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  • 1990-1994  (6)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 5348-5355 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Radiofrequency Ablation of Pseudo-Mahaim Fibers. Introduction: A young woman with refractory recurrent supraventricular tachycardia was referred for catheter ablation. Methods and Results: Electrophysiologic studies revealed the mechanism of tachycardia to be atrioventricular (AV) reentry, utilizing a decrementally conducting atriofascicular accessory pathway as the anterograde limb of the circuit and the normal intraventricular conducting system as the retrograde limb. Pace mapping in the right atrium during sinus rhythm suggested an atrial origin of the accessory pathway several centimeters distant from the AV node. Multiple radiofrequency lesions at the distal insertion of the accessory pathway in or near the right bundle branch failed to abolish preexcitation. In contrast, radiofrequency current applied to the ventricular side of the anterolateral tricuspid ring, adjacent to the atrial origin of the accessory pathway, was successful in abolishing preexcitation and inducible supraventricular tachycardia without affecting AV nodal conduction. Conclusion: Radiofrequency ablation can provide curative therapy for intractable supraventricular tachycardia due to decrementally-conducting atriofascicular accessory pathways. The risk of AV block in such patients as a consequence of the procedure should be quite low.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 5 (1994), S. 0 
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Atrioventricular Conduction Variability. Introduction: Atrioventricular AV) conduction time varies on a beat-by-beat basis in response to the influences of cardiac efferent autonomic activity and rate-dependent electrical recovery processes. The goals of this study were to distinguish these effects on AV conduction time and to compare the variability in sinoatrial and AV nodal function. Methods and Results: The PR interval on the surface ECG served as an index of AV conduction time in this study of 14 adult human subjects undergoing a random interval breathing protocol. P and R waves were located by a template-matching algorithm. Spectral analysis allowed frequency-domain comparisons between PR and RR interval variability. Spectra of PR and RR intervals had similar power distributions, although the power of the RR interval spectra was much greater. Autonomic blockade with atropine plus propranolol reduced the power of both spectra. Standing significantly decreased the spectral power from 0.15 to 0.5 Hz for PR and RR spectra, and introduced a peak near 0.1 Hz in the mean PR and RR spectra, although the latter finding was significant only for the RR interval spectra. Propranolol had no significant effects on the PR and RR interval spectra. Linear regression analysis allowed quantification of the autonomic and recovery effects on AV conduction and showed which effect predominated. Simple linear regression confirmed in adults a previous finding in children that conduction time may be either positively or negatively correlated with cycle length. By multiple regression and transfer function analysis, the inverse relation seen in some subjects was attributed to the effect of recovery from the preceding cycle. With the preceding recovery period accounted for, the conduction time and cycle length of the current beat were positively correlated, presumably due to the parallel autonomic effects on the sinoatrial and AV nodes. The magnitude of the recovery effect predicted by the regression analysis was similar to published values. Conclusion: A noninvasive evaluation of the surface ECG can be used to compare variability in AV conduction time and cycle length and characterize the effects of autonomic efferent activity and rate-related recovery on AV nodal function.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Counterflow centrifugal elutriation (CCE), which sorts cells on the basis of size and density, can enrich for haematopoietic progenitors in mice and humans10'11. In addition, CCE is an effective technique for depleting T lymphocytes from allogeneic bone marrow grafts as prophylaxis against ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of clinical monitoring and computing 10 (1994), S. 11-20 
    ISSN: 1573-2614
    Keywords: Blood pressure ; pediatric intensive care
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Medicine
    Description / Table of Contents: Résumé Objectifs. Le but de cette étude est d'estimer la précision, l'erreur, et la réponse en fréquence du monitorage continu de la pression artérielle chez les enfants à l'aide d'une méthode de photopléthysmographie au doigt.Méthodes. Pour comparer la mesure de pression artérielle par le procédé Finapres avec la mesure simultanée intra-artérielle, nous avons étudié en post-opératoire 27 patients pédiatriques non sélectionnés, qui ont reçu une variété d'agents inotropes et vaso-actifs dans une unité de soins intensifs cardiologiques d'une hôpital universitaire.Résultats. Soixante-deux des 66 tentatives (94%) d'obtention d'un signal de pression artérielle non-invasif furent couronnées de succès. Un total de 37 351 paires de mesures de pression artérielle en provenance de 53 enregistrements ont été comparées, révélant une erreur de mesure de −18,6 mmHg pour la pression artérielle systolique et de −13,4 mmHg pour la pression artérielle diastolique. L'erreur de mesure augmentait proportionnellement avec la pression artérielle, avec des pentes de 0,86 et 0,75 mmHg/mmHg, respectivement pour la pression artérielle systolique et pour la pression artérielle diastolique. La variation de l'erreur durant chaque période d'enregistrement, mesurée par l'écart-type de l'erreur, était faible (2,9 mmHg pour les mesures systoliques et 2,0 mmHg pour les mesures diastoliques). La réponse en fréquence entre les ondes de pression intraartérielles et non-invasives était plate à 10Hz et approximativement égal à 1.Conclusions. Une erreur de mesure non négligeable existe entre cette techniques de mesure non-invasive de la pression artérielle et la mesure intra-artérielle. Les mesures de la variabilité intra-patient et de l'analyse de réponse en fréquence suggèrent que la technique non-invasive indique précisément la tendance de pression artérielle à court terme. Cette technique peut avoir des applications utiles dans des environnements où le monitorage intraartériel est à éviter ou impossible à obtenir.
