RESUMEN
A novel beamformer architecture using fractional delay filters is proposed and verified through experiments. By performing interchannel summation prior to filtering operation in the manner producing no error, the proposed architecture requires only three four-tap filters for the whole beamformer and four simple demultiplexers per each channel.
Asunto(s)
Algoritmos , Aumento de la Imagen/instrumentación , Interpretación de Imagen Asistida por Computador/instrumentación , Procesamiento de Señales Asistido por Computador/instrumentación , Transductores , Ultrasonografía/instrumentación , Diseño Asistido por Computadora , Diseño de Equipo , Análisis de Falla de Equipo , Interpretación de Imagen Asistida por Computador/métodos , Reproducibilidad de los Resultados , Sensibilidad y Especificidad , Ultrasonografía/métodosRESUMEN
The I-gel™ is a single-use supraglottic airway device introduced in 2007 which features a non-inflatable cuff and allows passage of a tracheal tube owing to its large diameter and short length of the airway tube. In this case, the authors experienced a difficult airway management on a 4-year-old boy with underlying Goldenhar syndrome who underwent a tonsillectomy. Intubation using a laryngoscope was unsuccessful at the first attempt. In the following attempt, we used the I-gel™ supraglottic airway for ventilation and were able to achieve successful intubation with a cuffed tube by using fiberoptic bronchoscope through the I-gel™ supraglottic airway. The authors suggest that I-gel™ is a useful device for ventilation and it has many advantages for tracheal intubation in pediatric patients with difficult airway.
RESUMEN
Bradycardia may occur during spinal anesthesia with atropine commonly used as a treatment. A 44-year-old female with no known history of any underlying diseases, developed a coronary spasm following ventricular tachycardia when 0.5 mg of atropine was injected intravenously to treat bradycardia during spinal anesthesia. The imbalance caused by atropine in the sympathovagal activity may predispose the coronary artery to develop spasms with ventricular tachycardia. Therefore prudent use of atropine should be accompanied by close monitoring.