![]() EEG monitoring in the intensive care unit: pitfalls and caveats. Significant prosopoglossopharyngeal movements affecting the EEG. Detection of muscle artifact in the normal human awake EEG. EEG in the diagnosis, classification, and management of patients with epilepsy. EEG in neurological conditions other than epilepsy: when does it help, what does it add?. Simultaneous EMGs and EEGs in paralysis agitans. The correction of ocular artifacts: a topographic perspective. Picton TW, van Roon P, Armilio ML, et al. Current Practice of Clinical Electroencephalography. Convulsive effects of light stimulation in children. Hoboken, NJ: Wiley & Sons 2006.īickford RG, Daly D, Keith HM. Philadelphia: WB Saunders Co 2000.īenbadis SR. Atlas and Classification of Electroencephalography. EEG artifact removal-state-of-the-art and guidelines. Automatic Artifact Removal from Electroencephalogram Data Based on A Priori Artifact Information. Zhang C, Tong L, Zeng Y, Jiang J, Bu H, Yan B, et al. Towards Semi-Automatic Artifact Rejection for the Improvement of Alzheimer's Disease Screening from EEG Signals. For more information, visit the Author Center.Solé-Casals J, Vialatte FB. The authors attest they are in compliance with human studies committees and animal welfare regulations of the authors’ institutions and Food and Drug Administration guidelines, including patient consent where appropriate. "Transient silent ischemia after percutaneous transluminal coronary angioplasty manifested with a bizarre electrocardiogram". "Images in cardiovascular medicine: pseudo-myocardial infarction". Hung S.C., Chiang C.E., Chen J.D., Ding P.Y. "Asymptomatic ST-segment-elevation ECG in patient with kidney failure". "Electromechanical association: a subtle electrocardiogram artifact". Bizarre appearing T waves in the distribution of a single lead should suggest arterial pulse tapping artifact.ġ. When encountering unexpected ECG findings, careful inspection of both the ECG and lead positioning on the patient may help to identify the underlying cause. It is conceivable that this may have led to needless testing and treatment.Ī repeat ECG was performed after moving the left limb lead away from the fistula ( Figure 1C), which demonstrated sinus arrhythmia with resolution of STE, with wander artifact only.ĮCG artifacts are common and may often interfere with interpretation. This serves as a reminder of the dangers of early diagnostic closure and the need for expert ECG analysis. Several publications of arterial pulse tapping artifacts might have been misinterpreted as an alternate etiology (eg, coronary artery spasm or pancreatitis) ( 3, 4). This difference accounts for the comparatively smaller changes in amplitude in the precordial leads. Therefore, the left limb lead will still influence the precordial lead voltage calculation, although to a lesser extent than leads I and III. The Wilson central terminal uses the 3 limb leads to create an average potential across the body, thereby acting as the negative pole of the unipolar leads. This is because the negative pole of the unipolar leads is calculated by the average generated by the 3 limb leads, referred to as the Wilson central terminal ( 1). The precordial leads are also affected by this phenomenon, although they do not directly interface with the fistula. This can be visually conceptualized by review of Einthoven’s triangle ( Figure 1B). The other lead voltages are calculated as per Figure 1A. Lead II was the only lead unaffected because it was the only lead that did not manifest any effect of the left limb electrode in its voltage calculation: II = F − R. Careful inspection of the electrocardiogram (ECG) revealed that the ST-segment elevation (STE) is related to each QRS, with each artifact at exactly the same time of the QRST complex therefore, it is generated by the cardiac cycle rather than by something external (eg, patient movement) ( 1, 2). ![]() This finding, referred to as arterial pulse tapping artifact, is generated by the movement of the electrode with each pulsatile motion of blood flow through the fistula. The abnormal appearance of the T waves in all leads except for lead II was caused by the left arm (LA) electrode being placed near an artery-in this case, the patient’s left upper extremity dialysis fistula.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |