ABSTRACT
BACKGROUND AND PURPOSE: Urinary oxalate excretion is a risk factor for nephrolithiasis and is a result of endogenous metabolism and gastrointestinal processes. Gastrointestinal absorption of oxalate has been well demonstrated but to our knowledge evidence for secretion of oxalate is absent in humans. The objective of this study was to measure the amount and conformation of oxalate in the stomach and small intestine of adult subjects undergoing gastrointestinal endoscopy. MATERIALS AND METHODS: Eleven adults participated in this study. Gastrointestinal fluid was collected from the stomach and small intestine during endoscopy. A determination of the soluble and insoluble components of oxalate was made by centrifugation of the sample and subsequent acidification of the resultant pellet and supernatant. Samples were processed and the amount of oxalate was measured by ion chromatography, the limit of which is 1.6 µM. RESULTS: The majority of small intestinal samples contained some degree of oxalate. This is in contrast to the stomach where minimal oxalate was detected. There was a wide range of oxalate concentrations and a greater degree of insoluble oxalate in small intestinal samples. CONCLUSIONS: Our results suggest that some degree of oxalate secretion in the small intestine may occur in the fasted state while this is less likely in the stomach. Further studies are warranted to provide definitive evidence of gastrointestinal secretion of oxalate.
Subject(s)
Intestine, Small/chemistry , Oxalates/analysis , Stomach/chemistry , Adult , Aged , Chromatography, Ion Exchange/methods , Endoscopy, Gastrointestinal , Fasting/metabolism , Female , Gastric Mucosa/metabolism , Humans , Intestinal Absorption , Intestine, Small/metabolism , Male , Middle Aged , Nephrolithiasis , Oxalates/chemistry , Oxalates/metabolismABSTRACT
Ureteroscopy is being increasingly utilized in the treatment and management of patients with renal and ureteral stones. Improving stone-free rates with ureteroscopy decreases the need for ancillary procedures and improves patient outcomes and satisfaction. This article reviews contemporary literature regarding the efficacy of a wide range of currently available techniques for improving stone-free rates with this procedure.
ABSTRACT
INTRODUCTION AND HYPOTHESIS: Outcomes of xenografts in incontinence surgery are uncommon. Our objective was to report long-term outcomes of women after porcine dermis (PD) bladder neck sling. METHODS: Seventy women completed a mean follow-up of 62.1 months. "Global cure" equaled SEAPI subjective composite = 0 and visual analog score ≥8. "Stress urinary incontinence (SUI) cure" equaled SEAPI-subjective (S) subset = 0 and negative cough stress test. RESULTS: The SUI cure rate was 42.9 % and global cure rate was 11.4 %. Perioperative complications were seen in <10 % of women. The mean time to SUI recurrence was 10.4 months, with 30 of 40 women redeveloping SUI <12 months after sling. Twenty women (28.6 %) have since undergone additional anti-incontinence procedures. There was a significant postoperative improvement in SEAPI scores, daily pad use, and quality of life (QOL) indices. CONCLUSIONS: At long-term follow-up, PD is not a durable material in sling surgery. Although QOL generally improves after surgery, most SUI recurrences occurred soon after surgery.
