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  • 1
    Electronic Resource
    Electronic Resource
    Klinische Anwendung der TCCD zum Nachweis intrakranieller Aneurysmen (1998)
    Springer
    Der Nervenarzt 69 (1998), S. 671-677 
    Details
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Aneurysma ; Transkranielle Duplexsonographie ; Embolisation ; Subarachnoidalblutung ; Key words Aneurysm ; Transcranial Duplex sonography ; Coil embolization ; Subarachnoid hemorrhage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary We investigated 88 Patients with a total of 102 angiographically diagnosed intracranial aneurysms by means of transcranial colour coded Duplex sonography (TCCD) during a time period of 15 months. Both the size and teh localization of teh aneuryms were determined. Seventy aneurysms (77%) with a diameter of 16±8 mm (6-55mm) were detectable, with excellent visualization in 36 (42%), moderate visualization in 34 (40%), and no sufficient visualization in 16 (16%) aneurysms, respectively. In another 16 cases (16%) there was no sufficient vone window. Thrombotic material inside the aneurysm was detectable in 16/20 cases (75%), visualization of coil embolized aneurysms in 12/25 patients (48%). TCCD allows the follow up of cerebral aneurysms, with the detection of thrombosis and treatment effects after embolization. The method is not valid for the detection of intracranial aneurysms
    Notes: Zusammenfassung Innerhalb eines Zeitraumes von 15 Monaten wurden 88 Patienten mit 102 angiographisch nachgewiesenen intrakraniellen Aneurysmen unter Verwendung einer 2-MHz-Sonde mit der transkraniellen farbkodierten Duplexsonographie (TCCD) untersucht. Es wurden die Größe und der genaue Aneurysmasitz bestimmmt. Insgesamt konnten 70 (77%) Aneurysmen mit einem Durchmesser von 16±8 mm (6–55 mm) dargestellt werden. Eine sehr gute Darstellung der Aneurysmen gelang bei 36 (42%), eine mäßige bei 34 (40%) Aneurysmen, 16 (16%) Aneurysmen konnten trotz ausreichender Bildqualität nicht dargestellt werden. Bei weiteren 16 (16%) Aneurysmen war kein ausreichendes Knochenfenster vorhanden. Thrombosierte Anteile innerhalb der Aneurysmen konnten bei 16 (75%) von 20, der mit Coils behandelte Anteil bei 12 (48%) von 25 Aneurysmen erfolgreich dokumentiert werden. Die Methode ist zum Nachweis von teilthrombosierten Anteilen, von Behandlungserfolgen nach Coilembolisation und zur Verlaufskontrolle nicht behandelbarer Aneurysmen geeignet. Die Darstellbarkeit kleiner Aneurysmen ist begrenzt durch das Auflösungsvermögen und die teilweise ungünstigen Beschallungswinkel, somit eignet sich die TCCD nicht als Screeningmethode zum Nachweis von Aneurysmen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001150050327
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  • 2
    Electronic Resource
    Electronic Resource
    Visualisation of intracranial aneurysms by transcranial duplex sonography (1996)
    Springer
    Neuroradiology 38 (1996), S. 555-559 
    Details
    ISSN: 1432-1920
    Keywords: Key words Aneurysm ; Transcranial colour-coded duplex sonography ; Embolisation ; Subarachnoid haemorrhage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We examined 72 patients with 89 angiographically confirmed intracranial aneurysms, using transcranial colour-coded duplex sonography (TCCD) to determine the location and size of the aneurysm. The patients were admitted for coil embolisation of their aneurysm following subarachnoid haemorrhage or because of a cranial nerve palsy. Using a 2/2.25 MHz transducer, 42 aneurysms (47 %) were seen satisfactorily through the temporal bone window or foramen magnum. In 24 cases (27 %) image quality was insufficient as a result of a poor bone window, of the aneurysm having a diameter of less than 6 mm or of its being in an unfavourable location. In 23 other cases (26 %) it was not possible to detect the aneurysm. Thrombosed structures could be demonstrated using TCCD in 8 of 12 giant intracavernous or basilar artery aneurysms, and in 15 of 19 aneurysms treated by platinum coil embolisation. TCCD offers a noninvasive method for monitoring progressive intra-aneurysmal thrombosis following coil embolisation and for follow-up of patients with untreatable fusiform aneurysms, should this be required. Detection of small aneurysms is limited by spatial resolution and insonation angles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626097
