3. Electronic Theses and Dissertations (ETDs) - All submissions
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Item Caregivers' experiences of service provision for their children diagnosed with Autism Spectrum Disorder(2010-06-28T10:39:15Z) Hooper, Jennifer JaneAn increase in the prevalence of ASD has led to increased demands on service provision. This questionnaire-based, descriptive study aimed to explore service use and experiences of health and education service delivery by caregivers and their children with ASD in Johannesburg. The sample size was 39. Comparisons were drawn between the experiences of the participants accessing the private and public service sectors. Children were diagnosed at an average age of 4 years; 2 years after the first symptoms were noted by their caregivers. Families accessed a mean of 3 institutions and 6 professionals in seeking diagnosis and treatment. No specific referral patterns could be established. Challenges to service access identified by caregivers included: logistical problems, lack of professional knowledge and experience, poor parental coping and insight, and lack of community support. Solutions identified by the caregivers included: marketing, training, better referral procedures, and establishment of educational facilities.Item Evaluation of CYP2C9 and VKORC1 gene variants that may result in warfarin dosage sensitivity and poor pregnancy outcomes(2008-10-15T10:23:47Z) Mitchell, CathrineWarfarin is the most widely prescribed oral anticoagulant used for the long-term treatment and prevention of thromboembolic events. Its administration is challenging as it may result in bleeding-related deaths, inadequate anticoagulation and fetal teratogenesis, including fetal warfarin syndrome. A number of environmental and genetic factors contribute to interindividual warfarin dosage variability. The CYP2C9 and VKORC1 genes explain 40- 50% of this variability. The aim of this study was to determine the frequency of known and any new variants in these genes in the SA black population, and correlate these variants and a small subset of environmental factors to dosage variability and pregnancy outcomes. I sequenced the exons and intron/exon boundaries of the CYP2C9 and VKORC1 genes in 100 random black control and 113 patient samples that had at least one pregnancy on warfarin. I observed six previously described CYP2C9 variants, 27 novel CYP2C9 variants, and three previously described VKORC1 variants. 14 of these variants were observed at an allele frequency of 0.02. Of these 14, six appear to decrease (all of which are CYP2C9 variants) and four increase (2 CYP2C9 variants and two VKORC1 variants) warfarin dosage requirement. These 14 CYP2C9 and VKORC1 variants along with a small subset of environmental factors account for 45.3% of warfarin dosage variability in the SA population. I observed an increase in the number of poor pregnancy outcomes in patients on high doses of warfarin. These results allow us to predict the maintenance dose of warfarin in SA black patients better, thereby reducing the risk of adverse effects, and identify those at risk of having a poor pregnancy outcome.