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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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Updated: Jan 19, 2026

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

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Shunt Failure-The First 30 Days.

Ryan P Lee¹, Sonia Ajmera², Fridtjof Thomas³

¹Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland.

|September 27, 2019

Summary

Predictors of shunt failure within 30 days include small ventricles and prior shunt surgeries. Surgeons can potentially control two of the three identified risk factors for shunt malfunction.

Keywords:

30-d Hydrocephalus failure malfunction predictors shunt surgery

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Shunt Surgery, Right Heart Catheterization, and Vascular Morphometry in a Rat Model for Flow-induced Pulmonary Arterial Hypertension

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Published on: February 11, 2017

Area of Science:

Neurosurgery
Medical Device Research
Patient Safety

Background:

Predicting shunt malfunction is crucial for neurosurgical outcomes.
Identifying early risk factors for shunt failure is essential for timely intervention.

Purpose of the Study:

To identify predictors of ventricular shunt failure within 30 days of index surgery.
To inform clinical practice and improve patient outcomes.

Main Methods:

Retrospective cohort study of 655 patients undergoing 1206 shunt operations.
Analysis of clinical and procedural variables using multivariable logistic regression.
Primary outcome: shunt failure within 30 days of index surgery.

Main Results:

30-day shunt failure rates were 12.4% (first-index) and 15.7% (all-index).
Small or slit ventricles and prior ventricular shunt operations predicted 30-day failure.
Intraventricular hemorrhage also predicted failure in the all-index model.

Conclusions:

Only three variables predict 30-day shunt failure.
Two of these predictors are potentially controllable by the surgeon.
This finding can guide surgical decisions and patient management.