Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1432-2013
    Keywords: Ciliary muscle ; Cell culture ; Intracellular calcium ; Isolated ciliary muscle strips ; Contractility ; Acetylcholine ; Carbachol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Electromechanical and pharmacomechanical coupling was investigated in human ciliary muscle by measuring the intracellular free calcium in single cultured ciliary muscle cells and the contractility in meridional ciliary muscle strips. The basal resting calcium concentration was 75±8.7 nmol/l, n=23. Application of acetylcholine (0.1 mmol/l) and carbachol (0.1 mmol/l) resulted in an initial [Ca2+]i peak followed by a recovery phase and a [Ca2+]i plateau. The initial [Ca2+]i peak was still observed in the absence of extracellular calcium and in the presence of verapamil (0.1 mmol/l). During its plateau [Ca2+]i was decreased by withdrawal of extracellular calcium or application of verapamil (0.1 mmol/l). Depolarization induced by a high level of extracellular potassium yielded only a small transient [Ca2+]i peak without a [Ca2+]i plateau. In isolated ciliary muscle strips, muscarinic stimulation (carbachol 0.1 mmol/l) resulted in an initial phasic and a subsequent tonic contraction. Removal of external calcium reduced the phasic contraction to 30.6±4.4% (n=8) and completely abolished the tonic one. Verapamil (0.1 mmol/l) had only a slight relaxing effect when applied during the tonic contraction. We conclude that human ciliary muscle contraction is mediated by calcium release from intracellular stores and calcium entry through calcium channels, which are most probably receptor-operated. Depolarization of the muscle cell membrane and calcium entry through voltage-operated calcium channels do not contribute significantly to human ciliary muscle contraction.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Intensivmedizin und Notfallmedizin 37 (2000), S. 213-219 
    ISSN: 1435-1420
    Keywords: Key words Perimyocarditis – Still's Disease – Adult onset ; Schlüsselwörter Perimyokarditis – Still-Syndrom des Erwachsenen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das Still-Syndrom des Erwachsenen ist gekennzeichnet durch Fieber, Arthralgien, Exantheme und Leukozytose mit Linksverschiebung als Hauptsymptome sowie Rachenentzündung, Lymphadenopathie und/oder Splenomegalie, Leberdysfunktion sowie negativem Rheumafaktor und negativen antinukleären Antikörpern als untergeordnete Symptome. Wir beschreiben einen Fall, der sich klinisch zunächst als Racheninfektion präsentierte, im weiteren Verlauf mußte auf Grund entsprechender EKG-Veränderungen differentialdiagnostisch eine Perimyokarditis berücksichtigt werden, die auch durch eine Herzmuskelbiopsie nicht ausgeschlossen werden konnte. Wegen hoher Temperaturen und Leukozytose mit Linksverschiebung wurde initial unter dem Verdacht auf einen schweren bakteriellen Infekt mit verschiedenen Antibiotikaregimen letztlich erfolglos behandelt. Erst im weiteren klinischen Verlauf kamen Symptome wie Leberenzymerhöhungen und Arthralgien hinzu, die die Diagnose eines Still-Syndroms wahrscheinlich machten. Nach Beginn einer hochdosierten Kortikoidtherapie kam es zu einer dramatischen Besserung des klinischen Bildes und zu einer Normalisierung der Temperaturen. Der Patient ist unter einer Kortikoid-Erhaltungstherapie nun seit mehreren Monaten anhaltend beschwerdefrei.
    Notes: Summary Late onset of adult Still's Disease is characterized by fever, arthralgia, typical rash and leukocytosis as major criteria, and sore throat, lymphadenopathy and/or splenomegaly, liver dysfunction and the absence of rheumatoid factor and antinuclear antibody as minor criteria. A 20 year old man presented with tonsillitis followed by perimyocarditis, which was borderline by myocardial biopsy, typical ECG changes with negative T-waves in the left precordial leads and a slightly reduced left ventricular function echocardiographically. Because of high temperature and neutrophilia he was initially treated for bacterial infection with different regimens of antibiotics. In the clinical follow up he developed other symptoms like elevation of liver enzymes and arthralgia. These symptoms together with persistent fever, elevated leukocytes and a severe inflammatory process despite antibiotic therapy and negative rheumatoid factor as well as negative antinuclear factors led to the diagnosis of Still's Disease after exclusion of a hematological disease by bone marrow examination. After starting high dose corticoid therapy, the fever decreased promptly and patient feels well since then. This case shows that in patients initially presenting with perimyocarditis after upper respiratory tract infection, the very rare differential diagnosis of late onset of Still's Disease has to be contemplated.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...