System and method for monitoring bioimpedance and respiration

摘要

A method of treating tissue is provided, including positioning a portion of a catheter in proximity to cardiac tissue; measuring an impedance value with the catheter; determining a respiratory rate based at least in part on the measured impedance value; and thermally treating the cardiac tissue with the catheter.

主权项

1. A medical system for thermally treating cardiac tissue, the system comprising:
a catheter, the catheter including:
a proximal end, a distal end, and a thermally conductive region;a first electrode on the catheter proximal to the thermally conductive region;a second electrode on the catheter proximal to the first electrode; and an impedance measurement system in communication with the catheter, the impedance measurement system being programmed to:
initiate thermal treatment of tissue proximate a phrenic nerve;measure an impedance value;correlate the impedance value to a respiratory status, the respiratory status being a response of the phrenic nerve to the thermal treatment;define a respiratory status threshold value; andterminate the thermal treatment of the tissue when the correlated respiratory status is below the predefined threshold value.