Τετάρτη 4 Νοεμβρίου 2020

Anatomy of Mitral Valve Complex as Revealed by Non-Invasive Imaging: Pathological, Surgical and Interventional Implications

Alexandros G.Sfakianakis shared this article with you from Inoreader

JCDD, Vol. 7, Pages 49: Anatomy of Mitral Valve Complex as Revealed by Non-Invasive Imaging: Pathological, Surgical and Interventional Implications

Journal of Cardiovascular Development and Disease doi: 10.3390/jcdd7040049

Authors: Laura Anna Leo Vera Lucia Paiocchi Susanne Anna Schlossbauer Elisa Gherbesi Francesco F. Faletra

Knowledge of mitral valve (MV) anatomy has been accrued from anatomic specimens derived by cadavers, or from direct inspection during open heart surgery. However, today two-dimensional and three-dimensional transthoracic (2D/3D TTE) and transesophageal echocardiography (2D/3D TEE), computed tomography (CT) and cardiac magnetic resonance (CMR) provide images of the beating heart of unprecedented quality in both two and three-dimensional format. Indeed, over the last few years these non-invasive imaging techniques have been used for describing dynamic cardiac anatomy. Differently from the “dead” anatomy of anatomic specimens and the “static” anatomy observed during surgery, they have the unique ability of showing “dynamic” images from beating hearts. The “dynamic” anatomy gives us a better awareness, as any single anatomic arrangement corresponds perfectly to a specific function. Understanding normal an atomical aspects of MV apparatus is of a paramount importance for a correct interpretation of the wide spectrum of patho-morphological MV diseases. This review illustrates the anatomy of MV as revealed by non-invasive imaging describing physiological, pathological, surgical and interventional implications related to specific anatomical features of the MV complex.

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The Mesenchymal Cap of the Atrial Septum and Atrial and Atrioventricular Septation

Alexandros G.Sfakianakis shared this article with you from Inoreader

JCDD, Vol. 7, Pages 50: The Mesenchymal Cap of the Atrial Septum and Atrial and Atrioventricular Septation

Journal of Cardiovascular Development and Disease doi: 10.3390/jcdd7040050

Authors: Ray Deepe Emily Fitzgerald Renélyn Wolters Jenna Drummond Karen De Guzman Maurice J.B. van den Hoff Andy Wessels

In this publication, dedicated to Professor Robert H. Anderson and his contributions to the field of cardiac development, anatomy, and congenital heart disease, we will review some of our earlier collaborative studies. The focus of this paper is on our work on the development of the atrioventricular mesenchymal complex, studies in which Professor Anderson has played a significant role. We will revisit a number of events relevant to atrial and atrioventricular septation and present new data on the development of the mesenchymal cap of the atrial septum, a component of the atrioventricular mesenchymal complex which, thus far, has received only moderate attention.

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Muscularization of the Mesenchymal Outlet Septum during Cardiac Development

Alexandros G.Sfakianakis shared this article with you from Inoreader

JCDD, Vol. 7, Pages 51: Muscularization of the Mesenchymal Outlet Septum during Cardiac Development

Journal of Cardiovascular Development and Disease doi: 10.3390/jcdd7040051

Authors: Maurice J. B. van den Hoff Andy Wessels

After the formation of the linear heart tube, it becomes divided into right and left components by the process of septation. Relatively late during this process, within the developing outflow tract, the initially mesenchymal outlet septum becomes muscularized as the result of myocardialization. Myocardialization is defined as the process in which existing cardiomyocytes migrate into flanking mesenchyme. Studies using genetically modified mice, as well as experimental approaches using in vitro models, demonstrate that Wnt and TGFβ signaling play an essential role in the regulation of myocardialization. They also show the significance of the interaction between cardiomyocytes, endocardial derived cells, neural crest cells, and the extracellular matrix. Interestingly, Wnt-mediated non-canonical planar cell polarity signaling was found to be a crucial regulator of myocardialization in the outlet septum and Wnt-mediated canonical β-catenin signaling is an essential r egulator of the expansion of mesenchymal cells populating the outflow tract cushions.

