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The implantation of a subcutaneous cardioverter-defibrillator (S-ICD) may be used instead of a traditional transvenous system to prevent sudden cardiac death. Our aim was to compare the characteristics of S-ICD patients from the multi-center registry of S-ICD implantations in Poland with the published results of the European Snapshot Survey on S-ICD Implantation (ESSS-SICDI). We compared data of 137 Polish S-ICD patients with 68 patients from the ESSS-SICDI registry. The groups did not differ significantly in terms of sex, prevalence of ischemic cardiomyopathy, concomitant diseases, and the rate of primary prevention indication. Polish patients had more advanced heart failure (New York Heart Association (NYHA) class III: 11.7% vs. 2.9%, NYHA II: 48.9% vs. 29.4%, NYHA I: 39.4% vs. 67.7%, p &lt, 0.05 each). Young age (75.9% vs. 50%, p &lt, 0.05) and no vascular access (7.3% vs. 0%, p &lt, 0.05) were more often indications for S-ICD. The percentage of patients after transvenous system removal due to infections was significantly higher in the Polish group (11% vs. 1.5%, p &lt, 0.05). In the European population, S-ICD was more frequently chosen because of patients’ active lifestyle and patients’ preference (both 10.3% vs. 0%, p &lt, 0.05). Our analysis shows that in Poland, compared to other European countries, subcutaneous cardioverters-defibrillators are being implanted in patients at a more advanced stage of chronic heart failure. The most frequent reason for choosing a subcutaneous system instead of a transvenous ICD is the young age of a patient.

INTRODUCTION Additional risk assessment in patients with heart failure referred for implantable cardioverter‑defibrillator (ICD) implantation as primary prevention is needed. A reduction in left ventricular ejection fraction (LVEF) seems to lack sufficient sensitivity and specificity to be used for identification of patients at the highest risk of sudden cardiac death. OBJECTIVES The aim of this study was to identify short- and long‑term predictors of appropriate implantable cardioverter‑defibrillator therapy as well as predictors of long‑term mortality in patients with an ICD or cardiac resynchronization therapy defibrillator (CRT‑D). PATIENTS AND METHODS In this retrospective study, data from 457 patients who had an ICD or CRT‑D implanted between 2011 and 2017 were analyzed. RESULTS During the median follow‑up of 31 months (interquartile range, 17-52 months), 153 patients died (33.9%) and 140 had appropriate interventions (31%). In a multivariate Cox regression analysis, implantation for secondary prevention (hazard ratio [HR], 2.49; P

Background: Short periods of cerebral ischaemia during ventricular defibrillation testing may be associated with neuropsychological impairment. However, the impact of out-of-hospital ventricular fibrillation (VF) converted by implantable cardioverter-defibrillator (ICD) shock on cognitive functioning is unknown. Aim: To assess the impact of out-of-hospital VF converted by ICD shock on cognitive functioning. Methods: The study included 52 primary prevention ICD recipients. Patients with a history of stroke or other neurological impairment, previous head injury and individuals unable to see or speak to complete neuropsychological tests were not included.Initially, a Mini-Mental State Examination was performed in all patients and one patient with a result below 24 points was excluded from the study. The cognitive battery consisted of four tests (six measurements): 1) the Digit Span subtest of Wechsler Adult Intelligence Scale-Revised; 2) the Digit Symbol subtest of Wechsler Adult Intelligence Scale-Revised; 3) the Halstead-Reitan Trail-Making Test A and B; and 4) the Ruff Figural Fluency Test. Results: The mean time from ICD implantation to cognitive assessment was 26 months. During this period, 15 appropriate shocks for VF were observed in seven (14%) patients. The patients with appropriate ICD therapy were significantly worse intwo out of the six neuropsychological measurements and had a significantly lower aggregate result. In multivariate linear regression analysis, defibrillation therapy was an independent factor of poor cognitive functioning, along with age and education. Conclusions: Short periods of out-of-hospital VF converted by ICD are associated with cognitive impairment in the recipients of primary prevention ICD.

Background: Several clinical and experimental studies have shown that unnecessary right ventricular pacing in sinus node disease can be detrimental. Inter- and intra-ventricular asyn­chrony imposed by right ventricular pacing may cause reduction in contractility and relaxation of left ventricle, worsening mitral regurgitation, regional redistribution of myocardial perfusion and oxygen consumption, and asymmetrical hypertrophy of left ventricular wall. In some patients, sinus node disease coexists with impaired atrioventricular conduction. The optimal pacing mode in this population is not determined. Minimizing right ventricular pacing can preserve inter- and intra-ventricular synchrony. On the other hand, longer atrioventricular delay may cause atrioventricular asynchrony. The aim of this study was to prospectively assess the impact of minimizing right ventricular pacing in patients with DDD pacemaker implanted for sinus node disease and prolonged PQ interval on exercise capacity, cardiac function and quality of life. Methods: The study enrolled 50 consecutive patients with prolonged PQ interval who were implanted with DDD pacemaker because of sinus node disease. Each patient was treated alternately with 2 pacing modes in random order for 4-month periods: conventional dualchamber pacing and dual-chamber minimal ventricular pacing (prolonged atrioventricular delay). At the end of each phase the following tests were performed: cardiopulmonary exercise testing, echocardiographic evaluation and quality of life assessment (SF36). Results: There was no significant relationship between pacing mode and cardiopulmonary parameters, echocardiographic parameters and quality of life. Conclusions: Sequential atrioventricular pacing may be a reasonable choice for treating patients with sinus node disease and prolonged PQ interval.

