From the Research
The typical size of a ureteral stent used in adult patients is 4.8 Fr, as seen in the most recent study 1, which provides the most up-to-date evidence on ureteral stent sizes.
Ureteral Stent Size Considerations
When considering the size of a ureteral stent, it's essential to balance effective urinary drainage with patient comfort. The French size of a ureteral stent refers to its outer diameter, with each French unit equaling approximately 0.33 mm.
- Stent sizes can range from 4.8 to 8 French (Fr), with the most commonly used size being around 6 Fr, although the most recent study 1 used a 4.8 Fr stent.
- Smaller stents (4.8-5 Fr) may be used in patients with narrowed ureters or to minimize stent-related symptoms.
- Larger stents (7-8 Fr) might be selected for patients with significant debris, blood clots, or when enhanced drainage is required.
Importance of Proper Sizing
Proper sizing of the ureteral stent is crucial to prevent complications such as increased discomfort and irritation, or inadequate drainage, which can lead to obstruction or stent failure. The most recent and highest quality study 1 provides evidence that a 4.8 Fr stent can be effective in adult patients, and this size should be considered when selecting a ureteral stent.
Clinical Implications
In clinical practice, the selection of a ureteral stent size depends on the patient's anatomy, the specific clinical indication, and surgeon preference. However, based on the most recent evidence 1, a 4.8 Fr stent should be considered as a viable option for adult patients, as it provides a good balance between effective urinary drainage and patient comfort. It's also important to note that the use of ureteral stents can result in bothersome urinary symptoms and pain in approximately 80% of patients, as discussed in 2, and proper management of these symptoms is essential to improve patient outcomes.