Microcirculation最新文献

{"title":"The sublingual microcirculation and frailty index in chronic kidney disease patients","authors":"Ryan A. P. Homes,&nbsp;Fiona Giddens,&nbsp;Ross S. Francis,&nbsp;Ruth E. Hubbard,&nbsp;Emily H. Gordon,&nbsp;Mark J. Midwinter","doi":"10.1111/micc.12819","DOIUrl":"10.1111/micc.12819","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>To examine the relationship between sublingual microcirculatory measures and frailty index in those attending a kidney transplant assessment clinic.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Patients recruited had their sublingual microcirculation taken using sidestream dark field videomicroscopy (MicroScan, Micro Vision Medical, Amsterdam, the Netherlands) and their frailty index score using a validated short form via interview.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>A total of 44 patients were recruited with two being excluded due to microcirculatory image quality scores exceeding 10. The frailty index score indicated significant correlations with total vessel density (<i>p</i> &lt; .0001, <i>r</i> = −.56), microvascular flow index (<i>p</i> = .004, <i>r</i> = −.43), portion of perfused vessels (<i>p</i> = .0004, <i>r</i> = −.52), heterogeneity index (<i>p</i> = .015, <i>r</i> = .32), and perfused vessel density (<i>p</i> &lt; .0001, <i>r</i> = −.66). No correlation was shown between the frailty index and age (<i>p</i> = .08, <i>r</i> = .27).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>There is a relationship between the frailty index and microcirculatory health in those attending a kidney transplant assessment clinic, that is not confounded by age. These findings suggest that the impaired microcirculation may be an underlying cause of frailty.</p>\u0000 </section>\u0000 </div>","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 5-6","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/micc.12819","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9985834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variations in mechanical stiffness alter microvascular sprouting and stability in a PEG hydrogel model of idiopathic pulmonary fibrosis","authors":"Julie Leonard-Duke,&nbsp;Anthony C. Bruce,&nbsp;Shayn M. Peirce,&nbsp;Lakeshia J. Taite","doi":"10.1111/micc.12817","DOIUrl":"10.1111/micc.12817","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>Microvascular remodeling is governed by biomechanical and biochemical cues which are dysregulated in idiopathic pulmonary fibrosis. Understanding how these cues impact endothelial cell-pericyte interactions necessitates a model system in which both variables can be independently and reproducibly modulated. In this study we develop a tunable hydrogel-based angiogenesis assay to study how varying angiogenic growth factors and environmental stiffness affect sprouting and vessel organization.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Lungs harvested from mice were cut into 1 mm long segments then cultured on hydrogels having one of seven possible stiffness and growth factor combinations. Time course, brightfield, and immunofluorescence imaging were used to observe and quantify sprout formation.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Our assay was able to support angiogenesis in a comparable manner to Matrigel in soft 2 kPa gels while enabling tunability to study the effects of stiffness on sprout formation. Matrigel and 2 kPa groups contained significantly more samples with sprouts when compared to the stiffer 10 and 20 kPa gels. Growth factor treatment did not have as obvious an effect, although the 20 kPa PDGF + FGF-treated group had significantly longer vessels than the vascular endothelial growth factor-treated group.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>We have developed a novel, tunable hydrogel assay for the creation of lung explant vessel organoids which can be modulated to study the impact of specific environmental cues on vessel formation and maturation.</p>\u0000 </section>\u0000 </div>","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 5-6","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/micc.12817","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9997375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Circadian and sex differences in post-ischemic vasodilation and reactive hyperemia in young individuals and elderly with and without type 2 diabetes","authors":"Alessandro Gentilin,&nbsp;Paolo Moghetti,&nbsp;Antonio Cevese,&nbsp;Anna Vittoria Mattioli,&nbsp;Federico Schena,&nbsp;Cantor Tarperi","doi":"10.1111/micc.12818","DOIUrl":"10.1111/micc.12818","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>Cardiovascular events show morning preference and sex differences, and are related to aging and type 2 diabetes. We assessed circadian variations and sex differences in vascular conductance (VC) and blood flow (BF) regulations following a brief bout of forearm ischemia.