Should the proximal part of a bifurcated aortic graft be kept as short as possible? A computational studyelucidates onaortic graft hemodynamics for various main body lengths.

2021 ◽  
Author(s):  
Nikolaos Kontopodis ◽  
Konstantinos Tzirakis ◽  
Fotos Stylianou ◽  
Vasileios Vavourakis ◽  
George M Patou ◽  
...  
Keyword(s):  
Proximal Part ◽  
Main Body ◽  
Aortic Graft

Actin filaments in two spermatozoa of crustacea decapoda

1990 ◽  
Vol 48 (3) ◽  
pp. 70-71
Author(s):  
E. Dupré ◽  
G. Schatten
Keyword(s):  
Electron Microscopy ◽  
Actin Filaments ◽  
Low Voltage ◽  
Active Role ◽  
Main Body ◽  
Robinson Crusoe ◽  
Decapod Crustaceans ◽  
Actual Participation ◽  
Voltage Scanning ◽  
Scanning Electron

Sperm of decapod crustaceans are formed by a round or cup-shaped body, a complex acrosome and one a few appendages emerging from the main body. Although this sperm does not have motility, it has some components of the cytoskeleton like microtubules, which are found inside the appendages. Actin filaments have been found in the spike of penaeidae sperms. The actual participation of the crustacean decapod sperm cytoskeleton during fertilization is not well understood. Actin is supposed to play an active role in drawing the penaeidae shrimp sperm closer to the egg after bending of the spike. The present study was aimed at the localization of actin filaments in sperm of the Robinson Crusoe island lobster, Jasus frontalis and in the crayfish Orconectes propincus, by fluorescent probes and low voltage scanning electron microscopy.

Pulmonary Homografts for Aortic Valve Replacement: Long-term Comparison with Aortic Grafts

2011 ◽  
Vol 14 (4) ◽  
pp. 237 ◽  
Author(s):  
Ferdinand Vogt ◽  
Anke Kowert ◽  
Andres Beiras-Fernandez ◽  
Martin Oberhoffer ◽  
Ingo Kaczmarek ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Aortic Valve Replacement ◽  
Valve Replacement ◽  
Survival Rates ◽  
Long Term Results ◽  
Rank Test ◽  
Aortic Graft ◽  
Valve Prostheses ◽  
Retrospective Comparative Study

<p><b>Objective:</b> The use of homografts for aortic valve replacement (AVR) is an alternative to mechanical or biological valve prostheses, especially in younger patients. This retrospective comparative study evaluated our single-center long-term results, with a focus on the different origins of the homografts.</p><p><b>Methods:</b> Since 1992, 366 adult patients have undergone AVR with homografts at our center. We compared 320 homografts of aortic origin and 46 homografts of pulmonary origin. The grafts were implanted via either a subcoronary technique or the root replacement technique. We performed a multivariate analysis to identify independent factors that influence survival. Freedom from reintervention and survival rates were calculated as cumulative events according to the Kaplan-Meier method, and differences were tested with the log-rank test.</p><p><b>Results:</b> Overall mortality within 1 year was 6.5% (21/320) in the aortic graft group and 17.4% (8/46) in the pulmonary graft group. In the pulmonary graft group, 4 patients died from valve-related complications, 1 patient died after additional heterotopic heart transplantation, and 1 patient who entered with a primary higher risk died from a prosthesis infection. Two patients died from non-valve-related causes. During the long-term follow-up, the 15-year survival rate was 79.9% for patients in the aortic graft group and 68.7% for patients in the pulmonary graft group (<i>P</i> = .049). The rate of freedom from reoperation was 77.7% in the aortic graft group and 57.4% in the pulmonary graft group (<i>P</i> < .001). The reasons for homograft explantation were graft infections (aortic graft group, 5.0%; pulmonary graft group, 6.5%) and degeneration (aortic graft group, 7.5%; pulmonary graft group, 32.6%).</p><p><b>Conclusion:</b> Our study demonstrated superior rates of survival and freedom from reintervention after AVR with aortic homografts. Implantation with a pulmonary graft was associated with a higher risk of redo surgery, owing to earlier degenerative alterations.</p>

Angioscopic Evaluation of an Endoluminal Aortic Graft: The First Clinical Experience

1995 ◽  
Vol 2 (3) ◽  
pp. 248-254 ◽  
Author(s):  
Bradley B. Hill ◽  
Richard Neville ◽  
Gordon L. Hyde ◽  
Chien-Suu Kuo ◽  
Edward B. Diethrich
Keyword(s):  
Clinical Experience ◽  
Aortic Graft

Performing a PCI through a trifurcated aortic graft: a new challenging access route

2020 ◽  
Vol 68 (5) ◽  
Author(s):  
Gregorio Menzà ◽  
Fabrizio D'Ascenzo ◽  
Matteo Attisani ◽  
Michele La Torre ◽  
Fabio Verzini ◽  
...  
Keyword(s):  
Access Route ◽  
Aortic Graft

