The aim of this study was to compare the right ventricular (RV) structure and diastolic function between normotensive and non-diabetic subjects with metabolic syndrome (MS), and new diagnosed diabetic and hypertensive patients. Study included 89 normotensive and non-diabetic subjects with MS which was defined by the presence ≥3 ATP-NCEP-III criteria, 45 diabetic and 117 hypertensive patients, as well as 76 controls with no MS criteria, matched for age and sex. All subjects underwent laboratory blood tests and complete two-dimensional echocardiography including pulsed and tissue Doppler. RV free wall thickness was similar between MS and diabetic patients, but significantly lower than in hypertensive patients (4.6 ± 0.8 versus 4.3 ± 0.7 versus 4.9 ± 0.9 mm; p < 0.01). Tricuspid E/e' ratio was similar between observed groups (5.3 ± 1.2 versus 5.2 ± 1.1 versus 5.7 ± 1.2, p > 0.05). RV systolic function evaluated by tissue Doppler (st) was similar between MS and diabetic participants, but still worse than in hypertensive patients (13.1 ± 2.2 versus 13.5 ± 2.5 versus 12.5 ± 2.4, p < 0.05). Global RV function estimated by Tei index was similar among MS and diabetic patients, and most impaired in hypertensive patients (0.47 ± 0.09 versus 0.45 ± 0.08 versus 0.52 ± 0.1, p < 0.01). Increased fasting glucose level, abdominal obesity and hypertension were independent predictors of biventricular hypertrophy, diastolic dysfunction and global dysfunction in whole population. RV structure and function gradually deteriorated from diabetic patients, across MS subject, to hypertensive patients. Normotensive and non-diabetic subjects with MS had similar level of RV impairment as diabetic patients which emphasize the synergic effects of MS components on cardiac damage.
Keywords: Diabetes; hypertension; metabolic syndrome; right ventricle.