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Pneumothorax-I01:26

Pneumothorax-I

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A pneumothorax is a condition where air builds up in the space between the lung and the chest wall, causing the lung to collapse. This condition arises when air enters the space between the parietal and visceral pleura, disrupting the negative pressure essential for lung inflation. This can lead to a partial or complete collapse of the lung.
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Clinical Manifestations:
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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Related Experiment Video

Updated: Feb 1, 2026

C-arm-Free Simultaneous OLIF51 and Percutaneous Pedicle Screw Fixation in a Single Lateral Position
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Does Ipsilateral-Dependent Positioning During Percutaneous Lung Biopsy Decrease the Risk of Pneumothorax?

Thomas Leger1, Naim Jerjir1, Jules Gregory1

  • 11 Department of Radiology, Cochin Hospital, Descartes University, 27 rue du Faubourg Saint Jacques, 75 014 Paris, France.

AJR. American Journal of Roentgenology
|December 13, 2018
PubMed
Summary

Placing patients in an ipsilateral-dependent position during CT-guided transthoracic biopsy did not reduce pneumothorax rates. However, this position may offer benefits like protecting the contralateral lung during hemoptysis.

Keywords:
biopsylungpneumothorax

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Area of Science:

  • Medical Imaging and Intervention
  • Thoracic Surgery
  • Pulmonology

Background:

  • Percutaneous CT-guided transthoracic biopsy is a common procedure for diagnosing lung abnormalities.
  • Pneumothorax is a known complication, and strategies to minimize its occurrence are actively researched.
  • Patient positioning is one factor that may influence complication rates.

Purpose of the Study:

  • To evaluate if an ipsilateral-dependent position during percutaneous CT-guided transthoracic biopsy affects the rate of pneumothorax.
  • To identify risk factors associated with pneumothorax and the need for drainage catheter insertion.

Main Methods:

  • A retrospective study of 516 patients undergoing CT-guided core needle biopsies.
  • Patients were divided into two groups: ipsilateral-dependent position (Group A) and other positions (Group B).
  • Statistical analysis, including chi-square tests, Fisher exact tests, and regression analyses, was used to compare outcomes and identify risk factors.

Main Results:

  • The overall pneumothorax rate was similar between Group A (22.3%) and Group B (22.5%), with no statistical difference (p=0.97).
  • Rates of pneumothorax requiring drainage catheter insertion were also comparable (6.4% in Group A vs. 6.6% in Group B, p=0.90).
  • Independent risk factors for pneumothorax included needle path length, emphysema along the needle track, and fissure crossing.

Conclusions:

  • The ipsilateral-dependent position did not significantly reduce the pneumothorax rate in CT-guided transthoracic biopsies.
  • Despite not reducing pneumothorax, the position may offer advantages, such as contralateral lung protection in cases of severe hemoptysis.
  • Needle path length, emphysema, and fissure crossing are significant risk factors for pneumothorax in this procedure.