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Pleural fluid characteristics of chylothorax
Fabien Maldonado1, Finn J Hawkins, Craig E Daniels
1Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN 55905, USA.
Mayo Clinic Proceedings
|February 3, 2009
Summary
Chylous pleural fluid diagnosis can be challenging, as the fluid may not appear milky and triglyceride levels can be misleading, especially in fasting patients. This highlights the need for careful interpretation of biochemical parameters in diagnosing chylothorax.
Area of Science:
- Medical Biochemistry
- Pulmonology
- Diagnostic Medicine
Background:
- Chylothorax, characterized by chylomicrons in pleural fluid, presents diagnostic challenges.
- Understanding the biochemical profile of chylous pleural effusions is crucial for accurate diagnosis.
Purpose of the Study:
- To determine the biochemical parameters of chylous pleural fluids.
- To improve the clinical diagnosis of chylothorax.
Main Methods:
- Retrospective review of 74 patients diagnosed with chylothorax over a 10-year period.
- Analysis of biochemical parameters and fluid appearance during diagnostic evaluation.
Main Results:
- Chylous pleural fluid was not always milky (44%).
- Effusions were predominantly exudative (86%), but transudative chylothorax occurred, especially in cirrhosis.
- Triglyceride levels varied, with some patients below traditional diagnostic cutoffs.
Conclusions:
- Chylothorax exhibits variable fluid appearance and biochemical characteristics.
- Non-milky and transudative effusions are possible, complicating diagnosis.
- Standard triglyceride cutoffs may fail to identify chylothorax in fasting or postoperative patients.
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