Skip to main content

Table 1 Dynamic parameters. Changes in respiratory variation in power, flow and pressure parameters, both during spontaneous breathing and NPPV

From: Cardiac power parameters during hypovolemia, induced by the lower body negative pressure technique, in healthy volunteers

Power parameters, dynamic
  Delta PWRmax (*10-2) Delta PWR-integral (*10-2)
  Spontaneous breathing NPPV Spontaneous breathing NPPV
  Mean (sd) Change Mean (sd) Change Mean (sd) Change Mean (sd) Change
Baseline 11.3 (7.0)   16.4 (7.6)   18.3 (8.9)   20.8  
20 mmHg *14.3 (11.6) +27 % 16.2 (6.9)   19.7 (17.6)   20.3  
40 mmHg **16.3 (9.4) +44 % 16.4 (7.7)   21.6 (13.7)   *26 (15.4) +25 %
60 mmHg *15.7 (8.9) +39 % **20.6 (9.0) +26 % 22.8 (12.3)   *25.9 (14) +25 %
80 mmHg **21.6 (11.8) +91 % **27.1 (9.7) +65 % **30.7 (23.2) +68 % **39.9 (22.2) +92 %
Flow parameters, dynamic
  Delta peak aortic flow (*10-2) Delta stroke volume (*10-2)
  Spontaneous breathing NPPV Spontaneous breathing NPPV
  Mean (sd) Change Mean (sd) Change Mean (sd) Change Mean (sd) Change
Baseline 8.9 (6.0)   14 (7.2)   15.8 (7.8)   20.1 (11.7)  
20 mmHg **12.3 (9.0) +38 % 14.5 (7.3)   17.4 (17.1)   19.2 (11.4)  
40 mmHg **14.6 (9.2) +64 % 14.6 (7.3)   20.4 (14.9)   *25.3 (16.6) +26 %
60 mmHg **13 (7.6) +46 % 15.4 (8.3)   *22.5 (14.6) +42 % *25.9 (14.0) +29 %
80 mmHg **18.1 (10.7) +103 % **20.3 (7.9) +45 % **30.4 (23.3) +92 % **40.6 (23.7) +102 %
Pressure parameters, dynamic
  Delta systolic pressure (*10-2) Delta pulse pressure (*10-2)
  Spontaneous breathing NPPV Spontaneous breathing NPPV
  Mean (sd) Change Mean (sd) Change Mean (sd) Change Mean (sd) Change
Baseline 3.8 (2.6)   4.3 (2.6)   7.5 (4.5)   6.8 (6.0)  
20 mmHg 4.5 (2.6)   4.7 (2.5)   8.2 (5.6)   8 (4.9)  
40 mmHg 4.7 (3.8)   *5.5 (2.6) +28 % 8.2 (6.9)   *8.9 (5.0) +31 %
60 mmHg *5.3 (3.5) +39 % *7.3 (3.8) +70 % 8.7 (6.7)   **13.1 (8.0) +93 %
80 mmHg **6.7 (3.8) +76 % **10 (4.3) +133 % **10.8 (5.8) +44 % **14.9 (6.5) +119 %
  1. *Significant to a level of p < 0.05
  2. **Significant to a level of p < 0.001