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Related Experiment Videos

D-dimer levels in pleural effusions.

O Dikensoy1, G T Stathopoulos, Z Zhu

  • 1Saint Thomas Hospital, 4220 Harding Road, and Vanderbilt University, Nashville, TN 37232, USA.

Respiratory Medicine
|January 24, 2006
PubMed
Summary
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D-dimer levels in pleural fluid do not differentiate bloody from non-bloody effusions. This study found no significant difference, indicating D-dimer is not useful for diagnosing effusion causes.

Area of Science:

  • Medical Diagnostics
  • Pulmonary Medicine
  • Biochemistry

Background:

  • D-dimer, a fibrin degradation product, is a marker of coagulation activation.
  • Pleural effusions can be hemorrhagic or non-hemorrhagic, with varying underlying causes.
  • Distinguishing persistently bloody effusions from thoracentesis-induced ones is clinically relevant.

Purpose of the Study:

  • To investigate if pleural fluid D-dimer levels can differentiate hemorrhagic from non-hemorrhagic pleural effusions.
  • To determine if D-dimer levels can distinguish persistently bloody effusions from thoracentesis-induced bloody effusions.
  • To assess the utility of pleural fluid D-dimer in narrowing the differential diagnosis of pleural effusions.

Main Methods:

  • Analyzed 40 pleural effusions across various disease states.

Related Experiment Videos

  • Measured D-dimer levels using ELISA.
  • Assessed red blood cell count, white blood cell count, lactate dehydrogenase, and protein levels.

    • Main Results:

    • No significant difference in D-dimer levels was found between bloody and non-bloody effusions (P=0.88).
    • D-dimer levels did not correlate with red blood cell count, white blood cell count, LDH, or protein levels.
    • No significant differences were observed between disease groups or in distinguishing effusion types.

    Conclusions:

    • Pleural fluid D-dimer measurement is not effective in distinguishing hemorrhagic from non-hemorrhagic effusions.
    • D-dimer levels do not aid in differentiating thoracentesis-induced bleeding from persistent hemorrhage.
    • The study concludes that pleural fluid D-dimer is not a useful diagnostic marker for pleural effusions.