The accuracy of blood pressure measured by arterial line and non-invasive cuff in critically ill children

Table 2 Independent predictors of the difference between non-invasive cuff and invasive arterial blood pressure by multivariable linear regression

Outcome	Variable	Effect size (95 % CI)	P value
For the n = 66 flush-tested arterial lines
∆SBP	Day category	4.9 (0.2, 9.7)	0.043
∆DBP	Vasodilator in use	15.6 (2.9, 28.3)	0.016
	Day category	5.5 (1.6, 9.5)	0.007
	Optimally damped	−7.2 (−12.2, −2.2)	0.005
∆MAP	Vasodilator in use	10.0 (−0.3, 20.4)	0.057
	Day category	4.5 (1.3, 7.7)	0.007
	Optimally damped	−4.0 (−8.0, 0.1)	0.058
For all 147 arterial lines
∆SBP	Inotrope in use	−5.75 (−11.3, −0.18)	0.043
	Peripheral AL site	5.03 (0.06, 10.0)	0.048
∆DBP	-	-	All ns
∆MAP	-	-	All ns
For the 42 flush-tested arterial lines in the d1–3 category
∆SBP	-	-	All ns
∆DBP	-	-	All ns
∆MAP	Vasodilator in use	17.8 (1.6, 34.1)	0.032
	Optimally damped	−5.4 (−10.3, −0.4)	0.035
For all 83 arterial lines tested in the d1–3 category
∆SBP	Inotrope in use	−8.1 (−16.1, −0.13)	0.047
	Peripheral AL site	6.3 (−0.4, 13.0)	0.065
	Weight	−0.13 (−0.27, 0.01)	0.060
∆DBP	-	-	All ns
∆MAP	-	-	All ns

SBP systolic blood pressure, DBP diastolic blood pressure, MAP mean arterial pressure, AL arterial line(s), ∆ difference (non-invasive cuff blood pressure minus invasive arterial blood pressure), d1–3 day 1–3, ns not significant. There was no meaningful difference in results if inotrope score was entered instead of inotrope in use; for all arterial lines and ∆SBP the effect size for inotrope score was 0.98 (0.28, 1.68; p = 0.007) for 147 AL, and 1.36 (0.11, 2.61; p = 0.033) for all 83 d1–3-category AL

ISSN: 1364-8535