uroflowmetry

Urine flow rate measurement is an auxiliary examination method for checking whether the urination function is normal. A urine flow meter was used to record the urine flow rate per second during urination and to draw a curve to see if there was any obstruction in the lower urinary tract. The urine flow rate parameters were calculated based on the urine flow rate curve, including maximum urine flow rate, urine flow time, average urine flow rate, maximum urine flow rate time, 2-second urine flow rate, and total urine volume. Urine flow rate measurement is a non-invasive and relatively inexpensive test item. It is a preferred and essential screening program for most patients suspected of having lower urinary tract dysfunction. Basic Information Specialist classification: urinary examination classification: urine / kidney function test Applicable gender: whether men and women apply fasting: not fasting Tips: People with urinary tract infections are not suitable for this test. Normal value Bladder volume bladder from emptiness to 150--250ml, the most obvious increase in work; when the capacity exceeds 400--500ml, the detrusor is excessively pulled and the contractility is decreased. Qmax has a certain relationship with bladder capacity. Clinical significance Abnormal results: It is generally believed that the maximum urinary flow rate of 25 ml per second or more can exclude obstruction; at 10 ml per second, the presence of obstruction is present; suspicious obstruction between the two. People who need to be examined: Suspected urinary tract obstruction. Precautions Taboo before check: Maintain normal sleep and diet. Requirements for examination: adequately protect the patient's privacy; ask the patient whether the urination represents his usual urination status; the results of automatic data analysis must be manually checked to exclude artifacts; the results must be comparable to the urination diary. Finally, ultrasound can be used to determine residual urine volume. Inspection process During the examination, the pressure catheter should be placed into the bladder (transurea or pubic puncturing) and the rectum, and connected to the respective pressure sensors. When the subject is urinating for urine flow rate measurement, the recorder can simultaneously trace four corresponding curves. Among them, the detrusor pressure curve is calculated by the electronic circuit in the instrument. From the four curves recorded, we can not only understand the maximum urinary pressure of the bladder neck opening time, the maximum urinary flow rate, the detrusor systolic blood pressure and the urine flow rate, but also the pressure and urine flow curve. The corresponding time-phase relationship is diagnosed for certain diseases (such as detrusor sphincter dyssyxia). The results of this test can also be based on the formula [918-02] / [918-01] (in the formula [918-02] for the bladder Internal pressure, [918-01] is the maximum urinary flow rate) to derive the minimum urethral resistance. This value is about 0.6 in men and 0.2 in women, and this value increases the urinary tract obstruction. The pressure inside the bladder during urination is usually 45-80 cmHO, generally not more than 100 cmHO. At the maximum urinary flow rate, the intravesical pressure is about 70-80 cmHO for men and about 55-65 cmHO for women. According to the pressure/urine flow rate measurement results, the following may occur. Not suitable for the crowd Inappropriate people: those with urinary tract infections. Adverse reactions and risks No related complications or hazards.

The material in this site is intended to be of general informational use and is not intended to constitute medical advice, probable diagnosis, or recommended treatments.