Relevance of subclinical right ventricular dysfunction measured by feature-tracking cardiac magnetic resonance in non-ischemic dilated cardiomyopathy.

BACKGROUND: Right ventricular (RV) dysfunction in patients with non-ischemic dilated cardiomyopathy (NICM) is associated with cardiovascular events. To analyze the feasibility of assessing RV myocardial deformation by feature tracking (FT)-cardiac magnetic resonance (CMR), and its usefulness as a prognostic marker. METHODS: Retrospective study of NICM patients undergoing CMR. Longitudinal FT-RV free wall (LFT-RVFW) and fractional area change (FAC) were obtained. Correlation with standard RV parameters was studied. An association with combined event (heart failure (HF), ICD implantation or cardiovascular death) was assessed using a logistic regression model. RESULTS: 98 patients (64 ± 13 years) were included. Left ventricular (LV) systolic function (LVEF 29.5 ± 9.6%, 47% with LVEF ≥ 30%) and RV (RVEF 52.2 ± 14.6%, 72% with RVEF ≥ 45%). Follow-up of 38 ± 17 months, 26.5% presented at least one admission for HF. An excellent correlation of LFT-RVFW (r = 0.82) and FAC (r = 0.83) with RVEF was evident. No association of RV-FT parameters with prognosis entire study population was found. However, in patients with LVEF ≥ 30%, admissions for HF were associated with lower LFT-RVFW (-21.6 ± 6.6% vs -31.3 ± 10%; p = 0.006) and FAC (36.6 ± 9.6% vs 50.5 ± 13.4%; p < 0.001) values. Similar differences were observed when only patients with RVEF ≥ 45% were considered. An LFT-RVFW cut-off point of -19.5% and FAC of 36.5% showed good prognostic performance. Decreased LFT-RVFW or FAC represented an independent predictor of combined event in patients with LVEF ≥ 30%. CONCLUSIONS: In NICM patients without severe LV dysfunction, decreased values of LFT-RVFW and/or FAC were associated with HF admissions, independently of RVEF.

Gasto sanitario público y mortalidad por COVID-19 en España y en Europa / Public healthcare expenditure and COVID-19 mortality in Spain and in Europe

Objetivo Analizar la asociación entre el gasto sanitario público per cápita y la tasa de mortalidad poblacional por COVID-19 en Europa y en España. Material y métodos Se utilizó el coeficiente de correlación de Pearson. Asimismo, se contrastaron los promedios de TMP-COVID-19 entre países y comunidades autónomas con mayor y menor GSPpc que el promedio. Resultados No se halló correlación, en los países europeos, entre el gasto sanitario público per cápita y la tasa de mortalidad poblacional por COVID-19 (r: 0,3; p = 0,14), ni en las comunidades autónomas (r: 0,03; p = 0,91). Tampoco se encontraron diferencias significativas en el contraste de la tasa de mortalidad poblacional por COVID-19 por grupos de gasto sanitario público per capita. Conclusiones La asociación entre «bajo» gasto sanitario público y malos resultados en España en la crisis de la COVID-19 no está sustentada en la evidencia disponible. Los aumentos de financiación de la sanidad pública deberían destinarse a las reformas estructurales para aumentar su eficiencia social (AU)

Objective To analyze the association between public health expenditure per capita and the mortality rate due to COVID-19 in Europe and Spain. Material and methods Pearson's correlation coefficient was used to compare and contrast the mortality rate due to COVID-19 between countries and autonomous communities with higher and lower public health expenditure per capita than the mean. Results No correlation between the public health expenditure per capita and the mortality rate due to COVID-19 (r: 0.3; p = 0.14) was found among European countries or Spain's Autonomous Communities (r: 0.03; p = 0.91). No significant differences were found when comparing the mortality rate due to COVID-19 among the public health expenditure per capita groups. Conclusions The available evidence does not support association between «low» public healthcare expenditure and the poor outcomes observed in Spain during the COVID-19 pandemic. Increased funding for the Spanish National Health System should be earmarked for structural reforms to increase its social efficiency (AU)

Public healthcare expenditure and COVID-19 mortality in Spain and in Europe.

OBJECTIVE: To analyze the association between public health expenditure per capita and the mortality rate due to COVID-19 in Europe and Spain. MATERIAL AND METHODS: Pearson's correlation coefficient was used to compare and contrast the mortality rate due to COVID-19 between countries and autonomous communities with higher and lower public health expenditure per capita than the mean. RESULTS: No correlation between the public health expenditure per capita and the mortality rate due to COVID-19 (r: 0.3; p = 0.14) was found among European countries or Spain's Autonomous Communities (r: 0.03; p = 0.91). No significant differences were found when comparing the mortality rate due to COVID-19 among the public health expenditure per capita groups. CONCLUSIONS: The available evidence does not support association between «low¼ public healthcare expenditure and the poor outcomes observed in Spain during the COVID-19 pandemic. Increased funding for the Spanish National Health System should be earmarked for structural reforms to increase its social efficiency.

