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  • Aktionspotential  (1)
  • Potassium  (1)
  • Rejection  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 335 (1972), S. 266-278 
    ISSN: 1432-2013
    Keywords: Anoxia ; Atria ; Papillary Muscle ; Potassium ; ATP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The action potential duration (APD) of guinea pig atrial muscle responded qualitatively to metabolic depression and altered glucose concentration as shown previously for papillary muscle. Both preparations lost potassium and gained sodium during 8 h anoxic incubations and these changes were partially prevented by 50 mM glucose. Experiments with potassium42 indicated that anoxia-induced loss of potassium was not primarily due to an increased efflux but to a decreased influx. Stimulation did not increase potassium42 efflux from atria but caused some increase in potassium loss. The ATP content of atria and ventricular muscle decreased rapidly during anoxic incubation but was maintained at a significantly higher level in the presence of 50 mM glucose. Since muscle potassium levels following 8 h of anoxic incubation were incompatible with observed resting potentials, the results support the concept of either an electrogenic sodium pump or the intracellular compartmentalization of potassium. In addition, the anoxia-induced reduction of action potential duration does not appear to be associated with an increase in potassium42 efflux.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2013
    Keywords: Cardiac Muscle ; Anoxia ; 2,4-Dinitrophenol ; Adenosine Triphosphate ; Action Potential ; Herzmuskel ; Anoxie ; 2,4-Dinitrophenol ; Adenosintriphosphat ; Aktionspotential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The sensitivity of guinea-pig papillary muscle transmembrane electrical activity to alterations in medium glucose concentration increased with time of incubation under anoxic conditions. DNP at a concentration of 10−4 M produced a decrease in fresh papillary muscle action potential duration comparable to that produced by low medium glucose in muscle after prolonged anoxic incubation. 10−6 M DNP did not increase the decline in action potential duration of fresh papillary muscle caused by anoxic incubation in medium containing 5 mM glucose. The ATP content of ventricular strips fell to about 30% control during 60 min of anoxia but was maintained at a significantly higher level when the medium contained 50 mM rather than 5 mM glucose. In the presence of 10−4 M DNP the ATP content of strips fell to 25% control in 10 min and the increased loss was maintained throughout 60 min. During 120 min incubation in medium containing 5 mM glucose and oxygen, the ATP of strips was maintained but the action potential duration declined to 50% control. The results support the proposal that a close association exists between glycolytically produced ATP and transmembrane electrical activity. The effects of DNP on transmembrane electrical activity may be explained by an active depletion of ATP in addition to its uncoupling activity.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2277
    Keywords: Key words Neoral ; Sandimmune ; Cyclosporine ; Liver transplantation ; Rejection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We compared results using Neoral versus Sandimmune, each in combination with steroid and azathioprine immunosuppression, in primary liver transplantation recipients. There were 15 patients in each group with similar demographic distributions. Intravenous cyclosporine was stopped at 4.3 ± 1.9 days in the Neoral group vs 7.8 ± 4.9 days in the Sandimmune group (P 〈 0.025). Cyclosporine levels in the first 10 days were higher (mean 306 ng/ml vs 231 ng/ml) in the Neoral group than the Sandimmune group (P 〈 0.05). The Neoral dose was less than the Sandimmune dose (mean 5.5 ng/kg per day vs 7.9 ng/kg per day) to achieve these levels in that time period (P 〈 0.05). Two patients (13 %) experienced three episodes of biopsy-proven rejection in the Neoral group compared to nine patients (60 %) with 12 episodes of rejection in the Sandimmune group (P 〈 0.025). Incidences of neurological and renal complications were similar between the groups. Infections requiring treatment were also similar. Liver function, renal function, and marrow function, evaluated at days 7, 14, 21, 28, and 2, 4, 6, and 12 months post-transplant, were not different between the groups. In summary, shorter use of intravenous cyclosporine and quicker stabilization of trough cyclosporine levels was achieved with Neoral than with Sandimmune. In the early posttransplant period, higher levels with lower doses were achieved with Neoral than with Sandimmune. In our experience, the incidence of rejection was lower with Neoral than with Sandimmune. There were similar lengths of hospitalization, mortality, adverse events, retransplantation, and similar liver, renal, and marrow function up to 1 year posttransplantation. Because of this experience, we continued to use Neoral in a total of 59 primary liver transplant recipients. We have not used intravenous cyclosporine in the last 44 patients. Follow-up was a mean of 11.4 months, ranging from 1 to 27 months. The incidence of rejection was 24 % in these 59 patients compared to our historical experience of 70 % using Sandimmune.
    Type of Medium: Electronic Resource
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