The Silver Voltameter as an International Standard for the Measurement of Electric Current

1917 ◽  
Vol 83 (2154supp) ◽  
pp. 234-234
Author(s):  
E. B. Rosa ◽  
G. W. Vinal
Keyword(s):  
Electric Current ◽  
International Standard

Naloxon – Medizinische Grundlagen und internationale Erfahrungen

2019 ◽  
Vol 65 (5) ◽  
pp. 335-342
Author(s):  
Norbert Wodarz ◽  
Jörg Wolstein ◽  
Heike Wodarz-von Essen ◽  
Oliver Pogarell
Keyword(s):  
Randomized Controlled Trial ◽  
Glasgow Coma Scale ◽  
Controlled Trial ◽  
Cochrane Library ◽  
Coma Scale ◽  
International Standard ◽  
Trial Number ◽  
Randomized Controlled ◽  
Opioid Crisis ◽  
Lebensrettende Basismaßnahmen

Zusammenfassung. Hintergrund: Die Abhängigkeit von Opioiden ist mit erheblichen gesundheitlichen Gefährdungen der Betroffenen und einer hohen Mortalität assoziiert. Derzeit werden insbesondere die dramatisch gestiegenen Mortalitätsraten in den USA diskutiert (‚opioid crisis‘), aber auch in Deutschland war in den letzten Jahren ein kontinuierlicher Anstieg der Drogentoten, überwiegend verursacht durch Opioide, zu verzeichnen. Die Risiken einer Opioid Überdosierung bzw. Intoxikation resultiert vor allem aus der hemmenden Wirkung der Opioide auf den Atemantrieb, die durch andere gleichzeitig konsumierte Substanzen noch verstärkt werden kann. Neben Erstmaßnahmen (Notruf, lebensrettende Basismaßnahmen der Ersten Hilfe) kommt auch der Einsatz des Opioidantagonisten Naloxon in Betracht. Methode: Literaturrecherche in PubMed, Cochrane Library und im International Standard Randomized Controlled Trial Number (ISRCTN) Register. Ergebnisse: Auch aus ethischen Gründen liegen bislang eher wenig systematische Untersuchungen zum nicht-ärztlichen Einsatz von Naloxon bei Opioidüberdosierung vor. Trotzdem kann nach aktuellem Stand geschlussfolgert werden, dass die intranasale Verabreichung vergleichbar wirksam mit einer intramuskulären Anwendung zu sein scheint. Bei Überdosierten, die nach erfolgreichem Naloxon-Einsatz aus unterschiedlichen Gründen nicht in einer Klinik gebracht wurden, wurden in ca. 1 %. Todesfälle dokumentiert. Falls 60 min nach Naloxongabe unauffällige Vitalparameter und auf der Glasgow Coma Scale mind. 15 Punkte erreicht werden, besteht wohl ein sehr niedriges Rebound-Risiko. Im Vergleich dazu ist das Auftreten von Naloxon-induzierten Entzugssyndromen deutlich häufiger, hängen jedoch von der Dosis und dem konsumierten Opioid ab, wie auch von der verabreichten Naloxon-Dosis. Schlussfolgerungen: Naloxon kann mittlerweile auch in Deutschland als zugelassenes Nasalspray verabreicht werden und ist daher im Prinzip auch für den Einsatz durch Ersthelfer geeignet. Verbesserte Rahmenbedingungen, wie z. B. spezifische Schulungen könnten dazu beitragen, Take-Home Naloxon als erfolgreichen Baustein zur Reduktion von Drogentod zu implementieren.

A Collaborative Study to Establish the 2nd International Standard for Tissue Plasminogen Activator (t-PA)

1987 ◽  
Vol 58 (04) ◽  
pp. 1085-1087 ◽  
Author(s):  
P J Gaffney ◽  
A D Curtis
Keyword(s):  
Plasminogen Activator ◽  
Tissue Plasminogen Activator ◽  
Collaborative Study ◽  
Chinese Hamster ◽  
World Health ◽  
Clot Lysis ◽  
Expert Committee ◽  
Single Chain ◽  
International Standard ◽  
Tissue Plasminogen

SummaryAn international collaborative study involving ten laboratories located in eight different countries was undertaken in order to replace the current International Standard (I.S.) for tissue plasminogen activator (t-PA). Two lyophilised candidate preparations of high purity were assessed in comparison with the current I.S. for t-PA using only a clot lysis assay. One preparation (coded 861670) was purified from a cultured melanoma cell supernatant and was about 98% single chain t-PA while the other preparation (coded 861624) was derived from Chinese hamster ovary (CHO) cells following DNA recombinant procedures and was 75% single chain t-PA.Both candidate preparations of t-PA compared in quite a satisfactory manner with the current I.S. from the viewpoint of the biometrics of parallel line bioassays and both preparations were quite stable for long periods at low temperatures and stable from up to 1 month at temperatures of 20° and 38° C. Both fultil the criteria to serve as a satisfactory Znd International Standard for t-PA. The Fibrinolysis Subcommittee of the International Committee for Thrombosis and Haemostasis recommended the melanoma source t-PA (861670) as the next I.S. in order to maintain continuity with the 1st I.S. which was also a melanomatype preparation. The data from the ten laboratories indicated that each ampoule of the new proposed standard contains 850 international units of t-PA activity by the clot lysis assay. It is planned to present the results of this study to the Expert Committee on Biological Standardization of the World Health Organization at its next meeting and to request that the preparation of t-PA, coded 861670, be established as the 2ndlnternational Standard for t-PA.

