691 results found
Arjomandi Rad A, Naruka V, Vardanyan R, et al., 2021, Mitral and tricuspid annuloplasty ring dehiscence: a systematic review with pooled analysis., Eur J Cardiothorac Surg
OBJECTIVES: Mitral and tricuspid ring annuloplasty dehiscence with consequent recurrent valve regurgitation is a rare but challenging procedural failure. The incidence and predisposing risk factors for annuloplasty ring dehiscence include technical and pathological ones. METHODS: A systematic database search with pooled analysis was conducted of original articles that only included dehiscence rate of mitral and tricuspid ring in EMBASE, MEDLINE, Cochrane database and Google Scholar, from inception to November 2020. The outcomes included were dehiscence rate in mitral and tricuspid, type of ring implanted, dehiscence rate by pathology and by ring size and shape. RESULTS: Our search yielded 821 relevant studies. Thirty-three studies met the inclusion criteria with a total of 10 340 patients (6543 mitral, 1414 tricuspid) of which 87 (mitral) and 30 (tricuspid) had dehiscence. Overall, dehiscence rate was 1.43%, diagnosed at a median of 4.5 ± 1.0 months postoperatively. A significant difference in mitral dehiscence rate was found by ring type (semi-rigid 1.86%, rigid 2.32%; flexible 0.43%; P < 0.001). There was no significant difference in rate of dehiscence by ring size (P = 0.067) and shape in mitral (P = 0.281) but there was higher dehiscence rate in ischaemic compared to non-ischaemic mitral regurgitation (3.91% vs 1.63%; P = 0.022). Among tricuspid studies, 9 of 10 studies did not report any dehiscence. CONCLUSIONS: Although rigid, semi-rigid and flexible annuloplasty rings provide acceptable valve repair outcomes, mitral annuloplasty ring dehiscence is clinically more common among rigid rings. Understanding the multifactorial nature of ring dehiscence will help in identifying the patients at high risk and improve their clinical outcomes.
Xu X, Manchester E, Pirola S, et al., 2021, Analysis of Turbulence Effects in a Patient-Specific Aorta with Aortic Valve Stenosis, Cardiovascular Engineering and Technology, ISSN: 1869-408X
Garas G, Darzi A, Athanasiou T, et al., 2021, Stapler closure versus manual closure in total laryngectomy for laryngeal cancer: A systematic review and meta-analysis, CLINICAL OTOLARYNGOLOGY, ISSN: 1749-4478
Salmasi MY, Jarral OA, Athanasiou T, 2021, What can we learn from outliers in cardiac surgery?, JOURNAL OF CARDIAC SURGERY, ISSN: 0886-0440
Arhi C, Askari A, Nachiappan S, et al., 2021, Stage at Diagnosis and Survival of Colorectal Cancer With or Without Underlying Inflammatory Bowel Disease: A Population-based Study, JOURNAL OF CROHNS & COLITIS, Vol: 15, Pages: 375-382, ISSN: 1873-9946
Khader AA, Allaf M, Lu OW, et al., 2021, Does the clinical effectiveness of Mitraclip compare with surgical repair for mitral regurgitation?, Journal of Cardiac Surgery, Vol: 36, Pages: 1103-1119, ISSN: 0886-0440
Background:Surgical repair of the mitral valve has long been the established therapy for degenerative mitral regurgitation (MR). Newer transcatheter methods over the last decade, such as the MitraClip, serve to restore mitral function with reduced procedural burden and enhanced recovery. This study aims to compare the shortterm and midterm outcomes of MitraClip insertion with surgical repair for MR.Methods:A systematic review of the literature was conducted for studies comparing outcomes between surgical repair and MitraClip. The initial search returned 1850 titles, from which 12 studies satisfied the inclusion criteria (one randomized controlled trial and 11 retrospective studies).Results:The final analysis comprised 4219 patients (MitraClip 1210; surgery 3009).Operative mortality was not different between the groups (odds ratio [OR] = 1.63, 95% confidence interval [CI]: [0.63−4.23]; p = .317). Length of hospital stay was significantly shorter in the MitraClip group (standardized mean difference [SMD] = 0.882, 95% CI: [0.77–0.99]; p < .001) with considerable heterogeneity (I2 > 90%; p < .001).The rate of reoperation on the mitral valve was lower in the surgical group (OR = 0.392; 95% CI: [0.188−0.817]; p = .012) as was the rate of MR recurrence grade moderate or above (OR = 0.29; 95% CI: [0.19−0.46]; p < .001) during midterm follow up. Long term survival (4–5 years) was also similar between both groups (hazard ratio = 0.70; 95% CI: [0.35−1.41]; p = .323).Conclusions:This study highlights the superior midterm durability of surgical valve repair for MR compared with the MitraClip.