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Young healthy individuals (H18-30) and elderly without (H50-80) and with type 2 diabetes (T2DM50-80) of both sexes were included. Forearm VC and BF, and mean arterial pressure (MAP) at baseline and following circulatory reperfusion were measured at 6 a.m. and 9 p.m.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>In the morning compared to evening, following reperfusion, the VC and BF increments were similar in H18-30 (p<i>&gt;</i>.71), but lower in H50-80 (p<i>&lt;</i>.001) and T2DM50-80 (p<i>&lt;</i>.01). VC and BF following circulatory reperfusion were higher in men than women in H18-30 (p<i>&lt;</i>.001), but similar between sexes in the older groups (p<i>&gt;</i>.23).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>Forearm vasodilation following reperfusion is attenuated in the morning in the elderly, impairing BF towards an ischemic area. Diabetes does not affect the circadian regulation of VC and BF, but that of MAP. There are sex differences in VC and BF at baseline and after circulatory reperfusion at a young age, being greater in men, which disappear with aging without being affected by diabetes.</p>\u0000 </section>\u0000 </div>","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 5-6","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9970418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"5-HT7 receptors mediate dilation of rat cremaster muscle arterioles in vivo","authors":"William F. Jackson,&nbsp;Armond Daci,&nbsp;Janice M. Thompson,&nbsp;Gregory D. Fink,&nbsp;Stephanie W. Watts","doi":"10.1111/micc.12808","DOIUrl":"https://doi.org/10.1111/micc.12808","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>Serotonin (5-HT) infusion in vivo causes hypotension and a fall in total peripheral resistance. However, the vascular segment and the receptors that mediate this response remain in question. We hypothesized that 5-HT₇ receptors mediate arteriolar dilation to 5-HT in skeletal muscle microcirculation.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Cremaster muscles of isoflurane-anesthetized male Sprague-Dawley rats were prepared for in vivo microscopy of third- and fourth-order arterioles and superfused with physiological salt solution at 34°C. Quantitative real-time PCR (RT-PCR) was applied to pooled samples of first- to third-order cremaster arterioles (2–4 rats/sample) to evaluate 5-HT₇ receptor expression.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Topical 5-HT (1–10 nmols) or the 5-HT_1/7 receptor agonist, 5-carboxamidotryptamine (10–30 nM), dilated third- and fourth-order arterioles, responses that were abolished by 1 μM SB269970, a selective 5-HT₇ receptor antagonist. In contrast, dilation induced by the muscarinic agonist, methacholine (100 nmols) was not inhibited by SB269970. Serotonin (10 nmols) failed to dilate cremaster arterioles in 5-HT₇ receptor knockout rats whereas arterioles in wild-type litter mates dilated to 1 nmol 5-HT, a response blocked by 1 μM SB269970. Quantitative RT-PCR revealed that cremaster arterioles expressed mRNA for 5-HT₇ receptors.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>5-HT₇ receptors mediate dilation of small arterioles in skeletal muscle and likely contribute to 5-HT-induced hypotension, in vivo.</p>\u0000 </section>\u0000 </div>","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 5-6","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/micc.12808","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50137922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impaired peripheral microvascular reactivity in patients with nonobstructive coronary artery disease","authors":"Zulkefli Sanip,&nbsp;Nurnajwa Pahimi,&nbsp;Nur Adilah Bokti,&nbsp;Zurkurnai Yusof,&nbsp;Mohd Sapawi Mohamed,&nbsp;W. Yus Haniff W. Isa,&nbsp;Aida Hanum Rasool","doi":"10.1111/micc.12807","DOIUrl":"10.1111/micc.12807","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>This study aimed to determine whether peripheral microvascular reactivity is impaired in patients with nonobstructive coronary artery disease (NOCAD).