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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Time and frequency -Domain Interpretation of Phase-lead Control01:24

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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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Types of Reports I: Hands-off Report01:25

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Updated: Feb 1, 2026

Electrocardiogram Recordings in Anesthetized Mice using Lead II
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An Itchy Lead: First Reported Case of Ventricular Pacemaker Lead Self-Extraction.

Brent Klinkhammer1, Mevan Wijetunga2, Yassar Almanaseer2

  • 1University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND 58202.

Journal of Atrial Fibrillation
|December 4, 2018
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Summary

A rare case of pacemaker lead self-extraction occurred in a 98-year-old woman with dementia. This event highlights risks associated with cardiac device implantation in elderly patients with cognitive impairment.

Keywords:
: Ventricular LeadAtrial FibrillationSelf-extraction

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Area of Science:

  • Cardiology
  • Geriatric Medicine
  • Biomedical Engineering

Background:

  • Pacemaker implantation is common in elderly patients with cardiac conditions.
  • Elderly patients, particularly those with cognitive impairment, present unique challenges for device management.
  • Dual chamber pacemakers are frequently used to manage bradyarrhythmias.

Observation:

  • A 98-year-old female with Alzheimer's dementia, atrial fibrillation, and sick sinus syndrome experienced unwitnessed self-extraction of her ventricular pacemaker lead.
  • The patient was admitted in clinically stable condition despite the lead dislodgement.
  • This represents the first reported case of ventricular lead self-extraction in this demographic.

Findings:

  • Self-extraction of pacemaker leads, though rare, can occur even in stable patients.
  • The patient's advanced age and cognitive impairment were significant factors in this case.
  • The integrity of the lead fixation and pocket management are crucial for preventing such events.

Implications:

  • Highlights the potential risks of pacemaker and implantable cardioverter-defibrillator (ICD) placement in the elderly and cognitively impaired.
  • Emphasizes the need for careful patient selection and monitoring in this population.
  • Suggests a need for further research into lead securement techniques and patient management strategies for high-risk individuals.