Abdullahi YS, Salmasi MY, Moscarelli M, et al., 2021, The Use of Frailty Scoring to Predict Early Physical Activity Levels After Cardiac Surgery., Ann Thorac Surg, Vol: 111, Pages: 36-43
BACKGROUND: Assessing patient fitness prior to high-risk operations is becoming increasingly vital in cardiothoracic surgery. Physical activity (PA) and frailty measures are powerful perioperative tools, albeit underused in clinical practice. This study aimed to assess the influence of patient frailty on PA postsurgery and other short-term outcomes. METHODS: Eighty patients undergoing a variety of cardiac surgical procedures (coronary revascularisation, valve repair/replacement, or combination) were recruited to participate. The Reported Edmonton Frailty Scale was used to measure preoperative frailty. As objective measures of PA, participants wore a wrist accelerometer device for 14 days prior to their operation and early in the postoperative period for 30 days. RESULTS: A global reduction in PA was observed in the early postoperative period. Frailty was a significant predictor of reduced light (coefficient -2.23, 95% CI -4.21 to -0.25, P = .028) and moderate activity (coefficient -1.85, 95% CI -2.99 to -0.70, P = .002) postoperatively. Neither frailty nor preoperative PA were predictors of postoperative composite complications. Both frailty (coefficient 0.134, 95% CI 0.106-0.162, P < .001) and PA scores (P < .05) were strong predictors of length of hospital stay (coefficient 1.76, 95% CI 0.003-3.524, P = .05). Furthermore, patients who stayed in hospital longer were more likely to suffer early postoperative complications (stroke, renal failure, reoperation, pacemaker) if they were frail (P < .0001) compared to non-frail patients (P = .607). CONCLUSIONS: This study highlights the predictive ability of objective frailty scoring and PA measurement for outcomes after cardiac surgery. This has important implications for surgical risk stratification and personalized postoperative planning.
Olchanyi MD, Sadikov A, Frattolin J, et al., 2020, Validation of markerless strain-field optical tracking approach for soft tissue mechanical assessment., Journal of Biomechanics, Vol: 116, Pages: 1-11, ISSN: 0021-9290
Strain measurement during tissue deformation is crucial to elucidate relationships between mechanical loading and functional changes in biological tissues. When combined with specified loading conditions, assessment of strain fields can be used to craft models that accurately represent the mechanical behavior of soft tissue. Inhomogeneities in strain fields may be indicative of normal or pathological inhomogeneities in mechanical properties. In this study, we present the validation of a modified Demons registration algorithm for non-contact, marker-less strain measurement of tissue undergoing uniaxial loading. We validate the algorithm on a synthetic dataset composed of artificial deformation fields applied to a speckle image, as well as images of aortic sections of varying perceptual quality. Initial results indicate that Demons outperforms recent Optical Flow and Digital Image Correlation methods in terms of accuracy and robustness to low image quality, with similar runtimes. Demons achieves at least 8% lower maximal deviation from ground truth on 50% biaxial and shear strain applied to aortic images. To illustrate utility, we quantified strain fields of multiple human aortic specimens undergoing uniaxial tensile testing, noting the formation of strain concentrations in areas of rupture. The modified Demons algorithm captured a large range of strains (up to 50%) and provided spatially resolved strain fields that could be useful in the assessment of soft tissue pathologies.
