Hector Rodriguez PhD, MPH

• Professor, Health Policy and Management

https://publichealth.berkeley.edu/people/hector-rodriguez/

Impact of renal disease on natriuretic peptide testing for diagnosing decompensated heart failure and predicting mortality antibiotics for uti doxycycline keftab 750 mg for sale. N-terminal pro-B-type natriuretic peptide and B-type natriuretic peptide for identifying coronary artery disease and left ventricular hypertrophy in ambulatory chronic kidney disease patients antibiotic with sulfa keftab 250 mg order. B-type natriuretic peptide concentrations predict the progression of nondiabetic chronic 334 antibiotics for acne safe during pregnancy keftab 375 mg buy visa. Plasma B-type natriuretic peptide level predicts kidney prognosis in patients with predialysis chronic kidney disease antimicrobial questions generic keftab 375 mg with amex. Prognostic value of cardiac biomarkers for death in a non-dialysis chronic kidney disease population antibiotic treatment for chlamydia keftab 500 mg purchase line. Natriuretic peptide and adrenomedullin levels in chronic renal failure and effects of peritoneal dialysis. Association between serum n-terminal pro-brain natriuretic peptide concentration and left ventricular dysfunction and extracellular water in continuous ambulatory peritoneal dialysis patients. N-terminal pro-brain natriuretic peptide: an independent risk predictor of cardiovascular congestion, mortality, and adverse cardiovascular outcomes in chronic peritoneal dialysis patients. Is N-terminal probrain-type natriuretic peptide a clinically useful biomarker of volume overload in peritoneal dialysis patients Cardiac natriuretic peptides are related to left ventricular mass and function and predict mortality in dialysis patients. B-type natriuretic peptides strongly predict mortality in patients who are treated with long-term dialysis. Plasma B-type natriuretic peptide levels reflect the presence and severity of stable coronary artery disease in chronic haemodialysis patients. Increasing B-type natriuretic peptide levels predict mortality in unselected haemodialysis patients. Circulating C-type natriuretic peptide and its relationship to cardiovascular disease in the general population. Effects of human atrial natriuretic peptide on renal function in patients undergoing abdominal aortic aneurysm repair. Renal protective effects and the prevention of contrast-induced nephropathy by atrial natriuretic peptide. Cardiovascular and renal effects of carperitide and nesiritide in cardiovascular surgery patients: a systematic review and meta-analysis. Results of low-dose carperitide infusion in high-risk patients undergoing coronary artery bypass grafting. Effects of low-dose atrial natriuretic peptide infusion on cardiac surgery-associated acute kidney injury: a multicenter randomized controlled trial. Short-term risk of death after treatment with nesiritide for decompensated heart failure: a pooled analysis of randomized controlled trials. Risk of worsening renal function with nesiritide in patients with acutely decompensated heart failure. Effects of the renal natriuretic peptide urodilatin (ularitide) in patients with decompensated chronic heart failure: a double-blind, placebo-controlled, ascendingdose trial. Which of the cardiac natriuretic peptides is most effective for the treatment of congestive heart failure, renal failure and cancer Amelioration with vessel dilator of acute tubular necrosis and renal failure established for 2 days. Cenderitide: structural requirements for the creation of a novel dual particulate guanylyl cyclase receptor agonist with renal-enhancing in vivo and ex vivo actions. Inhibition of either angiotensin-converting enzyme or neutral endopeptidase induces both enzymes. Omapatrilat and enalapril in patients with hypertension: the Omapatrilat Cardiovascular Treatment vs. Therapeutic perspectives in hypertension: novel means for renin-angiotensin-aldosterone system modulation and emerging device-based approaches. Evidence for a splanchnic sodium input monitor regulating renal sodium excretion in man. A comparison of natriuresis after oral and intravenous sodium loading in sodium-depleted man: evidence for a gastrointestinal or portal monitor of sodium intake. Sodium challenge does not support an acute gastrointestinal-renal natriuretic signaling axis in humans. The guanylin peptide family and the proposed gastrointestinal-renal natriuretic signaling axis. Tissue kallikrein elicits cardioprotection by direct kinin b2 receptor activation independent of kinin formation. Helping the circulatory system heal itself: manipulating kinin signaling to promote neovascularization. Arterial and renal consequences of partial genetic deficiency in tissue kallikrein activity in humans. Role of tissue kallikrein in the cardioprotective effects of ischemic and pharmacological preconditioning in myocardial ischemia. Carboxypeptidase M and kinin B1 receptors interact to facilitate efficient b1 signaling from B2 agonists. Kinin B1 receptors stimulate nitric oxide production in endothelial cells: signaling pathways activated by angiotensin I-converting enzyme inhibitors and peptide ligands. Expression of endogenous nuclear bradykinin B2 receptors mediating signaling in immediate early gene activation. Targeted disruption of a B2 bradykinin receptor gene in mice eliminates bradykinin action in smooth muscle and neurons. Hypoalgesia and altered inflammatory responses in mice lacking kinin B1 receptors. Mice deficient for both kinin receptors are normotensive and protected from endotoxin-induced hypotension. Cardiovascular phenotype of a mouse strain with disruption of bradykinin B2-receptor gene. Normal blood pressure and renal function in mice lacking the bradykinin B(2) receptor. Bradykinin B1 and B2 receptors both have protective roles in renal ischemia/reperfusion injury. Overexpression of kinin B1 receptors induces hypertensive response to des-Arg9-bradykinin and susceptibility to inflammation. Identification of prolylcarboxypeptidase as the cell matrix-associated prekallikrein activator. Salt intake modulates the developmental expression of renal kallikrein and bradykinin B2 receptors. Developmentally regulated kallikrein enzymatic activity and gene transcription rate in maturing rat kidneys. Sequence variation of bradykinin receptors B1 and B2 and association with hypertension. Variation in bradykinin receptor genes increases the cardiovascular risk associated