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  • Embolisation  (3)
  • PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions  (2)
  • Risk factors  (2)
Materialart
Erscheinungszeitraum
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    HNO 47 (1999), S. 816-820 
    ISSN: 1433-0458
    Schlagwort(e): Schlüsselwörter Glomus jugulare ; Bilateral ; Embolisation ; Key words Bilateral glomus jugulare tumors ; Paragangliomas ; Tumor embolization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Bilateral glomus jugulare tumors are rare. However, their treatment should preserve not only the function of the facial nerve but also the caudal cranial nerves and the middle ears in order to avoid bilateral hearing losses. Further, venous cerebral drainage has to be ensured in order to avoid cerebral hypertension and hemorrhagic infarction after bilateral jugular ligations. In the case presented bilateral glomus jugulare tumors required super-selective angiography and embolization. Complete tumor removal on both sides was then possible by a transmastoid-transcervical approach without any further functional deteriorations. Middle ear function was preserved on both sides by temporary ventral translocation of the posterior wall of the auditory meatus. As the sigmoid sinus and internal jugular vein had been ligated during initial previous surgery, venous drainage was tested one year later by angiography and compression of the remaining internal jugular vein. A sufficient collateral circulation was found and permitted surgery on the second side.
    Notizen: Zusammenfassung Beidseitige Glomus-jugulare-Tumoren stellen eine Rarität dar. Neben der Funktion des N. facialis muß bei ihrer Entfernung auch die Funktion der kaudalen Hirnnerven berücksichtigt werden. Die Funktionserhaltung des Mittelohrs ist ebenfalls anzustreben, um einen beidseitigen Schalleitungsblock zu vermeiden. Die venöse zerebrale Drainage muß gesichert werden, da eine beidseitige Ligatur des Sinus sigmoideus zur zerebralen venösen Hypertension führen würde. Am Beispiel eines großen bilateralen Glomus-jugulare-Tumors der Klasse C2 ermöglichte die superselektive Angiographie und Embolisation die beidseitige vollständige Tumorentfernung ohne Funktionseinschränkungen über einen transmastoidalen-transzervikalen Zugang. Durch temporäre Ventralverlagerung der hinteren Gehörgangswand gelang auch die Erhaltung der Mittelohrfunktion. Wegen der Ligatur der V. jugularis interna und des Sinus sigmoideus auf der 1. Seite konnte die 2. Seite erst 1 Jahr später operiert werden, nachdem die Angiographie und Kompression der verbliebenen V. jugularis interna ausreichende venöse Kollateralen bestätigt hatte.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Intensive care medicine 22 (1996), S. 1155-1161 
    ISSN: 1432-1238
    Schlagwort(e): Nosocomial pneumonia ; scoring system ; Risk factors ; Intensive care units
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Objective To develop a scoring system for stratifying patients in intensive care units (ICUs) by risk of developing nosocomial pneumonia (NP), based on variables generally available in an ICU, and to determine the probability of a patient developing NP in the ICU. Design and setting A 2-year prospective cohort study conducted in a medical and surgical ICU. Patients 756 patients admitted to the ICU for 48 h or more were followed up until the development of NP or death or discharge from the ICU. Measurements and results 129 (17.1%) patients developed NP, 106 (14%) in the first 2 weeks. The following independent risk factors were identified by multivariate analysis: no infection on admission [relative risk (RR)=3.1, 95% confidence intervals (CI)=2.0 to 4.8]; thorax drainage (RR=2.1, 95% CI=1.2 to 3.5); administration of antacids (RR=2.1, 95% CI=1.4 to 3.1); partial pressure of oxygen (PO2)〉110 mmHg (RR=1.6, 95% CI=1.0 to 2.6); administration of coagulation factors (RR=1.8, 95% CI=1.0 to 3.2); male gender (RR=2.7, 95% CI=1.2 to 6.3); urgent surgery (RR=2.4, 95% CI=0.9 to 6.4); and neurological diseases (RR=4.2, 95% CI=1.9 to 9.4). To obtain a predictive risk index for NP, a scoring system was developed using a multivariate model. The probability of developing NP varied between 11.0% in the lowest risk group and 42.3% in the highest risk group. The patients' risk of acquiring NP was seven times higher in the highest score category (IV) than in the lowest one (I). Conclusions ICU patients can be stratified into high- and low-risk groups for NP. No infection on admission, thorax drainage, administration of antacids, and PO2〉110 mmHg were associated with a higher risk of NP during the entire 2-week period.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Intensive care medicine 22 (1996), S. 1155-1161 
    ISSN: 1432-1238
    Schlagwort(e): Key words Nosocomial pneumonia ; Scoring system ; Risk factors ; Intensive care units
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Objective: To develop a scoring system for stratifying patients in intensive care units (ICUs) by risk of developing nosocomial pneumonia (NP), based on variables generally available in an ICU, and to determine the probability of a patient developing NP in the ICU. Design and setting: A 2-year prospective cohort study conducted in a medical and surgical ICU. Patients: 756 patients admitted to the ICU for 48 h or more were followed up until the development of NP or death or discharge from the ICU. Measurements and results: 129 (17.1%) patients developed NP, 106 (14%) in the first 2 weeks. The following independent risk factors were identified by multivariate analysis: no infection on admission [relative risk (RR)=3.1, 95% confidence intervals (CI)=2.0 to 4.8]; thorax drainage (RR=2.1, 95% CI=1.2 to 3.5); administration of antacids (RR=2.1, 95% CI=1.4 to 3.1); partial pressure of oxygen (PO2) 〉110 mmHg (RR=1.6, 95% CI=1.0 to 2.6); administration of coagulation factors (RR=1.8, 95% CI=1.0 to 3.2); male gender (RR=2.7, 95% CI=1.2 to 6.3); urgent surgery (RR=2.4, 95% CI=0.9 to 6.4); and neurological diseases (RR=4.2, 95% CI=1.9 to 9.4). To obtain a predictive risk index for NP, a scoring system was developed using a multivariate model. The probability of developing NP varied between 11.0% in the lowest risk group and 42.3% in the highest risk group. The patients‘ risk of acquiring NP was seven times higher in the highest score category (IV) than in the lowest one (I). Conclusions: ICU patients can be stratified into high- and low-risk groups for NP. No infection on admission, thorax drainage, administration of antacids, and PO2〉110 mmHg were associated with a higher risk of NP during the entire 2-week period.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Neuroradiology 42 (2000), S. 104-107 
