| http://www.w3.org/ns/prov#value | - In this embodiment, shown in FIG. 21A, the catheter 500 contains one or more sensors 20, positioned to face radially inward, and capable of monitoring substances such as NO, NOx, or glutamate, or other physical or chemical signals, with electronic leads 800 extending from the sensor via the catheter to a monitoring system 520 which is external to the patient.
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