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PURPOSE The emerging technique of endoluminal ultrasonography (ELUS) provides a new modality for endoscopic visualization of the urinary tract which needs to be further evaluated. We studied the normal anatomy of distal ureter and ureterovesical junction using ELUS. MATERIALS AND METHODS An assessment of in vitro ELUS ureteric images undertaken at 1 mm.(More)
PURPOSE Experiments were performed to quantify the duration and frequency of ureteric peristaltic activity in the laparotomized and non-laparotomized pig in its virgin and postinstrumented states. MATERIALS AND METHODS Pigs (n = 10) in a steady state of hydration were studied under halothane anesthesia in two groups. The study was undertaken in two(More)
PURPOSE The accumulation of urine in the renal pelvis causes depolarisation of non-specific muscular pace-maker cells. The wave of depolarisation spreads distally in the ureteric smooth muscle cells via gap junctions. This wave of excitation causes a coordinated peristaltic contraction which transports the urine bolus distally to the bladder. The EMG(More)
OBJECTIVES To establish the characteristics of mechanical activity during ureteral peristalsis and unidirectional bolus transport, pressure changes in the middle and distal (juxtavesical and ureterovesical junction) porcine ureter were quantified in vivo. METHODS Five female New Yorkshire pigs (50 to 60 kg) were studied under halothane anesthesia. The(More)
Ureteric peristalsis transports a urinary bolus from the renal pelvis to the bladder. We developed an intraluminal catheter with a pressure transducer on it to study intraluminal pressure changes and a twin bipolar electrode to record the ureteric EMG and impedance (Z) changes during a peristaltic wave. Five female New Yorkshire pigs (50-60 kg) were studied(More)
PURPOSE We evaluated in vivo the role of muscarinic receptors on ureteral peristaltic frequency and contraction force in a large animal model using pharmacological manipulation. MATERIALS AND METHODS A total of 12 female pigs weighing a mean +/- SEM of 72 +/- 4 kg were chronically instrumented using an electronic pressure monitoring catheter in the right(More)
BACKGROUND The valve function of the ureterovesical-junction (UVJ) is responsible for protection of the low pressure upper urinary tract from the refluxing of urine from the bladder. Controversy about the microanatomy of the human ureterovesical-junction persists. METHODS Ten (3 male and 7 female) fresh cadaveric bladders (mean age 70 years old) were(More)
ObjectiveThis study was performed to investigate the analgesic effects of lidocaine and lidocaine/tramadol combination in epidural anaesthesia in dromedary camels. DesignExperimental Study AnimalsEight healthy immature dromedary camels ProceduresThe camels were randomly designed in 2 equal groups. In group L: lidocaine 2% (0.22 mg/kg) and in group LT: a(More)
To evaluate the role of adrenergic and nitrergic signaling on ureteric peristaltic frequency and contraction force in vivo using a large animal model. Twelve female pigs (72 ± 4 kg) were chronically instrumented with an electronic pressure-monitoring catheter in the right ureter. Nephrostomy, cystostomy, and arterial and venous catheters were left in situ.(More)
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