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Infective endocarditis (IE) induces the rise of pro-inflammatory cytokines. Some of them can stimulate oxidants production in myocardium with subsequent peroxidative damage to various biomolecules. We compared indices of oxidative stress: H2O2, thiobarbituric acid-reactive substances (TBARs), thiols in myocardium specimens between patients with active IE and those with valvular heart disease (VHD) of rheumatic etiology who underwent surgical valve replacement.17 left ventricle papillary muscle specimens and 28 specimens of auricle of the right heart were collected from 45IE patients, and 16 papillary muscle and 12 auricle specimens from 28 VHD patients, respectively. Patients groups had similar NYHA functional class and majority of echocardiographic indices of heart morphology. H2O2 and TBARs were determined fluorometrically in myocardium homogenates whereas thiols with photometric method. Between and within groups comparisons and mutual correlations between variables were analyzed.H2O2 generation from all myocardium specimens and auricles was 2.14- and 2.59- times higher (p0.001) in IE patients than in VHD group. Auricles had the highest H2O2 levels within IE group. TBARs were 10-times higher (p0.05) in IE when compared to VHD group in auricles and papillary muscles. Thiols did not differ between groups. H2O2 positively correlated with TBARs and negatively with thiols in all IE myocardium specimens (r=0.31 and r=-0.46, p0.05) and auricles (r=0.58 and r=-0.67, p0.05), respectively. No such associations were noted in VHD specimens.Active IE induces enhanced myocardial production of H2O2 and formation of TBARs which proves occurrence of oxidative stress in the heart.

Background Emery–Dreifuss muscular dystrophy (EDMD) characterized by musculoskeletal abnormalities is often associated with atrioventricular conduction disturbances. Although some EDMD patients were reported to develop dilated cardiomyopathy, there are limited data on their left ventricular (LV) performance. Methods Therefore, we echocardiographically assessed 27 men (23 cases aged 26.4±6.8 years with X-linked, and four cases aged 22.2±8.6 years with autosomal dominant (AD)) EDMD. Control group included 16 male healthy controls aged 24.8±6.0 (18–37) years. Results Although LV end diastolic dimension was similar in EDMD and controls (4.9±0.6 and 4.99±1.1 cm, ns), dilated left ventricle was found in three X-linked EDMD subjects. LV ejection fraction was significantly reduced in EDMD (62.3±1% vs. 71.2±2%, p =0.01) and was below 50% in six (22.2%) X-linked EDMD patients. Doppler analysis disclosed prolonged isovolumetric relaxation time of the left ventricle in the studied group. This finding may indicate impaired LV relaxation. Conclusion A significant subgroup of X-linked EDMD patients shows pronounced abnormalities of left ventricular function. This warrants cardiologic follow up of EDMD patients.