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Biomedical subjects

S Vannasaeng

Publications and source records attributed to S Vannasaeng.

At least 19 recordsLinked to original sources
PubMed1992

Presence of autoimmunity to pancreatic antigens in a patient with fibrocalculous pancreatic diabetes.

A case of fibrocalculous pancreatic diabetes (FCPD) is reported for which antibody and cellular immune characteristics were determined. The patient, a Thai woman, had serum islet cell antibodies (ICA) that were detected by both immunoperoxidase staining and an indirect enzyme-linked immunosorbent assay (ELISA). Serum anti-human insulin antibodies were negative by a displacement ELISA. Lymphoproliferation assay against pancreatic antigen prepared from a blood group O cadaveric donor was positive. Increased CD8+ lymphocytes were observed using direct immunofluorescence staining and flow cytometry. CD4+ T lymphocytes, B lymphocytes and NK cells were within normal levels. These findings provide evidence for autoimmunity to pancreatic antigens in a patient with fibrocalculous pancreatic diabetes.

Adult↗
PubMed1992

The epidemiology of insulin-dependent diabetes mellitus (IDDM): report from Thailand.

The epidemiology of diabetes mellitus in Thai children aged 0-15 years was studied in 1985 and compared with a previous study done in 1984. Four hundred and seventy-six questionnaires were sent each year to hospitals in Thailand. In 1984, thirty-six cases of newly diagnosed diabetes mellitus were found of which 35 were IDDM and one was NIDDM. In 1985, twenty-seven cases of new IDDM were found, no case of NIDDM was reported. Two cases of MRD were reported from the Northeastern and Southern part of Thailand. The incidence of IDDM in the whole kingdom of Thailand was 0.19/100,000/year in 1984 and 0.14/100,000/year in 1985. The male to female ratio was 1:1.5 in 1984 and 1:2 in 1985. The peak age at diagnosis showed the main peak at 14 years old in boys. The peak age of girls preceded boys by 1-2 years in 1984 and 1985. Similar findings in 1984 and 1985 were the onset of symptoms showing a seasonal variation with highest frequency in winter with a slight change of increased incidence in the rainy season of 1985. There was an increased incidence of IDDM in families with lower educational and socioeconomic levels. The newly diagnosed IDDM with DKA was 16.2, and 19.5 per cent in 1984 and 1985. The incidence of IDDM in Thai children, aged 0-15 years seems to be the lowest compared to other countries previously described which might be due to some genetic and environmental including diet, micronutrient, eating habits and life-style which might play a role in the difference.

Adolescent↗
PubMed1991

Incidence of aplastic anemia in Bangkok. The Aplastic Anemia Study Group.

The annual incidence of aplastic anemia in metropolitan Bangkok, Thailand, and its five suburban provinces was prospectively determined. All patients first diagnosed during the period from January through December 1989 who met specific clinical and pathologic criteria were included. Thirty-two cases were identified, yielding an overall incidence of 3.7 per million. The incidence rates for the age groups 0 through 24, 25 through 59, and over 60 years were 4.3, 3.2, and 2.1 per million, respectively; the highest rate, 7.2 per million, was found for individuals aged 15 to 24 years. The male-to-female ratio was 1.9. The incidence of aplastic anemia in Bangkok is higher than that reported in recent European studies. The peak rate in young persons is almost fourfold higher than in comparable recent western studies and suggests an environmental etiology peculiar to Thailand.

Adolescent↗
PubMed1991

Pituitary function in thalassemic patients and the effect of chelation therapy.

This study examined anterior pituitary function and the effect of chelation therapy in 31 patients with beta-thalassemia/HbE disease. Patients were divided into those receiving chelation therapy by deferoxamine and those receiving no such therapy (control group). Pituitary function studies were repeated in both groups 18 months later. The results showed decreased pituitary responses following stimulation in 22 patients. Among these, gonadotropin and PRL responses were most affected. After 18 months, serum ferritin levels had significantly decreased in the deferoxamine group. PRL and GH responses were improved in 3 patients receiving chelation therapy without changes in other hormone responses. In contrast, no changes in pituitary responses were shown in the control group at the end of follow-up. There were 6 drop-outs (4 in the control and 2 in the deferoxamine group) and 3 deaths (2 in the control and 1 in the deferoxamine group) during 18 months. In conclusion, gonadotropin and PRL deficiencies occur most frequently in thalassemic patients. Chelation therapy for 18 months markedly reduced serum ferritin level and might preserve or improve PRL and GH secretions, but seems to have no beneficial effects on other pituitary hormone reserves.

Adult↗
PubMed1990

Sertoli-cell-only syndrome: a case report.

A 20-year-old male presented with a small hydrocoele in the left scrotal sac, bilateral small testes, and azoospermia with normal secondary sexual characteristics. Chromosome study revealed 46,XY. The results of hormonal and histopathological studies were consistent with Sertoli-cell-only syndrome.