A Collaborative Study to Establish the Second International Standard for Streptokinase

1990 ◽  
Vol 64 (02) ◽  
pp. 267-269 ◽  
Author(s):  
A B Heath ◽  
P J Gaffney
Keyword(s):  
High Purity ◽  
Collaborative Study ◽  
World Health Organisation ◽  
World Health ◽  
Clot Lysis ◽  
Current Standard ◽  
International Standard ◽  
Accelerated Degradation ◽  
The World ◽  
International Collaborative Study

SummaryAn International Standard for Streptokinase - Streptodomase (62/7) has been used to calibrate high purity clinical batches of SK since 1965. An international collaborative study, involving six laboratories, was undertaken to replace this standard with a high purity standard for SK. Two candidate preparations (88/826 and 88/824) were compared by a clot lysis assay with the current standard (62/7). Potencies of 671 i.u. and 461 i.u. were established for preparations A (88/826) and B (88/824), respectively.Either preparation appeared suitable to serve as a standard for SK. However, each ampoule of preparation A (88/826) contains a more appropriate amount of SK activity for potency testing, and is therefore preferred. Accelerated degradation tests indicate that preparation A (88/826) is very stable.The high purity streptokinase preparation, coded 88/826, has been established by the World Health Organisation as the 2nd International Standard for Streptokinase, with an assigned potency of 700 i.u. per ampoule.

A Collaborative Study to Establish an International Standard for Alpha-Thrombin

1992 ◽  
Vol 67 (04) ◽  
pp. 424-427 ◽  
Author(s):  
P J Gaffney ◽  
A B Heath ◽  
J W Fenton II
Keyword(s):  
Elevated Temperatures ◽  
Collaborative Study ◽  
World Health Organisation ◽  
Significant Loss ◽  
Thrombin Inhibitors ◽  
World Health ◽  
Expert Committee ◽  
International Standard ◽  
Assay Procedure ◽  
And Control

SummarySince 1975 an International Standard for Thrombin of low purity has been used. While this standard was stable and of value for calibrating thrombins of unknown potency the need for a pure a-thrombin standard arose both for accurate calibration and for precise measurement of thrombin inhibitors, notably hirudin. An international collaborative study was undertaken to establish the potency and stability of an ampouled pure a-thrombin preparation. A potency of 97.5 international units (95% confidence limits 86.5-98.5) was established for the new a-thrombin standard (89/ 588) using a clotting-assay procedure. Stability data at various elevated temperatures indicated that the standard could be transported and stored with no significant loss of potency.Ampoules of lyophilised a-thrombin (coded 89/588) have been recommended as an International Standard for a-thrombin with an assigned potency of 100 international units per ampoule by the International Society for Thrombosis and Haemostasis (Thrombin and its Inhibitors Sub-Committee) in Barcelona, Spain in July 1990 while the Expert Committee on Biological Standardisation and Control of the World Health Organisation will consider its status at its next meeting in Geneva in 1991.

A Collaborative Study of a Proposed International Standard for Tissue Plasminogen Activator (t-PA)

1985 ◽  
Vol 53 (01) ◽  
pp. 134-136 ◽  
Author(s):  
P J Gaffney ◽  
A D Curtis
Keyword(s):  
Plasminogen Activator ◽  
Tissue Plasminogen Activator ◽  
Collaborative Study ◽  
International Committee ◽  
World Health ◽  
Clot Lysis ◽  
Expert Committee ◽  
International Standard ◽  
Tissue Plasminogen ◽  
Health Organization

SummaryAn international collaborative study involving seven laboratories was undertaken to assess which of three lyophilised preparations might serve as an International Standard (I.S.) for tissue plasminogen activator (t-PA). Two of the preparations were isolates from human melanoma cell cultures while one was of pig heart origin. A clot lysis assay was used by all participants in the study.The data suggested that both preparations of human cell origin were comparable, in that their log dose-response lines were parallel, while that of the porcine preparation was not. Accelerated degradation studies indicated that one melanoma extract (denoted 83/517) was more stable than the other and it was decided to recommend preparation 83/517 as the standard for t-PA. The International Committee for Thrombosis and Haemostasis (Stockholm 1983) has recommended the use of this material as a standard and it has been established by the Expert Committee on Biological Standardization of the World Health Organization as the International, Standard for tissue plasminogen activator, with an assigned potency of 1000 International Units per ampoule.

A Collaborative Study Designed to Establish the 4th International Standard for Heparin

1984 ◽  
Vol 52 (02) ◽  
pp. 148-153 ◽  
Author(s):  
D P Thomas ◽  
A D Curtis ◽  
T W Barrowcliffe
Keyword(s):  
Collaborative Study ◽  
International Standard ◽  
Thrombin Inhibition ◽  
Freeze Dried ◽  
Assay Methods ◽  
The Mean ◽  
International Collaborative ◽  
International Collaborative Study

SummaryAn international collaborative study, in which 22 laboratories participated, was carried out to establish a replacement for the International Standard for Heparin. A total of 248 assays were analyzed, including APTT, thrombin inhibition and anti-Xa assays, as well as pharmacopoeial assays. Overall, there was less than 5% difference in the mean potency estimates of the candidate preparations, by all assay methods. The freeze-dried preparation 82/502 demonstrated the closest parallelism by bioassay to the existing standard and was established by WHO as the 4th International Standard for Heparin, with an assigned unitage of 1780 i.u. per ampoule.

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