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Stable patients presenting with angina were recruited and, based on results from coronary angiography, were categorized into OCAD (coronary stenosis of ≥50%) and NOCAD (stenosis &lt;50%) groups. A control group with no history of angina was also recruited. Forearm skin microvascular reactivity was measured using the laser Doppler blood perfusion monitor and the process of postocclusive skin reactive hyperemia (PORH).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Patients were categorized into OCAD (<i>n</i> = 42), NOCAD (<i>n</i> = 40), and control (<i>n</i> = 39) groups. Compared with the control group, the PORH perfusion percent change (PORH% change) was significantly lower in the OCAD and NOCAD groups. No significant differences were noted between the OCAD and NOCAD groups. Additionally, the NOCAD group without any coronary obstruction takes a longer time to reach peak perfusion and had lower PORH% change compared with the nonangina control group.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Angina patients with NOCAD have microvascular dysfunction as demonstrated by reduced magnitude of reperfusion with an ischemic stimulus. NOCAD patients without coronary obstruction also displayed a slower response to reperfusion.</p>\u0000 </section>\u0000 </div>","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9511850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lymphatic Pathophysiology","authors":"Sanjukta Chakraborty,&nbsp;Brandon J. Dixon,&nbsp;Joseph M. Rutkowski,&nbsp;Jorge A. Castorena-Gonzalez,&nbsp;Jerome W. Breslin","doi":"10.1111/micc.12806","DOIUrl":"10.1111/micc.12806","url":null,"abstract":"Lymphatic research has rapidly accelerated and evolved over the last few decades with more clinicians and basic scientists appreciating the huge impact of this vasculature.1 The lymphatic system, with its network of vessels and interconnected nodes, returns interstitial fluid to the blood circulation and is central in the maintenance of fluid homeostasis, immune surveillance, and uptake of dietary lipids.2,3 The development of cuttingedge genetic models and imaging tools to manipulate and visualize lymphatic vessels, coupled with bioengineering approaches applied to the fundamental physiology of lymphatic vessel function, has significantly impacted our current understanding of the critical roles played by lymphatics both during development and in pathophysiological conditions across a plethora of disease states. This Special Topic Issue showcases a collection of primary research and review articles that highlight the diverse roles of lymphatics in disease pathogenesis that could potentially be leveraged to develop novel targeted approaches for therapeutic interventions. The primary research articles in the issue take various approaches to manipulate or target lymphatic vessel growth and function in disease. For example, the study by Michalaki et al.4 describes the therapeutic potential of engineered human mesenchymal stem cells overexpressing vascular endothelial growth factor C (VEGFC), as an autologous cellbased therapeutic treatment, for alleviation of lymphatic dysfunction associated with secondary injury mediated lymphedema. The study by Mahamud et al.5 shows that transcription factor GATA2 promotes blood/lymph separation through platelets and that while lymphovenous valves are the only known sites of interaction between blood and lymphatic vessels, more unidentified sites of interaction possibly exist between blood and lymphatic vessels. Steinskog et al.6 used a rat model mimicking acute myeloid leukemia (AML) with cannulation of efferent lymphatic vessels from the spleen and liver and subsequent proteomic profiling. Their findings revealed a differential response in AMLcell infiltrated spleen and liver, indicating that interstitial fluid and efferent lymph can provide unique information about the specific microenvironment responses that are variable in target organs during AML progression. In the work by Jo et al.,7 the effects of five different components which comprise Goreisan, a traditional herbal formulation (used as a therapeutic in Japan to alleviate lymphedema symptoms), were investigated for their effects on mesenteric lymphatic pumping in rats. They showed that that acute exposure of two components of Goreisan decreased lymphatic pumping in isolated rat mesenteric collecting lymphatics while oral administration of Goreisan induced vascular endothelial growth factor receptor 3 (VEGFR3), in these lymphatic vessels. Jablon et al.8 describe the development of an innovative technique for routine isolation, culture and