The feasibility of using continuous on-line recording of intraventricular electrical impedance to measure ventricular stroke volume was assessed in 12 patients at cardiac catheterization with a multielectrode impedance catheter and a 1.3 kHz measuring current of 4 ,A. Stroke volumes determined by electrical impedance were compared with stroke volumes determined by the thermodilution technique i...

The feasibility of using continuous on-line recording of intraventricular electrical impedance to measure ventricular stroke volume was assessed in 12 patients at cardiac catheterization with a multielectrode impedance catheter and a 1.3 kHz measuring current of 4 ,A. Stroke volumes determined by electrical impedance were compared with stroke volumes determined by the thermodilution technique i...

The feasibility of using continuous on-line recording of intraventricular electrical impedance to measure ventricular stroke volume was assessed in 12 patients at cardiac catheterization with a multielectrode impedance catheter and a 1.3 kHz measuring current of 4 ,A. Stroke volumes determined by electrical impedance were compared with stroke volumes determined by the thermodilution technique i...

The effect of perforation impedance on the acoustic behavior of reactive and dissipative silencers is investigated using experimental and computational approaches. The boundary element method (BEM) is applied for the prediction of transmission loss of silencers with different perforation geometries. The variations are considered in the porosity (8.4 and 25.7%) and hole diameter (0.249 and 0.498...

The ultrasonic velocity (U), density (ρ) and viscosity (η) measurements have been carried out for L-Methionine in aqueous sodium chloride, potassium chloride and lithium chloride as a function of composition at 303K. Experimental data have been used to estimate the adiabatic compressibility (β), change (∆β) and relative change in adiabatic compressibility (∆β/β°), acoustic impedance (z), limiti...

The feasibility of using continuous on-line recording of intraventricular electrical impedance to measure ventricular stroke volume was assessed in 12 patients at cardiac catheterization with a multielectrode impedance catheter and a 1.3 kHz measuring current of 4 microA. Stroke volumes determined by electrical impedance were compared with stroke volumes determined by the thermodilution techniq...

Recent military conflicts have provided evidence of a new mode of lower extremity injury as a result of under-vehicle blasts. Extreme vehicle design elements have decreased the frequency of hull breech into the occupant compartment, yet catastrophic injuries to the lower extremities continue to occur. Previous studies of shock wave-induced injuries, such as blast lung, have highlighted acoustic...