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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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Cardiac Artifacts

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Dr. Rishabh Pathak

Cardiac artifacts in EEG recordings refer to unwanted signals that originate from the electrical or mechanical activity of the heart. These artifacts can interfere with the accurate interpretation of brain activity captured by the EEG.


1.     Electrical Cardiac Artifacts:

o Description: Electrical cardiac artifacts result from the electrical signals generated by the heart's activity.

o  Characteristics: These artifacts are time-locked to cardiac events and can appear similar to ECG signals. However, due to the distance from the heart and suboptimal visualization axis, they may not always resemble typical ECG waveforms.

o    Types:

§  Pacemaker Artifact: This type of artifact has high-frequency polyphasic potentials with a shorter duration compared to ECG artifacts. It often shows a broader distribution across the EEG channels.

§ ECG Artifact: Represents the actual ECG signal recorded from head electrodes but may not always be easily recognizable as ECG due to recording conditions.

2.   Mechanical Cardiac Artifacts:

o  Description: Mechanical cardiac artifacts arise from the physical movements associated with cardiac contractions.

o  Characteristics: These artifacts may manifest as periodic slow waves following the ECG peak or exhibit saw-tooth patterns or sharply contoured waveforms.

o    Types:

§Pulse Artifact: Typically seen as a slow wave following the ECG peak, commonly observed over frontal and temporal regions. Pressure on the electrode can alter the appearance of this artifact.

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

3.   Identification and Differentiation:

oDistinguishing Features: Pacemaker artifacts have distinct high-frequency polyphasic potentials, while pulse artifacts exhibit slow waves following the ECG peak.

o  Location: Pulse artifacts are often observed over frontal and temporal regions, while ballistocardiographic artifacts may involve multiple electrodes due to head or body movements.

Proper recognition and differentiation of cardiac artifacts from genuine brain activity are crucial for accurate EEG interpretation and diagnosis. Techniques to minimize or eliminate these artifacts during EEG recording can help improve the quality and reliability of EEG data for clinical analysis.

 

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