TITLE:
What Are the Determinants of Insulin Resistance (IR) and How Effective Is the Sub-Saharan Africa-Specific Threshold of Abdominal Obesity (AO-SSA) Identifying IR in Congolese Black Hypertensive Patients?
AUTHORS:
Bernard Kianu Phanzu, Benjamin Longo-Mbenza, Jean Bosco Kasiam Lasion’kin, Jody Mbuilu Pukuta, Eleuthère Kintoki Vita, Nanoue Masolo Muze Kianu
KEYWORDS:
Insulin Resistance, Hypertension, Sub-Saharan Africa, Abdominal Obesity
JOURNAL NAME:
World Journal of Cardiovascular Diseases,
Vol.4 No.13,
December
15,
2014
ABSTRACT: Background: Hypertensive patients with insulin resistance (IR) are at greater risk of cardiovascular disease and may represent a particular subset of hypertension (HTN) requiring special medical attention. Quantitative measurements of the IR are not suitable for routine clinical practice. Met-abolic syndrome (MetS) or simply abdominal obesity (AO) is surrogate of IR. The performance of the recently proposed Sub-Saharan Africa cut-off point of abdominal obesity for identifying IR in hypertensive patients has never been evaluated. Aims: The main objective was to compare the performance of the newly proposed Sub-Saharan Africa specific threshold of abdominal obesity (AO-SSA) to that of IDF (AO-IDF) in identifying IR in Congolese Black Hypertensive Patients. Methods: A cross-sectional study was conducted at the Heart of Africa Cardiovascular Center, Lomo Medical Clinic, Kinshasa Limete, DR Congo, between January 2007 and January 2010. Homeostatic model assessment (HOMA) index was calculated to determine IR. Multivariate logistic regression analysis was used to assess the independent determinants of IR. The intrinsic (sensitivity and specificity) and extrinsic (positive predictive value and negative predictive value) characteristics of the AO-SSA, AO-IDF, AO-ATP III, MetS-SSA, MetS-IDF, and MetS-ATP III were calculated. The kappa statistic was determined for agreement between the ATPIII, IDF and SSA defined AO and MetS with HOMA-IR. Results: Men represented the majority of the enrolled patients: 105 (64.4%) and the mean age of all participants were 57 ± 11 years. Insulin resistance was found in 79.1% of the study population with 88.7, 79.3, 84.6, 71.4, 75.5, 91.1, 60.3 and 44.8 respectively among patient with MetS-ATP, MetS-IDF, MetS-SSA, AO-ATP III, AO-IDF, AO-SSA, diabetics and non-obese non-diabetic hypertensive patients. In multivariate analysis, the risk of IR was associated independently and significantly (p