deamino-arginine-vasopressin and Urinary-Tract-Infections

We analysed a large sample of children diagnosed with urinary tract malformations and/or infections and calculated diagnostic efficiency and quality indexes for five different functional markers, with the goal of testing which is the most sensitive for detecting a loss of renal parenchyma.. Ours was a cross-sectional retrospective study in which the clinical histories of 179 paediatric patients (91 male and 88 female) were evaluated. In 102 of these patients (57%), a scintigraphy revealed loss of parenchyma. The most commonly observed morphological type of damage was renal scarring. All patients had undergone at least one desmopressin urine concentration test. We also analysed albumin/creatinine and N-acetyl-glucosaminidase (NAG)/creatinine ratios, glomerular filtration rate (GFR), and urine volume.. By distributing patients according to normal/abnormal scintigraphy, we observed statistically significant differences between the two groups in maximum urine osmolality and GFR. Urine volume was elevated in 31.3% of cases (sensitivity: 37.9%; specificity: 81.8%) and 24% had a defect in renal concentrating ability (sensitivity: 30.4%; specificity: 84.8%). Urinary albumin excretion was high in 12.2% of patients, and 7.2% had a high NAG/creatinine ratio. GFR was low in only 5.7% of patients. These last two markers were the least sensitive but most specific for detecting a loss of renal parenchyma (100%).. In our study, the most sensitive functional tests for detecting the loss of renal parenchyma were the two that take into account the ability of the kidney to manage water, i.e. urine volume and maximum urine osmolality. These two tests had specificity >80%. However, the maximum specificity was obtained by the NAG/creatinine ratio and GFR, which were, conversely, the least sensitive tests. A normal GFR does not necessarily show normal renal function.

Topics: Acetylglucosaminidase; Adolescent; Albuminuria; Atrophy; Biomarkers; Child; Child, Preschool; Creatinine; Cross-Sectional Studies; Deamino Arginine Vasopressin; Female; Glomerular Filtration Rate; Humans; Infant; Kidney; Kidney Concentrating Ability; Male; Osmolar Concentration; Radionuclide Imaging; Retrospective Studies; Sensitivity and Specificity; Urinary Tract Infections; Urogenital Abnormalities; Vesico-Ureteral Reflux

Lower urinary tract dysfunction in multiple sclerosis is common and is highly amenable to treatment. Individuals may have bladder storage and/or voiding dysfunction. The risk of progression to renal failure is low and hence lower urinary tract dysfunction should be considered medically manageable in most individuals. Evaluation begins with history taking and is supplemented by using a bladder diary. Ultrasonography is used to assess the degree of incomplete bladder emptying, and for assessing upper urinary tract damage. Incomplete bladder emptying is most often managed by clean intermittent self-catheterization and should be initiated if post-void residual urine is greater than 100 mls. Storage symptoms are most often managed using antimuscarinic medications. Other options include desmopressin or detrusor muscle injection of botulinum toxin type A. There are specific situations where specialist urology services should be involved.

Topics: Algorithms; Antidiuretic Agents; Botulinum Toxins, Type A; Community Health Nursing; Deamino Arginine Vasopressin; Humans; Multiple Sclerosis; Muscarinic Antagonists; Neuromuscular Agents; Nursing Assessment; Referral and Consultation; Risk Factors; Self Care; Urinary Bladder, Overactive; Urinary Catheterization; Urinary Tract Infections; Urination Disorders; Urodynamics

Renal concentrating capacity (RCC) has been used as a tool in the diagnosis of the site of urinary tract infection (UTI). In this study, RCC was measured in women with symptoms of UTI in relation to the clinical picture and the bacterial species isolated.. In 633 outpatients aged > or =18 years with symptoms of UTI, a renal concentration test with desmopressin was performed at baseline. The test was repeated after antibiotic treatment in a subset of patients with osmolality values below the reference levels at entry. The bacterial species were identified and patients were classified as having either pyelonephritis or cystitis.. RCC was reduced in patients infected with Escherichia coli or Staphylococcus saprophyticus compared to those who had negative urine cultures and increased after antibiotic treatment. Patients with symptoms of both pyelonephritis and cystitis had reduced RCC: 44/68 (65%) and 205/457 (45%), respectively.. These findings demonstrate a considerable overlap in RCC between patients with pyelonephritis and cystitis, making the osmolality test unreliable for the purpose of diagnosis of the site of UTI.

