The aim – to estimate changes of the myocardial structural and functional state and intracardiac hemodynamics in patients with non-valvular permanent atrial fibrillation (PAF) under treatment with β-blockers (BB), to determine the critical value of the heart rate being a negative predictor of the echocardiographic parameters during 6 month monitoring, to identify the preference for one of the HR control strategies.
Material and methods. 30 patients were included in this study. The duration of observation was 238.3±17.0 days, it consisted in 3 visits. Titration of the BB dose lasted 67.7±10.3 days (the interval between the first and second visits). Treatment with maximal or maximal tolerable dose of BB lasted 170.6±17.7 days (the interval between the second and final visits). During the follow-up period, echocardiography was performed twice – at 2 and 3 visits.
Results. During follow-up period significant changes were revealed, i.e. increase of LV end-diastolic dimension and its index in the general group and in women; of LV end-diastolic volume in women; the increase of LV mass index in the general group and in women; basal and transverse diameters of the RV and its area in diastole; pressure in the LA; early diastolic mitral in flow velocity and its relation to early diastolic mitral annular velocity; diameters of the PA and aorta root, mitral regurgitation. Correlation analysis revealed relationship between rate of mitral annular systolic velocity and the degree of severity of mitral regurgitation with the mean daily HR value according to 24 h Holter ECG. Along with lenient heart rate control after 6 months significant increase of the the interventricular septum thickness, basal RV diameter and PA diameter was observed; fractional change of the RV area decreased. At achievement of strict heart rate control fractional change of the RV area significantly increased compared to lenient one.
Conclusions. During follow-up period in patients with PAF we observed progression of LV diastolic dysfunction, heart valve dysfunction and increase of heart chambers, more significant in women, due to pressure overload. The median daily heart rate > 91 beats/min recorded during Holter ECG is a predictor of systolic function deterioration according to the tissue Doppler. Strict heart rate control has an advantage over the lenient one to improve the myocardial structural and functional state, the size and contractility of the right heart.
The aim – to evaluate the effectiveness and safety of warfarin therapy in patients with atrial fibrillation (AF) in the anticoagulation practice, the rate of CYP2C9, CYP4F2, VKORC1 genes polymorphism and their interrelation with hemorrhagic complications among Zaporizhzhia region residents.
Material and methods. We studied 41 patients with AF (mean age – 68.2±1.2 years, men – 19, women – 22) enrolled in a 1-year out-patient observation in the anticoagulation practice of Zaporizhzhia State Medical University clinics. All patients were treated with warfarin. CYP2C9, CYP4F2, VKORC1 genes polymorphism was determined using polymerase chain reaction method.
Results. During one year hemorrhagic complications (small bleedings) arose in 22 (53.66 %) patients with AF, receiving warfarin therapy. Bleedings were significantly more frequent in the group of patients with VKORC1 gene mutation: 69.5 % vs. 37.5 %, respectively (χ2=5.331; Р<0.05). It was found that the relative risk of bleeding under warfarin treatment in patients with VKORC1 gene mutation is 1.97 (95 % CI 1.039; 3.751; Р<0.05).
Conclusions. VKORC1 polymorphism is associated with increased frequency of hemorrhagic complications in patients with AF taking warfarin, indicating the relevance of a personalized approach to the warfarin dose titration using pharmacogenetic testing.
The aim – to evaluate clinical and echocardiographic predictors of ischemic stroke in patients with non-valvular atrial fibrillation and flutter (AF-AFl).
Material and methods. In a prospective observational study with a median follow-up of 36.8 months we examined 293 patients with non-valvular AF-AFl with a mean age 60.5±10.4 years, 81 (27.65 %) patients were females. Mean CHA2DS2-VASc score was 2.25±1.46. All patients underwent clinical examination and transthoracic echocardiography. Transesophageal echocardiography was performed in 263 (89.8 %) patients.
