Comparing oscillometric noninvasive and invasive intra‐arterial blood pressure monitoring in term neonates under general anesthesia: A retrospective study

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Tables

Table 1

Patient characteristics and neonatal blood pressure data

Characteristic

Value

Age; days

2 (1-13 [0-27])

Sex; female

22 (33%)

Height; cm

49.0 (2.3)

Weight; kg

2.96 (0.4)

Surgical procedures

Abdominal surgery

48 (72%)

Thoracic surgery

19 (28%)

Operation time; min

129 (97.5-180 [20-424])

Non-invasive SBP; mmHg

62.6 (11.4)

Non-invasive DBP; mmHg

33.6 (9.5)

Non-invasive mean BP; mmHg

44.2 (9.1)

Invasive intra-arterial SBP; mmHg

53.4 (11.4)

Invasive intra-arterial DBP; mmHg

35.2 (8.7)

Invasive intra-arterial mean BP; mmHg

42.8 (9.8)

Values are presented as the mean (standard deviation), median (interquartile range

[range]), or number (proportion, %) of patients. BP, blood pressure; DBP diastolic blood

pressure; SBP, systolic blood pressure.

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Table 2

Agreement of blood pressure values between oscillometric non-invasive and invasive

intra-arterial blood pressures

All data (n=1193)

Bias

SD

Percentage error

Correlation coefficient

Systolic

-9.3

8.4

26.9%

0.73

Diastolic

1.6

6.5

38.7%

0.75

Mean

-1.3

5.8

26.4%

0.81

Lower intra-arterial BP (intra-arterial mean BP ≤30 mmHg) (n=94)

Systolic

-11.1

5.6

24.2%

0.36

Diastolic

-0.7

3.7

31.6%

0.53

Mean

-5.1

4.2

25.4%

0.43

Higher intra-arterial BP (intra-arterial mean BP ≥60 mmHg) (n=62)

Systolic

0.1

9.7

23.3%

0.69

Diastolic

5.6

9.4

36.3%

0.71

Mean

6.4

7.4

23.5%

0.80

BP, blood pressure; SD, standard deviation.

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Figure 1

Bland-Altman analysis assessing the reliability of both the oscillometric non-invasive and

invasive intra-arterial blood pressure measurement methods.

Bland-Altman analysis shows the mean bias (bold line) and 95% limits of agreement

(dashed line). (A) Systolic, (B) diastolic, and (C) mean blood pressure. BP, blood pressure;

SD, standard deviation.

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Figure 2

Four-quadrant plot analysis for the tracking ability of two blood pressure monitoring

methods.

Black points show the change of each paired blood pressure within two minutes (Δ intraarterial BP: tracks the change of intra-arterial blood pressure; Δ non-invasive BP: tracks

the change of non-invasive blood pressure). The exclusion zone is ≤5 mmHg. (A) Systolic,

(B) diastolic, and (C) mean blood pressure. BP, blood pressure.

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