[Public healthcare expenditure and COVID-19 mortality in Spain and in Europe]. / Gasto sanitario público y mortalidad por COVID-19 en España y en Europa.

OBJECTIVE: To analyze the association between public health expenditure per capita and the mortality rate due to COVID-19 in Europe and Spain. MATERIAL AND METHODS: Pearson's correlation coefficient was used to compare and contrast the mortality rate due to COVID-19 between countries and autonomous communities with higher and lower public health expenditure per capita than the mean. RESULTS: No correlation between the public health expenditure per capita and the mortality rate due to COVID-19 (r: 0.3; p = 0.14) was found among European countries or Spain's Autonomous Communities (r: 0.03; p = 0.91). No significant differences were found when comparing the mortality rate due to COVID-19 among the public health expenditure per capita groups. CONCLUSIONS: The available evidence does not support association between «low¼ public healthcare expenditure and the poor outcomes observed in Spain during the COVID-19 pandemic. Increased funding for the Spanish National Health System should be earmarked for structural reforms to increase its social efficiency.

A novel device based on smart textile to control heart's activity during exercise.

In recent years, several systems have been developed to control cardiac function during exercise, and some are also capable of recording RR data to provide heart rate variability (HRV) analyses. In this study we compare time between heart beats and HRV parameters obtained with a smart textile system (GOW; Weartech sl., Spain) and an electrocardiogram machine commonly used in hospitals during continuous cycling tests. Twelve cardiology patients performed a 30-min cycling test at stable submaximal intensity. RR interval data were recorded during the test by both systems. 3-min RR segments were taken to compare the time intervals between beats and HRV variables using Bland-Altman analyses and intraclass correlation coefficients. Limits of agreement (LoAs) on RR intervals were stable at around 3 ms (widest LoAs -5.754 to 6.094 ms, tightest LoAs -2.557 to 3.105 ms, medium LoAs -3.638 ± 0.812 to 3.145 ± 0.539 ms). HRV parameters related to short-term change presented wide LoAs (RMSSD -0.17 to 18.41 %, HF -17.64 to 33.21 %, SD1 -0.50 to 17.54 %) as an effect of the error measurement of the GOW system. The GOW system is a valid tool for controlling HR during physical activity, although its use as a clinical tool for HRV cannot be supported.

Quantification of anaesthetic effects on atrial fibrillation rate by partial least-squares.

The mechanism underlying atrial fibrillation (AF) remains poorly understood. Multiple wandering propagation wavelets drifting through both atria under hierarchical models are not understood. Some pharmacological drugs, known as antiarrhythmics, modify the cardiac ionic currents supporting the fibrillation process within the atria and may modify the AF propagation dynamics terminating the fibrillation process. Other medications, theoretically non-antiarrhythmic, may slightly affect the fibrillation process in non-defined mechanisms. We evaluated whether the most commonly used anaesthetic agent, propofol, affects AF patterns. Partial least-squares (PLS) analysis was performed to reduce significant noise into the main latent variables to find the differences between groups. The final results showed an excellent discrimination between groups with slow atrial activity during the propofol infusion.

Entropy measurements in paroxysmal and persistent atrial fibrillation.

Recent studies on atrial fibrillation (AF) have identified different activation patterns in paroxysmal and persistent AF. In this study, bipolar intra-atrial registers from 28 patients (14 paroxysmal AF and 14 persistent AF) were analyzed in order to find out regional differences in the organization in both types of arrhythmias. The organization of atrial electrical activity was assessed in terms of nonlinear parameters, such as entropy measurements. Results showed differences between the atrial chambers with a higher disorganization in the left atrium in paroxysmal AF patients and a more homogenous behavior along the atria in persistent AF patients.

Ventricular rhythm in atrial fibrillation under anaesthetic infusion with propofol.

Changes in patients' autonomic tone and specific pharmacologic interventions may modify the ventricular response (actual heart rate) during atrial fibrillation (AF). Hypnotic agents such as propofol may modify autonomic balance as they promote a sedative state. It has been shown that propofol slightly slows atrial fibrillatory activity, but the net global effect on the ventricular response remains unknown. We aimed to evaluate in patients in AF the effect of a propofol bolus on the ventricular rate and regularity at ECG. We analysed the possible relation with local atrial fibrillatory activities, as ratios between atrial and ventricular rates (AVRs), analysing atrial activity from intracardiac electrograms at the free wall of the right and left atria and at the interatrial septum. We compared data at the baseline and after complete hypnosis. Propofol was associated with a more homogeneous ventricular response and lower AVR values at the interatrial septum.

Cooled ablation reduces pulmonary vein isolation time: results of a prospective randomised trial.

