Chung Kwong Yeung

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PURPOSE We provide updated, clinically useful recommendations for treating children with monosymptomatic nocturnal enuresis. MATERIALS AND METHODS Evidence was gathered from the literature and experience was gathered from the authors with priority given to evidence when present. The draft document was circulated among all members of the International(More)
The Doppler waveform of the ureteric jet is the result of modification of ureteric peristalsis by an active sphincteric mechanism of the vesicoureteric junction (VUJ). The monophasic pattern is associated with immaturity. This study set out to see the correlation between this immature pattern with urinary tract infection (UTI) and vesicoureteric reflux(More)
This paper is a comprehensive review of the Doppler waveform appearance of ureteric jets. Six jet waveform patterns have been identified: monophasic, biphasic, triphasic, polyphasic, square and continuous. Details of the physical properties of jet patterns and their changes under various physiological conditions are illustrated. The immature monophasic(More)
The nature of the action of the vesicoureteric junction (VUJ) in humans is still controversial. We were interested in the reasons why the jet consists of several peaks. We hypothesised that the modification of the jet into a variable number of peaks is the result of an active sphincter mechanism at the VUJ. A total of 1,010 subjects of all ages and both(More)
The objective of this study was to evaluate the clinical outcome of infants diagnosed perinatally with primary obstructive megaureter, and to determine which anatomical and physiological indexes best predict such outcome. A total of 67 megaureters thought to be due to primary vesicoureteral junction obstruction was detected in 53 newborns as a result of(More)
PURPOSE Congenital bladder anomalies are a major challenge to pediatric urologists. Understanding the mechanism of bladder development is crucial for advancing patient treatment. Current evidence suggests that Shh (R&D Systems) is an epithelial signal regulating bladder development, although the mechanism of the regulation is still unclear. We examined the(More)
OBJECTIVE To examine the characteristics of primary vesico-ureteric reflux (VUR) in young infants following prenatal hydronephrosis. PATIENTS AND METHODS The study comprised 155 consecutive infants with VUR detected at a mean age of 8.7 weeks (SD 6.3). Reflux units (n = 236) were analysed for relationships between gender, severity of reflux, exposure to(More)
PURPOSE We studied bladder dysfunction in children with significant primary nocturnal enuresis refractory to treatment. MATERIALS AND METHODS We evaluated 33 Chinese boys and 8 girls with a mean age of 10.4 years, who had significant monosymptomatic primary nocturnal enuresis (3 or more wet nights weekly) after desmopressin treatment with or without an(More)
OBJECTIVE To assess the feasibility of continuous real-time ambulatory bladder monitoring in infants and young children using a specially developed ambulatory urodynamic data logger with built-in infrared telemetric on-line facilities. PATIENTS AND METHODS Twenty-nine infants and young children (mean age 3.9 years, range 7 weeks to 9.5 years) with various(More)