The Importance of Residual Urine Measured After the Second Miction in the Evaluation of Benign Prostatic Hyperplasia Patients with Lower Urinary Tract Symptoms

Abstract

Objectives: Examine the correlation between the results of bladder voiding after uroflowmetry (PVR1) and second voiding (PVR2), and to investigate the factors affecting this in patients presented with lower urinary tract symptoms (LUTS) due to benign prostatic hyperplasia (BPH).Methods: The study included fifty-five male patients presented to the urology outpatient clinic with LUTS and followed up with the diagnosis of BPH. The study was designed as self-controlled and prospective. All patients' medical records were taken and physical examinations, biochemistry, PSA tests and urinalysis were performed. Patients with diseases other than BPH were excluded from the study. Ultrasound (US) of the urinary tract was started when the patients felt the first urge to urinate. The size of prostate gland was measured from the dimensions. Immediately after bladder void-ing on uroflowmetry device following the examination, PVR1 was measured using US. Following the measurement, the patient was kept waiting for five minutes and PVR2 was measured again with US immediately after the second bladder voiding. A PVR of ≥50 mL was considered as residual urine.Results: The difference between PVR1 and PVR2 was statistically significant (p