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Pediatr Radiol. 2004 Feb;34(2):138-142. Epub 2003 Nov 18.
High incidence of nephrocalcinosis in extremely preterm infants treated with dexamethasone.

Cranefield DJ, Odd DE, Harding JE, Teele RL.

Department of Radiology, National Women's Hospital, Private Bag 92189, Auckland, New Zealand.

BACKGROUND. The use of postnatal corticosteroids to treat or prevent chronic lung disease is common in very preterm infants. Medullary nephrocalcinosis has been noted as a possible side effect. OBJECTIVE. This prospective study was designed to assess the incidence of nephrocalcinosis in extremely preterm infants exposed to dexamethasone. PATIENTS AND METHODS. A prospective study of extremely preterm infants, recruited to a randomized trial of dexamethasone treatment for chronic lung disease, was initiated. Infants had US of the renal tract scheduled on entry into the study, at day 28 and at discharge or at the corrected gestational age of 36 weeks. RESULTS. Thirty-three infants were enrolled in the study. Birth weight ranged between 440 and 990 g and gestation between 24 and 28 weeks. Nine infants died and six had incomplete data. Because there was no difference in incidence of calcification between those on the short course and those on the long course of dexamethasone, analysis was made on the entire cohort. One infant had nephrocalcinosis at the time of the initial US examination on day 26 of life. By day 28, nephrocalcinosis was present in 31% of those with complete data. By discharge, or corrected gestational age of 36 weeks, US evidence of nephrocalcinosis was present in 15 (83%) of 18 infants. All infants had at least one course of an aminoglycoside antibiotic during the study. All infants had parenteral nutrition. Only four infants received furosemide more regularly than single doses. The longest course was 10 days, received by an infant who did not develop nephrocalcinosis. CONCLUSION. The incidence of nephrocalcinosis is high in this group of sick, extremely preterm infants. Dexamethasone may be a factor in the development of nephrocalcinosis. Future research should focus on the natural history of nephrocalcinosis in extremely preterm infants.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14624322&dopt=Abstract [PubMed - as supplied by publisher]

Neuroreport. 2003 Dec 2;14(17):2177-81.
Mechanisms of secretion of ATP from cortical astrocytes triggered by uridine triphosphate.

Abdipranoto A, Liu GJ, Werry EL, Bennett MR.

SUMMARY: The mechanisms involved in autocrine ATP release from cultured astrocytes isolated from the rat cortex were investigated using an online bioluminescence technique. Astrocytes released ATP in response to application of 10 microM uridine triphosphate, which was blocked by the non-specific purinergic receptor antagonist suramin. Intracellular pathways of the uridine triphosphate-stimulated ATP release were seen to involve inositol triphosphate and calcium with the assistance of the Golgi-complex and cytoskeleton as the release was inhibited by phospholipase C antagonist lithium, endoplasmic reticulum calcium-dependent ATPase inhibitor thapsigargin, F-actin interruptor cytochalasin D and Golgi-complex interruptor brefeldin A. The uridine triphosphate-stimulated ATP release was also potently blocked by exocytosis inhibitor botulinum toxin A and anion transporter blockers furosemide and glibenclamide. These results suggest that calcium-dependent exocytosis and transportation via anion transporters are the predominant secretion mechanisms for uridine triphosphate-stimulated ATP release from cortical astrocytes.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14625443&dopt=Abstract [PubMed - in process]

Am J Transplant. 2003 Dec;3(12):1566-9.
Metabolic alkalosis after orthotopic liver transplantation.

Raj D, Abreo K, Zibari G.

Division of Nephrology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA.

To ascertain the etiology of metabolic alkalosis (MA) following orthotopic liver transplantation (OLT) the records of patients with 123 consecutive OLTs from 1995 to 2000 were reviewed. Metabolic alkalosis occurred in 51.2% of patients. Patients with MA had a larger fluid deficit (-3991 +/- 4324 vs. -1018 +/- 4863, p < 0.05), cumulative furosemide dose (406 +/- 356 vs. 243 +/- 189, p < 0.02), and citrate load from blood transfusions (9164 +/- 4870 vs. 7809 +/- 3967, p < 0.05). There was no difference in serum lactate concentration (3.15 +/- 1.63 vs. 3.11 +/- 1.91) in patients with and without MA. The duration of ICU stay was longer in patients with MA (14.9 +/- 15.3 vs. 5.3 +/- 3.9 days, p < 0.004). Treatment of severe MA in 19 (15.4%) patients consisted of 0.1 N hydrochloric acid and/or acetazolamide. Hypokalemia and hypomagnesemia occurred in 37.4% and 59.3% of patients, respectively. In conclusion, MA is a common post-OLT complication that is associated with a longer ICU stay. Diuretic-induced volume depletion, the citrate load from blood transfusions, hypokalemia, and hypomagnesemia contribute to the pathogenesis of MA in OLT.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14629287&dopt=Abstract [PubMed - in process]

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