperative complication. Here, we investigated whether berberine (C20 H19 NO5 , BBR), a drug with antioxidant activity, improves the survival rate of random flaps. Fifty-four rats were divided into three groups: control, BBR and BBR + L -NAME groups (L -NAME, L -NG -Nitro-arginine methyl ester). The survival condition and the percentage of survival area of the flaps were evaluated on the seventh day after surgery. After animals were sacrificed, angiogenesis, apoptosis, oxidative stress and inflammation levels were assessed by histological and protein analyses. Our findings suggest that berberine promotes flap survival. The level of angiogenesis increased; the levels of oxidative stress, inflammation and apoptosis decreased; the levels of phosphoinositide 3-kinase (PI3K), phospho-Akt (p-Akt) and phospho-endothelial nitric oxide synthase (p-eNOS) increased in the flap tissue; and L -NAME reversed the effects of berberine on random skin flaps. Statistical analysis showed that the BBR group results differed significantly from those of the control and the BBR + L -NAME groups (p < .05). Our results confirm that berberine is an effective drug for significantly improving the survival rate of random skin flaps by promoting angiogenesis, inhibiting inflammation, attenuating oxidative stress, and reducing apoptosis through the PI3K/Akt/eNOS signaling pathway.

Precise regulation of defect concentration in MOF and its influence on photocatalytic overall water splitting.

In this work, the defective Cu-BDC with different defect concentration and Cu1+/Cu2+ coordinatively unsaturated sites (CUS) content were designed and synthesized by introducing defective linkers with different pKa values. The low-concentration defects in Metal-organic frameworks (MOFs) structure act as the active sites to enhance their photocatalytic activity. In contrast, the high concentration defects serve as the recombination centers of photogenerated electrons and holes to decrease the transfer efficiency of charge carriers. Cu-BDC-FBA shows an excellent bifunctional photocatalytic performance for overall water splitting due to the suitable defect concentration, which gives an oxygen production rate of 3114 µmol g-1 h-1 and hydrogen production rate of 16 829 µmol g-1 h-1, respectively. It is expected that this study can deepen the understanding of the relationship between defects and photocatalytic activity, and provide a new idea for the design and synthesis of defective MOFs photocatalysts with excellent performance.

Effect of memantine on the survival of an ischemic random skin flap and the underlying mechanism.

BACKGROUND: Skin flap transplantation is a common wound repair method in orthopedic surgery, but skin flap necrosis remains problematic. Memantine, an excitatory amino acid receptor antagonist, is currently used in the treatment of moderate to severe Alzheimer's disease, due to its ability to promote angiogenesis and reduce oxidative stress. This study investigated the effect of memantine on the survival of random skin flaps in Sprague-Dawley (SD) rats. MATERIALS AND METHODS: Thirty six male SD rats were divided into control, high-dose (20 mg/kg per day), and low-dose (10 mg/kg per day) groups and underwent a McFarland flap procedure. Seven days later, the survival of the flap was evaluated, The microvascular density and neutrophil density were measured by hematoxylin and eosin staining. Lead angiography was used to detect angiogenesis, and laser Doppler was used to detect blood perfusion. Expression levels of vascular endothelial growth factor (VEGF), interleukin (IL)-1ß, IL-6, tumor necrosis factor (TNF)-α, Toll-like receptor (TLR) 4, nuclear factor kappa B(NF-κB) and Mitogen-activated protein kinase（MAPK）were detected by immunohistochemistry. Oxidative stress was evaluated by measuring the levels of malondialdehyde (MDA) and superoxide dismutase (SOD). RESULTS: Compared with the control group, the flap survival area of memantine group, especially the high-dose group, was larger, VEGF expression, microvascular density, angiogenesis, blood perfusion, and superoxide dismutase in the flap were higher in the Memantine-H group than in the Memantine-L and control groups (P < 0.01). In addition, levels of neutrophil density, IL-1ß, IL-6, TNF-α, TLR4, NF-κB, MAPK and malondialdehyde decreased significantly in the Memantine-H group (P < 0.01). CONCLUSIONS: Memantine can promote the survival of skin flap in rats by improving the blood supply, promoting angiogenesis, inhibiting the inflammatory response, and reducing ischemia-reperfusion injury.

Magnetic porous carbon derived from Zn/Co metal-organic framework as an adsorbent for extraction and determination of carbamates.

A novel magnetic porous carbon with a high specific surface and magnetization saturation, derived from a Zn/Co-MOF-5, was fabricated by direct carbonization of Zn/Co-MOF-5 without the need of additional carbon precursors under optimum pyrolysis temperature. The material was employed as an adsorbent for magnetic solid-phase extraction of four carbamates from water and tomato samples prior to high-performance liquid chromatography-tandem quadrupole mass spectrometry analysis. Under optimum conditions, the method displayed good linearity (r > 0.9987) within the concentration range 0.05-20 ng mL-1 for water samples and 0.1-40 ng g-1 for tomato samples. The limits of detection (S/N = 3) for the four carbamate pesticides were in the range 0.0006-0.013 ng mL-1 for water samples and 0.001-0.01 ng g-1 for tomato samples and satisfactory spiked recoveries in the range 86.1 to 109.1% were obtained with the relative standard deviation values from 2.1 to 14.0%. Graphical abstract.

