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Biomedical subjects

V Suvatte

Publications and source records attributed to V Suvatte.

At least 19 recordsLinked to original sources
PubMed2001

Linear growth in homozygous beta-thalassemia and beta-thalassemia/hemoglobin E patients under different treatment regimens.

The effects on linear growth and development among thalassemic patients under different treatment regimens were compared. Twelve homozygous beta-thalassemia (homozygous beta-thal) and 36 beta-thalassemia/Hb E (beta-thal/Hb E) were studied longitudinally between 1977 and 1998. Eighteen cases (10 homozygous beta-thal and 8 beta-thal/Hb E) received hypertransfusion with iron chelation by desferrioxamine. Another 30 cases (2 homozygous beta-thal and 28 beta-thal/Hb E) were given a low transfusion (depending on their clinical requirement). Their heights were measured serially and are presented as a standard deviation score (SDS). There was no significant difference in initial basic hematological data and ferritin levels between either group. However, the hypertransfused group, seemed to be clinically more severely affected than the other group as evidenced by early age at initial transfusion, the early onset of anemia and diagnosis and also their large acquired iron load after a period of transfusion. The average height SDS of the hypertransfused patients was within the 50th percentile +/- 1 SD during the first decade of life in both sexes and both genotypes. Whereas, in patients who were transfused infrequently, the SDS was always below the -1 SD and decreased gradually. In severe beta-thal/Hb E cases, their growth SDS showed no difference from those with homozygous beta-thal. Normal linear growth in those with homozygous beta thal and severe beta-thal/Hb E was only seen in the group that underwent hypertransfusion and this regimen contributed to normal growth during the first ten years of life. However, adequate iron chelation and hormonal treatment in these patients were also required in order to achieve normal adult height.

Blood Transfusion↗
PubMed2000

Successful bone marrow transplantation in a child with red blood cell pyruvate kinase deficiency.

We report the first successful use of BMT for the treatment of RBC pyruvate kinase (PK) deficiency in a boy who developed neonatal jaundice and severe transfusion-dependent hemolytic anemia a few months after birth. He received a BMT at the age of 5 from an HLA-identical sister who has normal PK activity after conditioning with busulfan and cyclophosphamide. The post-transplant course was uneventful. At present, 3 years after transplant, he is 8 years old and has a normal hemoglobin level and normal RBC PK activity without evidence of hemolysis. DNA analysis has confirmed full engraftment.

Anemia, Hemolytic↗
PubMed2000

Successful prophylaxis of intracranial hemorrhage in infants with severe congenital factor VII deficiency.

During the period 1984-1992, 2 severe cases (1 male, 1 female) of congenital F VII deficiency with intracranial hemorrhage (ICH) were referred to the Department of Pediatrics, Siriraj Hospital Bangkok, Thailand at the ages of 1 and 3 months old. They both responded very well to fresh frozen plasma (FFP) transfusion therapy. Subsequently, both had repeated episodes of ICH (repeated ICH) 5 and 6 times, despite the 10-14 days of replacement therapy for each episode and eventually died at the ages of 11 and 13 months. Since September 1996, another 2 severe cases (2 females) of congenital F VII deficiency who had ICH within their first month of life were referred to us. In order to prevent repeated ICH, we started a prophylactic regime after the second episode of ICH, by giving FFP 10 ml/kg twice a week. The average duration of follow up was 21 months (at 8 and 34 months). All of them (aged 14, and 38 months old) are doing well at this time and free from repeated ICH. From this observation, if there is FFP available, this regime is an effective way to prevent repeated ICH in infants with severe congenital Factor VII deficiency.

Blood Component Transfusion↗
PubMed1999

Compound heterozygosity for one novel and one recurrent mutation in a Thai patient with severe protein S deficiency.

Homozygous or compound heterozygous protein S (PS) deficiency is a very rare disorder in the anticoagulant system, that can lead to life-threatening thrombotic complications shortly after birth. This report describes the results of the genetic analysis of the PROS 1 genes in a Thai girl patient. She was reported in 1990 as the first case with homozygous PS deficiency and neonatal purpura fulminans. In the present report, we identified the mutations in this patient by direct sequencing of PCR products representing all 15 exons of the PROS 1 gene and their flanking intronic regions. The patient turned out to be compound heterozygous for two null mutations. One allele contained a novel sequence variation, an A-insertion in an A5-tract covering codon 146 and 147, that results in a frameshift and a stop codon (TAA) at position 155. The other allele contained a nonsense mutation in exon 12 by a transition at codon 410 CGA (Arg) to TGA (stop). Cosegregation of PS deficiency with these two genetic defects was observed in her family.

Alleles↗
PubMed1999

Gaucher's disease;thirty-two years experience at Siriraj Hospital.

Gaucher's disease, a lysosomal disorder, is not a common disease in Thailand. During the period 1966-1998 we saw 20 patients with Gaucher's disease at the Department of Pediatrics. Siriraj Hospital. The patients came from different regions of the country but mostly from the central part of Thailand. There were 8 males and 12 females from 13 families of Thai, Thai-Chinese, Thai-Laos and Chinese-Chinese in origin. A history of consanguinity was present in 2 families. The age of onset was 2 months-4 years and the age when they were diagnosed was 4 months-15 years. The most common clinical features included splenomegaly, hepatomegaly, growth retardation, pallor, bleeding disorders and neurological abnormalities. The diagnosis was made by the clinical manifestations, hematologic complications and demonstration of Gaucher cells in the bone marrow and/or other tissues. In one family, the diagnosis was confirmed by evaluation of glucocerebrosidase activities in skin fibroblasts. The management of these patients was symptomatic ie packed red cell and platelet transfusion, splenectomy and other supportive measures. Most patients died of bleeding or infection at an early age.

Adolescent↗
PubMed1998

Malignant lymphoma in Thailand: changes in the frequency of malignant lymphoma determined from a histopathologic and immunophenotypic analysis of 425 cases at Siriraj Hospital.

BACKGROUND: Analysis of malignant lymphoma in a single institution at different periods of time can determine the changing status of the disease in the region. METHODS: To compare with the large series of 1095 lymphoma cases reported between 1957-1971 at Siriraj Hospital, the largest hospital in Thailand, a similar study was performed through histopathologic evaluation of 425 lymphoma cases diagnosed consecutively at the same institution between August 1993 and October 1995. Phenotypic analysis was performed by paraffin section-immunoperoxidase studies. RESULTS: A striking increase in lymphoma cases was noted from 73 cases/year in the first series to 189 cases/year in the second series (an increase of 158.9%). Lymphoma occurred in all age groups, with a peak incidence at the seventh decade of life. The male to female ratio decreased from 2:1 in 1957-1971 to 1.3:1 in the more recent series. The incidence of Hodgkin's disease (HD) was found to have decreased from 28.9% to 8.5%. There were 36 cases (8.5%) of HD and 389 cases (91.5%) of non-Hodgkin's lymphoma (NHL) reported in the second series. The subtypes of HD included 16 cases of mixed cellularity, 13 cases of nodular sclerosis, 6 cases of lymphocyte depletion, and 1 case of lymphocyte predominance. According to the Working Formulation, the 389 NHL cases included low grade (14.1%), intermediate grade (57.3%), high grade (11.3%), and miscellaneous groups (17.2%). They were classified as small lymphocytic (9.5%), follicular (11.1%), diffuse (50.9%), immunoblastic (4.1%), small noncleaved (4.4%), lymphoblastic (2.8%), anaplastic large cell (9.0%), mycosis fungoides (1.8%), hairy cell leukemia (0.3%), true histiocytic (0.5%), and extramedullary plasmacytoma (1.0%). The immunophenotypes of the 359 NHL cases available for paraffin section-immunoperoxidase studies were B-cell (71.0%), T-cell (24.5%), histiocyte (0.6%), and undetermined phenotypes (3.9%). CONCLUSIONS: The incidence of malignant lymphoma is increasing in Thailand, with a high frequency of intermediate to high grade NHL of B-cell phenotype reported.

