Table 2 Intracranial pressure and the change of intracranial pressure at each positive end-expiratory pressure level
Condition | PEEP | ICP | ∆ICP | Cumulative ∆ICP |
|---|---|---|---|---|
(cm H2O) | (mm Hg) | (mm Hg) | (mm Hg) | |
Normal | 5 | 6 (3, 10.8) | – | – |
10 | 6.5 (4, 11.8) | 1 (1, 1) | 1 (1, 1) | |
15 | 8 (5, 12.8) | 1 (1, 1) | 2 (2, 2) | |
20 | 9 (6, 13.5) | 1 (1, 1) | 3 (2.3, 3) | |
25 | 10 (7, 14.3) | 1 (0.3, 1) | 4 (3, 4) | |
CW | 5 | 7.5 (5, 14.5) | – | – |
10 | 8.5 (6.3, 16.5) | 1.5 (1, 2) | 1.5 (1, 2) | |
15 | 10 (8.3, 18.3) | 2 (1, 2) | 3 (3, 4) | |
20 | 11 (9.3, 20.3) | 1 (1, 1.8) | 4.5 (4, 5) | |
25 | 13 (11.3, 21.3) | 1.5 (1, 2) | 6 (5.3, 6.8) | |
L | 5 | 6.5 (5, 11.8) | – | – |
10 | 7 (5.3, 11.8) | 0 (0, 0.8) | 0 (0, 0.8) | |
15 | 8.5 (6.3, 12.5) | 1 (1, 1) | 1 (1, 1.8) | |
20 | 9 (6.8, 12.5) | 0.5 (0, 1.8) | 2 (1, 3) | |
25 | 9.5 (7.3, 12.5) | 0 (0, 1) | 2 (1.3, 3.8) | |
L + CW | 5 | 10.5 (6, 13) | – | – |
10 | 11.5 (7, 19.8) | 1 (0.3, 1) | 1 (0.3, 1) | |
15 | 12 (8, 14) | 1 (0, 1) | 1 (1, 2) | |
20 | 13.5 (9.3, 14.8) | 1 (0.3, 2) | 2.5 (1.3, 3.8) | |
25 | 14.5 (10.3, 16.5) | 1 (1, 1) | 4 (2.3, 4.8) | |
L + CW + IH | 5 | 37 (31.8, 39.5) | – | – |
10 | 35 (29.3, 36.8) | -2 (−3.8, −1.3) | -2 (−3.8, −1.3) | |
15 | 32.5 (28.8, 35.5) | -2 (−2, −1) | −4 (−5.8, − 3) | |
20 | 30 (28.5, 33.3) | −1.5 (−3.5, 0) | −6 (−9.5, − 3.3) | |
25 | 26 (26, 30.8) | −3.5 (−4, − 1.3) | −10 (− 13.5, − 5.5) | |
L + IH | 5 | 34 (30.3, 35) | – | – |
10 | 31 (29.3, 34.5) | −1 (− 3.5, −0.3) | −1 (− 3.5, −0.3) | |
15 | 30 (26.3, 33.8) | − 2 (− 2.8, − 0.3) | − 3 (− 5.8, − 1) | |
20 | 26 (22.3, 32.8) | −2.5 (− 5.5, − 1) | −7.5 (− 11.3, − 1.8) | |
25 | 24 (20.5, 30) | −2 (− 3.5, − 1.3) | −9.5 (− 12.5, − 5.3) |