Skip to main content
Log in

A three-year evaluation of hemostatic function in Singaporean Norplant acceptors

  • Published:
Advances in Contraception

Abstract

In a longitudinal study involving 100 Singaporean women, results indicate that the acceptors persist in having a possibly increased predisposition to thrombosis, as evidenced by a significant increase in platelet count and aggregability. Furthermore, the shortened prothrombin time and activated partial thromboplastin time, together with changes in vitamin K factors, still indicate the possible enhanced potential for hypercoagulation.

Resumé

Dans l'étude longitudinale effectuée sur 100 femmes singapouriennes, les résultats indiquent que celles-ci ont continué à présenter ce qui est peut-être une prédisposition accrue à la thrombose, ainsi que l'a fait ressortir l'augmentation significative du nombre de plaquettes et de leur possibilité d'agrégation. En outre, le raccourcissement du temps de prothrombine et l'accélération du temps de thromboplastine partielle associés aux changements des facteurs de la vitamine K indiquent encore la possibilité d'une élévation potentielle de l'hypercoagulation.

Resumen

En el estudio longitudinal efectuado con 100 mujeres de Singapur, los resultados indican que continúan presentando lo que puede ser una predisposición acrecentada a la trombosis, según lo señalado por un aumento significativo del número de plaquetas y su posible agregación. Por otra parte, el acortamiento del tiempo de protrombina y la aceleración del tiempo de tromboplastina parcial asociados con los cambios de los factores de la vitamina K continúan indicando la posibilidad de un aumento potencial de la hipercoagulación.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Royal College of General Practitioners (1974).Oral Contraceptives and Health: A Preliminary Report. Pitman Medical Publishing Co., Ltd., New York

    Google Scholar 

  2. PollerL. (1978). Oral contraceptives, blood clotting and thrombosis.Br. Med. Bull.,34, 151

    PubMed  Google Scholar 

  3. NoteloviyzM., KitchensC.S., CooneL., McKenzieL. and CarterR. (1981). Low-dose oral contraceptives; usage and coagulation.Am. J. Obstet. Gynecol.,141, 71–75

    PubMed  Google Scholar 

  4. MargulisR., AmbrusJ.L., MinkL. and StrykerJ. (1965). Progestational agents and blood coagulation.Am. J. Obstet. Gynecol.,93, 161–166

    PubMed  Google Scholar 

  5. BellerF.K. and BorgesR.F. (1967). Blood coagulation and fibrinolytic enzyme studies during cyclic and continuous application of progestational agents.Am. J. Obstet. Gynecol.,97, 448–459

    PubMed  Google Scholar 

  6. PollerL., ThomsonJ.K., ThomasW. and WrayC. (1971). Blood clotting and platelet aggregation during oral progestogen contraception: a follow-up study.Br. Med. J.,27, 705

    Google Scholar 

  7. DensonK.W.E. (1972). Techniques appendix 2, pp. 609–636. In:Human Blood Coagulation, Haemostatis and Thrombosis, R.Biggs, ed., Blackwell Scientific Publications, London

    Google Scholar 

  8. ThomsonJ.M. (1970).A Practical Guide to Blood Coagulation and Haemostasis, pp.174. Churchill Livingstone, London

    Google Scholar 

  9. RatnoffO.D. and MenzieI. (1951). A new method for the determination of fibrinogen in small samples of plasma.J. Lab. Clin. Med.,37, 316–320

    PubMed  Google Scholar 

  10. DensonK.W.E., BorettR. and BiggsR. (1971). The specific assay of prothrombin using the Taipan snake venom.Br. J. Haematol.,21, 219–226

    PubMed  Google Scholar 

  11. BiggsP., EvelingJ. and RichardsG. (1955). The assay of antihaemophilic globulin activity.Br. J. Haematol.,1, 21

    Google Scholar 

  12. DensonK.W.E. (1961). The specific assay of Prower-Stuart Factor and Factor VII.Acta Haematol.,25, 105–120

    PubMed  Google Scholar 

  13. BiggsR., DensonK.W.E., AkmanN., BorettR. and HaddonM.E. (1970). Antithrombin III, antifactor Xa and heparin.Br. J. Haematol.,19, 283–285

    PubMed  Google Scholar 

  14. NilssonC.G. and HolmaP. (1981). Menstrual blood loss with contraceptive subdermal levonorgestrel implants.Fertil. Steril.,35, 304–306

    PubMed  Google Scholar 

  15. KohC.L.S., TsakokF.H.M. and RatnamS.S. (1982). The influence of pH and pregnancy on the level of plasminogen activator activity as measured by the fibrin plate method.Singapore J. Obstet. Gynaecol.,13, 206–214

    Google Scholar 

  16. MerskeyC., KleinerG.J. and JohnsonA.J. (1966). Quantitative estimation of split products and fibrinogen in human serum: relation to diagnosis and treatment.Blood,28, 11–13

    Google Scholar 

  17. BornG.V.R. and CrossM.J. (1963). The aggregation of blood platelets.J. Physiol.,169, 178–195

    Google Scholar 

  18. LaurellC.B. (1965). Quantitative estimation of proteins by electrophoresis in agarose gel containing antibodies.Anal. Biochem.,15, 45–52

    Google Scholar 

  19. SinghK., ViegasO., KohS., SinghP. and RatnamS.S. (1988). The effects of Norplant on clinical chemistry in Singapore acceptors after one year of use: haemostatic changes.Contraception,38 (3), 313–323

    PubMed  Google Scholar 

  20. Singh, K., Viegas, O., Koh, S., Singh, P. and Ratnam, S.S. (1988). Two-year follow-up of changes in clinical chemistry in Singaporean Norplant acceptors: haemostatic changes.Contraception, (in press)

  21. HirschJ. (1981). Blood test for the diagnosis of venous and arterial thrombosis.Blood,57, 1

    PubMed  Google Scholar 

  22. ShaabanM.M., ElwanS.I., El-KabashM.Y., FarghalyS.A. and ThabetN. (1984). Effect of levonorgestrel contraceptive implants (Norplant) on blood coagulation.Contraception,30, 421–430

    PubMed  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Singh, K., Viegas, O.A.C. & Ratnam, S.S. A three-year evaluation of hemostatic function in Singaporean Norplant acceptors. Adv Contracept 6, 23–32 (1990). https://doi.org/10.1007/BF01849484

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01849484

Keywords

Navigation