%0 Journal Article
%T Vitamin D, Parathyroid Hormone, Insulin Sensitivity and Islet <i>¦Â</i>-Cell Secretory Function in Diabetic Patients from South Kivu in the Democratic Republic of Congo: Cross-Sectional Study
%A Dieudonne Masemo Bihehe
%A Ahadi Birindwa Bwihangane
%A Jean-Paulin Mukonkole Mbo
%A Michel Hermans
%A Philippe Bianga Katchunga
%J Journal of Diabetes Mellitus
%P 81-94
%@ 2160-5858
%D 2024
%I Scientific Research Publishing
%R 10.4236/jdm.2024.142008
%X Background: The role of vitamin D and parathyroid hormone in the metabolic profile of type 2 diabetes mellitus in sub-Saharan Africa has not been adequately assessed. The aim of this study was to determine the prevalence of low vitamin D level and secondary hyperparathyroidism and their association with insulin sensitivity and ¦Â-cell secretory function among Congolese type 2 diabetics. Methodology: Fasting glycaemia, fasting insulin, 25OH D3 and human parathyroid hormone (hPTH) were measured in one hundred and eighty-four type 2 diabetic patients followed as outpatients in South Kivu. Levels of 25OH D3 < 30 ng/ml and hPTH > 65 pg/ml defined low vitamin D and elevated parathyroid hormone levels, respectively. The HOMA model was used to measure insulin sensitivity and ¦Â-cell secretory function. Results: Medians (IQR) were 25.3 (20.4 - 32.4) ng/ml for 25OH D3 and 53.7 (38.4 - 115.7) pg/ml for hPTH. 58.7% of diabetics had insulin resistance, 126 (68.5%) had low vitamin D and 80 (43.5%) had hyperparathyroidism. In multivariate analysis, hPTH (partial r = −0.28; p = 0.0002) and 25OH D3 (partial r = 0.16; p = 0.03) showed an independent association with insulin sensitivity after adjustment for body mass index and waist circumference. Finally, hPTH (partial r = 0.27; p = 0.0002) was the sole determinant of ¦Â-cell secretory function. Conclusions: This study confirms the high prevalence of low vitamin D level and secondary hyperparathyroidism and their association with insulin resistance and impaired islet ¦Â-cell secretory function among Congolese with type 2 diabetes mellitus. Vitamin D and calcium supplementation should be envisaged for cases of deficiency in this region.
%K Vitamin D
%K Parathyroid Hormone
%K Diabetes Mellitus
%K Insulin Resistance
%K South Kivu
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=132044