Al-Balah A, Naqvi D, Houbby N, et al., 2020, Comparison of outcomes following transfemoral versus trans-subclavian approach for transcatheter aortic valve Implantation: a meta-analysis, International Journal of Cardiology: Heart and Vasculature, Vol: 31, ISSN: 2352-9067
BackgroundThe subclavian artery is an alternative access route for transcatheter aortic valve implantation (TAVI), with a potential advantage in patients unsuitable for traditional access routes such as the femoral artery. This study aimed to determine the safety and efficacy of the trans-subclavian (TSc) compared to the trans-femoral (TF) approach.MethodsA systematic review was conducted on two online databases: Embase and Medline. The initial search returned 508 titles. Nine observational studies were included: n = 2938 patients (2382 TF and 556 TSc).ResultsBoth TSc and TF groups were comparable for: 30-day mortality (Odds ratio, OR 0.75, 95% CI 0.49 – 1.16, p = 0.195); in-hospital stroke (OR 1.05, 95% CI 0.60–1.85, p = 0.859); myocardial infarction (OR 1.97, 95% CI 0.74–5.23, p = 0.176); paravalvular leaks (OR 1.20, 95% CI 0.76–1.90, p = 0.439); rates of postoperative permanent pacemaker implantation (OR 1.49, 95% CI 0.92–2.41, p = 0.105); in-hospital bleeding and meta-analysis demonstrated no significant difference between access points (OR 3.44, 95% CI 0.35–34.22, p = 0.292). Procedural time was found to be longer in the TSc group (SMD 1.02; 95% CI 0.815–1.219, p < 0.001). Major vascular complications were significantly higher in the TF group (OR 0.55, 95% CI 0.32–0.94, p = 0.029). Meta regression found no influence of the covariates on the outcomes.ConclusionSubclavian access is both a safe and feasible alternative access route for TAVI with lower risks of major vascular complications. This study supports the use of subclavian access as a viable alternative in patient groups where transfemoral TAVI is contraindicated.
Moscarelli M, Lorusso R, Abdullahi Y, et al., 2020, The Effect of Minimally Invasive Surgery and Sternotomy on Physical Activity and Quality of Life., Heart Lung Circ
AIM: The aim of this study was to compare minimally invasive surgery (MI) and median sternotomy (MS) in terms of post-procedure health-related quality of life (HRQoL) and functional outcome. METHOD: We conducted a multicentre prospective cohort study that enrolled patients from January 2015 until February 2017. Combined cardiac procedures were performed with MS and isolated valve procedures with either MS or MI, depending on patient preference and surgeon experience. HRQoL was measured using the five-level version of the EQ-5D (EQ-5D-5L) and physical activity before and after surgery was evaluated using a wearable accelerometer. Activity patterns and intensity recorded by the accelerometer in each period were classified as "sedentary", "light physical activity", "moderate physical activity", and "vigorous physical activity" for each patient. We also conducted a sub-analysis of frail patients in each group, as identified by the Reported Edmonton Frail Scale (>10 points). Patients were followed for 1 year. RESULTS: The study included 100 consecutive patients who underwent MI (n=50) or MS (n=50) during the study period. Patients in the MI group showed a faster recovery of physical activity in the immediate postoperative period and superior HRQoL in the first 3 months (both p<0.001) versus the MS group. Differences between the MI and MS group were indistinguishable over a longer follow-up. A similar correlation was observed in the frailty subanalysis. Overall, the MS group had a higher cumulative incidence of events than the MI group (p<0.001). CONCLUSIONS: Compared to conventional MS, MI was associated with better HRQoL and early functional outcome, even in frail patients.
Salmasi M, Jarral OA, Pirola S, et al., 2020, In-vivo blood flow parameters can predict at-risk aortic aneurysms and dissection: a comprehensive biomechanics model, EUROPEAN HEART JOURNAL, Vol: 41, Pages: 2339-2339, ISSN: 0195-668X
Sideris M, Emin EI, Hanrahan JG, et al., 2020, ABC of Surgical Teaching: Time to Consider a Global Blueprint for Holistic Education, JOURNAL OF INVESTIGATIVE SURGERY, ISSN: 0894-1939
Salmasi MY, Panda A, Hartley P, et al., 2020, Aortic root replacement to treat type A aortic dissection: A comparison of midterm outcomes between composite valve grafts and porcine aortic roots., Journal of Cardiac Surgery, Vol: 35, Pages: 1840-1847, ISSN: 0886-0440
BACKGROUND: Porcine aortic roots (PAR) have been reported in the literature with acceptable short- and long-term outcomes for the treatment of aortic root aneurysms. However, their efficacy in type A aortic dissection (TAAD) is yet to be defined. METHODS: Using data from a locally collated aortic dissection registry, we compared the outcomes in patients undergoing aortic root replacement for TAAD using either of two surgical options: (a) PAR or (b) composite valve grafts (CVG). A retrospective analysis was conducted for all procedures in the period from 2005 to 2018. RESULTS: A total of 252 patients underwent procedures for TAAD in the time period. Sixty-five patients had aortic root replacements (PAR n = 30, CVG n = 35). Between-group comparisons identified a younger CVG group (50.5 vs 64.5, P < .05) although all other covariates were comparable. Operative parameters were comparable between the two groups. The use of PAR did not significantly impact operative mortality (odds ratio [OR], 0.93; 95% confidence interval [CI], 0.22-3.61; P = .992), stroke (OR, 2.91, 0.25-34.09, P = .395), reoperation (OR, 0.91; 95% CI, 0.22-3.62; P = .882) or length of stay (coeff 2.33, -8.23 to 12.90; P = .659) compared to CVG. Five-year survival was similar between both groups (PAR 59% vs CVG 69%; P = .153) and reoperation was negligible. Echocardiography revealed significantly lower aortic valve gradients in the PAR group (8.69 vs 15.45mm Hg; P < .0001), and smaller left ventricular dimensions both at 6-week and 1-year follow-up (P < .05). CONCLUSIONS: This study highlights the comparable short- and midterm outcomes of PAR in cases of TAAD, in comparison to established therapy.
Naase H, Harling L, Kidher E, et al., 2020, Toll-like receptor 9 and the inflammatory response to surgical trauma and cardiopulmonary bypass, Journal of Cardiothoracic Surgery, Vol: 15, ISSN: 1749-8090
ObjectivesCardiac surgery can lead to post-operative end-organ complications secondary to activation of systemic inflammatory response. We hypothesize that surgical trauma or cardiopulmonary bypass (CPB) may initiate systemic inflammatory response via release of mitochondrial DNA (mtDNA) signaling Toll-like receptor 9 (TLR9) and interleukin-6 production (IL-6).Materials and methodsThe role of TLR9 in systemic inflammatory response in cardiac surgery was studied using a murine model of sternotomy and a porcine model of sternotomy and CPB. mtDNA and IL-6 were measured with and without TLR9-antagonist treatment. To study ischemia-reperfusion injury, we utilized an ex-vivo porcine kidney model.ResultsIn the rodent model (n = 15), circulating mtDNA increased 19-fold (19.29 ± 3.31, p < 0.001) and plasma IL-6 levels increased 59-fold (59.06 ± 14.98) at 1-min post-sternotomy compared to pre-sternotomy. In the murine model (n = 11), administration of TLR-9 antagonists lowered IL-6 expression post-sternotomy when compared to controls (59.06 ± 14.98 vs. 5.25 ± 1.08) indicating that TLR-9 is a positive regulator of IL-6 after sternotomy. Using porcine models (n = 10), a significant increase in circulating mtDNA was observed after CPB (Fold change 29.9 ± 4.8, p = 0.005) and along with IL-6 following renal ischaemia-reperfusion. Addition of the antioxidant sulforaphane reduced circulating mtDNA when compared to controls (FC 7.36 ± 0.61 vs. 32.0 ± 4.17 at 60 min post-CPB).ConclusionCPB, surgical trauma and ischemic perfusion injury trigger the release of circulating mtDNA that activates TLR-9, in turn stimulating a release of IL-6. Therefore, TLR-9 antagonists may attenuate this response and may provide a future therapeutic target whereby the systemic inflam
Salmasi MY, Al-Saadi N, Hartley P, et al., 2020, The risk of misdiagnosis in acute thoracic aortic dissection: a review of current guidelines, HEART, Vol: 106, Pages: 885-891, ISSN: 1355-6037
Slim N, Harraz A, Kheirabadi AN, et al., 2020, Innovating a Novel Brain Protection Device for Use in Cardiac Surgery and Cardiac Arrest: A Cool Solution Using Diffusion-Absorption-Refrigeration Technology, International Surgical Conference of the Association-of-Surgeons-in-Training, Publisher: WILEY, Pages: 38-38, ISSN: 0007-1323
Askari A, Guillen LS, Millan M, et al., 2020, Colorectal tumour characteristics and oncological outcome in patients with inflammatory bowel disease, SURGICAL PRACTICE, Vol: 24, Pages: 60-68, ISSN: 1744-1625
Garas G, Cingolani I, Patel V, et al., 2020, Surgical innovation in the era of global surgery: a network analysis, Annals of Surgery, Vol: 271, Pages: 868-874, ISSN: 0003-4932
OBJECTIVE: To present a novel network-based framework for the study of collaboration in surgery and demonstrate how this can be used in practice to help build and nurture collaborations that foster innovation. BACKGROUND: Surgical innovation is a social process that originates from complex interactions among diverse participants. This has led to the emergence of numerous surgical collaboration networks. What is still needed is a rigorous investigation of these networks and of the relative benefits of various collaboration structures for research and innovation. METHODS: Network analysis of the real-world innovation network in robotic surgery. Hierarchical mixed-effect models were estimated to assess associations between network measures, research impact and innovation, controlling for the geographical diversity of collaborators, institutional categories, and whether collaborators belonged to industry or academia. RESULTS: The network comprised of 1700 organizations and 6000 links. The ability to reach many others along few steps in the network (closeness centrality), forging a geographically diverse international profile (network entropy), and collaboration with industry were all shown to be positively associated with research impact and innovation. Closed structures (clustering coefficient), in which collaborators also collaborate with each other, were found to have a negative association with innovation (P < 0.05 for all associations). CONCLUSIONS: In the era of global surgery and increasing complexity of surgical innovation, this study highlights the importance of establishing open networks spanning geographical boundaries. Network analysis offers a valuable framework for assisting surgeons in their efforts to forge and sustain collaborations with the highest potential of maximizing innovation and patient care.
Sideris M, Papalois V, Athanasiou T, et al., 2020, A Novel Multi-faceted Course Blueprint to Support Outcome-based Holistic Surgical Education: The Integrated Generation 4 Model (iG4), IN VIVO, Vol: 34, Pages: 503-509, ISSN: 0258-851X
Moscarelli M, Fattouch K, Gaudino M, et al., 2020, Minimal Access Versus Sternotomy for Complex Mitral Valve Repair: A Meta-Analysis, ANNALS OF THORACIC SURGERY, Vol: 109, Pages: 737-744, ISSN: 0003-4975
Jarral OA, Tan MKH, Salmasi MY, et al., 2020, Phase-contrast magnetic resonance imaging and computational fluid dynamics assessment of thoracic aorta blood flow: a literature review, European Journal of Cardio-Thoracic Surgery, Vol: 57, Pages: 438-446, ISSN: 1010-7940
The death rate from thoracic aortic disease is on the rise and represents a growing global health concern as patients are often asymptomatic before acute events, which have devastating effects on health-related quality of life. Biomechanical factors have been found to play a major role in the development of both acquired and congenital aortic diseases. However, much is still unknown and translational benefits of this knowledge are yet to be seen. Phase-contrast cardiovascular magnetic resonance imaging of thoracic aortic blood flow has emerged as an exceptionally powerful non-invasive tool enabling visualization of complex flow patterns, and calculation of variables such as wall shear stress. This has led to multiple new findings in the areas of phenotype-dependent bicuspid valve flow patterns, thoracic aortic aneurysm formation and aortic prosthesis performance assessment. Phase-contrast cardiovascular magnetic resonance imaging has also been used in conjunction with computational fluid modelling techniques to produce even more sophisticated analyses, by allowing the calculation of haemodynamic variables with exceptional temporal and spatial resolution. Translationally, these technologies may potentially play a major role in the emergence of precision medicine and patient-specific treatments in patients with aortic disease. This clinically focused review will provide a systematic overview of key insights from published studies to date.
Salmasi MY, Hartley P, Hussein M, et al., 2020, Diagnosis and management of acute Type-A aortic dissection in emergency departments: Results of a UK national survey, INTERNATIONAL JOURNAL OF CARDIOLOGY, Vol: 300, Pages: 50-59, ISSN: 0167-5273
Salmasi MY, Theodoulou I, Iyer P, et al., 2019, Comparing outcomes between valve-sparing root replacement and the Bentall procedure in proximal aortic aneurysms: systematic review and meta-analysis., Interact Cardiovasc Thorac Surg, Vol: 29, Pages: 911-922
In aortic root aneurysms, the challenge of a valve-sparing aortic root replacement (VSRR) procedure is to ensure durable aortic valve function without reintervention. Although the Bentall procedure defers the durability of valve function to the prosthesis, short- and long-term complications tend to be higher. The aim of this study was to compare the outcomes of VSRR and Bentall procedures in patients with aortic root aneurysms. A systematic literature review was conducted using PubMed regarding the outcomes of the Bentall procedure compared with those of VSRR from the inception of the 2 procedures until July 2018. Studies with short- and long-term comparative data were included. An initial search yielded 9517 titles. Thirty-four studies were finally included for meta-analysis (all retrospective, non-randomized), comprising 7313 patients (2944 valve-sparing and 4369 Bentall procedures) with no evidence of publication bias. Operative mortality was found to be significantly lower in the VSRR group [odds ratio (OR) 0.51, 95% confidence interval (CI) 0.37-0.70; P < 0.001] despite overall higher cardiopulmonary bypass and aortic cross-clamp times. The 5-year survival rate was also more favourable in the VSRR group (OR 1.93 95% CI 1.15-3.23; P < 0.05). Significantly lower rates of cerebral thromboembolism (OR 0.668, 95% CI 0.477-0.935; P = 0.019) and heart block (OR 0.386, 95% CI 0.195-0.767; P = 0.007) were also found after VSRR. There was no significant difference in rates of reoperation between the groups at long-term follow-up (OR 1.32, 95% CI 0.75-2.33; P = 0.336). Meta-regression of patient and operative covariates yielded no influence on the main outcomes (P > 0.05). These findings suggest that VSRR is an appropriate and potentially better treatment option for a root aneurysm when the aortic valve is repairable.
Salmasi MY, Chien L, Hartley P, et al., 2019, What is the safety and efficacy of the use of automated fastener in heart valve surgery?, J Card Surg, Vol: 34, Pages: 1598-1607
INTRODUCTION: Cor-Knot automated fastener has been used as an adjunct in heart valve surgery to eliminate the need for manual tying during valve implantation. Although reduced operative time and facilitation for minimally invasive surgery are clear benefits, whether their use translates to improved patient outcome remains debatable. This study aims to review the safety and efficacy of automated fasteners in heart valve surgeries. METHOD: Specific searches were conducted via online medical databases (Pubmed, Embase, Ovid) between 1950 and June 2019. Longitudinal studies were included that provided operative parameters. RESULTS: The initial literature search identified 3773 articles, but only eight met the inclusion criteria and were used for analysis: four studies related to aortic valve replacement (AVR), four related to mitral valve (MV) intervention (total n = 810). The meta-analysis revealed the significantly shorter aortic cross-clamp time in the Cor-knot group compared to manual tying, both in AVR and MV surgeries (P < .05). Cardiopulmonary bypass time was significantly shorter in the Cor-knot group when analyzing studies in MV surgery (weighted mean difference [WMD]: 110.0; 95% confidence interval: 12.3-207.7; P = .027) The use of Cor-Knot did not increase the risk of permanent pacemaker implantation, paravalvular leak, and 30-day mortality. The majority of studies reported no change in the length of intensive unit care and total hospital stay. CONCLUSION: We confirmed that the majority of existing literatures indicated the safety and intraoperative efficacy with automated fastener application. Nevertheless, there is currently no evidence to support automated fastened sutures can translate its intraoperative advantages to improved patient outcome.