characterization","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 2-3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9442087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enlargement of opisthenar microcirculatory area predicts impaired heart function in severe acute coronary syndrome patients","authors":"Chen Chen,&nbsp;Bai Lin Zhu,&nbsp;Wei Da Zheng,&nbsp;Zhen Yi Guo,&nbsp;Xin Jin,&nbsp;Zai Hao Zhao,&nbsp;Mei Hua Lin,&nbsp;Lan Cui,&nbsp;Yin Hua Zhang","doi":"10.1111/micc.12803","DOIUrl":"10.1111/micc.12803","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>Impaired microcirculation in acute coronary syndrome (ACS) patients manifests inadequate recovery and adverse clinical outcome. Here, we analyzed correlations between peripheral microcirculation and heart function in ACS patients.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Opisthenar microvessel area (OMA) were measured with optical coherence tomography angiography (OCTA), cardiac functional indexes (echocardiograph) were assessed 48–72 h after therapeutic interventions.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Results showed that OMA normalized with heart rate (OMA-HR) were significantly greater in ACS patients with percutaneous intervention (ACS-PCI, <i>n</i> = 25, stenosis &gt;80%) compared to those with pharmacological intervention (ACS-PI, <i>n</i> = 23, stenosis &lt;50%, <i>p</i> = .02). Ejection fraction (EF) and fractional shortening (FS), which were not different between two groups, showed negative correlations with OMA-HR in ACS-PCI (EF: <i>r</i> = −0.512, <i>p</i> = .009; FS: <i>r</i> = −0.594, <i>p</i> = .002). Cardiac output (CO) inversely correlated with OMA-HR in both groups (<i>r</i> = −0.697, <i>p</i> &lt; .0001; <i>r</i> = −0.527, <i>p</i> = .01). Neutrophil to lymphocyte ratio (NLR) on admission was greater in ACS-PCI group. NLR, which was negatively associated with EF or FS, was positively associated with OMA-HR in all patients. The area under the curve (AUC) for OMA-HR was 0.683 (specificity 0.696 and sensitivity 0.72, <i>p</i> = .02). OMA-HR at &gt;376.5 μm² predicts reduced FS and CO (<i>p</i> = .002, <i>p</i> = .005, respectively). Summary OMA-HR predicts inadequate recovery of the heart in severe ACS patients post-PCI.</p>\u0000 </section>\u0000 </div>","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9449213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fixing skeletal muscle PO2 eliminates hyperinsulinemic microvascular blood flow response","authors":"Brenda N. Wells,&nbsp;Gaylene M. Russell McEvoy,&nbsp;Hamza Shogan,&nbsp;Meghan E. Kiley,&nbsp;Graham M. Fraser","doi":"10.1111/micc.12805","DOIUrl":"https://doi.org/10.1111/micc.12805","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>To determine if insulin-mediated hyperemia is partially dependent on local muscle oxygen concentration.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Sprague–Dawley rats were anesthetized, and the extensor digitorum longus (EDL) was reflected onto an inverted microscope. Intravital video microscopy sequences were recorded during baseline and hyperinsulinemic euglycemia. The muscle was reflected over a glass stage insert (Experiment 1a and 1b), or over a gas exchange chamber (Experiment 2), and microvascular capillary blood flow was recorded during sequential changes (7%–12%–2%–7%) of oxygen (O₂) concentration. Blood flow was measured by the red blood cell supply rate (SR) in number of cells per second. All animal protocols were approved by Memorial University's Institutional Animal Care Committee.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>In Experiment 1a, SR increased from 8.0 to 14.0 cells/s at baseline to euglycemia (<i>p</i> = .01), while no significant SR variation was detected after performing a sham hyperinsulinemic euglycemic clamp (Experiment 1b). In Experiment 2, SR decreased at 12% O₂ and increased at 2% O₂, compared to 7% O₂, under both experimental conditions. Magnitude of SR responses to oxygen oscillations during euglycemia were not different to those at baseline at each O₂ concentration (<i>p</i> &gt; .9).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>Our results suggest that increased blood flow observed in response to insulin is eliminated if tissue oxygen microenvironment is fixed at a given oxygen concentration.