TABLE 3.
Myocardial fibrosis and connective tissue thickness
| Baseline | Chronic paced | P value | |
|---|---|---|---|
| Left atrium | |||
| Myocardial fibrosis | |||
| LAA (%) | 14.4 ± 5.4 | 20.7 ± 3.6 | .017 |
| LAFW (%) | 14.5 ± 6.2 | 20.6 ±2.1 | .020 |
| LAPW (%) | 17.1 ± 5.9 | 25.6 ± 2.0 | .013 |
| LAR (%) | 18.9 ± 7.4 | 25.8 ± 2.0 | .024 |
| LIPV (%) | 15.7 ± 4.7 | 29.6 ± 4.6 | <.001 |
| LSPV (%) | 15.9 ± 4.1 | 29.2 ± 4.6 | <.001 |
| RIPV (%) | 14.4 ± 5.0 | 25.6 ± 4.3 | <.001 |
| RSPV (%) | 16.2 ± 5.3 | 25.6 ± 3.7 | .001 |
| Epicardial thickness | |||
| LAA (mm) | 0.150 ± 0.089 | 0.150 ± 0.067 | .991 |
| LAFW (mm) | 0.110 ± 0.029 | 0.161 ± 0.051 | .028 |
| LAPW (mm) | 0.128 ± 0.142 | 0.139 ± 0.104 | .880 |
| LAR (mm) | 0.149 ± 0.093 | 0.176 ± 0.126 | .632 |
| LIPV (mm) | 0.187 ± 0.156 | 0.164 ±0.119 | .472 |
| LSPV (mm) | 0.169 ± 0.153 | 0.119 ± 0.090 | .472 |
| RIPV (mm) | 0.152 ± 0.136 | 0.130 ± 0.086 | .717 |
| RSPV (mm) | 0.135 ± 0.072 | 0.960 ± 0.069 | .302 |
| Endocardial Thickness | |||
| LAA (mm) | 0.048 ± 0.019 | 0.054 ± 0.023 | .564 |
| LAFW (mm) | 0.052 ± 0.024 | 0.055 ± 0.024 | .803 |
| LAPW (mm) | 0.091 ± 0.053 | 0.164 ± 0.080 | .049 |
| LAR (mm) | 0.160 ± 0.126 | 0.191 ± 0.066 | .542 |
| LIPV (mm) | 0.097 ± 0.062 | 0.127 ± 0.054 | .112 |
| LSPV (mm) | 0.72 ± 0.042 | 0.105 ± 0.035 | .112 |
| RIPV (mm) | 0.080 ± 0.038 | 0.153 ± 0.046 | .005 |
| RSPV (mm) | 0.083 ± 0.052 | 0.126 ± 0.050 | .104 |
| Right atrium | |||
| Myocardial fibrosis | |||
| RAA (%) | 11.7 ± 2.3 | 24.0 ± 4.5 | <.001 |
| RAFW (%) | 12.2 ± 4.8 | 22.6 ± 5.3 | .001 |
| Epicardial thickness | |||
| RAA (mm) | 0.206 ± 1.119 | 0.187 ± 0.119 | .757 |
| RAFW (mm) | 0.146 ±0.114 | 0.174 ± 0.088 | .59 |
| Endocardial Thickness | |||
| RAA (mm) | 0.024 ± 0.008 | 0.041 ± 0.011 | .003 |
| RAFW (mm) | 0.020 ± 0.007 | 0.027 ± 0.007 | .173 |
| Left ventricle | |||
| LV (%) | 9.3 ± 4.8 | 8.8 ± 3.18 | .799 |
| LV epi thickness (mm) | 0.135 ± 0.070 | 0.102 ± 0.047 | .299 |
| LV endo thickness (mm) | 0.068 ± 0.043 | 0.094 ± 0.035 | .208 |
LAA, Left atrial appendage; LAFW, left atrial free wall; LAPW, left atrial posterior wall; LAR, left atrial roof; LIPV, left inferior pulmonary vein; LSPV, left superior pulmonary vein; RIPV, right inferior pulmonary vein; RSPV, right superior pulmonary vein; RAA, right atrial appendage; RAFW, right atrial free wall; LV, left ventricle; LV Epi, left ventricular epicardial; LV Endo, left ventricular endocardial.