    ISSN: 1432-1920
    Schlagwort(e): Key words Magnetic resonance angiography, time resolved ; Malformations, vascular ; Embolisation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We report preliminary results of imaging intracranial vascular malformations with time-resolved projection MRA after a bolus injection of contrast median before and after endovascular treatment. Projection angiograms are acquired with a slice-selective snapshot FLASH sequence with a time resolution of two images per second, 40–60 images being acquired consecutively after bolus injection of 15 ml Gd-DTPA. Postprocessing of images in 2D projection MRA by correlation analysis offers several advantages with significant improvement of signal-to-noise, leading to adequate anatomical resolution. Subsecond projection MRA is a reliable technique for imaging intracranial vessels and gives information about the haemodynamics of vascular malformations.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    European archives of psychiatry and clinical neuroscience 227 (1979), S. 241-260 
    ISSN: 1433-8491
    Schlagwort(e): Meningiomas ; Superselective angiography ; Tumor embolization ; Localization ; Vascularization ; Meningeome ; Superselektive Angiographie ; Embolisation ; Tumorlokalisation ; Tumorvascularisation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Bei 21 Patienten mit Meningeomen verschiedener Lokalisation und Größe werden unterschiedliche Embolisationstechniken und die Ergebnisse von insgesamt 25 präoperativen Tumorembolisationen beschrieben. Transfemorale Katheterisierungsmethoden waren dabei wegen der besseren Manipulierbarkeit der Katheter, der erzielbaren angiographischen Superselektivität und entsprechend exakteren Plazierung der Emboli direkten Techniken mit Punktion der Carotiden überlegen. Die Embolisationsresultate zeigten eine deutliche Abhängigkeit von der Meningeomlokalisation, wobei sich Konvexitätsmeningeome (6 Patienten) als besonders geeignet für eine vollständige Embolisation erwiesen. Bei Meningeomen der Falx mit größerer parasagittaler Ausdehnung, des lateralen Keilbeinflügels, der Sylvischen Fissur und des Cavum Meckeli (9 Patienten) waren operativ wie histologisch noch gute Embolisationseffekte nachweisbar. Dagegen waren Embolisationen bei ausschließlicher Tumorlokalisation an der Falx oder dem Tentorium sowie bei überwiegend internaversorgten Keilbeinflügelmeningeomen ohne therapeutischen Effekt. Bei Berücksichtigung der Tumorlokalisation und des Vascularisations-types sowie der Anwendung geeigneter superselektiver Angiographie- und Embolisationstechniken wird die präoperative Meningeomembolisation als wichtige Verbesserung der operativen Ausgangsbedingungen angesehen.
    Notizen: Summary The different techniques and results are described for a total of 25 preoperative tumor embolizations in 21 patients with meningiomas of diverse localizations and extents. Transfemoral catheter techniques were superior to direct punctures of the carotid arteries because of the easier handling of the catheters, the better superselectivity of angiography, and, consequently, the more exact placement of the emboli. The results of the embolizations depended on the localization of the meningiomas. Meningiomas of the convexities (six patients) turned out to be particularly susceptible to complete embolizations. Satisfactory results were achieved operatively and histologically through embolization in meningiomas of the falx with large parasagittal expansion as well as in those of the lateral sphenoid wing, the sylvian fissure, and the cavum Meckeli (nine patients). Embolization of tumors which were localized exclusively at the falx, the tentorium, or of more medially situated meningiomas of the sphenoid wing were without beneficial effect, since these are predominantly vascularized by branches of the internal carotid arteries. Provided the localization and vascularization of a tumor are favourable, the application of superselective angiography and preoperative embolization represents an important improvement of the basic conditions for a later operation.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    ISSN: 1434-601X
    Schlagwort(e): PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The photoproduction of two neutral pions from the deuteron has been studied for incident photon energies from 200 MeV to 820 MeV with the TAPS spectrometer at MAMI (Mainz Microtron). The total cross-section was determined and used to deduce the cross-section from the neutron. Due to the good statistical quality of the data Dalitz plots for the three particles in the exit channel (π0π0 N) could be constructed. The invariant mass distributions derived from them are presented in this paper. They indicate that the important reaction mechanism in the second resonance region is a sequential decay pattern involving the population of the Δ(1232)-resonance as an intermediate state.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    ISSN: 1434-601X
    Schlagwort(e): PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass analysis. From threshold up to 370 MeV the total cross-section does not exceed 30 nb. For higher energies it shows a smooth rise until it reaches a maximum of about 10 μb at E γ = 740 MeV. Dalitz plots of m 2(π0π0) versus m 2(p,π0) for seven bins of incident photon energy have been analysed. For E γ 〉 610 MeV, a strong contribution of a sequential decay is observed with the Δ(1232)-resonance as intermediate state. A comparison to model calculations shows that these sequential decays presumably originate from the D 13(1520) and also the P 11(1440)-resonance.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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