Yan Chen1, Chun-Ting Zhao1, Zhe Zhen1, Arthur Wong1, Hung Fat Tse2, Kai Hang Yiu3. 1. Division of Cardiology, Department of Medicine, the University of Hong Kong, Queen Mary Hospital, Hong Kong, China. 2. Division of Cardiology, Department of Medicine, the University of Hong Kong, Queen Mary Hospital, Hong Kong, China; Research Centre of Heart, Brain, Hormone and Healthy Aging, Li Ka Shing Faculty of Medicine, the University of Hong Kong, Hong Kong, China. Electronic address: hftse@hkucc.hku.hk. 3. Division of Cardiology, Department of Medicine, the University of Hong Kong, Queen Mary Hospital, Hong Kong, China; Research Centre of Heart, Brain, Hormone and Healthy Aging, Li Ka Shing Faculty of Medicine, the University of Hong Kong, Hong Kong, China. Electronic address: khkyiu@hku.hk.
Abstract
AIMS: The underlying mechanism of myocardial dysfunction in patients with type 2 diabetes mellitus (T2DM) is unclear. Nonetheless recent studies have revealed that vitamin D (vit-D) deficiency, which is prevalent in such patients, is associated with adverse cardiovascular events. We hypothesized that vit-D deficiency in patients with T2DM may contribute to left ventricular (LV) dysfunction. METHODS: We studied 95 patients (62±9years, 58% female) with T2DM. None had any history of coronary artery disease and all underwent detailed transthoracic echocardiography, including speckle tracking derived strains. Plasma level of 25-hydoxyvitamin D (25-OHD) was also measured. RESULTS: Vitamin D deficiency was evident in 60 (63%) patients. The LV dimension, LVEF and diastolic grade were similar between those with and without deficiency although an impaired global longitudinal strain was present in the former. Importantly, 25-OHD was negatively associated with global longitudinal strain (R = -0.21, P=0.046) and positively with body-mass index (BMI; R=0.26, P=0.01). Both vit-D deficiency and BMI were associated with impaired global LV longitudinal strain, independent of T2DM disease characteristics. CONCLUSIONS: In patients with T2DM and no history of coronary artery disease, vit-D deficiency is independently associated with impaired global longitudinal strain. This suggests that vit-D deficiency may contribute to the development of myocardial dysfunction in these patients.
AIMS: The underlying mechanism of myocardial dysfunction in patients with type 2 diabetes mellitus (T2DM) is unclear. Nonetheless recent studies have revealed that vitamin D (vit-D) deficiency, which is prevalent in such patients, is associated with adverse cardiovascular events. We hypothesized that vit-D deficiency in patients with T2DM may contribute to left ventricular (LV) dysfunction. METHODS: We studied 95 patients (62±9years, 58% female) with T2DM. None had any history of coronary artery disease and all underwent detailed transthoracic echocardiography, including speckle tracking derived strains. Plasma level of 25-hydoxyvitamin D (25-OHD) was also measured. RESULTS:Vitamin D deficiency was evident in 60 (63%) patients. The LV dimension, LVEF and diastolic grade were similar between those with and without deficiency although an impaired global longitudinal strain was present in the former. Importantly, 25-OHD was negatively associated with global longitudinal strain (R = -0.21, P=0.046) and positively with body-mass index (BMI; R=0.26, P=0.01). Both vit-D deficiency and BMI were associated with impaired global LV longitudinal strain, independent of T2DM disease characteristics. CONCLUSIONS: In patients with T2DM and no history of coronary artery disease, vit-D deficiency is independently associated with impaired global longitudinal strain. This suggests that vit-D deficiency may contribute to the development of myocardial dysfunction in these patients.
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