Module 06
Slides 26–30 | Shaping the field, troubleshooting failure, and managing the DBS system across years
Original lecture slides 26–30 · Module 06 / 10
“Once the lead is implanted, DBS becomes a process of field shaping, clinical troubleshooting, system surveillance and longitudinal adaptation.”
The DBS longitudinal loop
DBS does not end with programming. The field must be optimized, the system must be surveilled, and the therapy must evolve with the patient.
Learning objectives
Original lecture slides
The slides below are reproduced exactly as delivered. Everything outside the slide panel is added study material.
Slide 26
Slide 27
Slide 28
Slide 29
Slide 30
Keyboard: ← previous slide · → next slide · O original slide · S study mode
Expanded study material
Expand each topic without leaving Page 06. All of this material is supplementary to the immutable original slides.
Interactive principle
Explore spatial control conceptually — this is not a device programming interface.
Schematic — not patient-specific
A ring contact distributes current relatively symmetrically. The field overlaps the neighbouring structure, so the side-effect threshold may be reached before adequate benefit.
Directional stimulation redistributes current around the lead. It cannot reach territory the lead never approaches, and it does not compensate for a fundamentally misplaced electrode.
Critical nuance
Directional stimulation is most useful when lead location is already reasonably good, a side-effect structure lies close to the therapeutic territory, current can be steered away from it, the therapeutic window is narrow and programming flexibility is needed. A directional lead cannot reliably compensate for a fundamentally misplaced electrode.
Good lead + directional programming = field optimization
Poor lead + directional programming ≠ perfect targeting
Interactive principle
Schematic thresholds — educational, not patient data.
Stimulation → · schematic, educational
A wide interval between thresholds gives room to titrate as the phenotype changes.
Interactive principle
Each lever reshapes the field. None of them follows a universal rule.
Interactive principle
Work down the chain. Revision is a treatment; localization is the diagnosis.
A lead in perfect position cannot treat a phenotype that does not respond to stimulation. Re-examine the diagnosis in any patient who never responded.
Signature teaching diagram
Localize first. Act second.
“LOCALIZE FIRST. ACT SECOND.”
Case-based learning
Reveal each faculty discussion only after committing to an answer.
Case 01
STN DBS for Parkinson disease. Rigidity improves, bradykinesia improves partially, dysarthria appears at relatively low amplitude, and the lead is reasonably close to the intended target.
Could directional steering help, which structure is likely being recruited, and when would revision be more rational than programming?
Case 02
Increased bradykinesia and gait difficulty, rising medication requirements, tremor still controlled, and a normal device interrogation.
Is this hardware failure, lead migration, disease progression, programming failure or a wrong diagnosis?
Case 03
A patient with long-stable stimulation deteriorates abruptly over days.
What is checked before any stimulation parameter is changed?
Case 04
Tremor well controlled, worse gait and speech, higher medication requirements, battery approaching elective replacement, cognition acceptable.
Is this DBS failure, and what should the clinic prioritize?
Deep study material
Segmented leads can widen the therapeutic window in selected patients, but motor superiority over conventional stimulation has not been consistently demonstrated and long-term comparative data remain limited.
Programming towards maximum useful benefit with a comfortably distant adverse-effect threshold is a core, long-established principle of DBS management.
Structured evaluation of diagnosis, phenotype, lead location, hardware, programming, medication and disease progression before revision is standard practice; the relative weighting of each domain is workflow-dependent.
Device interrogation, impedance assessment, wound review and planned IPG replacement are established components of DBS care.
Multidimensional longitudinal follow-up with programming and medication adaptation is established; evidence beyond roughly a decade is comparatively limited.
Image-guided and automated programming aids are developing rapidly; the strength of the claim determines whether the label is EMERGING or EXPERIMENTAL.
Anatomy
Expanded study material for this section is written once the original slides for this module are supplied.
Surgical principles
Expanded study material for this section is written once the original slides for this module are supplied.
Physiology
Expanded study material for this section is written once the original slides for this module are supplied.
Imaging
Expanded study material for this section is written once the original slides for this module are supplied.
Programming
Expanded study material for this section is written once the original slides for this module are supplied.
Image placeholders
Each placeholder states the image type, what is required, why it teaches and where a legitimate source should come from. No clinical image is fabricated.
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MODULE 06 DIRECTIONAL LEAD ATLAS FIGURE — INSERT AUTHENTIC IMAGE
Real clinical image required
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MODULE 06 LONGITUDINAL OUTCOME FIGURE — INSERT AUTHENTIC IMAGE
Real clinical image required
01
Field shaping
02
Therapeutic window
03
Failure localization
04
System surveillance
05
Longitudinal adaptation
DBS IS A DYNAMIC THERAPY.
Clinical pearls
Common errors
Take-home message
References
“THE GOAL IS NOT TO FIND THE PERFECT SETTING. THE GOAL IS TO MAINTAIN THE BEST THERAPEUTIC STATE AS THE PATIENT, DISEASE AND DEVICE EVOLVE.”
