In vitro pleural fluid clottability and fibrinogen content

Area of Science:

• Pulmonary Medicine
• Clinical Chemistry
• Pathology

Background:

• Pleural fluid analysis is crucial for diagnosing various thoracic conditions.
• Fibrinogen and protein levels are commonly measured, but their role in pleural fluid loculation is not fully understood.
• Loculation can complicate pleural fluid management and treatment.

Purpose of the Study:

• To investigate the presence and levels of fibrinogen in pleural fluid.
• To determine the correlation between fibrinogen levels, protein content, and pleural fluid clottability in vitro.
• To assess the relationship between these parameters and the occurrence of pleural fluid loculation.

Main Methods:

• Quantitative analysis of fibrinogen and total protein in 23 pleural fluid specimens.
• In vitro clottability assessment using recalcification time.
• Comparison of findings between non-loculated and loculated pleural effusions.

Main Results:

• Fibrinogen was undetectable in pleural fluids from all four patients with loculation.
• In non-loculated effusions, 11 of 19 specimens lacked detectable fibrinogen, while 8 had a mean level of 55.0 mg%.
• In vitro clottability did not correlate with in vivo coagulation or loculation; fibrinolytic activity was observed only in non-loculated, non-fibrinogen-containing fluids.

Conclusions:

• Absence of detectable fibrinogen in loculated pleural effusions suggests it may not be a reliable marker for in vivo coagulation in these cases.
• In vitro clottability assays may not accurately reflect the in vivo processes leading to pleural fluid coagulation and loculation.
• Further research is needed to elucidate the mechanisms underlying pleural fluid loculation and the role of fibrinogen.