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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.
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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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A z score (or standardized value) is measured in units of the standard deviation. It tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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z scores are the standardized values obtained after converting a normal distribution into a standard normal distribution. A z score is measured in units of the standard deviation. The z score tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a z score of...
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Score for Differentiating Pleural Tuberculosis from Malignant Effusion.

Alejandra González1, Mariano Fielli2, Adrián Ceccato3

  • 1Pneumonology, Hospital Nacional Profesor Alejandro Posadas, Haedo, El Palomar, Buenos Aires 1684, Argentina. alestork@yahoo.com.ar.

Medical Sciences (Basel, Switzerland)
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Summary

A new score effectively differentiates tuberculous (TBE) from malignant (ME) pleural effusions using age, glucose, proteins, and lactic acid. This tool aids in diagnosing difficult lymphocytic pleural effusion cases with high accuracy.

Keywords:
neoplasiapleural effusionscoretuberculosis

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Area of Science:

  • Pulmonology
  • Medical Diagnostics
  • Biochemistry

Background:

  • Distinguishing between tuberculous (TBE) and malignant (ME) lymphocytic pleural effusions presents a clinical challenge.
  • Accurate differentiation is crucial for timely and appropriate patient management.

Purpose of the Study:

  • To develop and validate a predictive score for differentiating TBE from ME effusions.
  • To improve diagnostic accuracy in cases of lymphocytic pleural effusion.

Main Methods:

  • Prospective cohort study of 138 patients with pleural effusion.
  • Analysis of pleural fluid parameters including glucose, LDH, proteins, white cell count, lactic acid, and pH.
  • Logistic regression and Wald test used to develop a diagnostic score based on age, glucose, proteins, and lactic acid.

Main Results:

  • Eighty-two samples (47 TBE, 35 ME) were analyzed.
  • A score incorporating age, glucose, proteins, and lactic acid was developed.
  • A cutoff score of eight achieved 93.5% sensitivity and 78% specificity for TBE vs. ME, with an AUC of 0.915.

Conclusions:

  • The developed score demonstrates high accuracy in differentiating tuberculous from malignant pleural effusions.
  • This scoring system offers a valuable, non-invasive tool for clinical practice.
  • Further validation may enhance its utility in diagnosing lymphocytic pleural effusions.