Results. Ischemic stroke (IS) occurred in 32 (10.92 %) cases: non-fatal IS – in 26 (8.87 %) cases, fatal IS – in 6 (2.05 %) cases. Onset of IS was associated with left atrial (LA) volume index ≥ 49 ml/m2 (Р=0,011), left atrial appendage spontaneous echo contrast (SEC) 3–4+ (Р<0.001), interventricular septum thickness (IVS) ≥ 1.7 cm (Р=0.02) and class EHRAm III–IV (Р<0,001). SEIL scale (SEC 3–4 + – 1 point, EHRAm III–IV – 1 point, IVS thickness ≥ 1.7 cm – 1 point, LA index ≥ 49 ml/m2 – 1 point) was an independent predictor of occurrence of IS, relative risk (RR) 2.38 (95 % CI 1.68–3.37), Р<0.001, independent of CHA2DS2-VASc, RR 1.28 (95 % CI 1.0–1.62), Р=0.045.
Conclusions. SEIL scale may be used for assessment the risk of ischemic stroke In patients with AF-AFl independent of CHA2DS2-VASc scale.
The aim – to determine the clinical, anamnestic characteristics and indicators of the structural and functional state of the myocardium, which may predict arrhythmia recurrence in patients with reverse episode of the first-diagnosed atrial fibrillation (AF) during 6-months follow-up.
Material and methods. Among 124 patients with first diagnosed AF in 88 patients AF episode terminated with sinus rhythm restoration. In order to compare the baseline clinical, anamnestic and instrumental characteristics, groups of patients with (n=44) and without (n=44) documented recurrence of AF were formed retrospectively. In these groups, the frequency of detection of risk factors, concomitant diseases, laboratory parameters, the course of the first episode of AF, data on echocardiography, and daily ECG monitoring after recovery of sinus rhythm were compared. Multifactor analysis was performed to determine the independent predictors of AF relapse.
Results.The relapsing course of AF is associated with older age, higher incidence of certain concomitant diseases, in particular, heart failure, hypertension and diabetes, and more severe left ventricular hypertrophy. The most significant predictors of the occurrence of arrhythmia recurrence after the first episode of AF after the restoration of sinus rhythm were CHA2DS2-VASc score (≥ 2 versus 0: odds ratio (OR) 3.135 (95 % confidence intervals (CI) 1.341–7.333); Р=0.008) and C-reactive protein level (≥ 6 mg/L versus < 6 mg/L: OR 3.041 (95 % CI 1.656–5.584) P<0.001).
Conclusions. During 6-months follow-up arrhythmia recurrence was registered in 50 % patients with first episode of AF. Independent predictors of the AF recurrence were CHA2DS2-VASc score two or more, as well as the CRP ≥ 6 mg/L. These aspects should be taken into account at individualized assessment of the need for antiarrhythmic and antithrombotic therapy in patients with first detected AF after restoration of sinus rhythm.
The aim – to determine the predictors of arrhythmia recurrence in patients with non-valvular atrial fibrillation (AF) after the sinus rhythm (SR) restoring, and to establish the role of the rs10465885 polymorphism in connexin-40 (Cx40) gene.
Material and methods. We enrolled 104 patients (pts) with non-sustained non-valvular AF (average age (53±10) years, 80 (76.9 %) men). The distribution of rs10465885 polymorphic variants in Cx40 gene (n=73) was as follows: TT – 17 (23.3 %) pts, CT – 33 (45.2 %), СС – 23 (31.5 %). We analyzed 122 cases of SR restoring: 32 (26.2 %) – pharmacological cardioversion (29 pts); 63 (51.6 %) – electrical cardioversion (ECV) (53 pts); 27 (22.2 %) – radiofrequency catheter ablation (RFA) (22 pts). The follow-up median was 23 months. According to the phenotypic parameters, associated with rs10465885, the sample of 104 pts (122 SR restoring cases) was stratified into 4 phenotypic clusters (PC): PC1 – 43 pts (57 SR restoring cases), PC2 – 24 (26); PC3 – 18 (20); and PC4 – 19 (19). According to PC and rs10465885 status (carriage or relatively high probability of non-CC or CC variant), the sample of 104 pts (122 SR restoring cases) was stratified into 4 integral clusters (IC): IC1 (PC1 + non-СС) – 26 pts (32 SR restoring cases); IC2 (PC1 + СС) – 17 (25); IC3 (combined group [РC234] + non-СС) – 49 (50); IC4 (РC234 + СС) – 12 (15).
