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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Luminescence 18-19 (1979), S. 411-414 
    ISSN: 0022-2313
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Instruments and Methods 175 (1980), S. 10-11 
    ISSN: 0029-554X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-055X
    Keywords: Schlüsselwörter Nichtinvasive Blutdruckmessung ; Oszillometrie ; Geräteprüfung ; Dinamap 1846 ; HP M-1008B ; Intensivemedizin ; Simulator ; Key words Blood pressure measurement ; Oscillometric method ; Intensive care patients ; Performance test ; Simulator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Using the PTB simulator, which emits real signals from patients, we examined the precision of the oscillometric blood pressure measurement with the Dinamap 1846 (Critikon) and the HP M-1008B (Hewlett Packard). For this purpose we simultaneously registered invasive arterial pulsewave, cuff pressure and cuff pressure oscillations of 20 patients from our intensive care unit and stored them in the database of the simulator. The invasive reference blood pressure values were determined following the recommendations given by the Association for the Advancement of Medical Instrumentation. The invasive system showed a cut-off frequency of 35 Hz; the damping constant was 0.21. With 49 record signals from patients we carried out 15 simulated measurements each. From a total of 49 bio-signals from patients the Dinamap 1846 was able to process 41 signals and the HP M-1008B 47 signals. The mean error of the oscillometric blood pressure measurement of the systolic, diastolic and mean arterial pressure amounted to −2.50 mmHg, 3.35 mmHg (P〈0.05) and 1.51 mmHg with the Dinamap 1846 and to −8.5 mmHg (P〈0.001), −5.15 mmHg (P〈0.001) and −5.58 mmHg (P〈0.001) for the HP M-1008B. The 95% confidence limit for the systolic, diastolic and the mean arterial pressure amounts to 56 mmHg, 30 mmHg and 35 mmHg for the Dinamap 1846 and 50 mmHg, 38 mmHg and 35 mmHg for the HP M-1008B. The differences between that two instruments could be caused by the different algorithms for the calculation of blood pressure values and different artefact detection and elimination techniques. The results of the performance tests we achieved with the PTB simulator correspond to the results of other clinical examinations. The American Association for the Advanecement of Medical Instrumentation recommends a maximum mean error of 5±8 mmHg. None of the examined instruments lay within these limits. Due to the systematic and stochastic errors, we think that the Dinamap 1846 (Critikon) and the HP M-1008B (Hewlett Packard) do not achieve performance levels that are adequate for measuring critically ill patients.
    Notes: Zusammenfassung Mit Hilfe eines Simulators, der reale Biosignale von Patienten verwendet, wurde die Meßgenauigkeit der Geräte Dinamap 1846 (Critikon) und HP M-1008B (Hewlett Packard) untersucht. Es wurden 49 artefaktfreie oszillometrische Signale von 20 Intensiv-Patienten für die Simulationsmessungen benutzt. Das Dinamap 1846 konnte nur 41 Signale von Patienten auswerten, das HP M-1008B 47 Signale. Bei dem Vergleich mit der invasiven Blutdruckmessung betrug der mittlere Meßfehler für den systolischen, diastolischen und mittleren arteriellen Blutdruck für das Dinamap 1846 2,50 mm Hg, 3,35 mm Hg (p〈0,05) und 1,51 mm Hg, sowie für das HP M-1008B −8,51 mm Hg (p〈0,001), 5,15 mm Hg (p〈0,001) und −5,58 mm Hg (p〈0,001). Das 95%-Toleranzintervall für den systolischen, diastolischen und mittleren arteriellen Blutdruck betrug 56 mm Hg, 30 mm Hg und 35 mm Hg für das Dinamap sowie 50 mm Hg, 38 mm Hg und 35 mm Hg für das HP M-1008B. Die unterschiedlichen Meßergebnisse sind vermutlich auf verschiedene Algorithmen zur Bestimmung der Blutdruckwerte und verschiedene Artefakterkennungsprogramme der Geräte zurückzuführen. Wegen der systematischen und stochastischen Abweichungen sind wir der Auffassung, daß das Dinamap 1846 und das HP M-1008B noch nicht den technischen Stand erreicht haben, um auch bei kritisch Kranken eingesetzt zur werden.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Anaesthesist 43 (1994), S. 441-446 
    ISSN: 1432-055X