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Survey on Physicians’ Knowledge and Training Needs in Genetic Counseling

Alexandros G.Sfakianakis shared this article with you from Inoreader
Background: In recent years, germline testing of women with a risk of developing breast and ovarian cancer has increased rapidly. This is due to lower costs for new high-throughput sequencing technologies and the manifold preventive and therapeutic options for germline mutation carriers. The growing demand for genetic counseling meets a shortfall of counselors and illustrates the need to involve the treating clinicians in the genetic testing process. This survey was undertaken to assess their state of knowledge and training needs in the field of genetic counseling and testing. Methods: A cross-sectional survey within the European Bridges Study (Breast Cancer Risk after Diagnostic Gene Sequencing) was conducted among physician members (n = 111) of the German Cancer Society who were primarily gynecologists. It was designed to examine their experience in genetic counseling and testing. Results: Overall, the study revealed a need for training in risk communication and clinical recommendations for persons at risk. One-third of respondents communicated only relative disease risks (31.5%) instead of absolute disease risks in manageable time spans. Moreover, almost one-third of the respondents (31.2%) communicated bilateral and contralateral risk-reducing mastectomy as an option for healthy women and unilateral-diseased breast cancer patients without mutations in high-risk genes (e.g. BRCA1 or BRCA2). Most respondents expressed training needs in the field of risk assessment models, the clinical interpretation of genetic test results, and the decision-making process. Conclusion: The survey demonstrates a gap of genetic and risk literacy in a relevant proportion of physicians and the need for appropriate training concepts.
Breast Care
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Therapy Algorithms for the Diagnosis and Treatment of Patients with Early and Advanced Breast Cancer

Alexandros G.Sfakianakis shared this article with you from Inoreader
Background: In order to offer optimal treatment approaches based on available evidence, the Commission Breast of the Working Group Gynecologic Oncology (AGO) of the German Cancer Society developed therapy algorithms for eight complex treatment situations in primary and advanced breast cancer. Summary: Therapy algorithms for the following complex treatment situations are outlined in this paper: (neo)adjuvant therapy of human epidermal growth factor receptor 2 (HER2)-positive breast cancer; axillary surgery and neoadjuvant chemotherapy; adjuvant endocrine therapy in premenopausal patients; adjuvant endocrine therapy in postmenopausal patients; hormone receptor (HR)-positive/HER2-negative metastatic breast cancer: strategies; HR-positive/HER2-negative metastatic breast cancer: endocrine-based first-line treatment; HER2-positive metastatic breast cancer: first to third-line; metastatic triple-negative breast cancer. Key Messages: The therap y options shown in these algorithms are based on the current AGO recommendations updated in January 2020 but cannot represent all evidence-based treatment options. Prior therapies, performance status, comorbidities, patient preference, etc. must be taken into account for the actual treatment choice. Therefore, in individual cases, other evidence-based treatment options not listed here may also be appropriate and justified.
Breast Care
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Multistage Latissimus Dorsi Flap with Implant for Complex Post-Mastectomy Reconstruction: An Old but Still Current Technique

Alexandros G.Sfakianakis shared this article with you from Inoreader
Introduction: The latissimus dorsi (LD) flap has been used for reconstructing mastectomy defects since the early 1900s. Although its popularity has declined over the last decades, it still retains an important role in breast reconstruction. We present our recent experience with the multistage LD flap and implant for extremely complex post-mastectomy defects. Patients and Methods: Between 2011 and 2020, 42 consecutive patients underwent post-mastectomy LD reconstruction with an expander (STAGE 1). Some of them received prior fat-grafting of the mammary region (STAGE 0). All patients were scheduled for an expander-definitive implant change (STAGE 2). Some of them completed the program with fat-grafting, nipple and areola reconstruction, and other refinements (STAGE 3 or 4). Results: Two patients underwent fat-grafting at STAGE 0. Mean age at STAGE 1 was 46.7 years, mean BMI was 23.6, 14.4% of the patients were smokers, and 21.4% had comor bidities. Immediate reconstructions were performed in 35.7% and delayed in 64.3%. Mean surgical time at STAGE 1 was 194.7 min for delayed reconstructions and 242.3 min for immediate ones. Mean hospital stay for STAGE 1 procedures was 3.8 days; all other STAGES were performed as ambulatory surgery. No flap necrosis was observed and only 1 patient required a surgical revision for bleeding. Dorsal seroma occurred in 45.2% of cases. Conclusions: The multistage LD flap with implant is a useful and safe tool within the reconstructive armamentarium for post-mastectomy defects. It combines multiple simple procedures and does not require specific skills and surgical training (level of evidence 4).
Breast Care
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Τρίτη 3 Νοεμβρίου 2020

Ethical decision making when demand for intensive care exceeds available resources. The need for public discussion.

alkiviadis.1961 shared this article with you from Inoreader

By Tim Cook, Kim J Gupta, Robin Fackrell, Sarah Wexler, Bernie Marden

Early in the COVID-19 pandemic the first author of this blog wrote a Guardian article which was titled "ICU doctors now face the toughest decisions they will ever have to make." It referred to the possibility – then expected to be a reality – that the UK's intensive care resources would be insufficient to cope with the demands of the pandemic, and that doctors would be confronted with the need to make 'triage' decisions (a term from the battlefield) about which patients to treat in ICU when not all could be. At that time, it was common to hear it said that "doctors make these decisions all the time". In reality this is not true. In normal circumstances, as stated in the Guardian article, "doctors wrestle with decisions about what is right for the patient in front of them…but when resource-based triage occurs, the decisions become about what is in the "greater good" and "doing the best for the most."

