Intracardiac phased-array imaging using a 10F catheter was feasible in 24 patients, successfully visualizing prespecified cardiac targets at an average depth of 8.8 cm.
Does a 10F phased-array intracardiac imaging catheter provide feasible high-resolution imaging of cardiac structures in patients undergoing EP studies?
Initial human studies demonstrate the feasibility and utility of a 10F phased-array intracardiac catheter for high-resolution global cardiac imaging and Doppler flow characterization.
OBJECTIVES: This study was designed to test the feasibility of high-resolution phased-array intracardiac imaging. BACKGROUND: Intracardiac echocardiographic imaging of the heart during interventional electrophysiologic (EP) procedures has been limited by inadequate ultrasound penetration and absence of Doppler hemodynamic and flow information produced by rotating mechanical ultrasound elements. METHODS: A 10F (3.2 mm) phased-array, variable 5.5 to 10 MHz frequency imaging catheter with a four-way deflectable tip was applied in 24 patients undergoing EP studies. Sixteen prespecified cardiac targets were imaged from a right heart venue. RESULTS: Fifteen patients had no underlying organic heart disease; nine had ischemic, cardiomyopathic, valvular or congenital heart disorders. Longitudinal and short-axis imaging readily disclosed each cardiac valve, support structures and chamber, as well as the pericardium, right and left atrial appendages, the junction of the right atrium and superior vena cava, crista terminalis, tricuspid valve isthmus, coronary sinus orifice, membranous fossa ovalis and pulmonary veins. The average target depth was 8.8+/-1.5 cm (range 0.5 to 15 cm), with adequate penetration at a 7.5 MHz imaging frequency. Color flow and Doppler utilities clearly characterized transaortic and pulmonic valve and pulmonary vein blood flow, including during low output states. CONCLUSIONS: These first human studies with this technology demonstrate the methods, feasibility and utility of intracardiac phased-array vector and Doppler imaging for long-axis, apex-to-base global cardiac imaging. High resolution of endocardial structures and catheters suggests additional utility for visualizing interventional procedures from the right heart.
Packer et al. (Fri,) conducted a other in Patients undergoing electrophysiologic studies (n=24). 10F phased-array intracardiac imaging catheter was evaluated on Feasibility of high-resolution phased-array intracardiac imaging of 16 prespecified cardiac targets. Intracardiac phased-array imaging using a 10F catheter was feasible in 24 patients, successfully visualizing prespecified cardiac targets at an average depth of 8.8 cm.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: