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3 CMJ Original Article 9-14 Corr.Pmd Original article Prevalence of β thalassaemia trait and Haemoglobin E disorders among students aged between 14-17 yrs in Kurunegala district, Sri Lanka Rohinie Warushahennadi1, Dhanuja H Wanasundara3, Wasantha Priyadarshani3, Asha M Abeysekara3, Mohamed N Jiffry2 (Index words: Thalassaemia, Prevalence, Kurunegala district) Abstract Introduction Introduction Knowledge on frequency of carrier status of Thalassemias are a heterogenous group of inherited thalassaemia in a country is very important to form a hematological disorders characterized by defect in the rate plan of reducing the disease burden. In Sri Lanka, the of production of globin chains. β thalassaemia indicates a amount of research done regarding the topic is reduced rate of synthesis of β globin chains. Hb E is a β insufficient considering the amount of thalassaemia chain variant in which Glutamine is replaced by Lysine at carriers who are being detected island wide, which is 26th position of β globin chain. In Hb E disorders there is increasing in numbers annually. Kurunegala is one of both synthesis of a structurally abnormal Hb and a reduced the districts in Sri Lanka where thalassaemia is rate of synthesis of the variant Hb [28]. prevalent. Thalassaemia is considered the most common single Objectives To determine the prevalence of and factors gene disorder worldwide occurring with high frequency associated with β thalassaemia trait and Hb E from Mediterranean basin through Middle East, Indian thalassaemia among school children aged 14-17 years subcontinent, Burma and South East Asia, and Islands of in Kurunegala district. Pacific [28]. According to WHO data, there are 269 million Methodology Descriptive cross sectional study. Using carriers of thalassaemia and 150 million β Thalassaemia probability proportional to size sampling technique, 55 alone, out of which 40 million are in South East Asia. [26] clusters of 30 students in the age range 14-17 years In Sri Lanka, thalassaemia is highly prevalent in each, were selected from all the schools in Kurunegala Kurunegala, Anuradhapura, Trincomalee and Hambantota district. Within each school, the required number of districts [23]. children were selected randomly. In countries where thalassaemia rate is high, the Results Out of the participants (n=1821), 5.7% (104) were incidence of thalassemia major has been reduced by public β thalassaemia carriers and 1.2% (21) were Hb E education, population screening, genetic counseling, and carriers. antenatal diagnosis [26]. In Sri Lanka, Ministry of Health Conclusion The results of this study provided the true started a thalassaemia screening programme for school burden of β thalassaemia trait and Hb E thalassemia in children and young adults in 2005. The main aim of this Kurunegala district. programme is identifying carriers of β thalassaemia as The study also revealed the distribution of β β thalassaemia major is the most common and most severe thalassaemia trait and Hb E disorders within the district type of thalassaemia in Sri Lanka. is not even. The frequency of thalassaemia showed a As the first step in disease prevention is identification significant difference across ethnic groups in the district. of carriers, our study aims to determine prevalence of Ceylon Medical Journal 2020; 65: 9-14 DOI: http://doi.org/10.4038/cmj.v65i1-2.9131 1Consultant Haematologist, National Thalassaemia Centre, Teaching Hospital, Kurunegala, 2Consultant Paediatrician, National Thalassaemia Centre, Teaching Hospital, Kuruneglala, 3Medical Officer, National Thalassaemia Centre, Teaching Hospital, Kurunegala, Sri Lanka. Correspondence: RW, e-mail: <[email protected]>. Received 13 December 2019 and revised version 03 March 2020 accepted 02 July 2020. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Vol. 65, No. 1&2, June 2020 9 Original article β thalassaemia trait and E thalassaemia and the factors of venous blood was drawn by qualified Nursing Officers, associated with β thalassaemia trait and E thalassaemia following universal precautions. among school children aged 14-17 years in Kurunegala Blood samples were analyzed for CBC and Hb district, Sri Lanka. electrophoresis at Thalassaemia Centre, Kurunegala with fully automated hematology analyzer (Sysmex) and Methodology Capillary electrophoresis analyzer (Sebia) respectively. Year of study: 2017-2018. These analyzers undergo quality control procedures to maintain the accuracy and precision of the results. Study design: Descriptive cross sectional study. Serum ferritin was done for samples with low Hb and Study setting: Kurunegala district, the capital city of North red cell indices to assess body iron status which may