Cystometry and Cystometrogram: Understanding Urodynamic Testing

Cystometry is a diagnostic procedure used to evaluate bladder function by measuring pressure changes as the bladder fills and empties.

What is Cystometry?

Cystometry, also known as a cystometrogram (CMG), assesses the bladder’s ability to store and release urine effectively. It measures intravesical pressure during bladder filling and voiding.

Procedure

The test involves inserting a catheter into the bladder to measure pressure responses. A second catheter placed in the rectum or vagina measures abdominal pressure to differentiate true bladder contractions.

Limitations of Cystometry

• Invasive nature may cause discomfort.
• Results may be affected by patient anxiety or movement.
• Limited ability to replicate natural voiding conditions.
• Potential risk of false positives or negatives due to physiological variations.

Complications

• Urinary tract infection (UTI) due to catheterization.
• Hematuria (presence of blood in urine).
• Temporary discomfort or bladder irritation.
• Rarely, bladder perforation.

Clinical Significance

Cystometry helps diagnose conditions like neurogenic bladder, urinary incontinence, and bladder outlet obstruction, aiding in tailored treatment approaches.

Conclusion

Cystometry is a valuable urodynamic test despite its limitations and potential complications. Physicians must carefully interpret results in correlation with clinical findings.