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urethra
On a Theory of the Infusion Method of Measuring the "Opening Pressure" in the Urethra
      
At rest the muscles which control the urethra (urine duct) are contracted and its lumen is practically equal to zero over its entire length.
      
To open the urethra, a mechanical effort (due, for example, to a pressure rise in the bladder) must be applied.
      
A widespread method of estimating the "blocking capability" of the urethra consists in inserting a catheter with lateral perforations near the end.
      
The problems of theoretical biomechanical studies of the urine formation and excretion system (urinary system), from renal filtration to urine motion in the urethra, are reviewed.
      
Methods Sub-adult pigs were fitted, under anaesthesia, with permanent catheters in the portal vein, carotid artery and urethra, and with an electromagnetic flow probe around the portal vein.
      
A flexible laser Doppler probe was introduced into the urethra of two females and two male subjects.
      
Amezinium metilsulfate most probably stimulates both α1B-receptors in the vascular wall and α1A/D-receptors in the proximal urethra.
      
The concentrations of ampicillin in urethra and cervix were assayed by means of alginate swabs that were used as diffusion centres on agar diffusion plates.
      
The median ampicillin concentration in the male urethra one hour after the single dose of bacampicillin plus probenecid was 2.0 μg/ml of urethral secretion and increased to 3.2 μg/ml two hours after administration of the antibiotic.
      
In the female urethra, the median concentrations of ampicillin were 1.5 μg/ml and 2.3 μg/ml of urethral secretion one and two hours, respectively, after the same dosage as above.
      
Das ?urethrale Syndrom" beruht wahrscheinlich auf geringgradigen Obstruktionen der Urethra sowie auf ?Blasen-Sphinkter-Dyssynergie".
      
We examined patients attending an STD clinic (Department of Dermatology, Lasarettet, Lund).Chlamydia trachomatis was demonstrated in 26% of 2021 male patients by culture from the urethra (using cyclo-heximide-treated McCoy cells).
      
They also had fewer leucocytes in smears from the urethra.
      
The epithelial cells provide secretions that empty through ducts into the urethra to form a major component of the seminal plasma of the ejaculate.
      
The obvious differences in the environmental conditions of urethra, bladder, and prostate could favor strains that have the ability to adapt.
      
False negative results in the urine DIF-test were mostly observed in males with a low number of EBs in the urethra.
      
Although many variations on surgical technique exist, the most common cause remains attributable to hypersuspension of the urethra.
      
Prostate cancer locally invading the urethra can be effectively managed with transurethral resection or ablation procedures or urethral stenting.
      
Exercise-induced hematuria can originate in the kidney, bladder, urethra, or prostate.
      
 

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