</p>\u0000 </section>\u0000 </div>","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50132922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Association between mean arterial pressure and sublingual microcirculation during major non-cardiac surgery: Post hoc analysis of a prospective cohort","authors":"Eleni Laou,&nbsp;Nikolaos Papagiannakis,&nbsp;Anastasia Michou,&nbsp;Nicoleta Ntalarizou,&nbsp;Dimitrios Ragias,&nbsp;Zacharoula Angelopoulou,&nbsp;Daniel I. Sessler,&nbsp;Athanasios Chalkias","doi":"10.1111/micc.12804","DOIUrl":"10.1111/micc.12804","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>To test the hypothesis that there is an association between mean arterial pressure (MAP) and sublingual perfusion during major surgery, and perhaps an identifiable harm threshold.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>This post hoc analysis of a prospective cohort included patients who had elective major non-cardiac surgery with a duration of ≥2 h under general anesthesia. We assessed sublingual microcirculation every 30 min using SDF+ imaging and determined the De Backer score, Consensus Proportion of Perfused Vessels (Consensus PPV), and the Consensus PPV (small). Our primary outcome was the relationship between MAP and sublingual perfusion which was evaluated with linear mixed effects modeling.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>A total of 100 patients were included, with MAP ranging between 65 mmHg and 120 mmHg during anesthesia and surgery. Over a range of intraoperative MAPs between 65 and 120 mmHg, there were no meaningful associations between blood pressure and various measures of sublingual perfusion. There were also no meaningful changes in microcirculatory flow over 4.5 h of surgery.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>In patients having elective major non-cardiac surgery with general anesthesia, sublingual microcirculation is well maintained when MAP ranges between 65 and 120 mmHg. It remains possible that sublingual perfusion will be a useful marker of tissue perfusion when MAP is lower than 65 mmHg.</p>\u0000 </section>\u0000 </div>","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/micc.12804","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9510848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling lymphangiogenesis: Pairing in vitro and in vivo metrics","authors":"Aileen C. Suarez,&nbsp;Jennifer H. Hammel,&nbsp;Jennifer M. Munson","doi":"10.1111/micc.12802","DOIUrl":"10.1111/micc.12802","url":null,"abstract":"<p>Lymphangiogenesis is the mechanism by which the lymphatic system develops and expands new vessels facilitating fluid drainage and immune cell trafficking. Models to study lymphangiogenesis are necessary for a better understanding of the underlying mechanisms and to identify or test new therapeutic agents that target lymphangiogenesis. Across the lymphatic literature, multiple models have been developed to study lymphangiogenesis in vitro and in vivo. In vitro, lymphangiogenesis can be modeled with varying complexity, from monolayers to hydrogels to explants, with common metrics for characterizing proliferation, migration, and sprouting of lymphatic endothelial cells (LECs) and vessels. In comparison, in vivo models of lymphangiogenesis often use genetically modified zebrafish and mice, with in situ mouse models in the ear, cornea, hind leg, and tail. In vivo metrics, such as activation of LECs, number of new lymphatic vessels, and sprouting, mirror those most used in vitro, with the addition of lymphatic vessel hyperplasia and drainage. The impacts of lymphangiogenesis vary by context of tissue and pathology. Therapeutic targeting of lymphangiogenesis can have paradoxical effects depending on the pathology including lymphedema, cancer, organ transplant, and inflammation. In this review, we describe and compare lymphangiogenic outcomes and metrics between in vitro and in vivo studies, specifically reviewing only those publications in which both testing formats are used. We find that in vitro studies correlate well with in vivo in wound healing and development, but not in the reproductive tract or the complex tumor microenvironment. Considerations for improving in vitro models are to increase complexity with perfusable microfluidic devices, co-cultures with tissue-specific support cells, the inclusion of fluid flow, and pairing in vitro models of differing complexities. We believe that these changes would strengthen the correlation between in vitro and in vivo outcomes, giving more insight into lymphangiogenesis in healthy and pathological states.</p>","PeriodicalId":18459,"journal":{"name":"Microcirculation","volume":"30 2-3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/micc.12802","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9436613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}