    Keywords: Schlüsselwörter: Nichtinvasive Blutdruckmessung – Oszillometrie – Neonaten – Simulator – Geräteprüfung ; Key words: Blood pressure measurement – Oscillometric method – Neonates – Simulator – Performance test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract. Non-invasive blood pressure measurements by the auscultatory method do not provide reliable, reproducible blood pressure values in many neonates because the Korottkoff sounds are often very difficult to detect. This resulted in the development of many alternative indirect methods. Devices utilizing the Doppler ultrasound technique have not found wide acceptance. Since the introduction of automated oscillometric blood pressure monitors, arterial blood pressure has been increasingly brought into discussion as an indicator of the circulatory state. This is the first study to investigate the similarity and reproducibility of the data obtained with five oscillometric devices for measurement of blood pressure in neonates. Materials and methods. Since investigations on the technical performance are not practical in the clinical setting of a neonatal or pediatric ward, we used two simulators, the CuffLink (Dynatech, Nevada, USA) and a device developed by the PTB (Physikalisch-Technische Bundesanstalt). While the latter uses oscillations originally obtained from neonates, the CuffLink uses artificial and therefore ideal signals for the blood pressure monitors. The signals used for the PTB simulator were obtained from three neonates with an average age of 2 months and a weight of 3.5 kg, 4.4 kg, and 7.8 kg. The following blood pressure monitors were studied: Hoyer/Colin, BP-1001; Datex, Cardiocap II; SpaceLabs, model no. 90426; Hewlett-Packard, NBP M1008A; Critikon, Dinamap 1846. Before the measurements were started, the cuff pressure display of each monitor was checked according to a verification procedure. Although the 4 mm Hg margin of error was not exceeded, the results were corrected. Results. The results of the measurements show significant differences between the blood pressure monitors from the various manufacturers, with the differences for the ideal signals of the CuffLink-Simulator being less pronounced than those for the PTB simulator. Direct comparison of results is therefore often impossible. The standard deviation, taken from 20 measurements per monitor and simulation, is below 4 mm Hg for both simulators. We can therefore conclude that the reproducibility of data is satisfactory and the emerging trend is reliable. Discussion. The difference between the results of the PTB simulator and the CuffLink are probably due to the method of evaluation and the identification of artifacts of each blood pressure monitor. This is also confirmed by the studies of Mieke et al. The manufacturers should provide devices that display comparative results and improve the algorithms for detection of artefacts, increasing the accuracy of their blood pressure monitors. This could be done with the help of simulators. Considering the pathophysiological characteristics of neonates and infants, the systematic differences between the five monitors have to be regarded as serious.
    Notes: Zusammenfassung. Mit Hilfe zweier Simulatoren wurde das Meßverhalten von fünf automatischen Blutdruckmeßgeräten für Neugeborene (Hoyer/Colin, BP-1001; Datex, Cardiocap II; SpaceLabs, Modul 90426; Hewlett-Packard, NBP M1008A; Critikon, Dinamap 1846) auf Vergleichbarkeit und Reproduzierbarkeit der Ergebnisse untersucht. Die an den Simulatoren durchgeführten Messungen zeigen deutliche Unterschiede zwischen den Geräten verschiedener Hersteller. Da die Standardabweichung, ermittelt aus jeweils 20 Wiederholungsmessungen meist unter 4 mm Hg liegt, kann bei diesen Geräten von einer guten bis befriedigenden Reproduzierbarkeit der Messungen gesprochen und der Trend somit relativ sicher ermittelt werden. Angesichts der pathophysiologischen Besonderheiten beim Neugeborenen sind die systematischen Unterschiede zwischen den einzelnen Geräten als gravierend einzustufen. Die Industrie wird aufgefordert, die Vergleichbarkeit der Geräte verschiedener Hersteller zu erreichen.
    Type of Medium: Electronic Resource
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