Magnetic Fe3O4-encapsulated VAN@MIL-101(Fe) with mixed-valence sites and mesoporous structures as efficient bifunctional water splitting photocatalysts.

Fe3O4/VAN@MIL-101(Fe) with both mesoporous and mixed-valence Fe3+/Fe2+ structures was controllably synthesized in the synthesis of MIL-101(Fe), and it was used as a bifunctional photocatalyst in both oxygen evolution reactions (OERs) and hydrogen evolution reactions (HERs) of photocatalytic water splitting. By the reduction of auxiliary ligand vanillin (VAN) and the introduction of Fe3O4, the mixed-valence Fe3+/Fe2+ structure in Fe3O4/VAN@MIL-101(Fe) was obtained, which improves the band gap of the Fe3+ reactive active center and increases the separation efficiency of photogenerated carriers. Owing to the partial difference in the structure between VAN and ligand terephthalic acid (H2BDC), hierarchical porous and vacant structures were effectively improved in Fe3O4/VAN@MIL-101(Fe), which can induce more active sites to adsorb more water molecules and shorten the electron-hole migration distance to improve the transfer efficiency of photogenerated carriers. Therefore, Fe3O4/VAN@MIL-101(Fe) presents excellent photocatalytic activities for improving the O2 and H2 production rate up to 360 000 µmol g-1 h-1 and 584 µmol g-1 h-1, respectively. Meanwhile, Fe3O4/VAN@MIL-101(Fe) maintains the excellent catalytic activity in OERs and HERs after recycling for 5 times. Moreover, the introduction of magnetic Fe3O4 nanoplates into Fe3O4/VAN@MIL-101(Fe) can make it easily recyclable by magnetic separation, which can maximize its performance.

A Comparative Study of Finger Pulp Reconstruction Using Free Distal Ulnar Artery Perforator Flaps and Reverse Dorsal Homodigital Island Flaps.

PURPOSE: This study aimed to compare and analyze the outcomes of finger reconstruction using free distal ulnar artery perforator (FDUAP) and reverse dorsal homodigital island (RDHI) flaps. METHODS: The study included 27 patients with finger pulp defects that were reconstructed using FDUAP or RDHI flaps. Standardized assessment of outcomes included objective sensory recovery, duration of operation, range of motion in the repaired fingers, pain at the reconstructed finger pulps and donor sites, and recovery time before returning to work. Subjective assessment of outcomes included the cold intolerance, aesthetic appearance, and functional recovery. RESULTS: All flaps in the series showed complete survival. The average surgical time for the RDHI flaps was significantly smaller than that for the FDUAP flaps. Sensory recovery was significantly better with FDUAP flaps than with RAHI flaps. No significant differences were detected between the 2 procedures regarding range of motion, cold intolerance, or pain of the injured finger pulps and donor sites. The outcomes of aesthetic result and functional recovery satisfied all patients. Optimal cosmetic satisfaction was obtained in the FDUAP flap group. CONCLUSIONS: Although both types of flaps offer a satisfactory approach for finger reconstruction with small-to-medium defects, FDUAP flaps are more suitable for such operations because of the better sensory reconstruction and aesthetic results.

Effects of adiponectin on random pattern skin flap survival in rats.

BACKGROUND: Random flaps are commonly used to repair wounds and improve the clinical appearance. However, flap necrosis is frequently encountered in the clinical setting. Adiponectin is a biologically active endogenous polypeptide secreted by adipocytes that can reduce oxidative stress, inflammation, and apoptosis. This study was performed to explore the effects of adiponectin on the survival of random flaps in rats. MATERIALS AND METHODS: Thirty-six healthy rats were divided into two groups, i.e., an adiponectin group and a control group. A modified McFarlane flap was created on the backs of the rats. The area of flap survival was gauged after sacrifice of the rats on day 7 after surgery, and the tissue samples were subjected to histological analysis. Angiogenesis was assessed by oxide-gelatin angiography, laser Doppler imaging, and immunohistochemistry. Pathological changes in the flaps were examined by hematoxylin and eosin staining. The level of oxidative stress was evaluated using malondialdehyde (MDA) and superoxide dismutase (SOD) kits. RESULTS: The adiponectin group had a larger tissue survival area and less edema compared with the control group. VEGF expression and SOD activity were markedly increased, but the MDA level was significantly decreased, in the adiponectin group. Histological analysis showed that adiponectin promoted angiogenesis and inhibited inflammation. CONCLUSIONS: Adiponectin is useful for improving random skin flap survival.

Effects of curculigoside A on random skin flap survival in rats.

