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  • Title: The effects of epimysial electrode location on phrenic nerve recruitment and the relation between tidal volume and interpulse interval.
    Author: Schmit BD, Mortimer JT.
    Journal: IEEE Trans Rehabil Eng; 1999 Jun; 7(2):150-8. PubMed ID: 10391585.
    Abstract:
    Electrode location is of vital importance to diaphragm pacing devices using electrodes implanted on the diaphragm. Complete phrenic nerve recruitment with a single epimysial electrode implanted on the abdominal surface of the diaphragm required placement within 1 cm of the motor point. Recruitment could be increased further using multiple electrodes, provided the electrodes were implanted on opposite sides of the phrenic nerve motor point. The location of the implanted electrode relative to the phrenic nerve motor point also affected the relation between the stimulus interpulse interval (IPI) and the measured tidal volume. Specifically, we found that electrodes implanted lateral to the phrenic nerve motor point had different tidal volume--IPI relations than electrodes placed anterior or posterior to the motor point. We concluded that properly placed epimysial electrodes are required to obtain adequate phrenic nerve recruitment for full time ventilation and knowledge of the relative location of the electrode with respect to motor point is necessary to predict the tidal volume produced by a specific IPI.
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