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Overnight shunt pressure monitoring in children
1Sheffield Childrens Hospital, Western Bank, UK.
Insights
Overnight shunt pressure monitoring aids in diagnosing shunt dysfunction in children. Abnormal pressure readings, whether asleep or awake, are significant indicators of potential shunt issues.
Area of Science:
- Pediatric Neurosurgery
- Medical Device Technology
- Hydrocephalus Management
Background:
- Shunt dysfunction is a common complication in pediatric hydrocephalus management.
- Accurate diagnosis of shunt malfunction is crucial for timely intervention and improved patient outcomes.
- Non-invasive monitoring methods are needed to assess shunt performance in symptomatic children.
Purpose of the Study:
- To evaluate the diagnostic utility of overnight shunt pressure monitoring in children with suspected shunt dysfunction.
- To determine the significance of pressure abnormalities recorded during different states (sleep/wake, posture).
Main Methods:
- Overnight shunt pressure monitoring was performed in 17 children using a 25G butterfly needle and a disposable arterial pressure monitor.
- Pressure data was continuously recorded, noting posture, sleep state, and symptoms.
- Traces were analyzed for asleep/supine/prone and awake/upright states.
Main Results:
- Six children showed pressure peaks during sleep; four underwent successful shunt revision.
- Two children with blocked shunts had normal sleep traces but abnormal awake/upright pressure peaks.
- Two children with pressure troughs responded to intervention or resolved spontaneously.
- Five children with normal traces during sleep and wakefulness experienced symptom resolution in most cases.
Conclusions:
- Prolonged overnight shunt pressure monitoring is a valuable tool for diagnosing shunt dysfunction in pediatric patients.
- Abnormal pressure findings during wakefulness and upright posture are as diagnostically significant as those during sleep and supine/prone positions.
- This monitoring technique can guide clinical decision-making for shunt revision or conservative management.
Abstract:
We audited the value of overnight shunt pressure monitoring in 17 children with symptoms of possible shunt dysfunction but no other supportive evidence. The shunt was accessed by a 25G butterfly connected to a disposable arterial pressure monitor positioned on the ipsilateral shoulder whose output was recorded continuously, while noting posture, sleep state and symptoms. Initially traces were analysed only for the portion spent both asleep and supine or prone. Six showed pressure peaks while asleep: of these four underwent shunt revision with remission of their symptoms and two resolved spontaneously, one with a simultaneous resolution of a peritoneal CSF collection, but the other had a recurrence of symptoms after six months. Two more subsequently shown to have blocked shunts had normal traces while asleep but abnormal pressure peaks when awake and upright. Two showed pressure troughs: one responded to insertion of an antisyphon device and one resolved spontaneously. Five had normal traces while asleep and awake: symptoms resolved in three and persisted in two in whom later prolonged extradural monitoring with a fibre-optic transducer was also normal. Studies failed in two. We conclude that prolonged overnight shunt pressure monitoring with this technique is useful in diagnosing shunt dysfunction and that abnormalities detected while awake and upright are as significant as those detected asleep and supine or prone.