Factors Influencing Pain Scores and Opioid Demand after Robotically Assisted Cardiac Surgery

Table 4

Univariate correlation of intraoperative variables with pain scores and opioid demand on postoperative day 1.

Variable	Correlation mean pain score	value	Correlation mean OME demand	value
Cardiopulmonary bypass time	0.118	0.311	0.970	0.409
Myocardial ischemic time	−0.233	0.044	0	0.999
Procedure time	0.174	0.135	0.348	0.002
Total incision length	−0.082	0.484	0.077	0.512
	Mean pain score	value	Mean OME demand	value
Conversion to larger incision		0.652		0.316
No	5.8 (SD 1.5)		35.7 (SD 29.4)
Yes	5.4 (SD 0.9)		20.6 (SD 19.8)
Extubation in the operating room		0.017		<0.001
No	5.2 (SD 1.1)		19.5 (SD 17.8)
Yes	6.0 (SD 1.6)		44.6 (SD 30.6)