Implication of current ASE/EACVI left ventricular diastolic function classification in predicting 2-year MACE in asymptomatic patients with diabetes and hypertension

Abstract

Abstract Funding Acknowledgements Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Ministry of Health Malaysia Background Left ventricular diastolic dysfunction (LVDD) has been shown to be more prevalent in patients with diabetes, and once progress to overt heart failure, carry worse clinical outcomes. Substantial number of patients were classified as indeterminate diastolic function based on the current ASE/EACVI guidelines. The implication of current diastolic function classification in predicting MACE among diabetic patients is not well established. Purpose To assess prognostic impact of current guidelines-based diastolic function classification, and determine predictors of 2-year MACE based on individual LVDD parameters. Methods A total of 111 patients with diabetes and hypertension who attended diabetic clinic follow-up at the primary healthcare settings were enrolled. All patients had no prior cardiovascular events, had preserved left ventricular (LV) ejection fraction on echocardiography and sinus rhythm on ECG at screening. Echocardiography was performed to obtain parameters of LV dimensions, LV volumes and LV diastolic function. The 2016 ASE/EACVI guidelines were applied to classify diastolic function. All patients were followed up until 2 years to assess MACE. Results There were 65 (58.6%) female patients. Mean age was 59.86 ± 7.45 years; mean duration of type 2 diabetes was 10.5 ± 5.41 years. 80 (72.1%) patients were classified as having normal diastolic function (nDF); 24 (21.6%) patients were classified as indeterminate diastolic function (iDF); 7 patients (6.3%) were classified as LVDD. Patients with LVDD had significantly higher LV mass index (LVMI) (mean 121.72 ± 23.28g/m2 vs 116.62 ± 24.66g/m2 in iDF vs 102.50 ± 22.89g/m2 in nDF, p = 0.003); higher left atrial volume index (LAVI) (mean 41.24 ± 10.28ml/m2 vs 30.55 ± 10.07ml/m2 in iDF vs 25.75 ± 6.30ml/m2 in nDF, p < 0.001); lower lateral e’ velocity (mean 6.35 ± 2.05cm/s vs 7.37 ± 1.73cm/s in iDF vs 8.59 ± 2.13cm/s in nDF, p = 0.003); higher septal E/e’ ratio (mean 14.89 ± 3.29 vs 12.16 ± 3.99 in iDF vs 9.99 ± 2.35 in nDF, p = 0.001); higher average septal-lateral E/e’ ratio (mean 14.22 ± 3.77 vs 11.34 ± 3.74 in iDF vs 9.04 ± 2.10 in nDF, p < 0.001). Among these 111 patients, 10 patients (9%) reported MACE at 2 years. The risk of 2-year MACE is elevated in both indeterminate diastolic function[hazards ratio (HR) 3.80, p = 0.023] and LVDD (HR 37.78, p = 0.002). BMI (HR 1.25, p = 0.004), and systolic blood pressure (HR 1.07, p < 0.001) were found to be associated with 2-year MACE. Conclusions LVDD and indeterminate diastolic function were correlated with increased MACE at 2 years. BMI and systolic blood pressure were predictors of increased risk of MACE at 2 years. Further investigation with larger sample size is warranted.