Does the interventional cardiologist have to manually give the two saline injections and calculate the cross-sectional area?
Dr. Kassab: No, the entire process is automated. Once the cardiologist places the catheter or guide wire in the desired vessel, the catheter is connected to the LumenRECON system. The system is loaded with pre-packaged, sterile solutions of 0.5% and 1.5% NaCl. A push of a button will heat the solutions to body temperature. The machine will flash a ready signal and the push of a second button will initiate the injections. The rest of the process is automatic. An internal pump delivers each of the two injections in turn through a side hole for the catheter or through a guide catheter for the wire. The impedance module will record the voltages for each injection and a processor will calculate both the CSA and parallel conductance due to the surrounding tissue. The two parameters will be displayed on the monitor. If a pullback reconstruction is desired, a longer injection can be made and the catheter can be pulled back at constant speed. The pullback can be motorized. The CSA along the len
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