Related Experiment Video
Updated: Aug 17, 2026
Recording Human Electrocorticographic (ECoG) Signals for Neuroscientific Research and Real-time Functional Cortical Mapping
Published on: June 26, 2012
The usefulness of routine electrocardiographic monitoring in the EEG laboratory
Insights
Routine electrocardiogram (EKG) monitoring in EEG labs reveals significant cardiac abnormalities in general hospital patients. Hyperventilation may adversely affect patients, necessitating cardiac status assessment before the procedure.
Area of Science:
- Clinical Cardiology
- Neurophysiology
- Diagnostic Procedures
Background:
- Electrocardiogram (EKG) abnormalities are frequently observed in general hospital populations.
- Cardiac disease is often unsuspected in patients presenting with neurological symptoms.
Purpose of the Study:
- To assess the prevalence of EKG abnormalities in general hospital patients undergoing EEG.
- To evaluate the impact of hyperventilation on patients with and without EKG abnormalities.
- To advocate for routine EKG monitoring in EEG laboratories.
Main Methods:
- EKG monitoring was performed on two groups of 500 unselected general hospital patients during EEG.
- Hyperventilation provocation was administered, and its effects on heart rate and EKG were analyzed.
- Cardiac status was assessed in patients with detected abnormalities.
Main Results:
- EKG abnormalities were detected in 7% and 18.6% of patients.
- Premature ventricular contractions were the most common abnormality, with diverse serious and minor findings.
- Cardiac disease was confirmed in a majority of unsuspected cases.
- Hyperventilation adversely affected 9-50% of patients, with variable heart rate changes.
Conclusions:
- Routine EKG monitoring should be integrated into standard EEG laboratory procedures.
- Hyperventilation is not a benign procedure and requires careful patient cardiac assessment and EKG monitoring.
- Early detection of cardiac disease is possible through integrated EEG and EKG monitoring.
Abstract:
In two groups of 500 unselected general hospital patients, EKG abnormalities were found in the EEG lab in 7% and 18.6%. While the most common abnormality was premature ventricular contractions, a wide variety of serious and minor abnormalities were seen, in some instances of emergent nature. Cardiac disease was unsuspected in around 40% of these patients and confirmed in a majority of these when looked for. Depending on the EKG abnormality, hyperventilation was shown to have an adverse effect 9--50% of the time in patients with normal EKG's, it tended to produce an increase of heart rate, but this was not invariant and the change in heart rate was not related to air exchange or EEG change. It is easy for any EEG laboratory to record EKG with existing equipment, and the results of this study suggest that it should be incorporated as a routine procedure. Moreover, the data indicated that hyperventilation is not necessarily a benign procedure. It should be undertaken only after control EKG recordings and assessment of the patient's cardiac status, and performed with EKG monitoring.
Related Concept Videos
01:30Pulse rhythm
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
01:29Electrocardiogram
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
01:28Electrocardiogram Fundamentals
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...
01:23Holter Monitor: 24-Hour Monitoring