Adolescent↗
PubMed1998

Bone marrow, peripheral blood and cord blood stem cell transplantation in children: ten years' experience at Siriraj Hospital.

Stem cell transplantations were performed in 69 children at Siriraj Hospital over a ten year period. The source of stem cells was bone marrow (60), peripheral blood (3), or cord blood (6). The diseases treated included 35 thalassemias, 11 Burkitt's lymphoma, five non-Hodgkin's lymphoma, five aplastic anemia, eight acute leukemia, and one each of neuroblastoma, severe combined immunodeficiency, Wiskott-Aldrich syndrome, myelodysplastic syndrome, and pyruvate kinase deficiency. The success rate of stem cell transplantation in Thai children varied according to the underlying diseases of the patients, ranging from 50% in acute leukemia to 100% in aplastic anemia. The outcome of stem cell transplantation in 35 thalassemic children revealed 23 (79.4%) were cured, whereas three (10.3%) remain alive with disease and the other three (10.3%) died. The incidence of graft-versus-host disease was low hen compared with that of Western countries. It is concluded that bone marrow, peripheral blood and cord blood stem cell transplantation will be the treatment of choice and will be widely used in the future to cure many hematologic and malignant disorders in children.

Adolescent↗
PubMed1997

Pyruvate kinase deficiency in an alpha-thalassemia family: first case report in Thailand.

In Thailand, the most common cause of chronic hemolytic anemia is thalassemia hemoglobinopathy. We report here a 10-year-old girl with pyruvate kinase (PK) deficiency who was initially diagnosed to have Hb H disease, like her sister. The patient had a history of neonatal jaundice which required blood exchange transfusion twice and phototherapy. She became anemic and regular blood transfusion was required since the age of 2 1/2 months. She was very anemic compared to her sister and was transfusion dependent. Besides, she never had red cell inclusion bodies, thus re-evaluation was performed. The diagnosis of red cell pyruvate kinase deficiency and the exclusion of Hb H disease was achieved after cessation of blood transfusion for 3 months. The family study also confirmed the diagnosis. The patient is now on high transfusion and iron chelation. She is doing well with mild splenomegaly.

Child↗
PubMed1995

Collection of cord blood stem cells for transplantation in thalassemic patients.

Thalassemia is widely distributed throughout the world and is one of the major public health problems. The use of bone marrow transplantation, the only curative therapy for thalassemia, is limited because less than 30% of the patients have unaffected and HLA-identical siblings as donors. Cord blood stem cells, an alternative source of stem cells for transplantation, have been successfully transplanted into patients with several diseases after myeloablative therapy. Twenty cord blood samples from unaffected neonates whose siblings had severe thalassemia were collected. The median volume was 80 ml. The median number of cells and colony forming units-granulocyte-macrophage in cord blood was 9.2 x 10(8) and 3.4 x 10(5), respectively. Four of 20 cord blood samples had HLA-matched to the affected siblings. One patient underwent cord blood transplantation with success; one patient is waiting for transplantation.

Blood Specimen Collection↗
PubMed1995

Glucose-6-phosphate dehydrogenase deficiency in the newborn: its prevalence and relation to neonatal jaundice.

Glucose-6-phosphate dehydrogenase (G6PD) deficiency is prevalent in Thailand. This condition can cause acute hemolysis during oxidative stress and also severe hyperbilirubinemia in the newborn in some populations. Our aim was to study the prevalence of G6PD deficiency in relation to neonatal jaundice. We performed quantitative red blood cell (RBC) G6PD assay in the cord blood of 505 male subjects. Observation of jaundice and determination of bilirubin level as well as work up for other causes of jaundice were made in the G6PD deficiency group compared to a G6PD normal group. Questionnaires were also sent for further follow up to both groups. The results of the study were as follows: Sixty-one of 505 male (12.08%) had RBC G6PD deficiency (Group I). The rest (444 cases) had normal G6PD (Group II). In Group I, 49.15% developed neonatal jaundice, of which 28.82% were physiologic and 20.33% were pathologic jaundice. In group II, 23.68% developed jaundice; 16.51% were physiologic and 7.17% were pathologic jaundice, respectively. Onset of jaundice, date of peak bilirubin and peak bilirubin level in Group I and Group II were not statistically different. ABO incompatibility was associated with Group I in 17.24% and with Group II in 9.09%. Hospitalization day in Groups I and II were not statistically different. Other associated diseases were found in both groups, ie infection, congenital malformation, respiratory distress syndrome, but there was no significant difference in terms of jaundice. Phototherapy was required in 18.64% and 10.28% in Group I and II with a duration of 3.91 +/- 1.24 and 3.21 +/- 1.75 days, respectively. One case in Group I who was also premature received one exchange blood transfusion due to severe sepsis but he did not survive. One case in Group II who had polycythemia was successfully treated by partial exchange transfusion with plasma.

