Table 1.

Automated features of the phrenic nerve pacemaker.

Automated Sensor Feature	Condition (Based on Programmed Thresholds)	Required for Therapy Delivery	Used for Stimulation Amplitude Modulation
Pitch	Recumbent	X	X
Activity	Inactive	X	X
Time of day	Time within typical sleep window	X	X
Lead impedance	Impedance within an acceptable range	X
Respiration	Transthoracic impedance measurements within a preset range		X
Body position	Position tracked within quadrant angles (supine, left, right, prone)		X
Week number	Stimulation amplitude increased over several weeks allows for acclimatization		X

Once required conditions are met, the device automatically increases or decreases stimulation current levels based on information about respiration, body pitch/position, activity, and/or time on therapy.