Garas G, Darzi A, Athanasiou T, 2019, Author response to: Resection margin status in pancreatic cancer surgery: is it really less important than the N status?, British Journal of Surgery, Vol: 106, Pages: 1559-1560, ISSN: 0007-1323
Garas G, Darzi A, Athanasiou T, 2019, Comment on: Relationship between surgeons and industry, British Journal of Surgery, Vol: 106, Pages: 1560-1560, ISSN: 0007-1323
Garas G, Cingolani I, Patel V, et al., 2019, Evaluating the implications of Brexit for research collaboration and policy: A network analysis and simulation study, BMJ Open, Vol: 9, Pages: 1-11, ISSN: 2044-6055
Objective To evaluate the role of the European Union (EU) as a research collaborator in the United Kingdom (UK)’s success as a global leader in healthcare research and innovation and quantify the impact that Brexit may have. Design Network and regression analysis of scientific collaboration, followed by simulation models based on alternative scenarios. Setting International real world collaboration network among all countries involved in robotic surgical research and innovation.Participants 772 organisations from industry and academia nested within 56 countries and connected through 2,397 collaboration links.Main outcome measures Research impact measured through citations, innovation value measured through the innovation index, and an array of attributes of social networks to measure brokerage and geographical entropy at national and international levels.Results Globally, the UK ranks third in robotic surgical innovation, and the EU constitutes its prime collaborator. Brokerage opportunities and collaborators’ geographical diversity are associated with a country’s research impact (c=211.320 and 244.527, respectively;p-value<0·01) and innovation (c=18.819 and 30.850, respectively;p-value<0·01). Replacing EU collaborators with United States (US)’ ones is the only strategy that could benefit the UK, but on the condition that US collaborators are chosen among the top-performing ones, which is likely to be very difficult and costly, at least in the short term. Conclusions This study suggests what has long been argued, namely that the UK-EU research partnership has been mutually beneficial and that its continuation represents the best possible outcome for both negotiating parties. However, the uncertainties raised by Brexit necessitate looking beyond the EU for potential research partners. In the short-term, the UK’s best strategy might be to try and maintain its academic links with the EU. In the longer-term, strategic r
Moscarelli M, Fattouch K, Speziale G, et al., 2019, A meta-analysis of the performance of small tissue versus mechanical aortic valve prostheses., Eur J Cardiothorac Surg, Vol: 56, Pages: 510-517
OBJECTIVES: Small aortic prosthetic valves have been associated with suboptimal performance due to patient-prosthesis mismatch (PPM). This meta-analysis compared the outcomes of patients with a small root who received tissue versus mechanical aortic valves. METHODS: A systematic literature review identified 7 candidate studies; of these, 5 met the meta-analysis criteria. We analysed outcomes for a total of 680 patients (227 tissue valves and 453 mechanical valves) using random effects modelling. Each study was assessed for heterogeneity and quality. The primary end point was mortality at follow-up. Secondary end points included intraoperative and postoperative outcomes, the rate of PPM and left ventricle mass regression and major cardiac and prosthesis-related adverse events at follow-up. RESULTS: There was no between-group difference in mortality at follow-up [incidence rate ratio 1, 95% confidence interval (CI) 0.50-2.01; P = 0.99]. The tissue group had a higher rate of PPM (odds ratio 17.19, 95% CI 8.6-25.78; P = 0.002) and significantly less reduction in ventricular mass (weighted mean difference 40.79, 95% CI 4.62-76.96; P = 0.02). There were no significant differences in the incidence of structural valve disease at follow-up compared to that in the mechanical valve group. There was also no between-group difference in aggregated adverse events at follow-up (P = 0.68). CONCLUSIONS: Tissue and mechanical valves were associated with similar mortality rates; however, patients receiving tissue valves had a higher rate of PPM and significantly less left ventricle mass regression. These findings indicate that patients receiving small tissue valves may require closer clinical surveillance than those receiving mechanical valves.
