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  • Artikel: DFG Deutsche Nationallizenzen  (4)
  • 1995-1999  (4)
  • hypergeometric function  (2)
  • Coronary heart disease  (1)
  • Key words Monodomain  (1)
Datenquelle
  • Artikel: DFG Deutsche Nationallizenzen  (4)
Materialart
Erscheinungszeitraum
  • 1995-1999  (4)
Jahr
  • 1
    ISSN: 1432-055X
    Schlagwort(e): Schlüsselwörter Kontinuierliche Spinalanästhesie ; Sectio caesarea ; Schwangerschaft ; koronare Herzkrankheit ; Risikopatientin ; Key words Continuous spinal anaesthesia ; Caesarean section ; Pregnancy ; Coronary heart disease ; High Risk Patient
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract As a consequence of the progress in (perinatal) medicine the number of pregnant women with severe cardiopulmonal risk, who need caesarean delivery, is rising. The anaesthetic care of these patients requires optimal preparation and – as a prerequisite – constant intraoperative vitalfunctions (heartrate, bloodpressure, oxygensaturation). Typical risks like airway-problems, hypoxia, hyper- and hypotension and tachycardia must be strictly avoided. We report a case of successful caesarean delivery in a patient with severe coronary heart disease, using spinal catheter technique. Case report: The patient was a 36-year-old woman with a symptomatic coronary heart disease. Risk factors were hypercholesterinaemia, obesity (105 kg/168 cm), COPD consecutive to excessive nicotineabuse and hypertonia. Emergency admissions in the 12th and 14th gestation week led to the necessity of PTCA in the 15th and 19th gestation week in spite of pregnancy: coronary stenoses of 90% and 70% were dilated. Caesarean section was scheduled for 38 weeks’ gestation, however due to the high risk involved we decided to use a continuous spinal technique. There were no problems with introducing the catheter (28 gauge, L 3–4 interspace). Under careful titration a total of 2.2 ml plain bupivacaine 0.5% (spinal catheter) and 0.5 mg alfentanil (intravenously) were administered. This produced anaesthesia up to T 8 without any respiratory or cardiovascular embarrassment. A healthy male infant (Apgar score 9/10/10) was delivered. Postoperative analgesia was provided by intrathecal injections of bupivacaine and intravenous injections of piritramide. There were no intraoperative or postoperative problems. Discussion: By means of continuous spinal anaesthesia for caesarean section it is possible to avoid typical complications of general anaesthesia (hypoxia, airway management, aspiration, tachycardia), of single-shot spinal anaesthesia (hypotension, low or high block) and of epidural anaesthesia (high dose of local anaesthetics, danger of accidental intrathecal or intravenous injection). The possibility of postoperative analgesia is advantageous. Technical difficulties, postspinal headache and the high costs of the sets may be disadvantageous. Conclusion: This case demonstrates, that the use of a continuous spinal catheter technique for caesarean section anaesthesia is an alternative method, which should be considered especially in high risk patients, when meticulous care for constant vital functions is requested urgently.
    Notizen: Zusammenfassung Wir berichten über die Schnittentbindung in der 38. Schwangerschaftswoche bei einer 36jährigen Hochrisikopatientin in Spinalkathetertechnik. Eine schwere symptomatische koronare Herzerkrankung (Risikofaktoren: Hypercholesterinämie Typ II, Adipositas, Hypertonie, Nikotinabusus mit chronischer Bronchitis) der Patientin erfordert ab der 12. SSW therapeutische Maßnahmen und zwingt zur PTCA in der 15. und 19. Schwangerschaftswoche. Die geplante Sectio caesarea wird in Spinalkathetertechnik unter titrierender Gabe von insgesamt 2,2 ml isobarem Bupivacain 0,5% ausgeführt und gelingt problemlos; Herzfrequenz und Blutdruck bleiben stabil, es treten keine Angina-pectoris-Beschwerden auf. Der postoperative Verlauf ist unauffällig. Der Fallbericht soll zeigen, daß die kontinuierliche Spinalanästhesie die Möglichkeit sowohl der Aufrechterhaltung sehr stabiler Vitalfunktionen als auch einer eleganten postoperativen Analgesie bietet. Sie kommt daher als alternative Anästhesiemethode gerade bei Patientinnen mit schwerwiegenden mütterlichen oder kindlichen Risiken in Betracht, da mit dieser Methode spezifische Risiken anderer Anästhesieverfahren vermieden werden können. Diskutiert werden Vor- und Nachteile des Verfahrens.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Rheologica acta 36 (1997), S. 330-344 
    ISSN: 1435-1528
    Schlagwort(e): Relaxation time spectrum ; monodisperse polymers ; hypergeometric function ; incomplete gamma function ; linear viscoelasticity ; polymer dynamics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract The linear viscoelastic material functions of linear flexible polymers of uniform length are calculated from the BSW spectrum (Baumgaertel et al., 1990, 1992), and explicit analytic expressions are presented for several of the most common material functions for transient and dynamic experiments. However, numerical calculations are presented whenever needed. The BSW spectrum was determined from experimental G″, G″ data of two sets of molten polymers of narrow molecular weight distribution, polystyrene and polybutadiene. The purpose of the mapping is to show a wide range of viscoelastic behavior which otherwise is not available in such comprehensive form. Experimental check of these predictions is still needed in most cases. Also, some insight into the predictions for the non-linear (including the non-equilibrium) viscoelastic behavior is achieved by studying two particular experiments: the start-up of uniaxial extension at constant rate and the start-up of shear flow at constant rate.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Rheologica acta 36 (1997), S. 330-344 
    ISSN: 1435-1528
    Schlagwort(e): Key words Relaxation time ; spectrum ; monodisperse polymers ; hypergeometric function ; incomplete gamma function ; linear viscoelasticity ; polymer dynamics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract The linear viscoelastic material functions of linear flexible polymers of uniform length are calculated from the BSW spectrum (Baumgaertel et al., 1990, 1992), and explicit analytic expressions are presented for several of the most common material functions for transient and dynamic experiments. However, numerical calculations are presented whenever needed. The BSW spectrum was determined from experimental G′,G″′ data of two sets of molten polymers of narrow molecular weight distribution, polystyrene and polybutadiene. The purpose of the mapping is to show a wide range of viscoelastic behavior which otherwise is not available in such comprehensive form. Experimental check of these predictions is still needed in most cases. Also, some insight into the predictions for the non-linear (including the non-equilibrium) viscoelastic behavior is achieved by studying two particular experiments: the start-up of uniaxial extension at constant rate and the start-up of shear flow at constant rate.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1435-1528
    Schlagwort(e): Key words Monodomain ; Conoscopy ; Alignment angle ; Shear
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract Orientational changes in monodomains of flow-aligning liquid crystals, 4-n-pentyl-4′-cyanobiphenyl and N-(4-methoxybenzylidene)-4-butylaniline, were studied during shear and recovery in a linear shearing device fitted to an optical microscope. Planar alignment (director in the shear plane) allows the study of twist effects and was generated by strong planar anchoring at the walls with orientations in a range of 0–90° with the shear direction. While being held back by the anchoring walls, shear caused the bulk director to rotate towards a steady-state alignment angle in the shear direction (Leslie angle θL). The transient director rotation was observed with conoscopy. It was found that increasing the initial alignment towards the vorticity direction increased the measured θL. Upon stopping the flow, the bulk director returned to its initial state. With initial alignment orientation changing from parallel to perpendicular to the flow direction, the rate of the twist-driven recovery process increases. This rate increase is not seen in the splay-driven recovery which is constant and consistently faster than twist-driven recovery at all orientations studied.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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