TABLE 3.

Preoperative risk factors associated with greater (worse) postoperative MPI

Factor	Estimate ± SE	P value	Reliability (%)*
Overall
Greater preoperative TR			100
1+vs 0	0.098 ± 0.022	<.0001
2+vs 0	0.16 ± 0.024	<.0001
3+/4+vs 0	0.12 ± 0.036	.0009
History of COPD	0.12 ± 0.027	<.0001	95
Higher heart rate†	0.034 ± 0.019	.07	50
Older age‡	0.038 ± 0.015	.01	88
Larger LA volume index§	0.039 ± 0.018	.03	85
Lower MR	−0.059 ± 0.028	.03	42
TV procedure	0.036 ± 0.032	.3
Early phase
History of hypertension	0.033 ± 0.016	.04	42
Greater mean systemic arterial pressure‖	−6.7 ± 4.02	.09	58
Greater preoperative MPI¶	0.055 ± 0.028	.05	58
Late phase
None

COPD, Chronic obstructive pulmonary disease; LA, left atrial; MPI, myocardial performance index; MR, mitral regurgitation; SE, standard error; TR, tricuspid regurgitation; TV, tricuspid valve.

^*Percentage of times factor appeared in 500 bootstrap models.

^†(75/heart rate), inverse transformation.

^‡(Age/50)², squared transformation.

^§Ln(LA volume index), natural logarithmic transformation.

^‖(1/mean arterial pressure), inverse transformation.

^¶MPI², squared transformation.