EKG · EKG Acquisition · 8 min read
Recognizing and Correcting Artifact
- Differentiate the EKG technician's role in artifact correction and emergency reporting from the licensed provider's role in cardiac interpretation and diagnosis.
- Identify the visual characteristics, mechanical causes, and physiological sources of somatic tremor, wandering baseline, alternating-current interference, and interrupted traces.
- Execute appropriate skin preparation, equipment management, and patient care interventions to resolve baseline distortions while maintaining standard frequency response.
The EKG Technician Scope, Diagnostic Quality, and Artifact Basics
In clinical practice, EKG technicians are directly responsible for patient preparation, proper lead placement, and acquiring diagnostic-quality tracings. Achieving an accurate recording requires constant vigilance because the equipment detects subtle electrical signals from the heart. An artifact is defined as any noncardiac signal or recording distortion that appears on an EKG tracing. When extraneous noise interferes with the baseline, the quality of the tracing degrades, which can obscure critical diagnostic waveforms or artificially mimic cardiac pathology.
While technicians are expected to recognize and correct artifact whenever possible, troubleshooting must never compromise patient safety. EKG technicians must recognize and immediately report life-threatening rhythms to a licensed healthcare provider without delay. Technicians should never postpone reporting a suspected life-threatening rhythm simply to spend time troubleshooting or attempting to eliminate artifact. Clear professional boundaries must always be maintained: diagnosing cardiac conditions and interpreting the clinical significance of an EKG are strictly the licensed healthcare provider's responsibility.
To preserve recording fidelity, modern EKG machines feature internal artifact filters. Engaging the EKG machine's artifact filter can successfully reduce baseline noise, but diagnostic tracings should preserve the standard frequency response whenever possible. Relying excessively on filters can alter waveform appearance, so physical correction of the underlying issue remains the gold standard. If artifact persists after performing basic interventions, the technician must carefully re-check both the patient and the equipment. When persistent artifact cannot be resolved, technicians must document the artifact and all corrective steps attempted in accordance with facility policy, and promptly notify the appropriate clinician that a diagnostic-quality tracing cannot be obtained.
Common mistakes
- Assuming a flat line across all leads is merely a loose wire without immediately assessing the patient's responsiveness and pulse.
- Unplugging essential patient care equipment, such as active infusion pumps, in an attempt to eliminate 60-cycle AC interference.
- Moving limb electrodes to proximal locations on the upper arms or thighs without documenting the placement change on the tracing.
- Delaying the immediate reporting of an apparent life-threatening rhythm to a licensed provider in order to troubleshoot or correct baseline noise.
Key points
- EKG technicians prepare patients, place leads, acquire diagnostic tracings, resolve artifact, and immediately report critical rhythms, while providers diagnose and interpret.
- Troubleshooting artifact must never delay the immediate reporting of suspected life-threatening rhythms to a licensed healthcare provider.
- Somatic tremor produces irregular, jagged baseline spikes from muscle tension, shivering, or Parkinson's disease, and can mimic ventricular fibrillation or tachycardia.
- Wandering baseline stems from respiratory movement, tension on lead wires, dried gel, or skin barriers, and is resolved by thorough skin cleansing, abrasion, and fresh electrodes.
- In North America, mains AC interference typically produces approximately 60-Hz oscillations and may result from mains-powered equipment or electrical faults; personal electronics can cause electrical artifact at other frequencies.
- A flat trace across all leads requires immediate patient assessment and pulse checks before inspecting for broken wires, disconnected clips, or detached electrodes.
- Preserve standard machine frequency response whenever possible, document any electrode position deviations or persistent artifact, and notify the clinician if quality tracings cannot be obtained.
Practice this section
Explained EKG EKG Acquisition questions, no account needed. EKG EKG Acquisition practice test
The full lesson continues with 4 more sections with exam tips, audio in English and Spanish, 5 Check yourself questions and 20 flashcards.
- 1 month
$38.99$19.49 - 3 months
$113.99$56.99 - Lifetime
$233.99$116.99
One payment, no subscription.
See EKG plansAlready a member? Log in
Sample lesson: Heart Position, Lead Systems and Lead Types25 practice questions on this exam
Each EKG practice test has 25 original questions with the answers explained. No account needed.
Open the EKG practice testsOriginal lesson written for EKG practice · updated October 31, 2026. Exam names are trademarks of their owners; tests.global is not affiliated with them.