RESUMO
Congenital heart diseases can be treated without surgery through advances in interventional cardiology. Complications such as infection and thrombus formation may develop due to foreign materials used during these procedures. Paradoxical embolism is a rare complication of transcatheter closure of ventricular septal defect (VSD) and could be responsible for acute myocardial infarction. Herein, we present a case of coronary thrombosis in a 2-year-old patient with VSD, which was closed with the Amplatzer VSD device. Although extremely rare, it should be considered in the appropriate clinical setting.
RESUMO
The detecting mechanism of carbon nanotubes gas sensor based on multi-stable stochastic resonance (MSR) model was studied in this paper. A numerically stimulating model based on MSR was established. And gas-ionizing experiment by adding electronic white noise to induce 1.65 MHz periodic component in the carbon nanotubes gas sensor was performed. It was found that the signal-to-noise ratio (SNR) spectrum displayed 2 maximal values, which accorded to the change of the broken-line potential function. The experimental results of gas-ionizing experiment demonstrated that periodic component of 1.65 MHz had multiple MSR phenomena, which was in accordance with the numerical stimulation results. In this way, the numerical stimulation method provides an innovative method for the detecting mechanism research of carbon nanotubes gas sensor.