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Biomedical subjects

G A Richard

Publications and source records attributed to G A Richard.

At least 37 records · Page 2Linked to original sources

Total parathyroidectomy and autotransplantation for tertiary hyperparathyroidism in children with chronic renal failure.

An association between chronic renal failure and skeletal deformities in the adolescent patient was first documented by Lucas in 1883. Since then it has been established that the kidneys play a major role in the regulation of calcium, phosphate, and parathyroid hormone, and that chronic renal failure is characterized by profound alterations in the normal metabolic homeostasis of the human body. With the hyperphosphatemia of uremia, compensatory hyperparathyroidism is also a well known complication. Due to these factors, loss of normal renal function ultimately leads to derangement in mineral and bone metabolism resulting in severe skeletal deformities. Reports in the English literature suggest that the changes of renal osteodystrophy are much more pronounced in the pediatric patient, as compared to those in the adult. In the last two decades, renal transplantation has come to be recognized as a satisfactory modality for controlling renal failure and its complications. This procedure is often not available as an option, however, in small patients, especially those under three years of age. The pediatric nephrologist is often forced to manage these patients for long periods with conservative therapy, in an attempt to control the ravages of renal osteodystrophy. The problem becomes unmanageable when the compensatory hyperparathyroidism proceeds to autonomy. When this occurs, despite maintenance of normal serum calcium levels, the renal osteodystrophy progresses rapidly, producing pain, deformities and growth retardation. At this point, the condition is often refractory to medical management and resection of parathyroid tissue remains the only satisfactory modality for control.(ABSTRACT TRUNCATED AT 250 WORDS)

Chronic Kidney Disease-Mineral and Bone Disorder↗

Nephrotic syndrome and diffuse mesangial proliferative glomerulonephritis in children.

The clinical course, response to therapy, and outcome were analyzed in 25 children with nephrotic syndrome associated with moderate to severe mesangial cell proliferation. The conditions of more than two thirds of the patients (16/23) failed to respond to prednisone therapy, and renal insufficiency or failure developed in 13. Our data suggest an association between response to therapy and degree of mesangial cell proliferation. Persistent nephrotic syndrome was associated with slow deterioration of renal function.

Adolescent↗

Serum inhibitor of phytohemagglutinin-induced lymphocyte proliferation in Bartter syndrome.

Serum from four patients with Bartter syndrome inhibited the response to phytohemagglutinin of autologous and homologous (healthy donor) lymphocytes. The abnormal response was normalized in three patients by the administration of indomethacin (2 mg/kg/day), a known inhibitor of prostaglandin synthesis. The serum prostaglandin E2 concentration of these patients before indomethacin therapy was significantly increased (P less than 0.02), as compared with that in controls. The serum PGE2 concentration measured in two of three patients undergoing indomethacin therapy was normal. Because PGE2 is known to inhibit the response of lymphocytes to phytohemagglutinin, we postulate that PGE2 may mediate the reduced blastogenic response observed in patients with Bartter syndrome.

Bartter Syndrome↗

Treatment of urinary tract infections with varying regimens of sulfisoxazole.

Four therapeutic regimens of sulfisoxazole were compared and contrasted with the antibody-coated bacteria test in patients with acute urinary tract infections. Of 158 college coeds who entered the study 146 completed the randomly assigned regimen. All 146 patients received 2 gm. sulfisoxazole initially and 1 gm. 4 times daily for 3 days in 44 patients (group 1), 7 days in 51 (group 2), 14 days in 29 (group 3) and 21 days in 22 (group 4). The presumptive sites of infection by the antibody-coated bacteria test were kidney (positive test) in 43 per cent of the patients and bladder (negative test) in 51.3 per cent. There was no correlation between the results of the antibody-coated bacteria test with either the presenting symptoms or the therapeutic responses. The bacteriologic cure rates at 2 days after therapy were 100 per cent in all groups and at 4 weeks after therapy they were 88.6 per cent in group 1, 86.3 per cent in group 2, 86.2 per cent in group 3 and 91 per cent in group 4. A 3-day course of sulfisoxazole was as effective as the longer regimens.

Adolescent↗

Renal growth and scarring in kidneys with reflux and a concentrating defect.

A study was done to determine if kidneys with reflux and an associated renal concentrating defect grew less well and had more scars than kidneys with reflux but no renal concentrating defect. To test our hypothesis we measured renal growth and assessed radiographs for renal scars in 11 children with and 20 children without a renal concentrating defect. Kidneys with reflux and a renal concentrating defect grew less well and had more scars than those kidneys with reflux but no renal concentrating defect. A persistent renal concentrating defect may be a predictor of kidneys more likely to have impaired growth and renal scars.

Child↗

Impaired primary antibody response in experimental nephrotic syndrome.

