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Robotics in Neurorehabilitation: Beyond the Hype—Understanding What It Can (and Cannot) Do

Dr. Rishabh Pathak
Over the past decade, robotic neurorehabilitation has become one of the most discussed innovations in neurological recovery. Robotic gait trainers, upper-limb rehabilitation systems, exoskeletons, and AI-assisted rehabilitation devices are increasingly being adopted by hospitals and rehabilitation centres worldwide. However, an important question remains: Are robots the future of neurorehabilitation—or are they simply another tool in the rehabilitation toolbox? As clinicians and researchers, we must move beyond marketing claims and focus on scientific evidence, patient selection, and clinical reasoning. What is Robotic Neurorehabilitation? Robotic neurorehabilitation involves the use of electromechanical devices that assist, guide, resist, or augment movement during therapy. These technologies include: • Robotic gait trainers • Wearable exoskeletons • Upper limb robotic rehabilitation devices • End-effector robotic systems • Sensor-based rehabilitation platforms • AI-assiste...
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Types of cardiac Artifacts

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Dr. Rishabh Pathak

Cardiac artifacts in EEG recordings can be categorized into different types based on their sources and characteristics. 

1.     Electrical Cardiac Artifacts:

o Description: Result from electrical effects of cardiac activity.

o    Characteristics:

§Time-Locked: Occur in relation to cardiac contractions, synchronized with ECG complexes.

§Appearance: May resemble ECG signals but with differences due to distance from the heart and suboptimal axis for visualization.

o    Types:

§Pacemaker Artifact: Characterized by high-frequency polyphasic potentials with a shorter duration than ECG artifacts, often showing a broader field of distribution.

§ECG Artifact: Represents the actual ECG signal recorded from head electrodes, but may not always resemble a typical ECG due to recording distance and axis issues.

2.   Mechanical Cardiac Artifacts:

oDescription: Arise from mechanical effects of cardiac activity.

o    Characteristics:

§  Source: Associated with circulatory pulse and movements of the head or body during cardiac contractions.

§  Waveform: May exhibit periodic slow waves, saw-tooth patterns, or sharply contoured waveforms.

o    Types:

§  Pulse Artifact: Manifests as a slow wave following the ECG peak, commonly observed over frontal and temporal regions, and may be altered by pressure on the electrode.

§  Ballistocardiographic Artifact: Results from slight head or body movements during cardiac contractions, with a waveform similar to pulse artifact but more widespread.

Understanding the characteristics and distinctions between electrical and mechanical cardiac artifacts in EEG recordings is essential for accurate interpretation and differentiation from genuine brain activity. Proper identification of these artifacts can help improve the quality and reliability of EEG data for clinical analysis and diagnosis.

 

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