with hypertension. Functional, biochemical, and molecular investigations of renal kallikrein-kinin system in diabetic rats. Pharmacological blockade of B2-kinin receptor reduces renal protective effect of angiotensinconverting enzyme inhibition in db/db mice model. Kinins are involved in the antiproteinuric effect of angiotensin-converting enzyme inhibition in experimental diabetic nephropathy. Nephroprotection in Zucker diabetic fatty rats by vasopeptidase inhibition is partly bradykinin B2 receptor dependent. Senescence-associated phenotypes in Akita diabetic mice are enhanced by absence of bradykinin B2 receptors. Targeted deletion of B2-kinin receptors protects against the development of diabetic nephropathy. Lack of both bradykinin B1 and B2 receptors enhances nephropathy, neuropathy, and bone mineral loss in Akita diabetic mice. Renal excretion of kallikrein and eicosanoids in patients with type 1 (insulin-dependent) diabetes mellitus. Bradykinin B2 receptor gene polymorphism is associated with altered urinary albumin/ creatinine values in diabetic patients. Polymorphic genes for kinin receptors, nephropathy and blood pressure in type 2 diabetic patients. Plasma kininogen and kininogen fragments are biomarkers of progressive renal decline in type 1 diabetes. Beneficial effects of inhibition of angiotensin-converting enzyme on ischemic myocardium during coronary hypoperfusion in dogs. Differential induction of functional B1-bradykinin receptors along the rat nephron in endotoxin induced inflammation. Kinins inhibit conductive Na+ uptake by rabbit inner medullary collecting duct cells. An enhanced effect of arginine vasopressin in bradykinin B2 receptor null mutant mice. Partial genetic deficiency in tissue kallikrein impairs adaptation to high potassium intake in humans. Partial human genetic deficiency in tissue kallikrein activity and renal calcium handling. Mechanistic analysis of renal protection by angiotensin converting enzyme inhibitor in Dahl salt-sensitive rats. Long-term infusion of kallikrein attenuates renal injury in Dahl salt-sensitive rats. Kinin infusion prevents renal inflammation, apoptosis, and fibrosis via inhibition of oxidative stress and mitogen-activated protein kinase activity. Mechanisms of disease: the tissue kallikrein-kinin system in hypertension and vascular remodeling. Restriction fragment length polymorphisms mapped in spontaneously hypertensive rats using kallikrein probes. Identification of human plasma kallikrein gene polymorphisms and evaluation of their role in end-stage renal disease. Relationship between the regulatory region polymorphism of human tissue kallikrein gene and essential hypertension. Loss-of-function polymorphism of the human kallikrein gene with reduced urinary kallikrein activity. Tissue kallikrein gene polymorphisms induce no change in endothelium-dependent or independent vasodilation in hypertensive and normotensive subjects. Paracrine systems in the cardioprotective effect of angiotensin-converting enzyme inhibitors on myocardial ischemia/reperfusion injury in rats. Bradykinin prevents reperfusion injury by targeting mitochondrial permeability transition pore through glycogen synthase kinase 3beta. Early activation of bradykinin B2 receptor aggravates reactive oxygen species generation and renal damage in ischemia/reperfusion injury. Effects of kallistatin on oxidative stress and inflammation on renal ischemia-reperfusion injury in mice. Human tissue kallikrein gene delivery attenuates hypertension, renal injury, and cardiac remodeling in chronic renal failure. Delayed blockade of the kinin B1 receptor reduces renal inflammation and fibrosis in obstructive nephropathy. Bradykinin receptor 1 activation exacerbates experimental focal and segmental glomerulosclerosis. Polymorphisms in the genes encoding for human kinin receptors and the risk of end-stage renal failure: results of transmission/disequilibrium test. Characterization of two polymorphic sites in the human kinin B1 receptor gene: altered frequency of an allele in patients with a history of end-stage renal failure. The lupus-susceptibility gene kallikrein downmodulates antibody-mediated glomerulonephritis. Neutrophil-derived proteinase 3 induces kallikrein-independent release of a novel vasoactive kinin. Effect of the urotensin receptor antagonist palosuran in hypertensive patients with type 2 diabetic nephropathy. Understanding which cell in which organ does what is an integral part of knowing how the system works. Acute angiotensin type 1 receptor stimulation causes all but one of the following Shares >85% homology with angiotensin-converting enzyme in terms of its amino acid sequence b. Knowledge of its origin and actions are necessary to fully appreciate the complexites of the system. Natriuretic peptide receptor-A and natriuretic peptide receptor-C Answer: d Rationale: the nomenclature for the natriuretic peptide receptors can be confusing. Vasopressin Answer: a Rationale: Neprilysin is a zinc metalloproteinase that catalyzes the degradation of the natriuretic peptides and that has activity against over 40 other substrates (Table 11. Vascular endothelial growth factor-A is not amongst the reported substrates of neprilysin. Aldosterone actions in certain disease states involve both genomic and nongenomic effects in epithelial and nonepithelial tissues. This article addresses the cellular and molecular mechanisms underlying aldosterone-and, to some extent, cortisol-action, focusing primarily on effects on ion transport in epithelia but also highlighting key aspects of nonepithelial actions, which are of substantial importance to its pathophysiologic effects. In mammalian physiology, six classes of steroid hormones are commonly recognized- mineralocorticoid, glucocorticoid, androgen, estrogen, progestin, and the secosteroid vitamin D3. This classification was based on observed effects of these hormones and has proven robust, despite current appreciation of a much more diverse physiology of steroid hormones over and above their classic roles. In vivo, the very reactive aldehyde group cyclizes with the -hydroxyl group at carbon 11 to form the 11,18- hemiacetal and, in addition, may exist in an 11,18-hemiketal form. The outermost layer of cells represents the zona glomerulosa, which is the unique site of aldosterone biosynthesis in normal physiology (see later; aldosterone is produced in excessive amounts in patients with glucocorticoid-remediable aldosteronism).