Adult↗
PubMed1990

Complete heart block complicating hyperthyroidism: a case report.

Complete heart block developed in a 29-year-old man with hyperthyroidism and acute febrile illness. The definite cause of acute febrile illness was unknown. The results of bacteriological and viral studies were negative. Endomyocardial biopsy revealed no evidence of carditis which is the common cause of heart block. All the abnormalities resolved completely after the fever subsided and the patient was treated with an antithyroid drug. Available information indicates that a high degree of heart block can sometimes occur in hyperthyroidism in either the presence or absence of additional factors which can independently impair atrioventricular conduction. This course of events which occurred in this patient suggest that complete heartblock may have been the direct manifestation of the hyperthyroid state, however, the acute febrile illness may have been an aggravating factor in the development of abnormal atrioventricular conduction.

Adult↗
PubMed1989

Glucose intolerance, hyperinsulinemia and insulin resistance in aplastic anemia.

Oral glucose tolerance tests were conducted in 29 patients with aplastic anemia and 20 nondiabetic controls. Seventeen were men and 12 were women, ranging in age from 15 to 67 years. Based on the results of oral glucose tolerance test, the patients were divided into three groups: 14 previously treated cases with normal glucose tolerance; eight previously treated cases with abnormal glucose tolerance, of whom six had diabetes and two had impaired glucose tolerance; and seven newly diagnosed cases with normal glucose tolerance. Hyperinsulinemia and insulin resistance were observed in all patients. Multivariate analyses show that sex, age, body mass index, previous androgen and corticosteroid therapy, previous blood transfusion, initial hemoglobin and white blood cell and serum ferritin concentrations were not significantly related to hyperinsulinemia as expressed by the integrated insulin area under the curve of glucose tolerance test. Patients in the second group who had abnormal glucose tolerance had a delay in insulin secretion in response to glucose, indicating a deterioration of insulin reserve in the beta cells. Patients in this group were significantly older at the time of diagnosis than those in the first group. No other determinants of the development of abnormal glucose tolerance were demonstrated.

Adolescent↗
PubMed1988

Case-control study on risk factors associated with fibrocalculous pancreatic diabetes.

We investigated the relation between fibrocalculous pancreatic diabetes and cassava consumption in a case-control study, in which 31 cases of pancreatic diabetes were compared with 45 non-diabetic control subjects who had no pancreatic calcification. Risk of diabetes was not related to cassava consumption. We also observed no increased risk of fibrocalculous pancreatic diabetes associated with alcohol consumption, history of gallbladder and biliary tract diseases, ascariasis, and family history of diabetes. Lower monthly income, farmer occupation, rural residence, and low BMI were significantly (p less than 0.05) related to pancreatic diabetes. Our data suggest that consumption of cassava may not be an important risk factor for pancreatic diabetes. With limited sample size, however, cassava consumption could not be excluded as one possible cause of fibrocalculous pancreatic diabetes.

Adult↗
PubMed1986

C-peptide secretion in calcific tropical pancreatic diabetes.

Serum C-peptide levels were measured during a glucagon stimulation test in ten normal nonobese controls and 54 diabetic patients with recent onset of diabetes under 30 years of age. Diabetic patients were comprised of 13 CTPD, 23 IDDM, and 18 NIDDM. As similar to IDDM patients, serum C-peptide concentrations did not rise significantly (P greater than 0.05) in response to glucagon administration in CTPD-patients. Mean baseline and peak serum C-peptide concentrations in CTPD-patients were significantly lower (P less than 0.001) than the values in normal controls and NIDDM patients, but were significantly higher (P less than 0.05) than those in IDDM patients. We conclude that CTPD patients have partial C-peptide reserve, which may protect against ketosis and contribute to ketosis resistance in CTPD. Our results also suggest that CTPD patients require insulin treatment. Neither baseline nor peak C-peptide levels after glucagon could discriminate CTPD from IDDM and CTPD from NIDDM.

Adult↗
PubMed1986

Exocrine pancreatic function among diabetic patients in Thailand.

Pancreozymin-secretin-stimulated secretion was measured for volume, bicarbonate concentration and total amylase output in 16 noninsulin-dependent patients and 23 age-, sex-, and weight-matched similar control subjects. Another group of 17 insulin-dependent patients was studied using secretin stimulation and the secretory response compared to a similar group of 37 control subjects. Pancreozymin-secretin-stimulated pancreatic function was normal in noninsulin-dependent patients. Abnormal values for at least one parameter of secretion were found in 82% of insulin-dependent patients. Amylase output was low in 35% and bicarbonate concentration was low in 30%. Hypersecretion occurred in 35%. One patient had abnormal values for all three parameters and three patients had two abnormal values. Hypersecretory response to secretin stimulation is considered to be an early finding of pancreatic exocrine dysfunction among insulin-dependent patients. Progressive secretory failure occurs as the pathological process increases, and a decrease in total amylase output becomes the most significant abnormality.

Adolescent↗