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Shunt Admittances

Shunt Admittances

Shunt admittances play a crucial role in the analysis of transmission lines, particularly for three-phase systems with neutral conductors. When a uniformly charged conductor is positioned above the Earth, it induces an equal but opposite charge on its surface. This interaction creates electric field lines between the conductor and the Earth.
To model this effect, the method of images is employed. This method involves replacing the Earth with an image conductor that mirrors the original...

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Related Experiment Video

Updated: Jul 6, 2026

Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus

Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus

Published on: October 14, 2022

Have we made progress in preventing shunt failure? A critical analysis.

Sherman C Stein¹, Wensheng Guo

¹Department of Neurosurgery, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19106, USA. sherman.stein@uphs.upenn.edu

Journal of Neurosurgery. Pediatrics

|March 21, 2008

Summary

Hydrocephalus shunt failure rates have not improved despite decades of experience and technical advancements. Both pediatric and adult shunt failure rates remain a significant concern, with late failures increasing in adults.

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Published on: January 27, 2023

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Last Updated: Jul 6, 2026

Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus

Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus

Published on: October 14, 2022

Hemodynamic Precision in the Neonatal Intensive Care Unit using Targeted Neonatal Echocardiography

Hemodynamic Precision in the Neonatal Intensive Care Unit using Targeted Neonatal Echocardiography

Published on: January 27, 2023

Area of Science:

Neurosurgery
Medical device technology
Biostatistics

Background:

Hydrocephalus shunts are critical devices for managing cerebrospinal fluid (CSF) imbalances.
Shunt failure is a common complication, necessitating revision surgeries and impacting patient outcomes.
Previous assumptions suggested improvements in shunt technology and surgical techniques may have reduced failure rates over time.

Purpose of the Study:

To investigate temporal trends in hydrocephalus shunt failure rates.
To determine if surgical experience or technical advancements have led to a decrease in shunt malfunctions.
To analyze failure rates separately for pediatric and adult populations.

Main Methods:

A systematic literature search was conducted for case series on shunt insertion and failure.
A meta-analytic model was employed to statistically pool data and assess temporal trends.
Separate analyses were performed for pediatric (<17 years) and adult patient cohorts.

Main Results:

In children, the initial 1-year shunt failure rate was 31.3%, with a subsequent annual rate of 4.5%, showing no significant temporal change.
Adult 1-year shunt failure rates demonstrated a slight decrease over time.
Conversely, late shunt failure rates in adults have shown an increase over the study period.

Conclusions:

Despite advancements in shunt materials and insertion techniques, significant progress in reducing overall shunt failures has not been achieved over recent decades.
Biological factors and other unaddressed issues appear to counteract any benefits from technological improvements.
Continued research is needed to identify and mitigate the underlying causes of persistent shunt failure.