Topics: Adolescent; Adult; Aged; Aged, 80 and over; Anti-Bacterial Agents; Antidiuretic Agents; Deamino Arginine Vasopressin; Female; Follow-Up Studies; Humans; Kidney Concentrating Ability; Middle Aged; Osmolar Concentration; Outpatients; Urinary Tract Infections

Voiding problems, and in particular nocturnal enuresis, can usually be evaluated and managed without resorting to complex procedures or invasive tests. A good history with attention to toilet habits and the possible presence of infection can help distinguish patients who may have significant organic pathologic conditions who require further investigation. Wetting alarms are effective with a low recidivism rate but are noisy. DDAVP is effective, works rapidly, and is discrete but has a higher recidivism rate. Treatment is aimed at correcting any poor toilet habits and using the appropriate alarm device or medication.

Topics: Behavior Therapy; Child; Deamino Arginine Vasopressin; Enuresis; Humans; Renal Agents; Urinary Bladder, Neurogenic; Urinary Tract Infections; Urination Disorders; Urodynamics

A total of 106 children with symptomatic urinary tract infection (73 girls and 33 boys, 0-15.9 years of age) were studied by means of a dimercaptosuccinic acid (DMSA) scan, renal ultrasound, and a desmopressin test during infection and at follow up approximately two months later. At follow up they were also investigated by means of intravenous urography (IVU) and micturition cystourethrography (MCU). During infection 23 children had a normal DMSA scan while 83 children had an abnormal one. The median C reactive protein and SD score for renal concentration capacity in the former group were 15 (range < 10-178) mg/l and -1.0 SD score (range -2.4 to 1.8), respectively, and in the latter group 98 (range < 10-320) mg/l and -3.1 SD score (range -5.7 to 1.1), respectively. In the former group there was no significant finding in any child on ultrasound or IVU and only one had significant vesicoureteric reflux (VUR) (grade 3). At follow up 51 children had a normal DMSA scan while 55 children showed persistent changes. The median SD score for renal concentration capacity in the former group was -0.9 SD score (range -3.2 to 1.4) and in the latter group -1.6 SD score (range -4.6 to 2.5). No significant changes were found in the former group on ultrasound or IVU and only two children had significant VUR (grade 3). In the latter group 20 children showed changes on ultrasound, 15 showed changes on IVU, and 23 had VUR. These results suggest that a normal DMSA scan during or approximately two months after urinary tract infection in children indicates a low risk of finding significant pathology of the urinary tract.

Topics: Adolescent; Child; Child, Preschool; Deamino Arginine Vasopressin; Female; Follow-Up Studies; Humans; Infant; Male; Organotechnetium Compounds; Radionuclide Imaging; Succimer; Technetium Tc 99m Dimercaptosuccinic Acid; Ultrasonography; Urinary Tract; Urinary Tract Infections; Urography

The maximal urine concentration capacity was studied in patients with acute pyelonephritis and in patients with clinically diagnosed acute cystitis. In the former group renal concentration ability was reduced in 16 of 22 patients and improved in all but two patients. Among patients with symptoms of acute cystitis 6 of 22 had a concentration capacity below 2 SD of normal values. Several of these patients had raised acute phase proteins and increased their urine osmolality at follow-up indicating that cases of acute pyelonephritis could have been included. It is concluded that the wide overlap between the groups makes the maximal urinary concentration capacity a method of limited value for level diagnosis in acute UTI infection. The test should be reserved for follow-up to reveal permanent renal damage.

Topics: Acute Disease; Adolescent; Adult; Aged; Bacteriuria; Cystitis; Deamino Arginine Vasopressin; Female; Humans; Kidney Concentrating Ability; Kidney Tubules, Distal; Male; Middle Aged; Osmolar Concentration; Pyelonephritis; Urinary Tract Infections

Intranasal administration of DDAVP (1-deamino-8-D-arginine vasopressin), a synthetic analogue of vasopressin, followed by measurement of urine osmolaity 6 h afterwards, represents a convenient, reliable and simple method for the estimation of renal concentrating capacity in children. The DDAVP-test is as accurate and reproducible as the water deprivation test, irrespective of the degree of concentrating capacity. Mean urine osmolality after DDAVP in children without renal disease was found to be 984 +/- 218 mosmol/kg water (m +/- 2 SD). In children with recurrent pyelonephritis, urine osmolality after DDAVP was decreased. The values were significantly lower with bilateral changes than with unilateral changes of chronic pyelonephritis in the i.v. urograms. In chronic pyelonephritis the concentrating capacity appears to be earlier impaired than other parameters of renal function.

Topics: Adolescent; Arginine Vasopressin; Child; Child, Preschool; Chronic Disease; Deamino Arginine Vasopressin; Humans; Infant; Kidney Concentrating Ability; Osmolar Concentration; Pyelonephritis; Time Factors; Urinary Tract Infections; Urine