Effect of selective aldosterone deficiency on acidification in nephron segments of the rat inner medulla virus ebola sintomas keftab 500 mg on line. Cyclosporineassociated hyperkalemia: report of four allogeneic blood stem-cell transplant cases antibiotic withdrawal keftab 250 mg purchase otc. K(+)-sparing diuretic actions of trimethoprim: inhibition of Na+ channels in A6 distal nephron cells antimicrobial or antimicrobial order keftab 750 mg online. A mechanism for pentamidineinduced hyperkalemia: inhibition of distal nephron sodium transport antibiotics for uti azithromycin keftab 500 mg overnight delivery. Hyperkalemia in patients infected with the human immunodeficiency virus: involvement of a systemic mechanism antibiotic zone of inhibition purchase discount keftab. Mutations in the mineralocorticoid receptor gene cause renal- specific pseudohypoaldosteronism type I. Mutations in subunits of the epithelial sodium channel cause salt wasting with hyperkalaemic acidosis, pseudohypoaldosteronism type 1. A mutation causing pseudohypoaldosteronism type 1 identifies a conserved glycine that is involved in the gating of the epithelial sodium channel. Evidence for genetic heterogeneity of pseudohypoaldosteronism type 1: identification of a novel mutation in the human mineralocorticoid receptor in one sporadic case and no mutations in two autosomal dominant kindreds. Systemic pseudohypoaldosteronism from deletion of the promoter region of the human Beta epithelial na(+) channel subunit. Phenotypic and genetic heterogeneity of familial hyperkalaemic hypertension (Gordon syndrome). Metabolic acidosis aggravation and hyperkaliemia in hemodialysis patients treated by sevelamer hydrochloride. The serum anion gap is altered in early kidney disease and associates with mortality. Evaluation of prescribing practices: risk of lactic acidosis with metformin therapy. A controlled clinical trial of dichloroacetate for treatment of lactic acidosis in adults. Alkaline buffers for correction of metabolic acidosis during cardiopulmonary resuscitation with focus on Tribonat­a review. D-lactate: a novel contributor to metabolic acidosis and high anion gap in diabetic ketoacidosis. Differences in metabolic and hormonal milieu in diabetic- and alcohol-induced ketoacidosis. Euglycemic diabetic ketoacidosis: a potential complication of treatment with sodium-glucose cotransporter 2 inhibition. Joint British Diabetes Societies guideline for the management of diabetic ketoacidosis. Unexplained metabolic acidosis in critically ill patients: the role of pyroglutamic acid. Regional citrate anticoagulation for continuous venovenous hemodiafiltration using calciumcontaining dialysate. Increased total to ionized calcium ratio during continuous venovenous hemodialysis with regional citrate anticoagulation. Inherited primary renal tubular hypokalemic alkalosis: a review of Gitelman and Bartter syndromes. Glucocorticoid-remediable aldosteronism is associated with severe hypertension in early childhood. An understanding of the underlying physiology is critical to the diagnostic and management approach to hyper- and hypokalemic patients. This article reviews those aspects of the physiology of potassium homeostasis judged to be relevant to the understanding of potassium disorders; a more detailed review of renal potassium transport is provided in Chapter 6. The expanding list of drugs with a potential to affect the plasma potassium concentration (K+) has made clinical management more complex, yet has provided the opportunity to new insight into potassium homeostasis. The evolving molecular understanding of both common and rare disorders affecting plasma K+ continues to uncover novel pathways of regulation. For example, military recruits have been shown to maintain a normal serum K+ level after 11 days of basic training in hot environments, despite a profound K+ deficit generated by renal and extrarenal losses. The enzyme complex is made up of a tissue-specific combination of multiple alpha, beta, and gamma subunits, which are further subject to tissue-specific patterns of regulation. Despite this widespread variation in intake, homeostatic mechanisms serve to maintain plasma K+ precisely between 3. Buffering of extracellular K+ by this large intracellular pool plays a crucial role in the regulation of plasma K+. Notably, the digoxin-ouabain binding site of alpha subunits is highly conserved, suggesting a potential role in the physiologic response to endogenous ouabain-digoxin-like compounds. These provocative data lend credence to the controversial role of such ouabain-like molecules in hypertension and cardiovascular disease. Exercise is thus a well-described cause of transient hyperkalemia; interstitial K+ in human muscle can reach levels as high as 10 mM after fatiguing exercise. Not surprisingly, an increasing number and variety of K+ channels have been implicated in the control of K+ homeostasis and the membrane potential of excitable cells such as muscle and heart, with important, evolving roles in the pathophysiology of potassium disorders. Inhibition of basal insulin secretion in normal subjects by somatostatin infusion increases serum K+ by up to 0. Cell types are as specified; Note the differences in luminal potential difference along the nephron. Again, as is the case for insulin, the effect of catecholamines on plasma K+ has been known for some time49; however, a complicating issue is the differential effect of stimulating - and -adrenergic receptors (Table 17. Uptake of K+ by liver and muscle, with resultant hypokalemia, is stimulated via beta-2 receptors. It is thought that beta-adrenergic stimulation increases K+ uptake during exercise to avoid hyperkalemia, whereas alpha-adrenergic mechanisms help blunt the ensuing postexercise nadir. Metabolic alkalosis induced by sodium bicarbonate infusion usually results in a modest reduction in serum K+. Chloride-dependent, electroneutral K+ secretion is likely mediated by a K+-Cl- cotransporter. Water transport in principal cells occurs via aquaporin-2 (Aqp-2) and aquaporins-3/4 (Aqp-3/4). Animals were adrenalectomized and replaced with aldosterone, dietary K+ and Na+ content were varied as specified. Animals were adrenalectomized and variably replaced with aldosterone (Aldo); dietary K+ content was varied. In addition to secretion, the distal nephron is capable of considerable reabsorption of K+, particularly during restriction of dietary K+. However, an important principle is that aldosterone plays a permissive, synergistic, but not essential role in K+ homeostasis. In contrast with heparin, nafamostat prolongs clotting times only in the extracorporeal circuit. Serum and glucocorticoid-regulated kinase modulates Nedd4-2-mediated inhibition of the epithelial Na+ channel. The mechanisms that underlie this so-called aldosterone paradox, the independent regulation of Na+ and K+ handling by the aldosterone-sensitive distal nephron, have been elucidated. The adrenal release of aldosterone caused by increased K+ is dependent on an intact adrenal renin-angiotensin system,173 particularly