Ureteral access sheath or percutaneous nephrostomy during flexible ureteroscopy: which is better?

Studies in literature discussed the drawbacks of the ureteral access sheath use in flexible ureteroscopy and in the same time mentioned the benefits of ureteral access sheath in decreasing the incidence of urosepsis and better stone free rate. In the current study we aim to compare between percutaneous nephrostomy tube (PCN) insertion before flexible ureteroscopy and conventional ureteral access sheath (UAS) flexible ureteroscopy in terms of safety, efficacy and perioperative outcomes. In all, 100 Patients aged 20 to 67 years with upper ureteric stones and mild hydronephrosis or renal pelvic stones less than 20 mm with mild hydronephrosis were randomized into 2 groups; patients undergoing PCN insertion before flexible ureteroscopy, and patients undergoing the conventional UAS flexible ureteroscopy.

Effect of radiofrequency electromagnetic waves of mobile phone stations on male fertility.

Purpose: To determine the effect of electromagnetic waves of mobile phone stations on several sperm parameters and the male reproductive system.

Methods: This observational study was performed on 216 subjects, aged 18-60 years. Two equal groups of subjects were assigned to group A (study group) if they were living close to cell phone tower stations for at least 6 months and group B (control group) formed from individuals living 100 meters away from cell phone tower stations.