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  • 1
    Electronic Resource
    Electronic Resource
    Catheter Ablation for the Common Type of Atrial Flutter: Where Do We Stand? (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 9 (1996), S. 0 
    Details
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Atrial flutter is a reentrant tachycardia that originates in the right atrium. The wave front of atrial flutter travels craniocaudally along the anterolateral wall of the right atrium, surrounds the inferior vena cava, and crosses the region between this structure and the tricuspid ring before closing the. circuit after upward septal propagation. The area located between the tricuspid annulus and the inferior vena cava has been proposed as an ideal target for ablation because it appears to be an isthmus that is an obligatory route for closing the inferior part of the arrhythmia circuit. Various publications dealing with radiofrequency ablation of this tachycardia have dealt with different approaches, and a wide range of acute and chronic success rates have been reported. The main difficulty in interpreting the results of this series is the lack of a carefully defined patient selection, technique description, and follow-up protocol. In almost all of these series it clearly appears that a significant number of late flutter recurrences occur in these patients, in addition to the emergence of previously unknown atrial fibrillation. Many recent reports, where ablation has been targeted at the inferior vena cava-tricuspid annulus isthmus, have shown a high rate of acute, success. In our experience, the procedure seems to be facilitated by the use of extra large tip (8-mm) ablation catheters that allow the use of higher power outputs. Careful mapping of the ablation site has shown that creation of complete bidirectional block at the isthmus is important for prevention of late recurrences. Further technological improvements should aim at developing energy delivery systems that allow controlled destruction of wide areas of the atrial myocardium. (J Interven Cardiol 1996;9:35–44)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8183.1996.tb00593.x
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  • 2
    Electronic Resource
    Electronic Resource
    False-Positive Exercise Stress Electrocardiogram Due to Accessory Pathway in the Absence of Manifest Preexcitation (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Pacing and clinical electrophysiology 23 (2000), S. 0 
    Details
    ISSN: 1540-8159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: False-positive exercise testing in patients with an accessory pathway has been described only in patients with manifest preexcitation during exercise. We describe a patient in whom marked ST-segment changes were seen during an exercise test in the absence of any preexcitation of the QRS complexes. The role of the accessory pathway in producing the ST changes was reaffirmed by absence of this abnormality following catheter ablation of the accessory pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8159.2000.tb00897.x
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  • 3
    Electronic Resource
    Electronic Resource
    Electrocardiographic Patterns and Results of Radiofrequency Catheter Ablation of Clockwise Type I Atrial Flutter (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 7 (1996), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Clockwise Rotation of Atrial Flutter. Introduction: Counterclockwise right atrial propagation is usually observed in common atrial flutter, but little is known regarding flutter with clockwise right atrial rotation. The aim of this study is to describe the ECG characteristics and results of catheter ablation of atrial flutter with clockwise right atrial rotation. Methods and Results: Among the 38 patients with type I atrial flutter in this study population, right atrial impulse propagation was counterclockwise in 20 and clockwise in 8. In the remaining 10 patients, both clockwise and counterclockwise patterns were seen. Clinical and ECG parameters associated with clockwise flutter were compared to those of 28 cases of counterclockwise atrial flutter. Ablation was performed in 11 of 18 cases using a technique identical to that used for counterclockwise flutter. A classical “sawtooth” pattern of the flutter wave was observed in 28 of 28 counterclockwise and 14 of 18 clockwise flutter. A shorter plateau phase, a widening of the negative component of the F wave in the inferior leads, and a negative F wave in V1 were the most consistent findings in clockwise flutter. Coronary sinus recording always showed septal to lateral left atrial impulse propagation. Ablation was successful in 11 of 11 cases of clockwise flutter in whom this procedure was performed, with 9.5 ± 11.6 radiofrequency pulses delivered between the tricuspid valve and the coronary sinus ostium (n = 5) or the inferior vena cava (n = 5), and in the proximal coronary sinus (n = 1). After a follow-up of 46.6 weeks, two recurrences of clockwise flutter were encountered, which were successfully treated with a second session. Conclusion: Contrary to commonly accepted concepts, clockwise rotation of atrial flutter Ls not an infrequent phenomenon and can mimic counterclockwise rotation. It can also be successfully ablated by radiofrequency pulses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1996.tb00467.x
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  • 4
    Electronic Resource
    Electronic Resource
    Short sums of certain arithmetic functions (1998)
    Springer
    Acta mathematica 180 (1998), S. 119-144 
    Details
    ISSN: 1871-2509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02392880
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  • 5
    Electronic Resource
    Electronic Resource
    Structures of Addition Products of Acetylenedicarboxylic Acid Esters with Various Dinucleophiles. An application of C, H-spin-coupling constants13C-NMR. Spectroscopy, Part 19. For Part 18 Sec [1]. (1978)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 61 (1978), S. 607-617 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocyclic compounds obtained by addition of acetylenedicarboxylic acid esters to thioureas, cyclic amidines and o-difunctionalized aromatic systems have been studied by 13C-NMR. In particular, C, H-spin-coupling constants over two and three bonds were used to differentiate between the various constitutional isomers and to establish the configuration of trisubstituted exocyclic C, C-double bonds. The configurational significance and diagnostic value of vicinal cis and trans C,H-spin coupling is again demonstrated in the present series.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19780610207
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    Paper (German National Licenses)
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