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Measurement of vessel diameter during angioplasty: are we accurately performing this task?
Loay Salman1, Roberto I Vazquez-Padron, Hector Castro
1Interventional Nephrology, University of Miami Miller School of Medicine, Miami, Florida.
Insights
The lead ruler method used in fluoroscopy often underestimates angioplasty balloon and vessel diameter. This measurement discrepancy is crucial for accurate stent and balloon sizing in endovascular procedures.
Area of Science:
- Medical Imaging
- Interventional Cardiology
- Vascular Surgery
Background:
- Accurate vessel diameter measurement is critical for successful angioplasty and stent placement.
- Fluoroscopy with a calibrated lead ruler is a common method for in-procedure vessel sizing.
- Potential inaccuracies in this measurement technique require thorough investigation.
Purpose of the Study:
- To prospectively evaluate the accuracy of lead ruler-based fluoroscopic measurements of vessel diameter during angioplasty.
- To compare measured angioplasty balloon sizes with their actual manufacturer-specified dimensions.
- To identify factors influencing measurement discrepancies, such as the distance between the ruler and the vessel.
Main Methods:
- Prospective study involving 37 chronic hemodialysis patients undergoing angioplasty.
- Fluoroscopy machine calibrated to a lead ruler with lead markers.
- Measurement of fully effaced angioplasty balloons in vivo.
- Comparison of calibrated fluoroscopic measurements with actual balloon diameters and assessment of ruler-to-vessel depth.
Main Results:
- Angioplasty balloons measured via calibrated fluoroscopy were consistently smaller than actual sizes (mean underestimation 25.8%, range 13.75-40.83%, p < 0.0001).
- A trend indicated that increased distance between the lead ruler and the target vessel exacerbated the underestimation.
- The lead ruler method systematically underestimates vessel diameter.
Conclusions:
- The lead ruler method for determining vessel diameter during angioplasty is prone to significant underestimation.
- Awareness of this systematic error is essential for clinicians when selecting angioplasty balloons and endovascular stents.
- Accurate sizing is vital to optimize procedural outcomes and prevent complications.
Abstract:
Vessel diameter is objectively measured by a lead ruler positioned in the fluoroscopic field and software calibration during angioplasty. We conducted a prospective study to evaluate the accuracy of lead ruler determination of vessel diameter. Chronic hemodialysis patients undergoing an angioplasty procedure were included in this study (n = 37). Vessel diameter was determined by calibrating the fluoroscopy machine to a ruler with lead markers placed in the fluoroscopic field. The same calibration was used to measure the fully effaced angioplasty balloon in its intravascular location. We compared the measured balloon diameter with the actual (manufacturer's) diameter. The approximate depth of the ruler from the measured vessel was also determined. Angioplasty balloons appeared 13.75-40.83% (mean 25.8% ± 7.015) smaller than the actual size of the balloon (p < 0.0001) when measured using a calibrated fluoroscopic machine. There was a tendency toward the fact that the bigger the distance between the ruler and the vessel (that contained the angioplasty balloon), the more likely the technique underestimated the size of the angioplasty balloon. Lead ruler method underestimates the diameter of the vessel. Recognizing such a discrepancy is important when determining the size of an angioplasty balloon or endovascular stent.
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