during Na+ restriction. The utility of the K+-tocreatinine ratio has been evaluated in a study of 43 patients with severe hypokalemia (range, 1. The K+-to-creatinine ratio was thus significantly lower in the patients with periodic paralysis (11 vs. In skeletal muscle, a reduction in plasma K+ will increase this ratio and therefore hyperpolarize the cell membrane. However, in some human cardiac cells, particularly Purkinje fibers in the conducting system, hypokalemia results in a paradoxic depolarization196; this paradoxic depolarization plays an important role in the genesis of hypokalemic cardiac arrhythmias. Hypokalemia causes K2P1 channels, which are normally selective for potassium, to transport sodium suddenly into cells, causing the paradoxic depolarization. Weakness and paralysis are therefore not infrequent consequences of hypokalemia of diverse causes. This novel insight may prove to be a causative effect of dietary potassium intake on atherosclerotic vascular calcification and stiffness. Short-term K+ restriction in healthy humans and patients with essential hypertension also induces Na+-Cl- retention and hypertension,29 and abundant epidemiological data has linked dietary K+ deficiency and/or hypokalemia with hypertension. In skeletal muscle, a reduction in plasma K+ will hyperpolarize the cell membrane. Furthermore, as noted, in Purkinje fibers of the human conducting system, hypokalemia results in a paradoxic depolarization. In contrast, hyperkalemia depolarizes cardiac myocytes, reducing the membrane potential from -90 mV to about -80 mV. This brings the membrane potential closer to the threshold for generation of an action potential; mild and/or rapid onset hyperkalemia will initially increase cardiac excitability because a lesser depolarizing stimulus is required to generate an action potential. Cardiac arrhythmias associated with hyperkalemia include sinus bradycardia, sinus arrest, slow idioventricular rhythms, ventricular tachycardia, ventricular fibrillation, and asystole228,229; a multitude of mechanisms are involved. However, these changes are notoriously insensitive, so that only 55% of patients with serum K+ more than 6. Relevant variables include the rapidity of the onset of hyperkalemia233,234 and the presence or absence of concomitant hypocalcemia, acidemia, and/or Table 17. Care should also be taken to distinguish the symmetrically peaked, church steeple T waves induced by hyperkalemia adequately from T wave changes because of other causes. More recently, in a mouse model for hyporeninemic hypoaldosteronism with prominent, treatable hyperkalemic acidosis, hyperkalemia was correlated with reduced expression of ammonia-generating enzymes in the proximal tubule, combined with upregulation of the ammonia-recycling enzyme glutamine synthetase. These various changes in enzyme and transporter expression were reversed by correcting the hyperkalemia. Endogenous insulin is rarely a cause of hypokalemia; however, administered insulin is a frequent cause of iatrogenic hypokalemia256 and may be a factor in the so-called dead in bed syndrome associated with aggressive glycemic control. These agents are chiefly encountered in the therapy of asthma; however, tocolytics such as ritodrine, can induce hypokalemia and arrhythmias during maternal labor. Treatment of barium poisoning with K+ serves to increase plasma K+ and displace barium from affected K+ channels280; hemodialysis is also an effective treatment. Paralysis is associated with multiple other causes of hypokalemia, both acquired and genetic. Polyethylene glycol-based bowel preparation regimens for colonoscopy can also lead to hypokalemia in older patients315 and/or patients on diuretics. Three reports initially identified a novel association between colonic pseudo-obstruction (Ogilvie syndrome) and hypokalemia as a result of secretory diarrhea with an abnormally high K+ content. Thiazides generally cause more hypokalemia21,225,261 than loop diuretics, despite their lower natriuretic efficacy. One potential explanation is the differential effect of loop diuretics and thiazides on calcium excretion. Whereas thiazides and loss-of-function mutations in the Na+-Cl- cotransporter decrease Ca2+ excretion,327 loop diuretics cause a significant calciuresis. In addition to penicillin, implicated antibiotics include nafcillin, dicloxacillin, ticarcillin, oxacillin, and carbenecillin. Drugs are also an important cause of Fanconi syndrome,333 which is often associated with significant hypokalemia (see "Renal Tubular Acidosis"). These include gentamicin, which can cause tubular toxicity with hypokalemia that can masquerade as Bartter syndrome. Hyperaldosteronism Increases in circulating aldosterone (hyperaldosteronism) may be primary or secondary. Causes include renal artery stenosis,343 Page kidney (renal compression by a subcapsular mass or hematoma, with hyperreninemia),344 a paraneoplastic process,345 or renin-secreting renal tumors. Hypertension and hypokalemia, generally attributed to increases in circulating 11-deoxycorticosterone,348 are seen in patients with congenital adrenal hyperplasia because of defects in either steroid 11-hydroxylase348 or steroid 17-hydroxylase. Contemporary reports and recommendations have thus emphasized the continued importance of adrenal vein sampling in subtype differentiation. Historically, patients have only been screened for hyperaldosteronism when hypokalemia is present; hence, even recent case series from clinics with such a referral pattern may suffer from a selection bias. Other recent series have concentrated on hypertensive patients, also a selection bias. Because increased kaliuresis in hyperaldosteronism can be induced by dietary Na+-Cl- loading or diuretics, dietary factors and/or medications may play a role in the incidence of hypokalemia at presentation. Of interest, pregnancies in affected female members of the family have been complicated by severe hypertension caused by marked increases in plasma progesterone levels induced by the gravid state. Liddle syndrome could therefore also be classified as a syndrome of apparent mineralocorticoid excess. Prostaglandin synthesis and excretion are significantly increased and may account for many of the systemic symptoms. Decreased apical K+ channels also lead to a decrease in the lumen-positive potential difference, which drives paracellular Na+, Ca2+, and Mg2+ transport. Despite the reasonable correlation between the disease gene involved and the associated subtype of familial alkalosis, there is significant phenotypic overlap and phenotypic variability in hereditary hypokalemic alkalosis. Thus, homozygous patients have much higher bone densities than unaffected wild type family members, whereas heterozygotes have intermediate values for both bone density and calcium excretion. These include patients with hypokalemic alkalosis, hypomagnesemia, and hypocalciuria after chemotherapy with cisplatin. The finding of severe hypophosphatemia with metabolic acidosis should alert clinicians to this possibility, especially if acute kidney injury is also present.

