What Is a Urodynamic Evaluation?

Urodynamic examination is a branch of urology. It is based on the basic principles and methods of urinary fluid mechanics and electrophysiology. It measures the pressure, flow rate and bioelectrical activities of various parts of the urinary tract to understand the urinary tract discharge Function and mechanism, and the pathophysiology of urination dysfunction. A comprehensive urodynamic examination is an ideal method to quantify urinary tract function intuitively.

Urodynamic examination is a branch of urology. It is based on the basic principles and methods of urinary fluid mechanics and electrophysiology. It measures the pressure, flow rate and bioelectrical activities of various parts of the urinary tract to understand the urinary tract discharge. Function and mechanism, and the pathophysiology of urination dysfunction. A comprehensive urodynamic examination is an ideal method to quantify urinary tract function intuitively.

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Urodynamic test

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Clinical significance of urodynamic examination

Investigate the physiological process and dysfunction of urine storage and urination.

Precautions for urodynamic examination

Precautions before the test: One hour before the test, ask the patient to drink 500ml of boiling water and urinate the bladder, and then start the test to measure the urine flow rate and volume. Then put the thin tube for the test to measure the residual urine volume. Then, measure the pressure and volume of the bladder, and cooperate with the EMG activity to see if there is a detrusor-sphincter inconsistency, because this phenomenon may cause difficulty or urgency and dysuria. Finally, the urinary bladder pressure was checked. The tube is then placed on a urethral press to measure urethral pressure at rest or when coughing hard to assess the patient's leakage. Precautions after examination: (1) After examination, there will be temporary pain or slight hematuria in urination. (2) After checking, please drink plenty of water to avoid inflammation.

Urodynamic examination

Urodynamic examination includes the following items: (1) Urine flow rate chart: The urine output, urine flow time, urine flow speed can be measured, and the residual urine volume can be determined. In order to understand the urination function of the bladder and urethra, the normal maximum urine flow rate should be greater than 15ml per second for men and 20ml for women. The bladder muscles are not functioning properly or the urethra is abnormal, such as: urethral stricture, detrusor depletion of the bladder, and prostatic hypertrophy. Causes slower urine flow. (2) Urethral pressure map: The highest urethral pressure, urethral closure pressure, urethral functional length, and prostate urethral length can be measured. And can help diagnose diseases such as stress urinary incontinence. (3) Volumetric pressure chart for injecting and emptying the bladder: The bladder volume can be measured, and the problems of the bladder during urinary storage and urination can be understood. (4) Electromyography: Determine the function of the external sphincter, and find out whether the detrusor and the sphincter are coordinated.

Urodynamic examination related diseases

Bladder neck obstruction in women, bladder neck obstruction in older women, benign prostatic hyperplasia, chronic prostatitis, neurogenic bladder.

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