The role of echocardiography in fetal tachyarrhythmia diagnosis. A burden for the pediatric cardiologist and a review of the literature.

2017 ◽  
Vol 19 (2) ◽  
pp. 232 ◽  
Author(s):  
Liliana Gozar ◽  
Claudiu Marginean ◽  
Rodica Toganel ◽  
Iolanda Muntean
Keyword(s):  
Supraventricular Tachycardia ◽  
Accessory Pathway ◽  
Simultaneous Recording ◽  
Different Types ◽  
Atrioventricular Reentry Tachycardia ◽  
The Difference ◽  
Fetal Tachyarrhythmia ◽  
Reentry Tachycardia ◽  
Atrial Ectopic Tachycardia

Supraventricular tachyarrhythmia represents the most frequent fetal dysrhythmia. In the lack of diagnosis and treatment these fetuses may develop hydrops and even death. For the therapeutic approach it is important to establish the diagnosis of the type of supraventricular tachycardia. In this paper we report 29 cases with different types of supraventricular tachycardia in which the diagnosis was established using our own protocol, which allowed us to make the difference between the types of tachycardia (atrioventricular reentry tachycardia due to the accessory pathway, atrial ectopic tachycardia and permanent junctional reciprocal tachycardia). We acquired the data by a series of recordings in M mode and pulsed Doppler by simultaneous recording of an artery and a vein flow. First of all, we diagnosed the supraventricular tachycardia type, with short or long ventriculoarterial interval, and afterwards, we made the difference between atrial ectopic tachycardia and permanent junctional reciprocal tachycardia using methods to decrease the atrioventricular conduction.

Freezing of Cells: Role of Ice and Solutes in Cell Damage

2007 ◽  
Author(s):  
Hiroshi Takamatsu
Keyword(s):  
Mechanical Stress ◽  
Cell Damage ◽  
Cellular Damage ◽  
Elevated Concentration ◽  
Cellular Injury ◽  
Extracellular Solution ◽  
Different Types ◽  
A Cell ◽  
The Difference

The mechanism of cellular damage associated with freezing of biological cells is discussed by summarizing the author’s recent studies that consists of four different types of experiments. The “solution effects” that designate the influence of elevated concentration of electrolytes during freezing is examined first by a nonfreezing experiment that exposes cells to hypertonic solutions using a perfusion microscope. The cell damage due to the solution effect is evaluated directly from a pseudo-freezing experiment, where cells were subjected to the milieu that simulated a freeze-thaw process in the absence of ice. Contribution of ice formed in the extracellular solution is then estimated from the difference in cell survival between the pseudo-freezing experiment and a corresponding freezing experiment. The cellular injury by the mechanical stress is also examined independently by a cell deformation experiment, which mimicked the situation that cells are compressed and deformed between ice crystals. This experiment was designed to examine a complex effect of mechanical stress from ice and elevated concentration of electrolytes. Based on all these experiments, the role of concentrated solutes and ice is revealed as a function of freezing conditions.

Different Types of Business-to-Business Integration

2011 ◽  
pp. 1-17
Author(s):  
Frank Goethals ◽  
Jacques Vandenbulcke ◽  
Wilfried Lemahieu
Keyword(s):  
Web Services ◽  
Extended Enterprise ◽  
Enterprise Integration ◽  
Different Types ◽  
The Difference ◽  
Business To Business

In this chapter we argue that there exist two basic forms of business-to-business integration (B2Bi), namely extended enterprise integration and market B2Bi. This chapter clarifies the meaning of both concepts, shows that the difference between both is fundamental, and discusses the consequences of the difference in the realm of Web services development. The importance of coordination and the role of standards are studied for both types of e-business. The authors hope this chapter clearly shows the foundations of B2Bi and that the chapter as such brings clarity into B2Bi practices.

scholarly journals An Analysis of Differences in the Role of Friendships and the School Class in Children’s Perceptions of Bullying in England and Ijime in Japan: A Translation and Expansion of Kanetsuna (2009)