In the Royal United Hospitals in Bath, as in other hospitals in the UK and beyond, we prepared for the mass influx of patients. We expanded our intensive care capacity, built up supplies, and retrained and redeployed staff. However, expectations and models still suggested that at the height of the pandemic demand would exceed resource significantly: specifically that there would be insufficient intensive care capacity in terms of beds, ventilators or staff to care for all patients who could benefit from it.

In this situation of national crisis, we hoped for clear national guidance on the principles that should be applied if medical demand exceeded medical resource. Several documents were produced but these were either treatises on the ethics of the matter or policy documents that tended to emphasise universal access and failed to directly address what actions to take when resources are inadequate. To be explicit, those decisions might include deciding which of two patients would be placed on a ventilator when two needed it and both would benefit but only one ventilator was available, or whether it would ever be acceptable to remove one patient from a ventilator to enable it to be used for another patient who had a better chance of survival. These are invidious situations – almost incomprehensible to talk or write about – but they were prominent in our thoughts in March. In the absence of national guidance, we needed either to develop a plan that could be enacted locally or simply let individual doctors use whatever personal mental and ethical resource they could summon when confronted with this dreadful situation. We chose the former.

A multidisciplinary group of individuals was brought together with medical, nursing, legal, lay and ethical experience. Together we pondered, discussed, and occasionally argued about what such a document should contain. Over a few weeks it took form and after reconsideration, consultation and revision, a working document was finalised. We hope we developed a document that enables structured, explicit, transparent decision-making in a situation we all hoped to avoid.

In the United Kingdom, during the first wave of the pandemic, the anticipated volume of patients requiring intensive care was ultimately mitigated by a three-fold approach. This involved a widespread, rapid expansion of intensive care capacity, a reduction of healthcare demand from non-COVID-19 sources by temporarily pausing much of normal healthcare delivery and by reduced demand through governmental and societal responses that included national lockdown. Service overload and the need for triage was thus narrowly avoided. But make no mistake, the system was severely stretched, and in some locations pushed close to breaking point.

Our triage document has fortunately not been required during the pandemic so far, and the document did not become hospital policy. However, it is not inconceivable that the document may yet be required. As winter approaches the NHS comes under the strain of 'normal winter pressures', compounded by an emerging second wave of COVID-19 activity, and a strong strategic desire to maintain normal NHS activity for as long as possible. National lockdown is also unlikely: schools, universities and many town centres will remain open. Winter, COVID-19 and routine services will all require and compete for the limited intensive care services. Preparations for national responses to manage increase ICU demand are well established, but it is not unthinkable that over this winter demand for services will overwhelm capacity and 'triage' documents yet may be needed at the bedside.

In an article in the Journal of Medical Ethics we have described how our document was created and we present the document itself. It is our strongly held position that creation of a document such as this is too important to be left to a few doctors and nurses in a single hospital. As part of the development process it was viewed and commented on by our local ethics advisory group – and greatly modified as a result. But we wanted to go further. The article in The Guardian stated "… we can't do this alone. If it becomes necessary, a framework to inform these decisions should be shared with the rest of society. In this urgent crisis we need a public discussion to help guide these difficult decisions, and clear advice from our medical, philosophical and political leaders." We have published the article and the document to be transparent and as a starting-point for stakeholder feedback and discussion. We welcome all comments and feedback, from ethicists and professio nals and anyone who is interested but especially from patients and the wider public.

Lastly, our paper has become particularly topical as several media outlets have raised claims and concerns that the elderly or chronically ill had reduced access to ICU admission in the first pandemic surge. Those concerns have included clams of extensive use of triage tools to control who might be considered for ICU admission. It is important not to conflate triage when ICU capacity still exists with its use in situations where there is insufficient resource, and such decisions are unavoidable. Our paper, and the triage tool it includes, relates only to the latter situation but we believe the discussion is none the less timely.

 

Paper title: Development of a structured process for fair allocation of critical care resources in the setting of insufficient capacity: a discussion paper. (Forthcoming)

Authors: Tim Cook, Kim Gupta, Christopher Dyer, Robin Fackrell, Sarah Wexler, Heather Boyes, Ben Colleypriest, Richard Graham, Helen Meehan, Sarah Merritt, Derek Robinson, Bernie Marden

Affiliations: Royal United Hospitals Bath NHS Foundation Trust, Combe Park, Bath

Competing interests: None

Social media accounts of post author: @doctimcook

The post Ethical decision making when demand for intensive care exceeds available resources. The need for public discussion. appeared first on Journal of Medical Ethics blog.

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