Clinical features and longterm renal outcomes of Japanese patients with obesity-related glomerulopathy antibiotics non penicillin buy keftab with a mastercard. Obesity correlates with glomerulomegaly but is not associated with kidney dysfunction early after donation antibiotic with penicillin purchase keftab 375 mg with visa. Nephron hypertrophy and glomerulosclerosis and their association with kidney function and risk factors among living kidney donors treatment for dogs false pregnancy order keftab without prescription. Expression of hepatocyte growth factor and its receptor C-met in acquired renal cystic disease associated with renal cell carcinoma infection precautions buy generic keftab on-line. Risk factors for renal glomerular and vascular changes in an autopsy-based population survey: the Hisayama study bacteria and archaea order generic keftab. Prehypertension increases the risk for renal arteriosclerosis in autopsies: the Hisayama Study. Time-zero renal biopsy in living kidney transplantation: a valuable opportunity to correlate predonation clinical data with histological abnormalities. Subclinical cardiovascular disease is associated with a high glomerular filtration rate in the nondiabetic general population. Using serum creatinine to estimate glomerular filtration rate: accuracy in good health and in chronic kidney disease. Symptomatic anterior cervical osteophyte causing dysphagia: case report, imaging, and review of the literature. Comparison of high glomerular filtration rate thresholds for identifying hyperfiltration. Age alters regional distribution of blood flow during moderate-intensity exercise. Reduced renal hemodynamic response to atrial natriuretic peptide in older volunteers. Renal hemodynamic response to maximal vasodilating stimulus in healthy older subjects. Asymmetric dimethylarginine, blood pressure, and renal perfusion in older subjects. Dimethylarginine dimethylaminohydrolase prevents progression of renal dysfunction by inhibiting loss of peritubular capillaries and tubulointerstitial fibrosis in a rat model of chronic kidney disease. Glomerular filtration rate fails to increase following protein ingestion in hypothalamo-hypophyseal-deficient adults. Haemodynamic or metabolic stimulation tests to reveal the renal functional response: requiem or revival Age, renal perfusion and function in island-dwelling indigenous Kuna Amerinds of Panama. Podocyte depletion causes glomerulosclerosis: diphtheria toxin-induced podocyte depletion in rats expressing human diphtheria toxin receptor transgene. Low birth weight and risk of progression to end stage renal disease in IgA nephropathy­a retrospective registry-based cohort study. Effects of volume expansion and contraction in normotensive whites, blacks, and subjects of different ages. Effects of age on the role of atrial natriuretic factor in renal adaptation to physiologic variations of dietary salt intake. Effect of low dose infusions of ile-atrial natriuretic peptide in healthy older males: evidence for a postreceptor defect. Effects of posture and ageing on circulating atrial natriuretic peptide levels in man. Age-related differences in fat-free mass, skeletal muscle, body cell mass and fat mass between 18 and 94 years. Renal potassium excretion: comparison between chronic renal disease patients and old people. Transtubular potassium concentration gradient: comparison between healthy old people and chronic renal failure patients. Dietary magnesium and kidney function decline: the healthy aging in neighborhoods of diversity across the life span study. Adaptation to dietary calcium and phosphorus restriction changes with age in the rat. Parathyroid hormone increases sodium/calcium exchange activity in renal cells and the blunting of the response in aging. Alterations in calcium, vitamin D, and parathyroid hormone physiology in normal men with aging: relationship to the development of senile osteopenia. Aging alters calcium regulation of serum concentration of parathyroid hormone in healthy men. Sodium-dependent phosphate transport in primary cultures of renal tubule cells from young and adult rats. Relationship between vitamin D status and left ventricular geometry in a healthy population: results from the Baltimore Longitudinal Study of Aging. Effects of 1,25-dihydroxycholecalciferol on phosphate transport in vitamin D-deprived rats. Phosphate transport in brush-border membranes from control and rachitic pig kidney and small intestine. Correction by 1-25-dihydroxycholecalciferol of the abnormal fluidity and lipid composition of enterocyte brush border membranes in vitamin D-deprived rats. Renal net acid excretion capacity is comparable in prepubescence, adolescence, and young adulthood but falls with aging. Dietary acid, age, and serum bicarbonate levels among adults in the United States. Improved mineral balance and skeletal metabolism in postmenopausal women treated with potassium bicarbonate. Treatment with potassium bicarbonate lowers calcium excretion and bone resorption in older men and women. Potassium citrate supplementation results in sustained improvement in calcium balance in older men and women. Vasopressin effects on urea and H2O transport in inner medullary collecting duct subsegments. The effect of antidiuretic hormone on water flows in isolated mammalian collecting tubules. Role of the neurohypophysis in the pathogenesis of hypertension and some allied disorders associated with aging. Aquaporin-2 downregulation in kidney medulla of aging rats is posttranscriptional and is abolished by water deprivation. Age-associated alterations in thirst and arginine vasopressin in response to a water or sodium load. Effect of age and testosterone on the vasopressin and aquaporin responses to dehydration in Fischer 344/Brown-Norway F1 rats. Body fluid balance in dehydrated healthy older men: thirst and renal osmoregulation. Anemia in clinical practice-definition and classification: does hemoglobin change with aging Association of serum erythropoietin with cardiovascular events, kidney function decline, and mortality: the health aging and body composition study. Chronic Kidney