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Biomedical subjects

S K Aggarwal

Publications and source records attributed to S K Aggarwal.

At least 73 records · Page 4Linked to original sources
PubMed1990

Glycine, glycyl-glycine and maltodextrin based oral rehydration solution. Assessment of efficacy and safety in comparison to standard ORS.

We evaluated the efficacy and safety of an oral rehydration solution containing glycyl-glycine, glycine, and maltodextrin (GGG-ORS), in comparison to the glucose based ORS (standard ORS). The osmolality of the GGG-ORS (305 mOsm/l) and standard ORS (311 mOsm/l) was similar. Ninety-two children presenting with acute gastroenteritis and moderate dehydration, aged 3 months to 3 years, were randomly assigned to receive standard ORS or GGG-ORS. All the patients were successfully rehydrated orally. The two groups were comparable for baseline characteristics including the microbial etiology. Rotavirus (49%, 36%), ETEC (11%, 18%) or a combination of rotavirus and ETEC (15%, 9%) were the main stool pathogens isolated. There was no significant difference in the mean stool output or duration of diarrhoea between the two groups. Patients in the GGG-ORS group had higher urine output (p less than 0.01) and weight gain (p less than 0.05) in the initial 6 hours when feeding was withheld, but no such differences were observed beyond this period. Hypernatremia did not develop in any patient during the study. We conclude that glycine and glycyl-glycine supplemented oral rehydration solution does not have any therapeutic advantage in the treatment of acute gastroenteritis with moderate dehydration caused predominantly by rotavirus.

Acute Disease↗
PubMed1990

Immunocytochemical demonstration of vasopressin binding in rat kidney.

We investigated the immunoperoxidase demonstration of vasopressin (VSP) bound to paraffin-embedded sections of rat kidney and the effects of various fixatives. Slices of rat kidney from normal and 4-day water-deprived rats were incubated with 10(-7) M VSP, fixed, and embedded in paraffin. Hydrated sections of these tissues were again incubated with 10(-7) M VSP or 10(-7) M VSP and 10(-5) M oxytocin (OXY). VSP bound to the sections was demonstrated using rabbit anti-Arg8 VSP antiserum and peroxidase-labeled second antibody. In sections of kidney from both normal and water-deprived rats, immunoperoxidase labeling was most intense in the renal papilla and was restricted to the cells of the ducts of Bellini and loops of Henle. In the medulla, the collecting ducts and medullary thick ascending limbs of Henle were moderately stained. In the normal kidney sections there was no staining of the proximal tubules, distal convoluted tubules (DCT), and only slight staining of the cortical collecting ducts (CCD). However, in the water-deprived rats there was a considerable increase in the staining of the DCT and CCD. Simultaneous incubation in OXY and VSP resulted in reduced immunoperoxidase labeling of the tubules. Omission of VSP incubation led to a similar decrease in stain intensity, indicating a specificity for the sites of VSP binding. This technique allows the identification of cells responsible for the binding of VSP in the kidney.

Animals↗
PubMed1989

Isotope dilution gas chromatography/mass spectrometry for the determination of nickel in biological materials.

Precise and accurate methods are required to measure nickel in urine and serum samples to identify clinical states of either deficiency or toxicity. This paper presents an isotope dilution gas chromatography/mass spectrometry method for the measurement of nickel in biological samples. The method involves the preparation of a thermally stable and volatile nickel chelate using lithium bis(trifluoroethyl)dithiocarbamate as the chelating agent. Conditions were optimized for the digestion of the sample and quantitative preparation of chelate as well as the precise and accurate measurements of the isotope ratios using a capillary column gas chromatograph with a general purpose mass spectrometer. The memory effect between samples of different isotope ratios was evaluated and was found to be negligible. The quantitative accuracy of isotope dilution was validated by measuring nickel in the NIST freeze-dried urine reference material, SRM 2670, with comparison to the recommended value.

Chelating Agents↗
PubMed1989

A pro-drug of zidovudine with enhanced efficacy against human immunodeficiency virus.

In an attempt to alleviate the drug-related toxicity of zidovudine in patients with AIDS, a pro-drug of zidovudine, 5'-[(1,4-dihydro-1-methyl-3-pyridinylcarbonyl)oxy]-3'-azido-2',3'- dideoxythymidine (DP-AZT), has been evaluated. Cellular uptake by H9 cells and peripheral blood lymphocytes (PBL) with zidovudine and DP-AZT showed at least a 50% greater intracellular concentration of DP-AZT within 2 hr. DP-AZT was significantly less toxic to murine bone marrow cells as measured by CFU-E assay. The ED50 concentration to inhibit the production of HIV specific p24 antigen was 0.05 microM for DP-AZT whereas zidovudine required 0.125 microM. These results demonstrated that DP-AZT has a higher therapeutic ratio than zidovudine as an anti-HIV-1 agent.

Animals↗
PubMed1989

Drug eruptions (a series of 148 cases).

A total number of 148 patients, comprising of 101 males and 47 females diagnosed as drug eruptions were reviewed. The youngest patient was eight and the oldest 73 years. The mean age was 34 years. 75(50.7%) patients were in the age group of 20 to 40 years. In 88(59.5%) pruritus was the chief associated symptom. 116(78.4%) developed eruptions within 2 weeks. 29(19.6%) had single site involvement, 92(62.2%) had lesions at more than one site and 25(16.9%) patients had generalised skin and mucous membrane involvement. The commonest skin reactions were fixed drug eruptions in 39(26.4%) cases. Almost all types of drug eruptions were observed. The eruptions were caused by 37 different drugs, the commonest being sulphonamides in 28(18.9%) cases. Systemic side effects were recorded in 13(8.8%) patients. 76(51.4%) were treated with topical medicaments. Out of the remaining, 33(22.3%) were managed by antihistamines and 26(17.6%) by steroids in addition to topical therapy. No treatment was required in 13(8.8%). 117(79.1%) were treated as out patients and 31(20.9%) were hospitalised. One (0.7%) patient died of toxic epidermal necrolysis due to penicillamine.