2021 ◽  
Vol 18 (15) ◽  
pp. 8234
Author(s):  
Tomoyuki Kanetsuna ◽  
Peter K. Smith
Keyword(s):  
Secondary School ◽  
Comparative Study ◽  
English Translation ◽  
School Class ◽  
Friendship Formation ◽  
Different Types ◽  
The Difference ◽  
Perceptions Of Bullying ◽  
The Impact

This is an English translation with some expansion of the article originally published in Japanese as a university bulletin in 2009. Previous research has found both differences and similarities between ijime in Japan and bullying in England. Bullying is often by pupils in different classes or higher year groups whom the victim does not know very well; ijime is often by victims’ classmates whom the victim knows very well. However, it has not been shown whether these differences are found for all types of bullying, or how they relate to friendships generally and the impact of differing school systems. We aimed to see whether previously found differences between ijime and bullying could be replicated, and, if so, whether they held for six different types of victimization, and whether friendship characteristics were consistent with explaining why they occur. To investigate the role of friendships and their location, 1036 Japanese and 931 English secondary school pupils participated in a comparative study of perceptions of bullying and ijime. The previous differences were confirmed and found to hold irrespective of type of bullying. Japanese pupils mainly formed friendships on a class basis, English pupils on a broader basis including pupils in different years. In school, English pupils spent much time in the playground with their friends and saw this as a likely venue for bullying, whereas Japanese pupils spent more time in the classroom and saw this as a likely venue for ijime. The difference in friendship formation, together with differences in the organization of class-based teaching in the two countries, are hypothesized to play a significant role in explaining some differences between bullying and ijime.

Guides on the side? Tasks and challenges for teachers in telecollaborative projects

ReCALL ◽  
2004 ◽  
Vol 16 (1) ◽  
pp. 5-19 ◽  
Author(s):  
ROBERT O'DOWD ◽  
KATRIN EBERBACH
Keyword(s):  
Language Learning ◽  
Language Learners ◽  
Review Of The Literature ◽  
Intercultural Learning ◽  
Message Boards ◽  
Good Working ◽  
Different Types ◽  
On Line ◽  
The Difference

This paper reports on research carried out on an intercultural telecollaborative exchange between language learners in Germany and Ireland and focuses particularly on what was required of the teachers in the development of the project. The review of the literature looks at the role of telecollaboration within the field of network-based language learning and also offers an overview of the different types of interaction which have been identified on on-line message boards. Following that, the different tasks of the teachers in the German-Irish exchange are explored. These include developing learners’ understanding of intercultural learning, improving learners’ ability to make effective contributions to the on-line interaction, increasing their awareness of the difference between on-line monologues and dialogues and finally, establishing a good working relationship with the partner teacher. Based on these findings, recommendations are outlined on how to prepare teachers for telecollaborative projects.

Different Types of Business-to-Business Integration

2011 ◽  
pp. 137-151
Author(s):  
Frank Goethals ◽  
Jacgues Vandenbulcke ◽  
Wilfried Lemahieu ◽  
Monique Snoeck
Keyword(s):  
Web Services ◽  
Extended Enterprise ◽  
Enterprise Integration ◽  
Different Types ◽  
The Difference ◽  
Business To Business

In this chapter we argue that there exist two basic forms of business-to-business integration (B2Bi), namely extended enterprise integration and market B2Bi. This chapter clarifies the meaning of both concepts, shows that the difference between both is fundamental, and discusses the consequences of the difference in the realm of Web services development. The importance of coordination and the role of standards are studied for both types of e-business. The authors hope this chapter clearly shows the foundations of B2Bi and that the chapter as such brings clarity into B2Bi practices.

Permanent junctional reciprocating tachycardia

ESC CardioMed ◽  
2018 ◽  
pp. 2092-2094
Author(s):  
Hildegard Tanner
Keyword(s):  
Atrial Tachycardia ◽  
Accessory Pathway ◽  
Age Groups ◽  
P Waves ◽  
Atrioventricular Nodal Reentry Tachycardia ◽  
Atrioventricular Reentry Tachycardia ◽  
Focal Atrial Tachycardia ◽  
Children And Young Adults ◽  
Tachycardia Induced Cardiomyopathy ◽  
Reentry Tachycardia

