Experience with Telemetric Pressure Measurements in Shunt Systems

Chapman, Paul H.; Cosman, E.R.; Zervas, Nicholas T.

doi:10.1159/000120831

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…The ICP measurements were obtained as described 10,18 by using the TeleSensor device. [4][5][6][7] Angles of elevation of the head were estimated from a tilt table or from the anglemeasuring device found in the frames of hospital beds. Measurements were performed two to three times over 20 to 30 seconds at each postural elevation (0˚, 15˚, 30˚, 45˚, 60˚, 75˚, and 90˚).…”

Section: Measurements Of Icpmentioning

confidence: 99%

In vivo intracranial pressure dynamics in patients with hydrocephalus treated by shunt placement

Frim¹,

Goumnerova²

2000

Journal of Neurosurgery

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The authors found that differential-pressure valves always caused ICP to drop to 0 by 30 degrees of head elevation, whereas all other valve systems caused a more gradual drop in ICP, more consistent with pressures observed in the control patients without shunts. Not surprisingly, the differential-pressure valve group was found to have a significant difference in mean regression coefficient when compared with those in whom nonsiphoning shunts (p < 0.023) or no shunts were placed (p < 0.049). These data provide a basis for evaluating shunt valve performance and for predicting valve appropriateness in patients in whom characteristics such as pressure and flow dynamics are weighed in the choice of a specific valve for implantation.

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Section: Measurements Of Icpmentioning

confidence: 99%

In vivo intracranial pressure dynamics in patients with hydrocephalus treated by shunt placement

Frim¹,

Goumnerova²

2000

Journal of Neurosurgery

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New analysis techniques and waveform displaying for intracranial pressure data

Flick¹,

Orglmeister²,

Köhler³

et al.

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedi

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Evaluation of Shunt Malfunction Using Shunt Site Reservoir

Sood

Canady

Ham³

2000

Pediatr Neurosurg

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Objective: To determine the usefulness of a separate reservoir placed at the site of the shunt in evaluation of shunt malfunction. Methods and Materials: A ventricular catheter was placed alongside the proximal catheter of the shunt and connected to a subgaleal reservoir in 17 patients, in 9 a double-lumen catheter with integrated reservoir and in 13 patients a dual catheter with a double-port reservoir was used. At presentation of suspected shunt malfunction, a standard shunt function evaluation using shunt tap, CT scan or shunt injection was performed, and subsequently, the pressure from the tap of the reservoir was obtained. Results: Thirty-three patients presented with symptoms of malfunction at an interval of 2.3 ± 3 months (range 2–429 days). The pretest probability of shunt malfunction in this population was 73%. Posttest probability of shunt malfunction was 82.5% with standard evaluation and improved to 100% by the separate reservoir tap pressure measurement. In 4 patients in whom the shunt tap was dry, shunt infection was diagnosed prior to revision using CSF obtained at the reservoir tap. In 5 patients with proximal malfunction and bradycardia, the reservoir tap allowed early ventricular decompression. Conclusion: This study shows that a reservoir placed at the site of the shunt remains patient even when the shunt malfunctions, suggesting that flow rather than catheter position is important in proximal malfunction. It is superior to shunt tap for detection of shunt malfunction and infection, and it allows early ventricular decompression in a sick patient awaiting surgery for shunt revision.

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Experience with Telemetric Pressure Measurements in Shunt Systems

Cited by 3 publications

References 7 publications

In vivo intracranial pressure dynamics in patients with hydrocephalus treated by shunt placement

In vivo intracranial pressure dynamics in patients with hydrocephalus treated by shunt placement

New analysis techniques and waveform displaying for intracranial pressure data

Evaluation of Shunt Malfunction Using Shunt Site Reservoir

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