Possibility of simultaneous transposition of segments of the pectoralis major muscle to restore flexion in the shoulder and elbow joints (clinical observation)

MedAlliance ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 61-68
Keyword(s):  
Anterior Part ◽  
Pectoralis Major Muscle ◽  
Elbow Flexion ◽  
Functional Results ◽  
Proximal Part ◽  
Deltoid Muscle ◽  
Pectoralis Major ◽  
Orthopedic Surgeons ◽  
Active Function ◽  
Head Neck

The pectoralis major is a widely used muscle in reconstruction surgery for replacement soft tissue defects of a head, neck, thorax, upper limbs and restoration of muscle active function. The peculiarities of anatomy of the pectoralis major makes it possible to divide the muscle into several segments with their own innervations and supply and use them independently from each other. This article describes the anatomy of the pectoralis major and the opportunity for clinical applications of different segments of this muscle. The authors demonstrate the result of the restoration of shoulder and elbow flexion in a patient with arthrogryposis due to simultaneous transfer of the proximal part of pectoralis major to the anterior part of the deltoid muscle and the distal part of pectoralis major to the biceps with good functional results. The article will be useful for plastic surgeons, orthopedic surgeons and physiotherapists.

Review of Prelabor Rupture of the Membranes: Pathophysiologic Concepts and Novel Therapeutic Strategies

2020 ◽  
Vol 16 ◽  
Author(s):  
Saadia Ghafoor
Keyword(s):  
Management Strategies ◽  
Signs And Symptoms ◽  
Cochrane Library ◽  
Main Body ◽  
Scientific Publications ◽  
Timely Diagnosis ◽  
Narrative Literature Review ◽  
Contemporary Management ◽  
Online Library ◽  
Novel Therapeutic Strategies

Background:: Prelabor rupture of membrane (PROM) refers to the breakage of fetal membranes before the onset of labor, resulting in the leakage of amniotic fluid. PROM affects approximately 3% and 8% of preterm and term pregnancies. Because of associated high maternal and perinatal mortality, correct and timely diagnosis together with effective management is highly recommended to prevent adverse fetal and maternal outcomes. Objective:: To provide an overview of the novel concepts in the understanding of PROM including etiology, pathophysiology, risk factors, complications, assessment, diagnostic modalities, and contemporary management strategies for PROM at preterm and term. Methodology:: This narrative literature review was conducted through a literature search using the Cochrane library and electronic databases including PubMed, Web of Science, Medline, Scopus, Crossref, Google Scholar, Wiley online library, ScienceDirect with specific search terms in scientific publications published from March 1980 to March 2020. Main Body:: Preterm PROM has the potential to cause prenatal morbidity and mortality. It is imperative to monitor the signs and symptoms of an impending infection due to the risk of infectious morbidity with PROM at preterm and preterm. PROM at preterm and term requires prompt diagnosis followed by an appropriate management strategy. Conclusion:: The correct and timely diagnosis of PROM is essential for efficacious management. Furthermore, it can reduce avoidable emergent health care visits and related costs in a clinical setting subjected to pregnancy with suspected PROM. Further studies are needed to fill the gaps in identifying better diagnostic predictive tools in high- risk pregnancies.

scholarly journals New optically identified supernova remnants in the Large Magellanic Cloud

2020 ◽  
Vol 500 (2) ◽  
pp. 2336-2358
Author(s):  
Miranda Yew ◽  
Miroslav D Filipović ◽  
Milorad Stupar ◽  
Sean D Points ◽  
Manami Sasaki ◽  
...  
Keyword(s):  
Supernova Remnants ◽  
Supernova Remnant ◽  
Narrow Band Imaging ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Main Body ◽  
Found Objects ◽  
Type Ia ◽  
Optical Sample

ABSTRACT We present a new optical sample of three Supernova Remnants (SNRs) and 16 Supernova Remnant (SNR) candidates in the Large Magellanic Cloud (LMC). These objects were originally selected using deep H α, [S ii], and [O iii] narrow-band imaging. Most of the newly found objects are located in less dense regions, near or around the edges of the LMC’s main body. Together with previously suggested MCSNR J0541–6659, we confirm the SNR nature for two additional new objects: MCSNR J0522–6740 and MCSNR J0542–7104. Spectroscopic follow-up observations for 12 of the LMC objects confirm high [S ii]/H α emission-line ratios ranging from 0.5 to 1.1. We consider the candidate J0509–6402 to be a special example of the remnant of a possible type Ia Supernova (SN) which is situated some 2° (∼1.75 kpc) north from the main body of the LMC. We also find that the SNR candidates in our sample are significantly larger in size than the currently known LMC SNRs by a factor of ∼2. This could potentially imply that we are discovering a previously unknown but predicted, older class of large LMC SNRs that are only visible optically. Finally, we suggest that most of these LMC SNRs are residing in a very rarefied environment towards the end of their evolutionary span where they become less visible to radio and X-ray telescopes.

Sign in / Sign up

Export Citation Format

Share Document