Results. The risk of AF recurrence after ECV was 1,429 times higher than that of RFA. In addition, the risk of AF recurrence after restoration of SR in patients with the CHA2DS2-VASc scale score 1 was 1,550 times lower than in patients with 0 and ≥ 2 score. PC1, in comparison with PC234, was associated with a higher frequency of rs10465885 СС variant (taking into account the pts with a relatively high probability of СС carriage). PC1 was presented mainly by men under 40 years of age, with no pronounced structural and functional changes of the left ventricle. Additionally, PC1 was characterized by an earlier AF onset, the higher prevalence of subclinical AF, and a lower risk of stroke by the CHA2DS2-VASc scale. IC2 (vs IC4) was most significantly associated factor with the AF recurrence at 90 and 180 days after SR restoring.
Conclusions. The variant of SR restoring and the CHA2DS2-VASc score were the predictors of AF-free survival. The carriage (or relatively high probability of carriage) of the polymorphic variant rs10465885 СС in Cx40 gene additionally increases the risk of arrhythmia recurrence at the 3- and 6-month follow-up after SR restoration in patients with non-valvular AF and the PC1 features (as compared to PC234).
The aim – to study the level of the nerve growth factor (NGF) and serum norepinephrine level in elderly patients with ischemic heart disease (ІHD) and ventricular extrasystoles.
Material and methods. 90 people were examined, including: 60 patients with IHD at the age of 60–74 years, including: 30 people with IHD: stable angina, I–III, СHF, ventricular extrasystoles III–IVb class by Lown; 30 people with IHD diagnosis: stable angina, I, СHF, without ventricular extrasystoles, control – 15 relatively healthy elderly subjects (mean age 68.2±2.7 years) and 15 healthy young subjects (mean age 23.5±2.5 years). All patients underwent echocardiography (EchoCG), Holter ECG monitoring, heart rate variability, high resolution ECG (ECG BP) with study of the late ventricular potentials; the levels of NGF and norepinephrine in serum were studied as well.
Results. In elderly patients with IHD, increase of the serum levels of norepinephrine and NGF were revealed in comparison to the group of practically healthy elderly. In IHD patients with ventricular extrasystoles, multidirectional indices of the level of NGF are noted: in 20 patients there was a significant increase in the level of NGF, in 10 – slightly increased in comparison with the IHD group without rhythm disturbances.
Conclusion. The patients with normal level of NGF showed significant increase of heart cavities, more pronounced myocardial hypertrophy and reduced left ventricular contractility compared to the group in which the level of NGF was significantly elevated. Results of heart rate variability assessment in comparison groups showed that in patients with ventricular extrasystoles and high level of NGF there was a significant increase in sympathetic activity with minor changes in the morphofunctional state of the myocardium.
The aim – to compare clinical and morphofunctional characteristics of patients with nonvalvular persistent atrial fibrillation and flutter (AF and AFL) with and without early arrhythmia recurrence after cardioversion.
Material and methods. One hundred and fifty patients with documented persistent AF/AFL, who underwent successful cardioversion during hospitalization period, were involved in the prospective one-center study. Scheduled registration of ECG, continuous Holter ECG monitoring and event monitoring within 7 days were performed to identify AF/AFL recurrences. Demographic, clinical and functional characteristics, concomitant diseases, treatments were compared in groups of patients with (n=50) and without (n=100) early recurrence of atrial fibrillation after cardioversion.
Results. Isolated AF occurred more often in patients without AF/AFL recurrences (Р=0.00116); AF was more often combined with different types of AFL in patients with arrhythmia recurrent episodes (Р=0.001). Patients with AF/AFL recurrences had longer duration of arrythmia history (Р=0.00048) and also tendency towards longer duration of last AF/AFL episode (Р=0.077). Patients with AF/AFL recurrences had lower daily average and minimum heart rate, larger amount of supraventricular extrasystoles (Р=0.0001), couplets (Р=0.00002) and groups (Р=0.0001) during 24-hour Holter ECG monitoring. There were more paroxysms of atrial tachycardia (Р=0.0019) in patients with AF/AFL recurrences as well.
Conclusions. Recurrent episodes of AF/AFL during hospitalization occur in one third of the patients after successful electrical or chemical cardioversion. The 24-hour Holter monitoring of ECG and event monitoring raises possibility to detect rhythm disorder at early stages after cardioversion. Presence of AFL, detection of frequent supraventricular extrasystoles, couplets and groups and short paroxysms of atrial tachyarrhythmia could be strong predictors of AF/AFL early recurrence.
