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Procedures for Kidney StonesMedical intervention is necessary when kidney stones or renal calculi are too large to pass spontaneously (typically greater than 5 millimeters) when stones are accompanied by symptomatic infection (such as fever or pyelonephritis), when they impair kidney function, or when they cause persistent symptoms like severe pain, nausea, or urinary retention. Additionally, patients with only one kidney or those who cannot be treated with medical management also require...
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Endoscopic Stone Composition Identification: Is Accuracy Improved by Stone Appearance During Laser Lithotripsy?

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Videos during laser lithotripsy offer minimal improvement in stone identification accuracy for urologists. While confidence increased, overall accuracy remained low, cautioning against relying solely on visual endoscopic appearance for metabolic management guidance.

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Area of Science:

  • Urology
  • Endourology
  • Medical Imaging

Background:

  • Accurate kidney stone identification is crucial for effective treatment and metabolic management.
  • Current methods rely on visual assessment during procedures like ureteroscopy with laser lithotripsy.
  • The utility of dynamic video versus static images for improving diagnostic accuracy is not well-established.

Purpose of the Study:

  • To compare the accuracy and confidence of urologists in identifying kidney stone types using videos versus still pictures during holmium laser lithotripsy.
  • To assess the impact of video visualization on rectification and confounding of stone identification answers.

Main Methods:

  • A survey was distributed to urologists, presenting images and videos of four major stone types during ureteroscopy with holmium laser lithotripsy.
  • Participants answered multiple-choice questions on stone composition and confidence levels.
  • Accuracy, confidence, and answer changes (rectification/confounding) after video viewing were analyzed.

Main Results:

  • Overall accuracy for stone identification was low, with no significant difference between pictures (43.8%) and videos (46.1%).
  • Videos marginally improved accuracy for only one specific stone type (cystine).
  • Urologists reported significantly higher confidence when viewing videos (65.4%) compared to pictures alone (53.7%), but this did not correlate with improved accuracy.

Conclusions:

  • Visual identification of kidney stones during laser lithotripsy using endoscopic appearance has low accuracy, regardless of whether videos or still pictures are used.
  • Increased confidence with video visualization does not translate to improved diagnostic accuracy.
  • Urologists should exercise caution when using endoscopic stone appearance to guide metabolic management strategies.