Table 5. Follow-up measures of PPM implantation after HTX.

Parameter	All PPM (n=36)	Early PPM (n=12)	Late PPM (n=24)	P value
Baseline after implantation
Pacing (%)
RA lead, mean ± SD	16.4±22.7	8.0±4.8	20.9±26.9	0.04*
RV lead, mean ± SD	34.8±38.0	19.4±21.5	42.5±41.9	0.04*
Stimulation threshold (V at 0.4 ms)
RA lead, mean ± SD	0.9±0.3	0.9±0.3	0.9±0.3	0.86
RV lead, mean ± SD	0.7±0.2	0.8±0.3	0.7±0.2	0.45
Sensitivity (mV)
RA lead, mean ± SD	2.2±1.6	2.4±1.6	2.2±1.6	0.75
RV lead, mean ± SD	10.4±4.0	11.0±4.2	10.0±3.8	0.51
Impedance (Ù)
RA lead, mean ± SD	493.7±103.8	495.8±74.3	492.5±116.7	0.92
RV lead, mean ± SD	577.7±104.0	569.7±125.9	581.7±90.8	0.78
At 6-month follow-up
Pacing (%)
RA lead, mean ± SD	20.4±28.6	2.0±1.7	25.0±30.2	<0.01*
RV lead, mean ± SD	27.8±40.9	0.5±0.8	34.0±43.0	<0.01*
Stimulation threshold (V at 0.4 ms)
RA lead, mean ± SD	1.0±0.3	0.9±0.3	1.0±0.3	0.69
RV lead, mean ± SD	0.7±0.2	0.7±0.2	0.7±0.2	0.64
Sensitivity (mV)
RA lead, mean ± SD	2.4±1.9	2.6±1.6	2.2±1.8	0.66
RV lead, mean ± SD	9.7±3.5	10.4±1.5	9.5±3.8	0.43
Impedance (Ù)
RA lead, mean ± SD	460.4±87.0	436.6±79.6	466.4±87.7	0.53
RV lead, mean ± SD	557.1±117.4 Ù	512.4±121.0	567.2±114.2	0.44
At 24-month follow-up
Pacing (%)
RA lead, mean ± SD	18.0±27.5	1.3±1.1	21.9±29.2	0.03*
RV lead, mean ± SD	37.6±46.5	0.3±0.3	45.6±47.5	<0.01*
Stimulation threshold (V at 0.4 ms)
RA lead, mean ± SD	1.0±0.3	1.2±0.3	1.0±0.3	0.43
RV lead, mean ± SD	0.7±0.2	0.6±0.1	0.7±0.2	0.54
Sensitivity (mV)
RA lead, mean ± SD	2.2±1.5	2.1±0.8	2.2±1.6	0.90
RV lead, mean ± SD	10.1±3.8	10.6±0.8	10.0±4.2	0.63
Impedance (Ù)
RA lead, mean ± SD	445.8±78.0	453.0±58.4	435.2±62.8	0.72
RV lead, mean ± SD	568.5±145.5	560.0±127.8	570.3±149.0	0.92

*, statistically significant (P<0.05). HTX, heart transplantation; PPM, permanent pacemaker; RA, right atrium; RV, right ventricle; SD, standard deviation.