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1 From the Mayo Clinic and Mayo Foundation, Rochester, Minnesota
A combined flushing and pulse-pressure display system for percutaneous catheterization and angiography is easy to assemble, convenient to use, and adds some measure of safety to the procedure. Clotting in the catheter, intramural passage of the catheter tip, or, in the case of selective angiography, wedging of the catheter tip in a branch artery may be detected immediately by observing the oscilloscopic display of the pulse pressure contour and the response to flushing. In addition, the pulse curve serves as a convenient monitor of cardiac rate and rhythm. The oscilloscope may also be used for display of the electro-cardiogram during angiography, if more precise cardiac monitoring is desired.
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