Effect of Head Rotation on Cerebral Blood Velocity in the Prone Position
Table 1
Systemic and cerebral circulatory and jugular venous responses to continuous positive airway pressure (CPAP) at different body positions.
Position
Supine
Prone
Prone w/head turned
CPAP
0 cmH2O
10 cmH2O
0 cmH2O
10 cmH2O
0 cmH2O
10 cmH2O
ΔMCA mean (%)
0 ± 0
−6.8 ± 2.5†
−2.0 ± 2.4
−4.4 ± 2.8
−3.9 ± 2.6
−8.6 ± 3.2†
ΔSV (%)
0 ± 0
−3.0 ± 0.8†
−5.4 ± 1.5*
−9.3 ± 1.3†
−5.7 ± 1.6*
−9.0 ± 1.4†
ΔCO (%)
0 ± 0
−3.4 ± 1.4†
−2.3 ± 1.9*
−7.2 ± 2.4†
−2.6 ± 1.6*
−6.4 ± 1.7†
HR (bpm)
59 ± 2
59 ± 2
61 ± 2
61 ± 2
62 ± 2
61 ± 2
MAP (mmHg)
78 ± 2
79 ± 2†
80 ± 3*
84 ± 3†
84 ± 3*
87 ± 2†
jugR(cm2)
1.0 ± 0.5
1.4 ± 0.5†
1.9* ± 0.8
2.1 ± 0.9†
0.9* ± 1.1
1.2 ± 1.0†
jugL (cm2)
0.7 ± 0.4
0.9 ± 0.5†
1.3* ± 0.7
1.2 ± 0.6†
1.1* ± 0.6
1.2 ± 0.6†
Changes in middle cerebral artery mean blood velocity (ΔMCA mean), mean arterial pressure (MAP), cardiac stroke volume (ΔSV), cardiac output (ΔCO), heart rate (HR), and right and left internal jugular vein cross-sectional area (jugR, jugL) during CPAP 0 cmH2O and 10 cmH2O. *Significant different from supine, . †Significant different from 0 cmH2O CPAP.
