TABLE 3.
Variables included in the multivariable analysis for a high cumulative amount of energy administered (> 600 J), based on 218 successful TVEC procedures
| Variables | Level | N (including imputed values) | N (excluding missing data values) | OR | 95% CI | P‐value |
|---|---|---|---|---|---|---|
| Height at the withers | 218 | 218 | 1.04 | 0.99‐1.10 | .08 | |
| Body weight | 218 | 208 | 1.008 | 1.003‐1.014 | .003 | |
| Sex | Mare | 69 | 69 | Reference | ||
| Stallion | 29 | 29 | 0.43 | 0.155‐1.20 | .11 | |
| Gelding | 120 | 120 | 0.41 | 0.213‐0.80 | .009 | |
| Previous AF episode | None | 195 | 195 | Reference | ||
| 1 or more | 23 | 23 | 2.76 | 1.23‐6.18 | .01 | |
| R‐AFCL | 218 | 200 | 0.981 | 0.965‐0.998 | .02 | |
| LA dilation | No | 168 | 168 | Reference | ||
| Yes | 50 | 50 | 1.70 | 0.86‐3.38 | .13 | |
| RA dilation | No | 173 | 173 | Reference | ||
| Yes | 45 | 45 | 1.61 | 0.79‐3.28 | .19 | |
| MR | No | 115 | 115 | Reference | ||
| Yes | 103 | 103 | 1.55 | 0.84‐2.86 | .16 | |
| MR grade | None | 115 | 115 | Reference | ||
| Mild | 74 | 74 | 1.84 | 0.96‐3.53 | .07 | |
| Moderate | 29 | 29 | 0.94 | 0.345‐2.56 | .9 | |
| TR | No | 119 | 119 | Reference | ||
| Yes | 99 | 99 | 2.09 | 1.13‐3.87 | .02 | |
| TR grade | None | 119 | 119 | Reference | ||
| Mild | 70 | 70 | 1.56 | 0.78‐3.12 | .21 | |
| Moderate | 29 | 29 | 3.90 | 1.65‐9.2 | .002 | |
| PR grade | None | 202 | 202 | Reference | ||
| Mild | 12 | 12 | 0.249 | 0.031‐1.98 | .19 | |
| Moderate | 4 | 4 | 0.914 | 0.093‐9.0 | .94 | |
| Sotalol premedication | No | 178 | 178 | Reference | ||
| Yes | 40 | 40 | 0.191 | 0.056‐0.647 | .008 | |
| Year of conversion | 218 | 218 | 0.79 | 0.72‐0.88 | <.001 | |
| Catheter type | Type A | 54 | 54 | Reference | ||
| Type B | 164 | 164 | 0.170 | 0.086‐0.334 | <.001 | |
| Depth of the PA catheter | 218 | 196 | 0.92 | 0.87‐0.98 | .005 | |
| Impedance | 218 | 206 | 1.09 | 1.04‐1.13 | <.001 |
Abbreviations: 95% CI, 95% confidence interval; AF, atrial fibrillation; LA, left atrium; MR, mitral regurgitation; N, number of TVEC procedures; OR, odds ratio; PA, pulmonary artery; PR, pulmonary regurgitation; RA, right atrium; R‐AFCL, atrial fibrillation cycle length in the right atrium; TR, tricuspid regurgitation; TVEC, transvenous electrical cardioversion.