ECG artifacts during intraoperative high-field MRI scanning

Area of Science:

• Anesthesiology
• Neurosurgery
• Medical Imaging

Background:

• High-field (1.5 T) magnetic resonance imaging (MRI) is increasingly used in neurosurgery for intraoperative guidance.
• This technology presents unique challenges for anesthesiologists, especially regarding patient monitoring.
• Ensuring patient safety requires specialized equipment and knowledge of potential interferences.

Purpose of the Study:

• To investigate electrocardiographic (ECG) artifacts during high-field MRI in the operating room.
• To highlight the potential for misinterpretation of ECG signals due to electromagnetic interference.
• To emphasize the importance of understanding these artifacts for anesthesiologists.

Main Methods:

• Monitoring of vital signs, including ECG, in an operating room environment with a high-field MRI scanner.
• Analysis of ECG signals to identify artifacts induced by static and pulsed magnetic fields.
• Comparison of ECG data with interference-free monitoring parameters.

Main Results:

• MRI-compatible ECG monitoring is susceptible to electromagnetic interference, producing artifacts.
• Pulsed high-frequency fields generate characteristic artifacts related to field frequency.
• These artifacts can mimic serious arrhythmias or cause ST-segment abnormalities, leading to potential misdiagnosis.
• Interference-free parameters like pulse oximetry and invasive blood pressure are crucial.

Conclusions:

• Anesthesiologists must be aware of ECG artifacts during high-field MRI to prevent misinterpretation.
• Knowledge of artifact patterns is essential for accurate intraoperative patient assessment.
• Reliance on non-interfering monitoring methods is vital for patient safety during intraoperative MRI procedures.