Bilirubin↗
PubMed1995

Prevalence of hemoglobin E, alpha-thalassemia and glucose-6-phosphate dehydrogenase deficiency in 1,000 cord bloods studied in Bangkok.

Thalassemia hemoglobinopathies and glucose-6-phosphate dehydrogenase (G-6-PD) deficiency are prevalent in Thailand. We studied the prevalence of these disorders from 1,000 cord bloods collected during 14 months period, using EDTA as anticoagulant. Red blood cell G-6-PD quantitative assay was performed in all male subjects. Nine hundred and eighty five specimens were available for hemoglobin (Hb) typing by starch gel electrophoresis. Further evaluation by cellulose acetate electrophoresis and follow up were made in the cases who had Hb E and/or high level of Hb Bart's. It was found that out of 505 males, 61 cases (12.08%) had G-6-PD deficiency. Among 985 cases studied for Hb typing, 61.92% revealed normal Hb type AF while Hb E was present in 18.68% and Hb Bart's designated alpha-thalassemias were present in 25.18% respectively. Of these 985 cases, 18.78% had low Hb Bart's level ie detectable to 8.2% consistent with alpha-thal2, Hb Constant Spring (CS) or alpha-thal1 trait. Ten cases (1.02%) had high levels of Hb Bart's ranging from 16.1-35% without or with Hb CS and E, and further follow-up revealed homozygous Hb CS, Hb A-E-Bart's, Hb H and Hb H with Hb CS disease. The other 53 cases (5.38%) had low level of Hb Bart's with Hb E consistent with alpha-thalassemia trait with Hb E trait. There were 127 cases (12.89%) who had only Hb E trait and 3 cases (0.3%) who had Hb F and E without Hb A initially.

Erythrocytes↗
PubMed1995

Study of hematopoietic progenitor cells in thalassemia after bone marrow transplantation.

The hematopoietic committed progenitor cells (BFU-E and CFU-GM) in blood and bone marrow were studied in thalassemic patients before and after bone marrow transplantation. Eighteen transplants were performed in 17 patients with thalassemia. Five were homozygous beta-thalassemia and 12 were beta-thalassemia/hemoglobin E disease. The age ranged from 1.2-14 years (median = 3.4 years). The conditioning regimen comprised busulfan 3.5-4 mg/kg/day for 4 days and cyclophosphamide 50 mg/kg/day for 4 days. Cyclosporin in combination with methotrexate were administered post transplant for GVHD prophylaxis. Before transplantation, BFU-E and CFU-GM in the blood of the patients were significantly higher compared with normal (p < 0.05) but were normal in the bone marrow. Only the CFU-GM in the bone marrow of the successful cases after transplantation recovered to the normal level at the first month through the 12th month whereas the BFU-E were low. Both CFU-GM and BFU-E in the blood were lower than normal after follow up to the 12th month. Inspite of the low number of progenitor cells, there was hematological recovery in the blood of the patients. It may be due to the capacity of the hematopoiesis react to stress which could be amplified the differentiation compartment or the shortened-transit time through the stem cell compartment.

Bone Marrow↗
PubMed1993

Hemophilia with factor VIII and factor IX inhibitors, incidence, bleeding problems and management.

