| paediGAV - recommended pressure levels
The paediGAV is available in six different pressure configurations. It is MRI-safe and calibrated in accordance with strict quality control standards.
recommended pressure levels paediGAV (pdf) |
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| Standard |
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opening pressure (horizontal position)
(cmH2O) |
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opening pressure (vertical position)
(cmH2O) |
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| children up to 6 months of age |
4 |
24 |
| children from 6 months of age up to 5 years of age |
9 |
24 |
| children over 5 years of age |
9 |
29 |
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| Reading the pressure setting from an X-ray image
Every single pressure configuration is individually coded and can be identified on the paediGAV in an X-ray image post-operatively.
Fig.1 shows the X-ray image of a paediGAV
(9 / 24 cmH2O).
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Fig. 1  |
| The paediGAV is available in the following pressure settings: |
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opening pressure
horizontal position / vertical position
(cmH2O) |
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coding paediGAV in X-ray image |
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coding old paediGAV
(with distal catheter)
in radiograph
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4 / 14 |
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4 / 19 |
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4 / 24 |
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9 /19 |
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9 / 24 |
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9 / 29 |
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| Opening pressure (OP) of paediGAV |
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The opening pressure of the paediGAV depends on the individual patient's posture. The ball-cone unit determines the pressure level in the horizontal body position. The opening pressure in the vertical body position is the sum of the opening pressures of both the ball-cone and gravitational units. The valve adjusts for body positions at all possible angles of elevation and the opening pressure can be calculated as follows: |
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| OPtotal = OPball-in-cone unit + sine(angle) x OPgravitational unit |
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Example - calculating the opening pressure in different body positions:
paediGAV 4 / 24 cmH2O
Horizontal position: only the ball-cone unit influences the opening pressure.
OPtotal = 4 + 0 = 4 cmH2O.
Vertical position: effect of graviational unit is highest at this point.
OPtotal = 4 + 20 = 24 cmH2O
Inclined at 45°: the effect of the graviational unit depends on the body position.
OPtotal = 4 + sin 45° x 20 = 18 cmH2O |
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Fig. 2: opening pressure dependent on patient's posture
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