CNS sites activated by renal pelvic epithelial sodium channels (ENaCs) in response to hypertonic saline in awake rats.

In some patients, renal nerve denervation has been reported to be an effective treatment for essential hypertension. Considerable evidence suggests that afferent renal nerves (ARN) and sodium balance play important roles in the development and maintenance of high blood pressure. ARN are sensitive to sodium concentrations in the renal pelvis. To better understand the role of ARN, we infused isotonic or hypertonic NaCl (308 or 500mOsm) into the left renal pelvis of conscious rats for two 2hours while recording arterial pressure and heart rate. Subsequently, brain tissue was analyzed for immunohistochemical detection of the protein Fos, a marker for neuronal activation. Fos-immunoreactive neurons were identified in numerous sites in the forebrain and brainstem. These areas included the nucleus tractus solitarius (NTS), the lateral parabrachial nucleus, the paraventricular nucleus of the hypothalamus (PVH) and the supraoptic nucleus (SON). The most effective stimulus was 500mOsm NaCl. Activation of these sites was attenuated or prevented by administration of benzamil (1µM) or amiloride (10µM) into the renal pelvis concomitantly with hypertonic saline. In anesthetized rats, infusion of hypertonic saline but not isotonic saline into the renal pelvis elevated ARN activity and this increase was attenuated by simultaneous infusion of benzamil or amiloride. We propose that renal pelvic epithelial sodium channels (ENaCs) play a role in activation of ARN and, via central visceral afferent circuits, this system modulates fluid volume and peripheral blood pressure. These pathways may contribute to the development of hypertension.

Analyzing quality of colorectal cancer care through registry statistics: a small community hospital example.

As the quantity of elderly Americans requiring oncologic care grows, and as cancer treatment and medicine become more advanced, assessing quality of cancer care becomes a necessary and advantageous practice for any facility.' Such analysis is especially practical in small community hospitals, which may not have the resources of their larger academic counterparts to ensure that the care being provided is current and competitive in terms of both technique and outcome. This study is a comparison of the colorectal cancer care at one such center, Falmouth Community Hospital (FCH)--located in Falmouth, Massachusetts, about an hour and a half away from the nearest metropolitan center--to the care provided at a major nearby Boston Tertiary Center (BTC) and at teaching and research facilities across New England and the United States. The metrics used to measure performance encompass both outcome (survival rate data) as well as technique, including quality of surgery (number of lymph nodes removed) and the administration of adjuvant treatments, chemotherapy, and radiation therapy, as per national guidelines. All data for comparison between FCH and BTC were culled from those hospitals' tumor registries. Data for the comparison between FCH and national tertiary/referral centers were taken from the American College of Surgeons' Commission on Cancer, namely National Cancer Data Base (NCDB) statistics, Hospital Benchmark Reports and Practice Profile Reports. The results showed that, while patients at FCH were diagnosed at both a higher age and at a more advanced stage of colorectal cancer than their BTC counterparts, FCH stands up favorably to BTC and other large centers in terms of the metrics referenced above. Quality assessment such as the analysis conducted here can be used at other community facilities to spotlight, and ultimately eliminate, deficiencies in cancer programs.