Biomedical subjects
Publications and source records attributed to Howard N Winfield.
Bladder neck identification and dissection is a difficult step in performing laparoscopic radical prostatectomy. We describe a transurethral technique that facilitates laparoscopic identification and incision of the bladder neck. All cases were successful, with clear and sharp bladder neck margins. All bladder neck surgical margins were tumor free.
It has been postulated that gaseous insufflation of the abdominal cavity results in temperature elevation, particularly in children, and that the use of heating blankets should be avoided during laparoscopic surgery. On review of the last 102 laparoscopic genitourinary cases, we conclude that the use of nonheated, nonhumidified carbon dioxide for insufflation during laparoscopic surgery under a general anesthetic results in mild hypothermia. The use of warming devices in this setting is both safe and appropriate. Children have a rise in temperature relative to preoperative measurement, although they are explicitly capable of hypothermia. Neither the duration of the procedure, the surgical approach, nor conversion to open exploration had a significant impact on temperature regulation. Adrenalectomy results in more exaggerated temperature changes than do other laparoscopic procedures.
PURPOSE: In the interest of maintaining our surgical domain we performed a survey aimed at establishing laparoscopic practice patterns as they pertain to urological disease. MATERIALS AND METHODS: Surveys were mailed to 2,902 surgeons in California who were listed with the American College of Surgeons, including 2,175 general surgeons, 510 urologists and 217 obstetricians-gynecologists. RESULTS: A total of 442 complete responses (15.2%) were tallied. Of urologists and of nonurologists 54% and 11% performed no laparoscopy, while 12% and 80%, respectively, devoted at least 5% of their time to laparoscopic surgery. Urologists and nonurologists performing no laparoscopy were older than those performing a significant volume (p < 0.05). Of urologists 16% thought that they were trained adequately during residency to perform laparoscopic surgery compared with 30% of nonurologists. Of the urologists who performed hand assisted laparoscopy, 50% tended to use it as a means of gaining familiarity with these techniques. These urologists performed more laparoscopic surgery than other urologists. While 80% of laparoscopy cases were community based, academic urologists are actively interested in laparoscopic surgery. The 2 most important reasons cited for performing laparoscopy were more rapid recovery and decreased morbidity. The leading laparoscopic procedures according to incidence for urologists performing laparoscopic surgery were diagnostic procedures (12.9%), varicocelectomy (12.1%), adrenalectomy (9.7%), pelvic lymphadenectomy (8.9%), and simple nephrectomy and renal cyst decortication (8.1% each). The leading laparoscopic cases according to the number of available cases per urologist were colposuspension-bladder neck suspension (1.06), donor nephrectomy (0.77), pelvic lymphadenectomy (0.52), varicocelectomy (0.48) and orchiopexy (0.45). Urologists performed more urological laparoscopy cases than nonurologists. CONCLUSIONS: Urological laparoscopic practice in California remains in its infancy. It is imperative that exposure should be increased in residency training programs.
There are reports of a wide variety of foreign materials, placed purposefully or inadvertantly, that have been found in the lower urinary tract. Due to encrustatation, some of these objects may initially appear to be simple stones. A careful evaluation with an appropriate index of suspicion is needed to aid in the determination of whether one of these complex structures may be present. A determination of the composition of the structure will allow the surgeon to employ the most safe and expeditious means of removal. We report a case of a large bladder stone with a metal wire infrastructure that was removed by open cystolithotomy
PURPOSE: We examined the status of laparoscopy in urology and the impact of residency and fellowship training on the performance of laparoscopy as primary surgeon. We also examined whether performing nonsurgical tasks requiring two-handed dexterity had any link to the adoption of laparoscopic techniques by urologists. MATERIALS AND METHODS: A total of 8760 laparoscopy questionnaires containing 135 queries were mailed to urologists listed on the American Urological Association practicing urologists mailing list. The questions sought information on area of practice, time in practice, fellowship training, ambidexterity, laparoscopic experience, and experience with robotics. The response rate was 1.8% (155 of 8760). RESULTS: There appeared to be no significant correlation between the performance of laparoscopic surgery and participation in activities requiring bimanual dexterity. However, a correlation of strong statistical significance did exist between laparoscopic residency training and performance of laparoscopy after residency (p=0.003. There also was a correlation between fellowship training in laparoscopy/endourology and doing laparoscopy as primary surgeon. CONCLUSIONS: Participation in laparoscopic surgery during residency training is a major determining factor in performance of laparoscopy as a primary surgeon in practice. Younger surgeons trained in laparoscopy during residency are performing more laparoscopy post residency than those without laparoscopic training during residency. At present, there is a need to train more urologists in laparoscopy at the postgraduate level.
BACKGROUND AND PURPOSE: The technique of laparoscopic partial nephrectomy has matured significantly over the past decade and is emerging as an oncologically sound procedure for the management of small renal tumors. Methods of tumor excision as well as parenchymal reconstruction in a hemostatically controlled field have evolved to make this procedure safer. Improved techniques to minimize warm renal ischemia are being developed. Finally, methods to prevent positive surgical margins during laparoscopic surgery are crucial to a satisfactory oncologic outcome. These important technical issues, as well as the current results of laparoscopic partial nephrectomy, are discussed. MATERIALS AND METHODS: The urologic peer-review literature related to nephron-sparing surgery was reviewed. Controversial issues with respect to the surgical approach, methods of hemostatic control, acceptable time of warm ischemia, and cooling techniques were reviewed and collated. Perioperative results from larger series of laparoscopic and open partial nephrectomy were evaluated. RESULTS: Open nephron-sparing surgery for renal tumors < or =4 cm has cancer control equivalent to that of open radical nephrectomy. Evidence is now emerging that laparoscopic partial nephrectomy will provide similar oncologic results, although clinical follow-up is still early. Blood loss, postoperative pain, and convalescence seem to be favor the laparoscopic approach. Complication rates, primarily postoperative bleeding and urine leak, may be higher than for open nephron-sparing surgery. Methods of laparoscopic hemostatic control favor soft vascular clamping for larger tumors that are more endophytic and central. Smaller exophytic lesions may be managed without renal vascular control using a variety of coagulative and hemostatic tools. Data related to warm renal ischemia suggest that the time used for tumor excision and renal reconstruction should be 30 minutes or less. Techniques for laparoscopic renal cooling are being developed. CONCLUSIONS: Laparoscopic nephron-sparing surgery is a technique in evolution but with a promising outlook. The urologic peer-review literature reflects an exponential growth in interest, which suggests that this minimally invasive approach is practical and may benefit our patient population so as to allow them to return to normal healthy living more quickly.