Western Province, Sri Lanka. influence the diagnosis of β thalassaemia trait. For Study population: Children within 14-17 yrs age group participants with low serum ferritin with marginally studying in schools of Kurunegala district. There were elevated HbA2, oral iron was prescribed and Hb 732 schools in Kurunegala district. The total number of electrophoresis was repeated after a course of oral iron. school children within 14-17 yrs age group is 69,665 Serum ferritin was done at Chemical Pathology (statistics of Provincial Education office, Kurunegala- Department, Teaching Hospital, Kurunegala with Immulite 2015). Total population of Kurunegala district is 1.7 million 1000 machine. (Census 2012). Sample size determination: Since the expected proportion Data analysis is not known, in order to arrive at the maximum sample size, it was taken as 50%. When alpha error = 5%, precision Sample characteristics were analyzed using des- of the estimate =5%, cluster size =30, intra-cluster criptive statistical methods, and presented as percentages correlation coefficient =0.1, the design effect =3.9, and the or proportions depending on their scales of measurements. non-response rate =10%, the required minimum sample size amounts to 1648. Ethical issues Sampling technique: Using probability proportional to The protocol was approved by the Ethical Review size sampling technique, 55 clusters of 30 students in the Committee, Teaching Hospital, Kurunegala. age range 14-17 years each, were selected from all the schools in Kurunegala district. 54 schools were sampled Permission for the study was obtained from the (Two clusters from one school and one cluster from 53 Provincial Director of Education, North Western Province. schools). Within each school, the required number of Zonal Directors of Education were informed about the children were selected randomly. If there were less than 30 schools selected for the research. Permission was obtained students in the age range, 14-17 years in a particular from all the Principals of selected schools. Written consent school, all the children in the required age group were was taken from parents of the students and the students included in the study. as well after reading out the information sheet and answering participants’ questions by the researcher. A Inclusion and exclusion critera: School children within witness (a teacher/principal) confirmed that the individual the age group 14-17 yrs studying and residing in has given the consent freely. Kurunegala district were included into the study. School children within the selected age group, studying in Kurunegala district but not residing there were excluded. Result Study instruments: A total of 1839 students aged between 14-17 yrs were initially selected for the present study. They were from 54 1. Self-administered questionnaire to get the demo- schools situated within Kurunegala district 2 clusters × graphic data. 1school + 1 cluster × 53 schools). Of those, 1821 students 2. Three ml of venous blood; (2cc EDTA sample were eligible to participate in the present study. 18 students and 1cc clotted blood) for Complete Blood Count were not eligible for the study as they did not reside in (CBC) and Hb electrophoresis (EDTA sample) and Kurunegala. Serum ferritin (clotted blood sample). The study group was predominantly female (59.9%). Of the participants, 57.4% were 14-15 yrs old. Most of the Data collection method participants were Sinhalese (93.6%), while 5.8% were Muslim and 0.4% were Tamil and 0.2% were other Participation in this study was voluntary. ethnicities. In Kurunegala, main ethnic group is Sinhalese The self-administered questionnaire was adminis- (91.9%). There are 6.5% of Muslims and 1.4% of Tamils tered on the participants to obtain demographic data. 3ml (Census 2012). 10 Ceylon Medical Journal Original article In the sample, higher participation was noted from Hb E trait was identified by relevant variant Hb band schools situated in Kurunegala (22.1%), Kuliyapitiya west in CE. In the sample, 1.2% (95% CI -0.66-1.64) showed Hb (7.7%), Mawathagama (7.6%) and Ibbagamuwa (7.5%) E band in electrophoresis (Hb E trait). Educational Divisions. When these figures were compared There were few other haemoglobinopathies identified with the statistics of Education Department, Kurunegala in the study sample. There were 10 participants (0.5%) district, highest number of students within 14-17 yrs age with Hb D trait (Heterozygous Hb D), One participant were noted in schools situated in same educational (0.1%) with Hb S trait (Heterozygous Hb S). Two divisions [Kurunegala (22.1%), Ibbagamuwa (7.2%), participants (0.1%) showed low red cell indices with high Kuliyapitiya
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