Which factor can cause an inaccurate ICP reading with an intraventricular monitoring system?

Which factor can cause an inaccurate ICP reading with an intraventricular monitoring system?

• A. P2 wave is higher than P1 wave
• B. CSF is leaking around the monitoring device
• C. The transducer of the ventriculostomy monitor is at the level of the upper ear
• D. The drain of the CSF drainage device was closed for 6 minutes before taking the reading

Answer: (B)

A leak around the monitoring device directly compromises the accuracy of the intracranial pressure reading. Intraventricular monitoring relies on a closed, continuous connection from the ventricle through the catheter and tubing to the transducer. When CSF leaks at the catheter site, pressure is not fully transmitted to the transducer, so the measured value no longer reflects the true intracranial pressure. This leakage causes erroneous, often lower or unstable readings and undermines the reliability of the monitor. If the transducer isn’t placed at the correct level, hydrostatic pressure is misrepresented—being too high or too low relative to the foramen of Monro can skew the reading. The waveform pattern (P2 higher than P1) signals decreased brain compliance rather than an accuracy problem with the measurement. Keeping the drainage system closed for several minutes can affect CSF dynamics, but it is the leak around the device that most directly yields an inaccurate ICP measurement.

A leak around the monitoring device directly compromises the accuracy of the intracranial pressure reading. Intraventricular monitoring relies on a closed, continuous connection from the ventricle through the catheter and tubing to the transducer. When CSF leaks at the catheter site, pressure is not fully transmitted to the transducer, so the measured value no longer reflects the true intracranial pressure. This leakage causes erroneous, often lower or unstable readings and undermines the reliability of the monitor.

If the transducer isn’t placed at the correct level, hydrostatic pressure is misrepresented—being too high or too low relative to the foramen of Monro can skew the reading. The waveform pattern (P2 higher than P1) signals decreased brain compliance rather than an accuracy problem with the measurement. Keeping the drainage system closed for several minutes can affect CSF dynamics, but it is the leak around the device that most directly yields an inaccurate ICP measurement.