    Abstract: Abstrakt Zielsetzung. Ziel der Untersuchung war es, die Genauigkeit, Abweichung und die das Frequenzverhalten einer kontinuierlichen Blutdruckmessung mit Hilfe der Fingerplethysmographie bei Kindern zu bestimmen.Methodik. Um den mit Hilfe des Finipres® gemessenen arteriellen Blutdruck mit dem gleichzeitig gemessenen intraarteriellen Blutdruck zu vergleichen, wurden randomisiert, postoperativ 27 Kinder, die unterschiedlich inotrope und vasoaktive Medikamente auf der Herzintensivstation eines an die Universität angeschlossenen Kinderspitals erhielten, untersucht.Ergebnisse. 62 der insgesamt 66 durchgeführten nichtinvasiven Blutdruckmessungen (94%) waren erfolgreich. Insgesamt wurden 37351 gepaarte Blutdruckmessungen aus 53 Aufzeichnungen verglichen. Hierbei war einen Abweichung von −18.6 mmHg für den systolischen Blutdruck und −13.4 mmHg für den diastolischen Blutdruck nachweisbar. Diese Abweichung nahm proportional mit steigendem Blutdruck zu, wobei eine Differenz zwischen der nichtinvasiven und der intraarteriellen Messung im sowohl systolischen als auch der diastolischen Blutdruck von+0.86 mmHg respektive +0.75 mmHg bestand. Die Abweichung während jeder Messung war, was sich in der Standardabweichung der Messungen niederschläug, eher gering (mittlere σsystolisch=2.9 mmHg; mittlere σdiastolisch=2.0 mmHg). Das Frequenzverhalten zwischen der intraarteriellen und der nichtinvasiven Druckkurve war mit 10m Hz flach und kam dem Wert 1 nahe.Schlussfolgerung. Es besteht eine beträchtliche Abweichung zwischen der nichtinvasiven Blutdruckmessmethode und der intraarteriellen Bludruckmessung. Die vorgenommen Daten zur intraindividuellen Variabilität und dem Frequenzverhaltren lassen jedoch die Aussage zu, daß die nichtinvasive Technik ausreichend genau den intraarteriellen Blutdruck über einen kurzen Zeitverlauf widerspiegelt. Diese Technik ist in den Fällen nützlich, wo ein intraarterielles Monitoring nicht geünwscht wird oder nicht möglich ist.
    Notes: Abstract Objective. The purpose of this study was to estimate the accuracy, bias, and frequency response of continuous blood pressure monitoring using finger photoplethysmography in children.Methods. To compare arterial blood pressure measured using the Finapres device with simultaneously measured intraarterial blood pressure we studied 27 randomly selected postoperative pediatric patients who were receiving a variety of inotropic and vasoactive agents at a cardiac intensive care unit in university-affiliated pediatric hospital.Results. Sixty-two of 66 attempts (94%) to obtain a noninvasive blood pressure measurement were successful. A total of 37,351 paired blood pressure measurements from 53 records were compared, revealing a measurement bias of −18.6 mm Hg for systolic blood pressure and −13.4 mm Hg for diastolic blood pressure. The measurement bias increased proportionately to blood pressure, with systolic and diastolic gains between the noninvasive and intraarterial techniques of 0.86 and 0.75 mm Hg/mm Hg, respectively. The variation bias during each recording epoch, as measured by standard deviation of bias, was low (mean σsystolic=2.9 mm Hg; mean σdiastolic=2.0 mm Hg). The frequency response between the intraarterial and noninvasive pressure waveforms was flat to 10 Hz and approximately equal to 1.Conclusions. Substantial measurement bias exists between this noninvasive blood pressure measurement technique and intraarterial blood pressure. Measurements of the intrapatient variability and frequency response analysis suggest that the noninvasive technique accurately tracks intraarterial blood pressure over the short term. This technique may have useful applications in settings where intraarterial monitoring is undesirable or unobtainable.
    Type of Medium: Electronic Resource
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