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[Application of modified microbubble test in peripherally inserted central venous catheters tip positioning].

Jiale Zhang1, Ning Zhao, Fen Liu

  • 1Department of Critical Care Medicine, the First Affiliated Hospital of Nanchang University, Nanchang 330006, Jiangxi, China. Zhang Jiale is working on the Department of ICU, Qilu Hospital of Shandong University, Jinan 250012, Shandong, China. Corresponding author: Jiang Rong,

Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
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Summary

The modified microbubble test accurately identifies peripherally inserted central venous catheter (PICC) tip placement with high sensitivity and specificity. This noninvasive method offers a time- and cost-effective alternative to traditional imaging for PICC tip positioning.

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Area of Science:

  • Medical Imaging
  • Vascular Access Devices
  • Diagnostic Accuracy

Background:

  • Accurate placement of peripherally inserted central venous catheters (PICCs) is crucial for patient safety and treatment efficacy.
  • Traditional methods for verifying PICC tip position, such as chest X-ray, involve radiation exposure and can be time-consuming.
  • There is a need for noninvasive, accurate, and efficient methods to confirm PICC tip placement.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of a modified microbubble test for peripherally inserted central venous catheter (PICC) tip positioning.
  • To compare the modified microbubble test's performance against chest X-ray as the gold standard.
  • To determine if the modified microbubble test is a viable, cost-effective, and time-saving alternative for PICC tip verification.

Main Methods:

  • A prospective study enrolled 108 patients requiring ultrasound-guided PICC placement.
  • Patients underwent modified microbubble testing and chest X-ray for PICC tip localization.
  • Diagnostic evaluation indexes, including sensitivity and specificity, were calculated using chest X-ray as the reference standard.

Main Results:

  • The modified microbubble test demonstrated high sensitivity (95.7%) and specificity (89.7%) for identifying ideal PICC tip positions.
  • A moderate correlation (contingency coefficient = 0.662) was observed between microbubble density and catheter tip location.
  • The overall agreement between the modified microbubble test and chest X-ray was good (Kappa value = 0.86).

Conclusions:

  • The modified microbubble test is a sensitive and specific, noninvasive method for confirming peripherally inserted central venous catheter tip position.
  • This test offers a simple, less time-consuming, and lower-cost alternative to chest X-ray, particularly suitable for intensive care unit (ICU) settings.
  • While effective as a screening tool, chest X-ray remains necessary for cases with technical limitations or diagnostic uncertainty.