Table 1 The difference between non-invasive cuff and invasive arterial blood pressure measurements
Difference NIBP–IABP | SBP | DBP | MAP |
|---|---|---|---|
For the 66 flush-tested arterial lines* | |||
Optimal damping (n = 30) | 0.8 (12.2); 0.5 (−9, 8.5) | −5.2 (8.7); −5.5 (−10.5, 0.3) | −4.9 (7.6); −6.5 (−10, −2) |
Over damping (n = 25) | −1.5 (11.2); −1 (−7, 6) | 2 (12.5); 1 (−5.5, 6.5) | −1.3 (8.5); −1.3 (−7, 2) |
Under damping (n = 11) | −2.7 (12.5); −3 (−11, 6) | 1.9 (8.4); 1 (−2, 7) | −1.4 (9.6); −4 (−10, 6) |
For all the n = 148 arterial lines | |||
Combined results | −1.7 (11.6); −2 (−8, +5) | −2.1 (11.4); −3 (−8, +3) | −5.0 (9.2); −5 (−10, −1) |
Combined results | r = 0.87 | r = 0.78 | r = 0.87 |
For the 42 flush tested arterial lines in the d1–3 category | |||
Optimal damping (n = 19) | −3.1 (12.2); −4 (−12, 6) | −5.4 (7.4); −6 (−10, 0) | −6.5 (5.6); −8 (−10, −3) |
Over damping (n = 16) | −2.0 (12.7); −0.5 (−7.5, 5.5) | −1.9 (9.7); −1 (−6.8, 3) | −3.5 (7.8); −2.5 (−8, 0.5) |
Under damping (n = 7) | −2.9 (13.8); −4 (−9, 1) | 1.4 (10.4); −3 (−8, 5.5) | −2.0 (10.4); −6 (−14, −1) |
For all the 83 arterial lines in the d1–3 category | |||
Combined results | −1.5 (11.6); −2.0 (−8, 6) | −3.5 (8.4); −4.0 (−8, 1) | −5.5 (7.0); −6.0 (−10, −1) |
Combined results | r = 0.83 | r = 0.84 | r = 0.89 |