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  • 3
    Electronic Resource
    Electronic Resource
    Sympathetic cardiovascular dysfunction in long-standing idiopathic Parkinson's disease (1997)
    Springer
    Clinical autonomic research 7 (1997), S. 311-314 
    Details
    ISSN: 1619-1560
    Keywords: idiopathic Parkinson's disease ; sympathetic dysfunction ; autonomic evaluation ; spectral analysis ; baroreflex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Standard autonomic tests (heart rate response to deep breathing-HR db , heart rate and systolic blood pressure response to tilt-ΔHR and ΔSBP) and spectral analysis of heart rate and arterial blood pressure and their transfer function (for the mid-frequency band a measure of baroreflex sensitivity) were performed in 20 patients with idiopathic Parkinson's disease (IPD) and 20 age-matched controls. Patients showed significantly diminished ΔSBP, and reduced sympathetic vasomotor and cardiomotor outflow (diminished Mayer waves), consistent with an alteration of the efferent arc of the baroreflex. These results were only significant in long-standing IPD (IPD-1, 〉5 years), whereas patients with short disease duration (IPD-s, 〈5 years) showed values comparable to controls. Respiratory-related heart rate variability was slightly reduced in IPD-1 but this was mainly due to diminished respiratory effort, indicated by low respiratoryrelated blood pressure variability. We conclude that autonomic abnormalities are only present in long-standing IPD and consist in reduced sympathetic vasomotor and cardiomotor outflow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267723
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  • 4
    Electronic Resource
    Electronic Resource
    Determinants of heart rate variability during deep breathing: Basic findings and clinical applications (1997)
    Springer
    Clinical autonomic research 7 (1997), S. 131-135 
    Details
    ISSN: 1619-1560
    Keywords: heart rate variability ; blood pressure waves ; deep breathing ; spectral analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The measurement of heart rate variation during forced breathing (HRDB) is a well-known clinical test of parasympathetic function. It is known that normal values of HRDB are strongly dependent on age. However, little is known about other physiological factors that may lead to reduced HRDB values that may mimic parasympathetic failure. Thirty-two normal subjects (age 56.7±12.4 years) and 32 neurological patients with pathological autonomic test findings (age 57.9±10.2) were studied. Oscillations in heart rate and in mean arterial blood pressure were recorded in the supine position during forced breathing (6 cycles/min) using the Finapres monitor. Amplitudes of heart rate and blood pressure waves at 6 cycles/min (HR6 and ABP6) as well as gain values (Gain6=HR6/ABP6) and phase differences ({ie131-1}) between HR and ABP waves were calculated by means of spectral analysis. The mean (±SD) HR6 in normal subjects was 6.34±3.36 cycles/min with a mean ABP6 of 5.11±2.49 mmHg. HR6 correlated significantly with age (r=−0.426) and with ABP6 (r=0.602). No significant correlation was found between HR6 and mean blood pressure, mean heart rate or sex. From 24 patients with pathological findings in the classical HRDB value, only nine could be classified as pathological when the effect of ABP6 was considered. In conclusion, ABP variations significantly influence the amplitude of heart rate variations during forced breathing. We interpret these findings in terms of a baroreflex mechanism of HRDB including both vagal and sympathetic efferents. Normal reference value tables for clinical HRDB studies should not only consider age but also the amplitude of blood pressure variations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02308840
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    Paper (German National Licenses)
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