Breakdown Performance and Partial Discharge Development in Transformer Oil-Based Metal Carbide Nanofluids.

In this work, the influence of semi-conductive SiC nanoparticles on the AC breakdown voltage and partial discharge development in natural ester oil FR3 is examined. Primarily, the dielectric constant and the electrical conductivity of the nanoparticles are measured following the broadband dielectric spectroscopy technique. The nanoparticles are added into the matrix following the ultrasonication process in three weight percentage ratios in order for their effect to be evaluated as a function of their concentration inside the base oil.

Cardiac amyloidosis and Brugada-like ECG pattern.

The Brugada syndrome is an inherited channelopathy associated with a high propensity of ventricular tachyarrhythmias and sudden cardiac death in individuals with structurally normal hearts. Recent data are indicative of mild structural changes, mainly involving the right ventricle, in patients with Brugada syndrome. We present the case of a patient with cardiac amyloidosis due to multiple myeloma who presented with pre-syncopal episodes and intermittent Brugada-like ECG pattern.

ECG findings of acute myocardial infarction and atrioventricular block during a transseptal procedure for left atrial ablation.

We report on a patient with transient atrioventricular block and ST-segment elevation mimicking the ECG of myocardial infarction during transseptal puncture for radiofrequency catheter ablation of atrial fibrillation. Symptoms and EGG findings resolved spontaneously. A neurally-mediated mechanism, activated by the mechanical effects of the transseptal puncture on the interatrial septum and leading to coronary artery spasm, may be considered as a possible explanation of this phenomenon.