BACKGROUND: Currently, selection of the ablation catheter for pulmonary vein (PV) isolation is a matter of choice. OBJECTIVE: To evaluate the efficiency of cooled ablation for PV isolation. METHODS: A prospective randomised trial was carried out comparing the time required to disconnect each targeted PV using cooled ablation (open irrigation at 15 ml/min, group A) or standard temperature-controlled 4 mm tip catheter ablation (group B). The ablation parameter limit settings were 45 degrees C, 35 (5) W in group A, and 55 degrees C, 35 (5) W in group B. RESULTS: Thirty-six patients referred for a first atrial fibrillation (AF) ablation procedure were randomised to group A or group B (18 patients in each group). There were no significant differences in baseline characteristics between the groups. Bidirectional block was achieved in 61/61 PVs from group A (100%) and 59/61 PVs from group B (97%); p = NS. Time to PV disconnection was significantly shorter in group A than in group B (median (25th-75th centiles) 14 (5-28) min vs 19 (14-32) min, respectively; p = 0.003). Five asymptomatic PV stenoses were identified by MRI, all in group B (p = 0.05). After 1-year minimum follow-up, AF recurrences were less frequently documented in patients treated with cooled ablation (6% vs 33%; p = 0.05). CONCLUSION: Cooled ablation is more efficient than standard ablation in achieving PV isolation. Results obtained from this study also suggest a potential benefit of clinical efficacy and safety from cooled ablation, which should be further evaluated in larger clinical trials.

Anesthesia with propofol slows atrial fibrillation dominant frequencies.

The mechanisms responsible for the maintenance of atrial fibrillation (AF) are not completely understood yet. It has been demonstrated that AF can be modulated by several cardiac diseases, the autonomic nervous system and even drugs with purportedly no antiarrhythmic properties. We evaluated the effects of a widely used anaesthetic agent (propofol) in the fibrillation patterns. Spectral analysis was performed over atrial electrograms at baseline and immediately after a propofol bolus. Only after performing principal component analysis (PCA), we were able to significantly detect that propofol slows AF.

Determinants of inducibility of ventricular tachycardia.

We analyzed the incidence and predictive factors for induction of clinical ventricular tachycardia (VT) during an electrophysiologic study in 127 patients with structural heart disease and spontaneous VT documented by 12-lead electrocardiography. Eighty-five patients had coronary artery disease (CAD), 24 had idiopathic dilated cardiomyopathy (IDC), and 18 had right ventricular dysplasia (RVD). Clinical variables were age, gender, electrocardiographic patterns of spontaneous arrhythmia, cardiac diagnosis, left ventricular (LV) ejection fraction (EF), infarct location, and presence of LV aneurysm. Clinical VT was induced in 76 patients (60%, group 1) and was not induced in 51 patients (group 2). Clinical VT was induced in 83% of patients with RVD, 58% of patients with CAD, and 50% of patients with IDC (p = 0.07). LVEF tended to be significantly higher in group 1 than in group 2 (p = 0.06). The presence of left QRS axis in the frontal plane during spontaneous VT was significantly associated with a higher inducibility both in the general group (69% vs 46%, p <0.02) and in patients with CAD (70% vs 44%, p <0.02). In patients with CAD, only the presence of a left QRS axis was significantly associated with a higher inducibility. A multivariate analysis identified only the left QRS axis as a significant and independent predictor of induction of clinical VT. The association of a leftward axis with inducibility suggests that vectorial factors in the depolarization wavefronts may be related to inducibility since conventional stimulation is performed from the right ventricle, producing a leftward axis in most cases.

[Sudden cardiac death out of the hospital and early defibrillation]. / Muerte súbita cardíaca extrahospitalaria y desfibrilación precoz.

Since most sudden cardiac death victims show neither symptoms before the event nor other signs or risk factors that would have identified them as a high risk population before their cardiac arrest, emergency out-of-hospital medical services must be improved in order to obtain a higher survival in these patients. Early defibrillation is an essential part of the chain of survival that also includes the early identification of the victim, activation of the emergency medical system, immediate arrival of trained personnel who can perform basic cardiopulmonary resuscitation and early initiation of advanced cardiac life support that would raise the survival rate for sudden cardiac arrest victims. Many studies have demonstrated the enormous importance of early defibrillation in patients with a cardiac arrest due to ventricular fibrillation. The most important predictor of survival in these individuals is the time that elapses until electric defibrillation, the longer the time to defbrillation the lower the number of patients who are eventually discharged. Multiple studies have demonstrated that automatic external defibrillation will reduce the time elapsed to defibrillation and thus improve survival. For these reason, public access defibrillation to allow the use of automatic external defibrillators by minimally trained members of the lay public, has received increasing interest on the part of a groving number of companies, cities or countries. The automatic external defibrillaton, as performed by a lay person is being investigated. The liberalization of its application, if is demonstrated to be effective, will need to be accompanied by legal measures to endorse it and appropriate health education, probably during secondary education.