Table 3. Device Performance Metrics at Implantation and Follow up .

Device Performance metrics from interrogations from those in whom quantitative interrogations were available. BPM=beats per minute; mV=millivolts.

	HD	SD	P-level
At Implantation	(N=132)	(N=22)
Final Pacing Impedance (Ohms)	699 (±196)	768 (±177)	0.127
Final Pacing Capture Threshold (Volts)	0.631 (±0.469)	0.685 (±0.434)	0.620
Pulse Width (milliseconds)	0.329 (±0.216)	0.317 (±0.109)	0.816
Final Sensing Amplitude (in mV)	10.753 (±5.408)	10.996 (±5.554)	0.846
Lower Rate (BPM)	62 (±12)	60 (±12)	0.515
At Follow Up	(N=103)	(N=22)
Follow up Pacing Impedance (Ohms)	614 (±123)	624 (±107)	0.729
Follow up Pacing Capture Threshold (Volts)	0.633 (±0.601)	0.768 (±0.495)	0.328
Pulse Width (milliseconds)	0.31 (±0.09)	0.3 (±0.08)	0.699
Follow up sensing amplitude (mV)	12.625 (±5.778)	13.532 (±7.12)	0.598
Follow Up Lower Rate	62 (±11)	60 (±10)	0.462
Changes from Implantation to Follow Up	(N=98)	(N=19)
Change in Impedance (Ohms)	-98 (±171)	-155 (±100)	0.166
Change in Capture Threshold (Volts)	0.014 (±0.570)	0.016 (±0.227)	0.992
Change in Pulse Width (milliseconds)	-0.018 (±0.263)	-0.015 (±0.127)	0.965
Change in Sensing Amplitude (mV)	2.28 (±4.88)	2.59 (±4.68)	0.802
Change in Impedance (%)	-16.88 (±29.25)	-23.63(±15.06)	0.331
Change in Capture Threshold (%)	-17.78 (±73.69)	-4.98 (±35.93)	0.255
Change in Pulse Width (%)	-15.65 (±105.48)	-10.49 (±44.98)	0.844
Change in Sensing Amplitude (%)	4.59 (±89.11)	2.56 (±69.07)	0.928