Michael Hsieh

Endocrine disruptors, such as environmental compounds with endocrine-altering properties, may cause hypospadias and crytorchidism in several species, including humans. Anogenital distance is sexually dimorphic in many mammals, with males having longer anogenital distance on average than females. Animal models of proposed endocrine disruptors have associated prenatal exposure with hypospadias, cryptorchidism, and reduced anogenital distance. Human studies have correlated shorter anogenital distance to in utero exposure to putative endocrine disruptors. We review preliminary data suggesting that anogenital distance is reduced in boys with hypospadia and cryptorchidism. Hence, human hypospadias and cryptorchidism may be associated with reduced anogenital distance as a result of endocrine disruption.

... ROBERT R. MUDER"-* MARCIE BOLDIN' CAROLE BRENNEN" MICHAEL HSIEH" RICHARD M. VICKERS" KENNETH MITCHUM* YING C. YEE'* "Veterans Affairs Medical Center University Drive C ... Yourassowsky, E., van der Linden, MP, Lismont, MJ & Crokaert, F. (1981). ...

1. Eur Urol. 2011 Aug;60(2):395. Words of wisdom: Re: Does varicocele repair improve male infertility? An evidence-based perspective from a randomized, controlled trial. Eisenberg ML, Lipshultz LI. Scott Department of Urology, Baylor College of Medicine, Houston, TX 77030, USA. mleisenb@bcm.edu. Comment on Eur Urol. 2011 Mar;59(3):455-61. PMID: 21703969 [PubMed]. Publication Types: Comment.

Objective: To apply Markov models to assess the cost effectiveness of the relative impact of obstructive interval and female partner age on fertility using either assisted reproductive technology (ART) or vasectomy reversal, and elucidate the impact of these variables on fertility.

PURPOSE: We hypothesized that there are practice variations in the use of surgical antibiotics by pediatric urologists in the United States. MATERIALS AND METHODS: A 31-question online survey was distributed to members of the Society of Pediatric Urology. The questionnaire examined physician preferences for surgical antibiotic use, including indications, antibiotic selection, timing of administration, and duration.

Background Testicular autotransplantation is used for high undescended testicles and it involves harvesting the intra-abdominal testicle and the recipient vessels with microanastomosis between these and the spermatic artery and vein. The traditional open approach includes a laparotomy and an open dissection of the inferior epigastric vessels. This approach is associated with a long scar and pain.

Pediatric urinary tract infections (UTIs) occur in 2.6–3.4% of children each year and account for over 1.1 million office visits annually in the US. 1 Inpatient hospital costs alone for pediatric UTI are estimated to be over $180 million each year and have steadily risen despite shorter hospital stays.

The inherent dynamics of the master manipulator of a teleoperated robot-assisted surgery (RAS) system can affect the movements of a human operator, in comparison with free-space movements. To measure the effects of these dynamics on operators with differing levels of surgical expertise, a da Vinci Si system was instrumented with a custom surgeon grip fixture and magnetic pose trackers. We compared users' performance of canonical motor control movements during teleoperation with the manipulator and freehand cursor control, and found significant differences in several aspects of motion, including target acquisition error, movement speed, and acceleration. In addition, there was preliminary evidence for differences between experts and novices. These findings could impact robot design, control, and training methods for RAS.