Modi HN, Singh H, Fiorentino F, et al., 2019, Association of residents' neural signatures with stress resilience during surgery, JAMA Surgery, Vol: 154, ISSN: 2168-6254
Importance: Intraoperative stressors may compound cognitive load, prompting performance decline and threatening patient safety. However, not all surgeons cope equally well with stress, and the disparity between performance stability and decline under high cognitive demand may be characterized by differences in activation within brain areas associated with attention and concentration such as the prefrontal cortex (PFC). Objective: To compare PFC activation between surgeons demonstrating stable performance under temporal stress with those exhibiting stress-related performance decline. Design, Setting, and Participants: Cohort study conducted from July 2015 to September 2016 at the Imperial College Healthcare National Health Service Trust, England. One hundred two surgical residents (postgraduate year 1 and greater) were invited to participate, of which 33 agreed to partake. Exposures: Participants performed a laparoscopic suturing task under 2 conditions: self-paced (SP; without time-per-knot restrictions), and time pressure (TP; 2-minute per knot time restriction). Main Outcomes and Measures: A composite deterioration score was computed based on between-condition differences in task performance metrics (task progression score [arbitrary units], error score [millimeters], leak volume [milliliters], and knot tensile strength [newtons]). Based on the composite score, quartiles were computed reflecting performance stability (quartile 1 [Q1]) and decline (quartile 4 [Q4]). Changes in PFC oxygenated hemoglobin concentration (HbO2) measured at 24 different locations using functional near-infrared spectroscopy were compared between Q1 and Q4. Secondary outcomes included subjective workload (Surgical Task Load Index) and heart rate. Results: Of the 33 participants, the median age was 33 years, the range was 29 to 56 years, and 27 were men (82%). The Q1 residents demonstrated task-induced increases in HbO2 across the bilateral ventrolateral PFC (VLPFC) and right dorsolateral P
Kalogerakos PD, Kontopodis N, Ioannou CV, et al., 2019, Hemodynamics and reverse remodeling associated with Mosaic, Perimount and Trifecta aortic bioprostheses., Expert Rev Med Devices, Vol: 16, Pages: 743-751
Introduction: The implantation rate of aortic bioprostheses is increasing. Their durability has improved to some extent over the years and they allow for future transcatheter valve-in-valve deployment. In the lack of long term follow up, their hemodynamic profile, i.e. transvalvular mean pressure gradient and effective orifice area indexed, and the associated left ventricular reverse remodeling indexed are useful surrogates for clinical outcomes. Areas covered: A systematic review of the literature was conducted by searching Medline, Cochrane, Scielo, Embase databases, and grey literature until July 2018 for articles that perform comparisons among the three most popular aortic bioprostheses. Six randomized and 12 non-randomized studies were included with 565 patients receiving a Mosaic, 1334 a Perimount and 557 a Trifecta valve. These articles are heterogeneous but they allow the meta-analytic comparison of the abovementioned outcomes. Expert opinion: Compared to the Perimount valve, the Mosaic is hemodynamically inferior, while the Trifecta is superior. Despite these statistically significant differences, the left ventricular mass regression indexed, that is indicative of reverse remodeling, was comparable in all groups. All patients were similarly benefited. The predilection among these valves is fueled by their hemodynamic profile but not supported by the comparable reverse remodeling.
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