Comparison of oral glucose tolerance test and ambulatory glycaemic profiles in pregnant women in Uganda with gestational diabetes using the FreeStyle Libre flash glucose monitoring system.

BACKGROUND: The diagnosis of hyperglycaemia in sub-Saharan Africa (SSA) is challenging. Blood glucose levels obtained during oral glucose tolerance test (OGTT) may not reflect home glycaemic profiles. We compare OGTT results with home glycaemic profiles obtained using the FreeStyle Libre continuous glucose monitoring device (FSL-CGM). METHODS: Twenty-eight women (20 with gestational diabetes [GDM], 8 controls) were recruited following OGTT between 24 and 28 weeks of gestation. All women wore the FSL-CGM device for 48-96 h at home in early third trimester, and recorded a meal diary. OGTT was repeated on the final day of FSL-CGM recording. OGTT results were compared with ambulatory glycaemic variables, and repeat OGTT was undertaken whilst wearing FSL-CGM to determine accuracy of the device. RESULTS: FSL-CGM results were available for 27/28 women with mean data capture 92.8%. There were significant differences in the ambulatory fasting, post-prandial peaks, and mean glucose between controls in whom both primary and secondary OGTT was normal (n = 6) and those with two abnormal OGTTs or "true" GDM (n = 7). There was no difference in ambulatory mean glucose between these controls and the 13 women who had an abnormal primary OGTT and normal repeat OGTT. These participants had significantly lower body mass index (BMI) than the true GDM group (29.0 Vs 36.3 kg/m2, p-value 0.014). Paired OGTT/FSL-CGM readings revealed a Mean Absolute difference (MAD) -0.58 mmol/L and Mean Absolute Relative Difference (MARD) -11.9%. Bland-Altman plot suggests FSL-CGM underestimated blood glucose by approximately 0.78 mmol/L. CONCLUSION: Diagnosis of GDM on a single OGTT identifies a proportion of women who do not have a significantly higher home glucose levels than controls. This raises questions about factors which may affect the reproducibility of OGTT in this population, including food insecurity and atypical phenotypes of diabetes. More investigation is needed to understand the suitability of the OGTT as a diagnostic test in sub-Saharan Africa.

Medical complications in pregnancy at Mulago Hospital, Uganda's national referral hospital.

INTRODUCTION: Medical complications in pregnancy contribute significantly to maternal morbidity in sub-Saharan Africa. Anecdotally, obstetricians in Uganda do not feel equipped to treat complex medical cases, and receive little support from physicians. METHODS: The aim of the study was to quantify the burden of complex medical conditions on the obstetric high dependency unit at Mulago National Referral Hospital, and potential deficiencies in the referral of cases and training in obstetric medicine. A prospective audit was taken on the obstetric high dependency unit from April to May 2014. In addition, 50 trainees in obstetrics and gynaecology filled a nine-point questionnaire regarding their experiences. RESULTS: Complex medical disorders of pregnancy accounted for 22/106 (21%) admissions to the high dependency unit, and these cases were responsible for 51% of total bed occupancy, and had a case fatality rate of 6/22 (27.2%). Only 6/14 (43%) of referrals to medical specialties were fulfilled within 48 h. Of the six women who died due to medical conditions, three specialty referrals were made, none of which were fulfilled. Trainees reported deficiencies in obstetric medicine training and in referral of complex conditions. They were least confident addressing non-communicable conditions in pregnancy. DISCUSSION: Deficiencies exist in the care of women with complex medical conditions in pregnancy in Uganda. Frameworks of obstetric medicine training and referral of complex cases should be explored and adapted to the sub-Saharan African setting.