Among 117 cases of hemophilia, there were 7 hemophilia A and 2 hemophilia B with factor VIII and factor IX inhibitors diagnosed at the Department of Pediatrics, Siriraj Hospital, Bangkok, Thailand. The overall incidence of hemophilia with inhibitors was 7.7%. Eight cases (6 hemophilia A. 2 hemophilia B) were severe hemophilia and 1 moderate hemophilia A. The average age of the inhibitor detection was about 5 years. Of the 9 cases, 7 had high inhibitor titers and 2 had low inhibitor titers. The frequency of bleeding problems before and after inhibitor detection were not different. The bleedings included hemarthrosis, mucosal bleed, hematoma, oozing from wound, hematuria and intracranial hemorrhage. The treatment of hemarthrosis in hemophilia A with low inhibitor titers was the combination of short course of prednisolone and single large dose factor VIII. In high inhibitor titer patients with acute hemarthrosis (both hemophilia A and hemophilia B), the treatment consisted of prednisolone short course and single high dose of PCC. For bleeding control in both high and low inhibitor titer with mucosal bleeds, oozing from wounds, central nervous system bleeding and hematuria, the combination was used of high dose factor VIII or factor IX for 2 days, and tranexamic acid, prednisolone, cyclophosphamide were required. In life-threatening hemorrhage and surgical operation, plasmapheresis and large dosage factor VIII or factor IX were the treatment of choice. All supportive measures were also important in every case of mucosal bleeds, wounds and surgical operations. The result of treatment revealed one death from massive intracranial hemorrhage and 8 survivals, with joint contracture in 2 cases. All still have inhibitor detected, but in low titer.

Child↗
PubMed1993

Evidence of vitamin K deficiency in cord blood.

The prevalence of vitamin K deficiency in the newborns delivered at Siriraj Hospital was studied. The prolongation of one stage prothrombin time and the presence of PIVKA-II (non carboxylated prothrombin antigen) in cord blood were interpreted as the secondary change from vitamin K deficiency state. The most reliable method to diagnose vitamin K deficiency is the detection of vitamin K level in plasma which is not yet available in Thailand. Although the prevalence of vitamin K deficiency in the newborns from our data is not high, only 0.6%, it is shown that some of the apparently normal newborn infants may have bleeding problem from vitamin K deficiency in both newborn and early infancy periods. So, the correction of this deficiency by administration of vitamin K to all newborns is appropriate and reasonable decision.

Biomarkers↗
PubMed1993

Risk of transfusion associated AIDS by seronegative blood in Thailand: a multicenter report.

Prevention of transfusion associated AIDS (TAA) in Thailand began in 1986 when the HIV infection started to be sharply increased among the general population. The retrospective anti-HIV screening in various blood donor populations by The National Blood Center (NBC) revealed a seroconverted prisoner. Then the use of prisoners, prisoners' blood was not recommended from 1986. In April 1987, the first case of TAA was disclosed. Five months later, anti-HIV screening in all units of blood was firstly introduced at Ramathibodi Hospital (RH) and NBC. From 1989, anti-HIV screening in all units of blood is mandatory nationwide by Ministry of Public Health. Despite the anti-HIV screening, TAA cases transmitted by seronegative blood were gradually reported. Among many Medical Centers, there were 9 and 18 cases of TAA recorded from Chiang Mai and Bangkok areas respectively, since 1985. In addition, several new seroconverters were observed among voluntary blood donors. All of this evidence indicates the existence of blood donation during the early stage of infection, the so-called "window period". At present, HIV-P24 antigen ELISA seems to be the only available technique for mass screening. In 1990, NBC successfully performed a retrospective study on HIV-Ag ELISA screening by obtaining the prevalence of 1/10,000 units of blood. At the same period of time, in RH prospective study, a unit of blood with HIV-Ag only was detected when 3432 units of blood were screened. The HIV-Ag ELISA screening was then performed on every unit of blood routinely since Aug 12, 1991 at RH.(ABSTRACT TRUNCATED AT 250 WORDS)

Acquired Immunodeficiency Syndrome↗