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Antithrombin III deficiency

M Cucuianu1, S Blaga, S Pop

  • 1First Medical Clinic, Cluj-Napoca, Romania.

Romanian Journal of Internal Medicine = Revue Roumaine De Medecine Interne
|April 1, 1994
PubMed
Summary
This summary is machine-generated.

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Familial antithrombin deficiency presents in varied forms. Studies on two families reveal quantitative and qualitative antithrombin III (AT III) defects linked to thrombotic events.

Area of Science:

  • Hematology
  • Genetics
  • Clinical Medicine

Background:

  • Familial antithrombin deficiency is a heterogeneous group of inherited disorders.
  • Antithrombin III (AT III) is a key regulator of coagulation, and its deficiency increases thrombotic risk.

Observation:

  • Two Romanian families with recurrent thrombotic episodes were studied.
  • Family 1 exhibited heterozygous Type I (quantitative) AT III deficiency with 50% normal antigen and activity.
  • Family 2 showed two brothers with severely reduced AT III heparin cofactor activity (13-16%) and normal antigen levels, suggesting a qualitative defect.

Findings:

  • The first family presented with a quantitative deficiency in antithrombin III.
  • The second family displayed characteristics of a qualitative antithrombin III deficiency, potentially due to an abnormality in the heparin-binding site, with affected individuals being homozygotes or compound heterozygotes and unaffected parents being heterozygotes.

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Implications:

  • Understanding the heterogeneity of familial antithrombin deficiency is crucial for accurate diagnosis and risk assessment.
  • Distinguishing between quantitative and qualitative AT III deficiencies aids in predicting thrombotic risk and guiding management strategies.
  • Identification of qualitative AT III defects, particularly those affecting the heparin-binding site, highlights the importance of functional assays in diagnosing thrombophilia.