The aim – to evaluate the clinical efficiency and safety of ethacizine in patients with ventricular extrasystoles (VES) without severe structural damage of the myocardium during 3 and 6 months of treatment.
Material and methods. There were examined 56 patients aged 34 to 62 years without severe structural myocardial lesions with frequent symptomatic VES requiring antiarrhythmic therapy. Anamnesis of VES was 3–14 years, on average 6.2±1.5 years. All patients were prescribed antiarrhythmic agent in a fixed dose of 50 mg t.i.d. Efficiency and safety were assessed by subjective data and ECG.
Results. When applying ethacizine for 3 months, positive antiarrhythmic effect was observed in 92.9 % of patients: in 57.2 % it was considered complete (complete or almost complete disappearance of cardiac interruptions) and in 35.7 % – as partial (reduction of symptomatic arrhythmias in 50–75 %). After 6 months of treatment, the antiarrhythmic effect of ethacizine was retained in 84 % of patients: the total antiarrhythmic effect was observed in 53.6 % and partial – in 30.4 % of patients. In most patients, antiarrhythmic effect was achieved with usage of ethacizine at a dose of 100–150 mg/day. Treatment with ethacizine in 5.4 % patients was accompanied by transient extracardiac reactions (dizziness or disturbance of accommodation). Cardiac reactions – increase in the duration of the PQ interval and QRS complex – didn’t reach the level of atrioventricular blockade and left bundle branch block.
Conclusions. Treatment with ethacizine for 6 months in patients with VES without severe structural damage to the myocardium was accompanied by improvement of the contractile function and relaxation of the myocardium, as well as an increase in the physical and mental components of quality of life by the MOS SF-36 questionnaire.
The aim – to evaluate the psychometric properties of HeartQoL in patients with non-valvular atrial fibrillation-flutter (AF–AFl), by assessing its internal consistency, construct validity, and test-retest reliability.
Material and methods. The study consisted of two phases: cross sectional, including 329 patients with AF–AFl who filled in HeartQol, SF-12, AFEQT and HADS for the evaluation of internal consistency, construct, discriminative validities and longitudinal one, including 53 patients completing HeartQoL twice to evaluate test-retest reliability.
Results. Internal consistency was sufficient, Cronbach’s alpha (α)=0.94 for physical HeartQol scale and 0.88 for psychological HeartQol scale. The construct validity was sufficient, as subscales of HeartQoL had moderate to strong correlations with similar (r≥0.55) and weakly correlated (r≤0.55) with dissimilar subscales of other questionnairies. The HeartQoL demonstrated ability to distinguish between different clinical subgroups of patients, indicating sensitivity.
Conclusions. The HeartQoL showed overall satisfactory psychometric properties, demonstrating it to be a valid instrument in the evaluation of health related quality of life in patients with AF–AFl.
The aim – to compare concomitant diseases, myocardial structure and function, clinical symptoms and course of arrhythmia in patients with first diagnosed atrial fibrillation (FDAF) with and without severe cardiovascular complications at 6-month follow-up.
Material and methods. In total, the study group included 124 patients. We evaluated symptoms, cardiovascular disease, risk factors, comorbidities, renal and thyroid function, carbohydrate and lipid metabolism, results of echocardiography, background therapy. Overall, the 6-month observation period in 25 (20.1 %) patients registered cases of death and serious cardiovascular events. For comparison of clinical-anamnestic and instrumental characteristics, groups of patients with complications (n=25) and without complications (n=99) were formed.
Results. The features of the group of patients with complications were the senior age, as well as a significantly greater initial frequency of heart failure, previous heart attacks and strokes, and diabetes mellitus. The frequency of manifestation of hypertension and coronary heart disease (except post-infarction cardiosclerosis) did not differ in comparable groups. The likelihood of complications also depended on the form of the FDAF. In particular, complications were significantly more often registered in patients with a permanent form of AF. Patients from the complicated group were characterized by more pronounced changes in the structural and functional state of the myocardium: larger left ventricular myocardium mass index and end-diastolic volume, lower left ventricular ejection fraction, significantly more often they detected moderate or severe mitral and tricuspid regurgitation.
Conclusions. Independent predictors of adverse prognosis at 6-month follow proved to be heart failure III–IV functional class NYHA, mitral regurgitation II–III degree. Comparable groups did not differ regarding severity of clinical symptoms by EHRA scale.