Effects of Injection Site on the Accuracy of Thermal Washout: Methods and Materials (6)
Three successive EFs were calculated within the residual temperature change of more than 20 percent of peak one and displayed on a monitor together with the thermal washout curve, the determined points of end-diastolic plateaus, electrocardiogram, and arterial pressure wave. If any arrhythmia and/or any distorted thermal curves were noted, the data were abandoned. In the model experiment, end-diastolic plateaus in the washout curve were easily determined as the gradual downslope just before rapid temperature change induced by the subsequent stroke, and the mean points of the gradual downslope were adopted as end-diastolic plateaus. Thus, we did not adopt any time derivative of the curve or signals from the artificial heart showing the start of upward movement of the piston. buy cheap antibiotics
Patients: A modified Swan-Ganz catheter (73R9067S, 7.5 French size, Electro-Catheter Corp. Rahway, NJ), which was equipped with three lumens (one connected to the distal end, the second to a side hole 15 cm from the tip, and the third to a side hole 30 cm from the tip), and also a rapid response thermistor (90 percent response time being about 100 ms) was inserted into a pulmonary artery through the internal jugular vein. The position of the catheter was confirmed by recordings of characteristic pressure wave of each of the pulmonary arteries (distal end of the catheter), RV (side hole 15 cm from the distal end), and RA (side hole 30 cm from the distal end).