Disease (Partial Update): Early Identification and Management of Chronic Kidney Disease in Adults in Primary and Secondary Care. Chronic kidney disease controversy: how expanding definitions are unnecessarily labelling many people as diseased. Prevalence of reduced kidney function and albuminuria in older adults: the Berlin Initiative Study. Prevalence and complications of chronic kidney disease in a representative elderly population in Iceland. Two novel equations to estimate kidney function in persons aged 70 years or older. Estimating glomerular filtration rate for the full age spectrum from serum creatinine and cystatin C. Comparison of glomerular filtration rate estimating equations derived from creatinine and cystatin C: validation in the Age, Gene/Environment SusceptibilityReykjavik elderly cohort. The combined contribution of albuminuria and glomerular filtration rate to the prediction of cardiovascular mortality in elderly men. Association of serum albumin levels with kidney function decline and incident chronic kidney disease in elders. Chronic kidney disease and cardiovascular risk: epidemiology, mechanisms, and prevention. Declining estimated glomerular filtration rate and its association with mortality and comorbidity over 10 years in elderly women. Glomerular filtration rate and aging: another longitudinal Study­A long time coming! Chronic kidney disease in primary care: outcomes after five years in a prospective cohort study. Interplay between diagnostic criteria and prognostic accuracy in chronic kidney disease. Drug management in the elderly adult with chronic kidney disease: a review for the primary care physician. Targeted Apoptosis of Senescent Cells Restores Tissue Homeostasis in Response to Chemotoxicity and Aging. He has essentially been healthy apart from having two inguinal hernia repairs, and he has mild symptoms of prostatism with nocturia twice a night. Answer: c and d Rationale: In the absence of albuminuria, it is unlikely this patient has significant kidney disease. High salt intake Answer: a, b, c Rationale: All these factors predispose to hypernatremia in older adults. Total body water is reduced (replaced with greater fat mass), and therefore older adults are more prone to volume depletion. Older adults have a reduced thirst response to increased osmolality and therefore are less likely to be able to correct hypernatremia spontaneously. She exercises regularly, taking long walks three times a week with a seniors group. She is adamant that she wants to donate a kidney to her son-she sees him suffering on dialysis and wants to do everything possible to help him. Which of the following may assist in assessment of this woman as a potential donor A renal biopsy showing the presence of 10% focal and segmental glomerulosclerosis. Although not routinely used, detection of the capacity of her kidneys to respond to a protein load may indicate preservation of renal reserve. Similarly significant renal asymmetry or small kidneys would indicate potential renal ischemia or renal disease and would be exclusion factors for donation. Issues related to measurement tools, precision, bias, and interpretation are addressed for each of these variables, so that the reader may better appreciate the role of the laboratory in the diagnosis, follow-up, and management of kidney disease. Urinary abnormalities may indicate acute or chronic conditions and isolated kidney or systemic diseases, and can be used to monitor both kidney and systemic diseases. Proteinuria is similarly an important marker of kidney disease and can also be seen in acute or chronic kidney conditions. For further discussion of the physiology of glomerular ultrafiltration, please see Chapter 3. The kidney filters approximately 180 L of plasma per day, which is equivalent to 125 mL/min. Given that kidney disease is often asymptomatic and dependent on the accuracy of laboratory tests, it is imperative that the clinician knows the advantages and disadvantages of each specific test before making clinical decisions. Phosphocreatine is a source for replenishment of phosphate when adenosine triphosphate is used by muscle cells. Creatine and phosphocreatine are nonenzymatically converted at an almost steady rate (approximately 2% of total creatine per day) to creatinine. Despite its many limitations, however, its measurement is still the test most widely used by physicians to gauge renal function. Factors affecting muscle mass, such as age, sex, race, and physical activity, can in turn affect creatinine levels. Secretion of creatinine by the renal tubule is affected by Drugs (decrease secretion): For example, trimethoprim, cimetidine, pyrimethamine, dapsone. Extrarenal degradation of creatinine in the gut also rises as renal function declines due to bacterial overgrowth in the intestines leading to increased bacterial creatininase activity. Clinicians may be unaware of the intricacies and complexities of creatinine measurement and how they may be relevant to day-to-day practice. Therefore increased plasma levels may be due to factors independent of renal function, such as increased production in high protein intake, gastrointestinal bleeding due to absorption of amino acids from blood in the gastrointestinal tract, and high catabolic states such as those associated with glucocorticoid therapy. Low urea levels are seen in decreased protein intake and chronic liver disease due to reduced synthesis of urea. Urea is readily reabsorbed in the proximal tubule, particularly at low urinary flow rates. As a filtration marker, urea therefore has limited use because, although it is freely filtered, significant reabsorption means that the amount that is excreted is not what was filtered. High levels of urea may not necessarily indicate poor renal function but could instead reflect hypovolemia and renal hypoperfusion. There is wide variation in measured creatinine concentration, depending on the laboratory method and the instruments used. In 2003, the College of American Pathologists conducted a survey of 5624 participating laboratories that showed a bias from the reference value of between ­0.

