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Updated: May 18, 2026
Deep Brain Stimulation with Simultaneous fMRI in Rodents
Published on: February 15, 2014
Short circuit in deep brain stimulation.
Kazuhiro Samura1, Yasushi Miyagi, Tsuyoshi Okamoto
1Department of Cancer Therapy and Research, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
This study examined electrical failures in deep brain stimulation systems. The researchers found that short circuits occur more often than previously thought in patients with movement disorders. They discovered that these issues develop gradually rather than suddenly. The study showed that short circuits can cause symptoms like reduced treatment effectiveness. The authors found that using titanium miniplates to anchor DBS leads increases the risk of short circuits. Their findings suggest that regular monitoring is important even after many years of treatment. The study recommends checking electrical resistance at every follow-up visit. This approach could help detect problems before they cause significant symptoms.
Area of Science:
- Neurostimulation device safety
- Movement disorders in neurology
- Medical device complication analysis
Background:
Prior research has shown that deep brain stimulation (DBS) systems can experience electrical failures. It was already known that open circuits in DBS devices lead to sudden loss of function. No prior work had resolved the frequency or progression of short circuits in DBS systems. This gap motivated the current investigation into how often short circuits occur. The uncertainty around their clinical impact drove the need for systematic evaluation. Routine monitoring of DBS systems typically focuses on open circuits. This paper's contribution is identifying a previously under-recognized complication. The authors found that short circuits may manifest gradually rather than suddenly. Their findings challenge assumptions about DBS system durability over time.
Purpose Of The Study:
The authors aimed to determine the incidence of short circuits in DBS systems. They wanted to identify clinical signs associated with these failures. The study sought to evaluate the impact of anchoring methods on circuit integrity. Their goal was to assess whether monitoring could detect short circuits before symptoms worsen. The motivation came from observing gradual symptom changes in some patients. They wanted to compare outcomes between different types of DBS complications. The study focused on patients with movement disorders treated with DBS. Their approach included routine impedance checks during follow-up visits.
Main Methods:
The researchers implemented a policy of measuring both therapeutic and system impedance at every outpatient visit. They analyzed data from 78 patients undergoing DBS follow-up over one year. The study included patients with Parkinson disease and generalized dystonia. They tracked the time between implantation and short circuit detection. The team recorded clinical symptoms associated with short circuits. They examined the anchoring method used for DBS leads. Electrode settings were adjusted in some cases to test for improvement. The study focused on how short circuits differ from open circuits in clinical presentation.
Main Results:
Seven patients (8.9%) showed evidence of short circuits during the study period. The average time to short circuit detection was 64.7 months after implantation. Six patients with Parkinson disease showed symptoms like reduced therapeutic effect. One dystonia patient experienced worsening dystonia after short circuit detection. All short circuits occurred in leads anchored with titanium miniplates. Adjusting electrode settings improved symptoms in 2.5% of affected patients. The dystonia patient required lead repositioning but saw no improvement. Short circuits differ from open circuits by causing gradual symptom changes.
Conclusions:
The authors found that short circuits in DBS systems may be more common than previously recognized. Their findings suggest that anchoring with miniplates increases short circuit risk. The study shows that short circuits cause gradual rather than sudden symptom changes. Routine impedance monitoring can detect these issues before symptoms worsen. The researchers propose that long-term DBS patients should have regular impedance checks. They suggest that anchoring methods may influence device longevity. The study highlights the importance of monitoring even in asymptomatic patients. Their findings imply that standard follow-up protocols should include impedance testing.
Frequently Asked Questions
Short circuits cause gradual symptom changes like reduced therapeutic effect, while open circuits lead to sudden loss of function.
All short circuits occurred in leads anchored with titanium miniplates, according to the authors.
The researchers observed clinical improvement in 2 of 80 patients (2.5%) after electrode adjustments for short circuits.
The team began routinely measuring both therapeutic and system impedance at every outpatient DBS follow-up visit.
The mean duration from implantation to short circuit detection was 64.7 months in this study.
The researchers suggest routine impedance checks should be maintained even after long-term DBS therapy.
