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Related Experiment Videos

Blood back flow into angiographic catheters

M A Savin1, W H Bush, F L Starr

  • 1Department of Radiology, University of Washington Medical Center, Seattle, USA.

Journal of Vascular and Interventional Radiology : JVIR
|September 1, 1995
PubMed
Summary

Blood backflow into catheters depends on the fluid used and catheter angle. Angled-down catheters with contrast media showed more backflow, while horizontal catheters with saline showed more backflow, impacting thrombus formation risk.

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Area of Science:

  • Medical Devices
  • Cardiovascular Research
  • Interventional Radiology

Background:

  • Catheter use in procedures like angiography carries a risk of thrombus formation.
  • Understanding fluid dynamics within catheters is crucial for patient safety.
  • Blood backflow can influence the deposition of blood components and thrombus development.

Purpose of the Study:

  • To quantify blood backflow into catheters filled with different fluids.
  • To investigate the impact of catheter orientation on blood backflow.
  • To assess the role of fluid type (saline vs. contrast media) in blood backflow.

Main Methods:

  • In vitro study using pulsatile human blood circulation.
  • Catheters filled with saline, non-ionic contrast, or ionic contrast media were tested.

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  • Blood backflow was measured across various catheter orientations (angled downward and horizontal).

    • Main Results:

    • Significant blood backflow (7.0 cm) observed in contrast-filled catheters angled downward, compared to saline (0.5 cm).
    • Conversely, horizontal catheters showed greater backflow with saline (3.6 cm) than contrast media (0.4 cm).
    • The ionic nature of contrast media did not influence the degree of blood backflow.

    Conclusions:

    • Blood backflow into catheters is substantial and influenced by catheter fluid content and orientation.
    • Findings highlight the importance of adjusting angiographic techniques based on fluid and catheter position.
    • These adjustments are critical for mitigating risks such as thrombus formation and ensuring patient safety.