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[Bacteriological examinations using the invagination catheter]

R Augustin, G Schmid, H Wisser

Schweizerische Medizinische Wochenschrift

|April 4, 1981

Summary

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Suprapubic bladder aspiration and transurethral "invagination catheter" methods for obtaining bladder urine samples are equally effective for bacterial analysis. The invagination catheter method avoids introducing bacteria into the bladder.

Area of Science:

Urology
Microbiology
Medical Diagnostics

Context:

Accurate urine sample collection is crucial for diagnosing urinary tract infections.
Traditional transurethral catheterization methods can sometimes introduce bacteria, potentially affecting diagnostic results.
Suprapubic bladder aspiration is an invasive method for obtaining sterile urine samples.

Purpose:

To compare the diagnostic accuracy of bladder urine collection via suprapubic aspiration versus a novel transurethral "invagination catheter" technique.
To assess the reliability and repeatability of the invagination catheter method in female patients.
To determine if the invagination catheter introduces bacterial contamination into the bladder.

Summary:

Quantitative and qualitative bacteriological analyses were performed on bladder urine samples obtained using suprapubic aspiration and the invagination catheter in 80 women.

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No significant differences in bacterial counts or types were observed between the two methods, indicating diagnostic equivalence.

Repeatability studies with the invagination catheter in 52 patients showed identical bacteriologic results, and importantly, this method did not appear to introduce bacterial agents into the bladder.

Impact:

The invagination catheter offers a non-invasive, equivalent alternative to suprapubic aspiration for obtaining sterile bladder urine samples in women.
This technique has the potential to improve diagnostic accuracy for urinary tract infections by minimizing procedural contamination.
Clinical adoption of the invagination catheter could lead to more reliable and less invasive urine sample collection protocols.