However infection rates in hospitals keftab 750 mg order line, not all cases have a complete response with many patients having partial remission and sometimes no renal improvement sinus infection 9 month old purchase cheap keftab. Other immunosuppressive agents have been used for steroid-intolerant and steroid-dependent cases antibiotic 93 3109 keftab 250 mg fast delivery. Idiopathic or secondary Sjögren syndrome is a systemic illness with multiorgan involvement characterized by lymphoplasmacytic infiltration antimicrobial lighting keftab 750 mg buy online. Immunosuppression is generally used and may include steroids antibiotic resistance newspaper article purchase line keftab, azathioprine, cyclophosphamide, or mycophenolic acid. Tubulointerstitial Nephritis and Uveitis Syndrome are somewhat characteristic of this disease. Patients with drug discontinuation within 2 weeks of disease onset are more likely to recover kidney function than those who remain on the precipitating medication for 3 weeks. Weight loss, fever, anemia, and hyperglobulinemia often occur before ocular and kidney manifestations. An isolated proximal tubulopathy or Fanconi syndrome can be the initial kidney manifestation. Renal histopathology reveals a mixed inflammatory infiltrate, sometimes associated with granulomas. Steroids are the mainstay of therapy for both the ocular and kidney manifestations. Therapy typically consists of 3­6 months of prednisone with a slow taper to reduce chances of relapse, which is relatively common. Because chronic tubulointerstitial diseases may lead to decreased ability to concentrate the urine, patients may complain of nocturia. Serum uric acid levels are usually lower than expected for the degree of renal failure, presumably because of tubular defects in the reabsorption of uric acid. Anemia occurs relatively early in the course of certain forms of chronic interstitial disease, presumably because of early IgG4-related kidney disease is part of a relatively recently recognized group of disorders characterized by elevated serum levels of IgG4 subclass antibodies (60%), tissue deposition of IgG4, and involvement of various organ systems, including salivary glands, pancreas, retroperitoneum, and kidneys. IgG4-related kidney disease can be very difficult to diagnose unless the patient develops a renal lesion in the setting of known or suspected IgG4-related systemic disease. The urinalysis may show nonnephrotic-range proteinuria and thus many of these patients may not undergo diagnostic renal biopsy. As described later, specific etiologies of chronic tubulointerstitial disease may show additional characteristic findings on renal biopsy. In chronic tubulointerstitial disease, glomeruli may remain remarkably normal by light microscopy, even when marked functional impairment is present. As chronic interstitial injury progresses, glomerular abnormalities become more evident and consist of periglomerular fibrosis, segmental sclerosis and, ultimately, global sclerosis. The cellular infiltrate in chronic tubulointerstitial disease is composed of lymphocytes, macrophages, and B cells, with only occasional neutrophils, plasma cells, and eosinophils. Analgesics implicated in analgesic nephropathy are compound mixtures that contain aspirin or antipyrine in combination with phenacetin, acetaminophen (paracetamol), or salicylamide and caffeine or codeine in over-the-counter proprietary mixtures. Development of analgesic nephropathy likely requires prolonged regular ingestion of combination analgesics (at least 6 tablets daily for >3 years). Despite numerous observational studies, the relative contribution of specific drugs to the development of analgesic nephropathy is not clear and often data on individual components of analgesic combinations do not show nephrotoxicity. Given the concern for renal toxicity, phenacetin has been withdrawn from the market in most countries. Supporting its association with renal toxicity, there was a marked reduction in analgesic nephropathy incidence in those countries, coinciding with this withdrawal. It is also important to note that the risk for analgesic nephropathy with phenacetin occurs solely in compound mixtures and that experimental rat studies of long-term phenacetin monotherapy at therapeutic doses have not demonstrated nephrotoxicity, although chronic supratherapeutic administration has repeatedly been found to produce papillary necrosis. The patients typically give a history of chronic headaches, joint pain, and/ or abdominal pain that prompts regular use of analgesics. An episode of flank pain with or without associated hematuria may indicate a sloughed and potentially obstructing papilla. Because these drugs are available over the counter, many patients may not come to the attention of healthcare professionals until kidney disease has reached an advanced stage. Discontinuation of heavy analgesic use can slow or arrest progression of the renal disease, but reversal of the kidney dysfunction is unlikely. Mechanistically, analgesic components such as acetaminophen can injure cells through lipid peroxidation. If cellular glutathione is depleted, there is the possibility of potentiation of the renal toxicity of acetaminophen, and its reactive metabolites. It has been estimated that a urinary tract malignancy will develop in as many as 8% to 10% of patients with analgesic nephropathy, typically after 15 to 25 years of heavy analgesic use. These criteria include a decreased renal size, bumpy contours, and papillary calcifications. However, a recent meta-analysis of epidemiologic studies has suggested that both classes of drugs are associated with a significant increase in the risk of developing kidney cancer, regardless of the presence of analgesic nephropathy. The number of case reports grew throughout the 1990s to over 120 cases by early 2000. Investigations into the cause of the initial outbreak demonstrated that an herb with no known nephrotoxicity (Stephania tetrandra) had been substituted with A. Renal and urinary abnormalities first appear after residing in an endemic area for at least 15 years. Initial renal abnormalities include tubular dysfunction characterized by tubular proteinuria, glycosuria, aminoaciduria, and impaired acid excretion. On kidney biopsy, there is a hypocellular infiltrate and tubulointerstitial fibrosis that decreases from the outer to inner cortex. Kidneys are of normal size early in the course of the disease, but kidney size diminishes with time. The linkage between heavy metals and nephrotoxicity is strongest for lead and cadmium. Although arsenic and uranium exposure has been hypothesized as nephrotoxins, the data in this regard are weak. Most recently, lead exposures in larger amounts have occurred in contaminated water supplies such as in Flint, Michigan, in 2014. This test is required because blood lead levels only indicate recent, not chronic, lead exposure. Several studies have demonstrated correlations between elevated blood levels and/or body lead burden