Exercise oscillatory ventilation (EOV) is a common pattern of breathing in heart failure (HF) patients, and indicates a poor prognosis.To investigate the effects of adaptive servoventilation (ASV) on ventilatory response during exercise.We studied 39 HF patients with left ventricular ejection fraction (LVEF) £ 45. Cardiorespiratory polygraphy, cardiopulmonary exercise testing (CPET), echocardiography, and measurement of N-terminal pro-brain natriuretic peptide (NT-proBNP) concentration were performed. Twenty patients with Cheyne-Stokes respiration and apnoea-hypopnoea index (AHI) ≥ 15/h were identified. Of these, 11 patients were successfully titrated on ASV and continued therapy. In the third month of ASV treatment, polygraphy, CPET, echocardiography, and measurement of NT-proBNP concentration were performed again.The EOV was detected at baseline in 12 (31%) HF patients, including eight (67%) who underwent ASV. The EOV was associated with significantly lower LVEF, peak oxygen uptake (VO(2)), and ventilatory anaerobic threshold (VAT), and a significantly higher left ventricular diastolic diameter (LVDD), slope of ventilatory equivalent for carbon dioxide (VE/VCO(2)), AHI, central AHI and NT-proBNP concentration. In seven patients with EOV, reversal of EOV in the third month of ASV therapy was observed; only in one patient did EOV persist (p = 0.0156).The EOV can be reversed with ASV therapy. The EOV in association with central sleep apnoea and Cheyne- -Stokes respiration (CSA/CSR) is prevalent in HF patients and correlates with severity of the disease.

Identification of individual factors associated with high defibrillation threshold (DFT) seems to be of high clinical importance. Impedance cardiography (ICG) may be used for non-invasive evaluation of the haemodynamic status. Whether ICG parameters may improve identification of patients with high DFT has not yet been examined.To evaluate clinical risk factors of high DFT including ICG parameters.The study group included 69 patients with heart failure (aged 62.7 ± 9.5 years, NYHA class: I-III) selected for implantation of a cardioverter-defibrillator (ICD). Clinical assessment included physical examination, echocardiography and ICG monitoring before and after defibrillation.Initial defibrillation was unsuccessful in 17 (36.6%) patients. High DFT group was characterised by higher left ventricular end-diastolic diameter (LVEDD ≥ 5.6 cm: 100.0% vs 70.2%; p = 0.01), lower left ventricular ejection fraction (LVEF30%: 76.5% vs 44.7%; p = 0.024), higher baseline thoracic fluid content (one of ICG parameters) (TFC ≥ 35 1/kOhm: 29.4% vs 6.4%; p = 0.014) and more frequent amiodarone treatment (41.2% vs 14.9%; p = 0.025). A proposed algorithm based on predefined values of TFC, LVEF and LVEDD was shown to be effective in predicting high DFT (area under curve: 0.771).Risk factors of high DFT include left ventricular enlargement, low LVEF, high TFC and amiodarone treatment. An algorithm including TFC measurement by ICG increases the efficacy of identification of patients with high DFT.

Inappropriate implantable cardioverter defibrillator (ICD) therapy is the commonest adverse event in patients with ICD. We present a case of sinus rhythm restoration after an inappropriate shock in a man with permanent atrial fibrillation and dilated cardiomyopathy. During follow-up, clinical improvement has been observed.

Of this study was to assess the serum homocysteine concentration in subjects with acute myocardial infarction and its correlation with the course of infarction and further prognosis considering particularly left ventricle dysfunction, heart rate and conduction disorders as well as to assess the usefulness of metionin load test as a prognostic test in patients with myocardial infarction.66 patients were studied: 36 with recent myocardial infarction and 30 healthy individuals as a control group. Fasting serum homocysteine and its concentration two hours after metionin load were determined in all patients. They all underwent echocardiographic examination, stress test and 24-hour Holter monitoring. The study revealed a significant positive correlation between increased serum homocysteine concentration in patients with myocardial infarction and worsening of contractility parameters, extent of infarction area, and negative correlation between homocysteine concentration and ejection fraction.On the basis of the study outcome we can make a statement that increased homocysteine concentration in patients with acute phase of myocardial infarction indicates its more severe course, more extensive disorders of myocardium kinetics, more significant left ventricle diastolic and systolic dysfunction. Increased serum homocysteine in metionin load test indicates higher death risk in patients with myocardial infarction.