The term permanent junctional reciprocating tachycardia (PJRT) describes an orthodromic atrioventricular reentry tachycardia using a usually concealed slowly conducting accessory pathway with decremental properties as the retrograde limb. The accessory pathway is most commonly located in the posteroseptal region; however, other locations have been described. PJRT is a rare form of supraventricular tachycardia and can be found in all age groups but the majority of affected patients are children and young adults. The 12-lead electrocardiogram during PJRT shows negative P waves in the inferior lead II, III, and aVF, with a long RP interval. Atypical atrioventricular nodal reentry tachycardia and focal atrial tachycardia are important differential diagnoses. Due to the often incessant nature of PJRT, patients may be at risk for tachycardia-induced cardiomyopathy. Whereas pharmacological treatment is often only moderately effective, catheter ablation of the accessory pathway is highly effective with a low complication rate.

4. Asking Questions

2017 ◽  
Author(s):  
Sandra Halperin ◽  
Oliver Heath
Keyword(s):  
Research Question ◽  
Research Process ◽  
The Other ◽  
General Question ◽  
Different Types ◽  
Asking Questions ◽  
Research Questions ◽  
The Difference ◽  
The One

This chapter deals with the first step of the research process: the formulation of a well-crafted research question. It explains why political research should begin with a research question and how a research question structures the research process. It discusses the difference between a topic or general question, on the one hand, and a focused research question, on the other. It also considers the question of where to find and how to formulate research questions, the various types of questions scholars ask, and the role of the ‘literature review’ as a source and rationale for research questions. Finally, it describes a tool called the ‘research vase’ that provides a visualization of the research process, along with different types of questions: descriptive question, explanatory question, predictive question, prescriptive question and normative question.

Visual figure–ground discrimination in the honeybee: the role of motion parallax at boundaries

1990 ◽  
Vol 238 (1293) ◽  
pp. 331-350 ◽  
Keyword(s):  
Apparent Motion ◽  
Motion Parallax ◽  
The Other ◽  
Neural Models ◽  
Height Difference ◽  
Sugar Water ◽  
Different Types ◽  
Series Of Experiments ◽  
The Difference

Free flying bees were trained to collect a reward of sugar-water from a structured figure, placed at a randomly varying location on a sheet of transparent Perspex, positioned 5 cm above a structured Background. During subsequent tests, done in the absence of a reward, the bees’ landings on the boundaries of the figure, as well as within the figure and outside it, were recorded. The same bees were also tested with the figure placed directly on the background, thus eliminating the difference in height between the figure and the background. The results of both types of tests were then compared to identify and investigate the cues that bees use to detect a structured figure, when presented over a structured background. The structure of both the figure and the background were varied in a series of experiments, training a fresh group of bees in each experiment. A randomly structured figure presented against a randomly structured background cannot be detected by the bees unless it is raised above the background. A height difference of 2 cm is sufficient to elicit a rate of landings on the figure that is significantly higher than the chance level. The detectability of the figure does not depend upon the shape of the figure or on differences in density between the structures of the figure and the background. Thus, in detecting the raised figure, the only cue used by the bees appears to be the apparent motion of the figure relative to the background. The majority of landings on a raised figure occur at its boundaries. This shows that the visual stimulus that is crucial in detecting the figure is the local discontinuity in apparent motion that occurs at the boundary. We refer to this as ‘boundary parallax ’. In a series of experiments that used a striped background and a variety of structured figures, three different types of boundary parallax were offered to the bees. These were: (i) ‘covering parallax’, at a boundary in which stripes on either side of the boundary are parallel to the boundary; (ii) ‘shearing parallax’, in which stripes on either side are perpendicular to the boundary and (iii) ‘orthogonal parallax’, in which the stripes on one side are perpendicular to those on the other side. The bees performed very well at detecting raised boundaries that offered covering or shearing parallax, despite the fact that such boundaries are not readily discernible on the basis of their static geometry. On the other hand, bees performed poorly in detecting raised boundaries that offered orthogonal parallax, despite the fact that such boundaries are geometrically quite vivid to the human eye. We propose two neural models for the detection of boundary parallax that account for the sensitivity of bees to covering and shearing parallax and their insensitivity to orthogonal parallax.

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