with the presence of kidney disease and/or accelerated rates of progression of chronic renal disease. Such slow progression has encouraged clinical investigators to examine whether chelation of lead might slow or reverse the progression of this disease. Development of these cysts is likely a direct consequence of lithium uptake by principal cells, because these cysts mainly originate from the distal tubule and collecting duct. Approximately 20% of long-term lithium patients demonstrated slowly rising serum creatinine values, Cadmium accumulates in the body after gastrointestinal absorption or inhalation. Cadmium nephropathy can develop in those with prolonged low-level exposure to excess cadmium, such as with zinc smelter workers, or in the setting of massive environmental contamination, as occurred in Japan in the early part of the 20th century. Uncommonly, such renal damage may progress to an irreversible reduction in glomerular filtration. The extent to which chronic, low-level environmental exposure to cadmium affects renal function is much less clear. The Cadmibel Study recruited over 2000 adults from different areas of Belgium in an attempt to compare the relationships among hypertension, cardiovascular disease, and renal abnormalities with urinary cadmium excretion, a measure of lifetime cadmium exposure. Given the more recent development of additional drugs (olanzapine, quetiapine, lamotrigine) for first-line treatment of bipolar disorder, it is reasonable to use these drugs in patients with an elevated creatinine level, preferably before irreversible interstitial damage has occurred. In general, problems arise following uric acid crystallization in the tubules, collecting system, or outflow tract or the deposition of uric acid within the interstitium, with resulting inflammation. Thus because uric acid in the tubular lumen is concentrated and exposed to a lower pH in the distal nephron, the likelihood of precipitation increases in these distal segments. Uric acid stones are a well-recognized entity and are discussed in Chapter 38: Urinary Stone Disease. Claims in the 1970s that up to 11% of chronic interstitial disease could be attributed to disorders of uric acid metabolism were challenged in the 1980s because of the difficulty in identifying effects of hyperuricemia independent of other risk factors, such as hypertension, vascular disease, kidney stones, or aging. Kidney biopsies reveal tubulointerstitial disease and, in some cases, glomerular ischemia and glomerulosclerosis. Underlying these mechanisms are repeated episodes of dehydration/volume depletion and perhaps episodes of rhabdomyolysis associated with strenuous labor. Further field studies investigating the pathogenesis of this devastating condition are ongoing. Neilson for their chapter in the previous edition of this book, select parts of which have been carried over for this edition. Interstitial nephritis related to nonsteroidal anti-inflammatory agents and beta-lactam antibiotics: a comparative study of the interstitial infiltrates using monoclonal antibodies. Clinical and pathological characterization of Mesoamerican nephropathy: a new kidney disease in Central America. Early steroid treatment improves the recovery of renal function in patients with druginduced acute interstitial nephritis. Analgesic use and the risk of kidney cancer: a meta-analysis of epidemiologic studies. Relationship between renal function and histological changes found in renal biopsy specimens from patients with persistent glomerular nephritis. Quantitative evaluation of interstitial fibrosis with Sirius Red in IgA nephritis. Significance of tubulointerstitial changes in the renal cortex for the excretory function and concentration ability of the kidney: a morphometric contribution. The consequences of tubulointerstitial changes for renal function in glomerulopathies. The proximal tubule is the primary target of injury and progression of kidney disease: role of the glomerulotubular junction. Tubular obstruction leads to progressive proximal tubular injury and atubular glomeruli in polycystic kidney disease. Expression of apoptosisregulatory genes in renal proximal tubular epithelial cells exposed to high ambient glucose and in diabetic kidneys. Tubulointerstitial nephritis antigen: primary structure, expression and role in health and disease. Differential effects of activated human renal epithelial cells on T-cell migration. Pivotal role of Toll-like receptors 2 and 4, its adaptor molecule MyD88, and inflammasome complex in experimental tubule-interstitial nephritis. Activated renal macrophages are markers of disease onset and disease remission in lupus nephritis. Characterization of inflammatory cells in autoimmune tubulointerstitial nephritis in rats. Alternative pathway complement activation induces proinflammatory activity in human proximal tubular epithelial cells. Plasticity, nuclear diapause, and a requiem for the terminal differentiation of epithelia. Epithelial-mesenchymal transition of tubular epithelial cells in human renal biopsies. Mycophenolate mofetil prevents the progressive renal failure induced by 5/6 renal ablation in rats. Abnormal contrasuppression facilitates expression of nephritogenic effector T cells and interstitial nephritis in kdkd mice. Involvement of drug-specific T cells in acute drug-induced interstitial nephritis. Dendiritic cells: not just another cell type in the kidney, but a complex immune sentinel network. Antigen presentation by dendritic cells in renal lymph nodes is linked to systemic and local injury to the kidney. Omeprazole-induced acute interstitial nephritis: a possible Th1-Th17-mediated injury Tracer studies in the rat demonstrate misdirected filtration and peritubular filtrate spreading in nephrons with segmental glomerulosclerosis. Pathways to nephron loss starting from glomerular diseases-insights from animal models. Mechanisms of tubulointerstitial injury in the kidney: final common pathways to end-stage renal failure. Peritubular capillary loss after mouse acute nephrotoxicity correlates with down-regulation of vascular endothelial growth factor-A and hypoxia-inducible factor-1 alpha. Deletion of von Hippel-Lindau protein converts renin-producing cells into erythropoietin-producing cells. A transgenic mouse model for uromodulin-associated kidney diseases shows specific tubulointerstitial damage, urinary concentrating defect and renal failure. Autosomal-dominant medullary cystic kidney disease type 1: clinical and molecular findings in six large Cypriot families. Clinical and molecular characterization of a family with a dominant renin gene mutation and response to treatment with fludrocortisone. Renal biopsy in patients with unexplained renal impairment and normal kidney size. Etiologies and outcome of acute renal insufficiency in older adults: a renal biopsy study of 259 cases. Clinical characteristics, causes and outcomes of acute interstitial nephritis in the elderly.

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