The primary antibody response to sheep red blood cells (SRBC) is reduced in rats with aminonucleoside of puromycin (AP) nephrosis, as measured by haemagglutination and IgM antibody forming spleen cells (AFC). Since rats immunized 1 day after AP administration had a normal antibody response, these studies suggest that the impaired immune response in nephrotic rats is not due to a direct effect of AP but that it is secondary to the nephrotic state.

Animals↗

Hyperparathyroidism and anemia in chronic renal failure.

The clinical course of an adolescent on chronic hemodialysis with severe hyperparathyroidism, osteodystrophy and profound anemia is described. After 1,25,dihydroxycholecalciferol was instituted for therapy, bone disease improved as evidenced by radiographic findings. Transfusion requirements diminished and bone marrow fibrosis on serial biopsies decreased significantly. These therapeutic results link hyperparathyroidism with the pathogenesis of anemia in chronic renal failure.

Anemia↗

Compensatory renal growth and function in postnephrectomized patients with Wilms tumor.

The objective of this study was to determine whether or not renal growth and function were adversely affected in the remaining kidneys of patients who had undergone nephrectomy for Wilms tumor. These patients received chemotherapy and some radiotherapy (tumoricidal agents which might affect the remaining kidney). Renal growth was compared between the treatment groups and normal renal growth. Hypertrophy did occur and did not appear to be affected by subsequent treatment. Renal function was minimally altered in all treatment groups irrespective of the type of treatment.

Adaptation, Physiological↗

Treatment of urinary tract infections with a combination of amoxicillin and clavulanic acid.

A 10-day course of amoxicillin (250 mg)-potassium clavulanate (125 mg) was administered three times daily to 116 female college students with urinary tract infections. All of the bacterial isolates from these patients were susceptible to amoxicillin-potassium clavulanate in vitro; only 81.0% were susceptible to amoxicillin alone. Evaluations at 1 week after completion of this course showed that clinical and bacteriological cures had been achieved in 96.9% of those who completed therapy. Cures were sustained in 85.6% of the patients examined at 4 weeks after the end of therapy. Therapeutic responses were comparable, irrespective of the results of antibody-coated bacteria tests. All strains of Enterobacteriaceae isolated from the rectal and urogenital sites at 1 week after therapy were susceptible to amoxicillin-potassium clavulanate. The proportion of fecal Escherichia coli resistant to amoxicillin alone increased from 13.3% before therapy to 35.6% at 1 week after therapy. Adverse drug reactions consisted of gastrointestinal symptoms (9.8%) and rashes (4.1%). Sixteen patients (14.2%) developed symptomatic candida vaginitis by 1 week after therapy.

Amoxicillin↗

Osteonecrosis of the femoral head and condyle in the post transplantation courses of children and adolescents.

The clinical courses of 29 children and adolescents who received their first renal allografts at the University of Florida from 1973 to 1979 were reviewed for the development of osteonecrosis. A minimum follow-up period of 24 months with adequate allograft function was required for inclusion in the study. The incidence of post transplantation osteonecrosis was 21%. The presence of osteodystrophy prior to transplant was strongly correlated with osteonecrosis. Dialysis against high calcium baths prior to transplantation played a protective role. Extensive reviews of their records failed to clearly identify other predisposing factors. Osteonecrosis of the knee was treated with plaster immobilization and osteonecrosis of the femoral head by resection arthroplasty and angulation osteotomy. Improved functional results were obtained on the Iowa Hip Rating Scales.

Adolescent↗

Treatment of acute uncomplicated urinary tract infections by cephalexin, with special reference to the antibody-coated bacteria.

In 68 college-age females with acute uncomplicated urinary tract infections (UTI), ACB testing revealed that 36.8% of the infections were localized in the kidney and 63.2% in the urinary bladder. Sixty-two patients who completed 10 days of therapy with cephalexin showed a clinical and bacteriologic cure on the last day of therapy. Ninety-seven percent of patients were free of UTI at 1 week post therapy. Cephalexin appeared to be equally effective in treatment of both ACB-positive and ACB-negative infections. Antibody-coated bacteria did not correlate with symptoms, response to therapy, or rate of recurrences.

Adult↗

Comparative efficacy and safety of nalidixic acid versus trimethoprim/sulfamethoxazole in treatment of acute urinary tract infections in college-age women.