Necrosis in distal areas of random skin flaps remains a challenging issue. Curculigoside A (CA), one of the main bioactive phenolic compounds, has been reported to induce angiogenesis in vitro by increasing proliferation, tube formation, and migration. In addition, CA was shown to increase vascular endothelial growth factor (VEGF) expression. In this study, we investigated the potential use of CA as a novel candidate to enhance the viability of the ischemic skin flap. A modified McFarlane flap was used as a surgical model in Sprague-Dawley rats. Three groups of rats were treated as follows: the control group received 0.9% saline orally, while rats in the two treatment groups were administered 10 mg/kg or 20 mg/kg CA orally for 7 days, respectively. On day7, the mice were killed, and tissue samples were collected for hematoxylin and eosin staining and immunohistochemical examination, while laser Doppler imaging and oxide-gelatin angiography were performed to assess angiogenesis. Kits for the analysis of superoxide dismutase (SOD) and malondialdehyde (MDA) were used to verify the oxidative stress level. Treating animals with CA significantly increased the surviving portion of the flaps. VEGF and SOD expression and microvessel development were markedly increased, and the MDA level was reduced, in the CA treatment groups. Histological studies demonstrated that CA promoted angiogenesis and attenuated inflammatory cell numbers. These findings indicated that CA increases random skin flap survival.

Effects of Tirofiban on Random Skin Flap Survival in Rats.

BACKGROUND: Tirofiban is a glycoprotein IIb/IIIa receptor antagonist that is widely used clinically. In the present study, we investigated whether tirofiban promotes flap survival in rat random skin flap model. METHODS: "McFarlane flaps" models were developed in 60 male rats. The rats were divided into a tirofiban-treated group (n = 30) and a saline-treated group (n = 30). The flap surviving rate was calculated 7 days after surgery. Tissue samples were collected and subjected to histopathological evaluation. Lead oxide-gelatin angiography and immunohistochemical staining analysis were taken to evaluate angiogenesis. Analysis of oxidative stress was performed by measuring the activity of superoxide dismutase (SOD) and malondialdehyde (MDA). RESULTS: Compared with controls, the tirofiban-treated groups exhibited significantly larger mean areas of flap survival, significantly increased SOD activity, and vascular endothelial growth factor (VEGF) expression, and significantly reduced MDA level. Hematoxylin and eosin staining revealed that naringin promoted angiogenesis and inhibited inflammation. CONCLUSION: These findings demonstrate that tirofiban increases flap survival of random skin flaps in rats.

Naringin improves random skin flap survival in rats.

BACKGROUND: Random-pattern flap transfer is commonly used to treat soft-tissue defects. However, flap necrosis remains a serious problem. Naringin accelerates angiogenesis by activating the expression of vascular endothelial growth factor (VEGF). In the present study, we investigated whether naringin improves the survival of random skin flaps. RESULTS: Compared with controls, the naringin-treated groups exhibited significantly larger mean areas of flap survival, significantly increased SOD activity and VEGF expression, and significantly reduced MDA level. Hematoxylin and eosin (HE) staining revealed that naringin promoted angiogenesis and inhibited inflammation. MATERIALS AND METHODS: "McFarlane flap" models were established in 90 male Sprague-Dawley (SD) rats divided into three groups: a 40 mg/kg control group (0.5 % sodium carboxymethylcellulose), a 40 mg/kg naringin-treated group, and an 80 mg/kg naringin-treated group. The extent of necrosis was measured 7 days later, and tissue samples were subjected to histological analysis. Angiogenesis was evaluated via lead oxide-gelatin angiography, immunohistochemistry, and laser Doppler imaging. Inflammation was evaluated by measurement of serum TNF-α (tumor necrosis factor-α) and IL-6 (interleukin-6) levels. Oxidative stress was assessed by measuring superoxide dismutase (SOD) activity and the malondialdehyde (MDA) level. CONCLUSION: Naringin improved random skin flap survival.

Peroneal artery perforator flap for the treatment of chronic lower extremity wounds.

BACKGROUND: Reconstruction of chronic lower extremity wounds remains challenging. These wounds are mainly associated with diabetes mellitus, infections, and osteomyelitis. Although several reconstructive techniques are available, the peroneal artery perforator flap has unique advantages. METHODS: In this study, we discuss our experiences with peroneal artery perforator flaps in 55 patients who had suffered from chronic lower limb wounds. The size of the defect, comorbidities, etiology, flap size, and complications were recorded and analyzed based on a retrospective chart review. RESULTS: All 55 flaps survived. In two cases, small superficial necrosis occurred, one of which healed with conservative treatment and the other was reconstructed with split thickness skin grafts. Partial necrosis was observed in nine cases, seven of which were covered with split thickness skin grafts and the remaining two sutured directly after adequate debridement. Vascular compromise was observed in one patient, which was salvaged successfully by performing an exploratory procedure and releasing a few sutures. No complications were seen in the remaining 44 cases. CONCLUSION: The peroneal artery perforator flap is a reliable option for reconstruction of chronic lower extremity wounds.