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Transudative pleural effusions.

Clinics in Chest Medicine

|March 1, 1985

Summary

This summary is machine-generated.

Transudative pleural effusions result from altered systemic factors, not direct pleural involvement. Diagnosis is confirmed by specific pleural fluid protein and LDH ratios, with heart failure being the most common cause.

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Area of Science:

Pulmonology
Internal Medicine

Background:

Transudative pleural effusions arise from systemic factors affecting pleural fluid balance.
The pleural surfaces are not directly involved in the underlying pathology.

Purpose of the Study:

To define the diagnostic criteria for transudative pleural effusion.
To identify common causes and outline management strategies.

Main Methods:

Analysis of pleural fluid characteristics, including protein and lactate dehydrogenase (LDH) levels.
Comparison of pleural fluid values to serum values and established normal ranges.

Main Results:

Transudates are characterized by a pleural fluid to serum protein ratio < 0.5.
Transudates exhibit a pleural fluid to serum LDH ratio < 0.6.

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Pleural fluid LDH is less than two-thirds the upper limit of normal serum LDH.

Conclusions:

Congestive heart failure is the most frequent cause of transudative pleural effusion.
Other common causes include pulmonary embolism, cirrhosis with ascites, and nephrotic syndrome.
Management focuses on the primary disease, with tetracycline pleurodesis for refractory cases.