Adult↗
PubMed1989

Analysis of dermatological referrals (a series of 662 cases from base and army hospital complex).

An analysis of 662 patients from non-dermatological wards and specialist out-patients referred for dermatological opinion is reported. There was a high proportion of referrals of 330 (49 8%) cases from internal medicine and allied specialties, followed by 150 (22.7%) from surgical disciplines, 65 (9.8%) by Paediatricians 30 (4.5%) by Otolaryngologists, 24 (3.6%) each by Ophthalmologists and specialists in Obstetrics and Gynaecology, 21 (3 2%) by dental surgeons and 18 (2.7%) from department of Psychiatry. The youngest patient was a new born and the oldest 87 years. 333 (50.3%) were in the age group of 21 to 40 years. 505 (76.3%) were males. Almost one fourth i.e. 152 (23%) presented with cutaneous manifestations of underlying diseases, another 82 (12.4%) were drug eruptions and other complications of treatment. The study emphasizes considerable interphase between cutaneous and systemic diseases and the need for close co-operation between dermatology and other specialist medical disciplines.

Adolescent↗
PubMed1988

Paucibacillary leprosy: a comparative study of different schedules of multidrug therapy.

The study was undertaken to evaluate the efficacy of various multidrug regimens (MDT). Three groups of 10 cases each of Paucibacillary cases were given different schedule of multidrug therapy. First group (T-0) was administered modified WHO regimen consisting of Rifampicin 600 mg once a month, Clofazimine 100 mg alternate days and Dapsone 100 mg daily for 6 months. In second group (T-1) Rifampicin 600 mg was given daily for 6 weeks and in third group (T-2) Rifampicin 600 mg was given daily for 6 months. In both the latter groups Clofazimine 100 mg on alternate days and Dapsone 100 mg daily was also administered for 6 months. Objective clinical scoring was done at the time of admission, three months and six months after treatment in all three groups. The best results were obtained by T-2 followed by T-1; and least effective was T-0 regimen. Pinkish colour of urine and skin was observed in 26 cases and icthyosis in all the cases. All the patients remain under treatment. The work is in progress and subsequent results will be published later.

Adult↗
PubMed1987

Moustachology.

Explore the source record for details and available documents.

Hair↗
PubMed1986

An in vitro screening system for the nephrotoxicity of various platinum coordination complexes. A cytochemical study.

Isolated rat kidney tubules were cultured in Earle's medium with and without the platinum coordination complexes. Aliquots were taken at 0, 1, 2, 3, 4, 5, 6, and 8 h and analyzed for the amount of Na+/K+-ATPase, Ca2+-ATPase, alkaline phosphatase, and acid phosphatase. Culture medium was also analyzed biochemically for the amounts of alkaline phosphatase present. There is a decrease in the various enzymes levels of the tubules after incubation in nephrotoxic analogues with a corresponding increase in the culture medium. These results compare favorably with in vivo studies. The alkaline phosphatase monitored in the rat kidney cross sections from both the normal and the drug-treated animals at 0, 3, 5, 10, and 20 days showed a correlation in the decrease of enzyme levels in the kidney with a corresponding increase in the urinary levels in both the Wistar and the Long Evans rats. The baseline levels were higher in the Long Evans rats than in the Wistar rats. After cisplatin (nephrotoxic) treatment the Long Evans rats had twice as much alkaline phosphatase in the urine at day 5 as the Wistar rats. Rats treated with cyclobutanedicarboxylatoplatinum (II) did have some alkaline phosphatase output in the urine in excess of the normal levels, but this increase was not so highly significant as to justify classifying the drug as nephrotoxic.

Acid Phosphatase↗
PubMed1985

An analysis of factors responsible for resorption of embryos in cisplatin-treated rats.

Pregnant rats were injected ip with 4 or 7 mg cisplatin/kg on gestation day (gd) 6 to study its effect on embryonal resorption. Serum concentrations of prolactin, luteinizing hormone (LH), and progesterone were determined by radioimmunoassay in pregnant rats, and related to the effects of cisplatin on the maintenance of pregnancy. The nocturnal prolactin surge on gd 9 was abolished in cisplatin-treated rats. Within 3 days after drug injection, LH concentrations decreased 39%, while serum progesterone decreased 63% by Day 10. A histochemical study of 20 alpha-hydroxysteroid dehydrogenase activity revealed no enzyme activity by gd 10. It is proposed that the cause of cisplatin-related embryonal resorption in rats may be due to decreases in hormone concentrations observed after drug treatment.

20-Hydroxysteroid Dehydrogenases↗
PubMed1985

Glutathione peroxidase activity and reduced glutathione content in erythrocytes of patients with chronic renal failure.

Erythrocytes from 18 patients with chronic renal failure (CRF) and 10 healthy subjects were examined with respect to glutathione peroxidase (GSH-Px) activity and reduced glutathione (GSH) contents. The activity of GSH-Px and GSH content were found to be lower in RBC from CRF patients as compared with normal RBC. These reduced levels of GSH and GSH-Px in the red cells of uraemic patients may predispose the cells to oxidative damage.

Adult↗