One hundred and thirty-five college-age women with acute urinary tract infections caused by gram-negative Enterobacteriaceae were treated by random allocation with either nalidixic acid (NA), 1 g every 6 h for 7 days, or trimethoprim/sulfamethoxazole (TMP/SMZ), 160/800 mg every 12 h for 10 days. The clinical and bacteriological cure rates were 98.0% in each group on the last day of therapy. At 1 and 4 week posttherapy, both the clinical and bacteriological cure rates for NA declined to 90.0 and 74.0% respectively; for TMP/SMZ, they declined to 93.0 and 72.0% respectively. By 4 weeks posttherapy, 96.0% of the TMP/SMZ group and 93.0% of the NA group had remained free of the initial urinary pathogens. Neither drug was associated with emergence of resistant bacterial mutants in urine. The antibody-coated bacteria tested (ACBT) localized 31.5% of the infections of the kidney and 67.7% to the bladder. Upper tract symptoms did not correlate with the presence of a positive ACBT. The response to therapy was similar for the two regimens regardless of ACBT results. After treatment, the emergence of resistant Enterobacteriaceae in fecal flora was 1.1% in the NA group and 2.3% in the TMP/SMZ group. The incidences of drug reactions were 7.0% with NA and 6.3% and TMP/SMZ.

Adult↗

Treatment of uncomplicated urinary tract infections with trimethoprim versus sulfisoxazole, with special reference to antibody-coated bacteria and fecal flora.

A total of 331 college-age women with urinary tract infections were studied. These women were assigned randomly to the following groups: 50 patients treated with 400 mg of trimethoprim (TMP) per day for 14 days (designated the TMP400/14d group); 50 treated with 2.0 g of sulfisoxazole (SZ) per day for 14 days (SZ/14d group); 120 treated with 200 mg of TMP per day for 10 days (TMP200/10d group); and 111 treated with 2.0 g of SZ per day for 10 days (SZ/10d group). By the last day of therapy, clinical and bacteriological cure rates were 100% in the TMP400/14d, SZ/14d, and TMP200/10d groups and 97.1% in SZ/10d group. At 1 week after therapy ended, the initial urinary pathogens remained eradicated in 100% of the TMP400/14d group, 98.2% of the TMP200/10d group, 95.6% of the SZ/14d group, and 98.0% of the SZ/10d group at 4 weeks after therapy ended, the clinical cure rates were 92.0% in the TMP400/14d group, 92.0% in the SZ/14d group, 89.0% in the TMP200/10d group, and 90.0% in the SZ/10d group. At 4 and 24 weeks after therapy ended, the recurrence rates in the four treatment groups did not differ significantly. The antibody-coated bacteria test localized 39.5% of the infections to kidneys and 56.8% of the infections to bladders. Neither symptoms nor responses to therapy were correlated with the antibody-coated bacteria test results. Both TMP at a dose of 200 mg/day and SZ were tolerated well. TMP at a dose of 400 mg/day was associated with a skin rash in 24% of the patients receiving this therapy. TMP suppressed fecal Escherichia coli. SZ increased the number of sulfa-resistant fecal isolates; however, this phenomenon did not affect the rate of sulfa-resistant recurrences.

Adolescent↗

Liver dysfunction in children and adolescents during hemodialysis and after renal transplantation.

Liver dysfunction is common in patients on hemodialysis or during the posttransplant period. Twelve children in the End-Stage Renal Disease Program at the University of Florida ranging in age from 4 to 18 years, developed persistent, elevated liver enzymes (SGOT or SGPT greater than 100 IU/liter) during hemodialysis in preparation for renal transplantation. Eleven of 12 developed enzyme elevations within six weeks of the initiation of hemodialysis. The other child exhibited enzyme elevations after one year on dialysis while awaiting a second transplant. Most of the children were anicteric and asymptomatic. Potential hepatotoxic drugs were discontinued when serum transaminase elevations were noted. Hepatitis B surface antigenemia was associated with enzyme elevations in one patient; cytomegalovirus seroconversion had occurred in eight patients, but only three had associated enzyme elevations. Liver biopsies were performed in all the patients before or at the time of renal transplantation. The histology was variable and ranged from normal in six patients, mildly abnormal with changes compatible with acute hepatitis in four patients, and granulomatous hepatitis in one patient, to severely abnormal with chronic hepatitis inthe remaining patient. Seven of the 12 children underwent successful transplantation with return of enzyme levels to normal in five and persistent elevations in the others. These findings suggest that evaluation of liver histology provides the only accurate means of assessment of persistent liver dysfunction in children and adolescents on hemodialysis and after renal transplantation.

Adolescent↗

Systemic lupus erythematosus glomerulonephritis in children.

This paper reviews the four types of systemic lupus erythematosus (SLE) glomerulonephritis in children and presents the clinical and renal histologic findings. A therapeutic program based upon the hypothesis that the nephritis of SLE is the result of the glomerular deposition of pathogenic dsDNA-anti-ds/DNA immune complexes is outlined. The effectiveness of therapy in suppressing disease activity is best estimated by serial determinations of serum complement components, particularly C3, and secondarily by monitoring serum levels of antibody to native DNA.

Animals↗