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Pleural effusion is an abnormal fluid accumulation in the pleural cavity, a narrow space between the lungs and the chest wall. It is not a disease per se but rather a symptom or indication of an underlying disease. In normal circumstances, this space contains a small amount of fluid (5 to 15 mL), a lubricant facilitating the non-frictional movement of the pleural surfaces.
There are two main types of pleural effusion: transudative and exudative. They are differentiated using Light's...
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Pleural Effusion II: Symptoms and Management01:28

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Pleural Effusion Overview
A pleural effusion is the abnormal collection of fluid between the parietal and visceral pleura layers of tissue that form the lining of the lungs and chest cavity. It can occur independently or due to surrounding parenchymal diseases, such as infection, malignancy, or inflammatory conditions.
Clinical Manifestations:
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Respiratory System Abnormal Finding II: Palpation and Auscultation01:31

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In assessing respiratory abnormalities, palpation and auscultation are critical tools for detecting and interpreting various pathophysiological changes. These techniques provide insight into underlying disorders by evaluating tactile sensations and sounds produced by the respiratory system.
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Physical assessment of the respiratory tract is critical in identifying potential health issues. One key component of this assessment is palpation, a technique healthcare providers use to assess the body for abnormalities. This content explores the method of palpation in evaluating the respiratory tract, focusing on thoracic palpation and tactile fremitus.
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Echocardiography plays a role in assessing cardiac health and detecting heart conditions, with various types providing critical insights for diagnosis and treatment.
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Point-of-Care Lung Ultrasound in Adults: Image Acquisition
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Ecocogenicidad Cuantitativa del Líquido Pleural para Diferenciar Derrames Pleurales Transudativos de Exudativos

Alaa A El-Dakkak1, Mona El-Hoshy1, Maged Hassan1

  • 1Pulmonology Department, Faculty of Medicine, Alexandria University, Alexandria, EGY.

Cureus
|December 22, 2025
PubMed
Resumen

Un novedoso índice, la ecogenicidad relativa del líquido pleural (PFRE), puede diferenciar entre derrames pleurales transudativos y exudativos utilizando la ultrasonografía torácica. Este método no invasivo muestra una precisión moderada en la distinción de los tipos de derrame.

Palabras clave:
ecogenicidadexudadosderrame pleuralultrasonido torácicotransudados

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Área de la Ciencia:

  • Imagenología Médica
  • Ultrasonido de Diagnóstico
  • Neumología

Sus antecedentes:

  • La ecografía torácica (TUS) es más sensible que la radiografía de tórax para identificar líquido pleural.
  • La diferenciación entre transudados y exudados es crucial para el manejo del paciente.
  • Los métodos actuales se basan en procedimientos invasivos o técnicas de imagen menos sensibles.

Objetivo del estudio:

  • Evaluar la eficacia de un novedoso índice, la ecogenicidad relativa del líquido pleural (PFRE), para diferenciar de forma no invasiva los exudados de los transudados.
  • Evaluar la estimación cuantitativa de la ecogenicidad del derrame pleural mediante TUS.
  • Comparar la PFRE con marcadores bioquímicos y los criterios de Light.

Principales métodos:

  • Se reclutaron 140 pacientes con derrame pleural.
  • Se analizaron imágenes de TUS para cuantificar la ecogenicidad utilizando un novedoso índice (PFRE), comparando el líquido pleural con la ecogenicidad hepática.
  • Se evaluó la capacidad predictiva de la PFRE frente a los criterios de Light.

Principales resultados:

  • La PFRE fue significativamente diferente entre transudados (mediana 0,26) y exudados (mediana 0,55) (p<0,001).
  • La PFRE mostró una correlación positiva con la proteína del derrame y una correlación negativa con los niveles de glucosa.
  • El área bajo la curva (AUC) para la PFRE fue de 0,77, con un punto de corte de ≤0,236 que demostró un 47,73% de sensibilidad y un 90,62% de especificidad para el derrame transudativo.

Conclusiones:

  • La ecogenicidad relativa del líquido pleural (PFRE) ofrece un método no invasivo para diferenciar entre derrames pleurales transudativos y exudativos.
  • El índice PFRE basado en TUS demuestra una precisión moderada en la distinción de los tipos de derrame.
  • Este enfoque cuantitativo puede ayudar en la toma de decisiones clínicas para los derrames pleurales.