6.2 EKG Artifact Troubleshooting

The Four Artifacts and How to Read Them

Artifact is any waveform on the tracing that is not produced by the heart. It can hide or mimic real findings, so a CCMA must recognize the pattern, identify the cause, fix it, and re-run before routing the study. NHA scenarios usually describe the appearance and ask for the cause or correction.

The distinguishing test: regular vs. irregular fuzz. AC interference is uniform and regular (mains frequency); somatic tremor is irregular and patient-driven. A single dead lead pointing to a broken wire or electrode in that limb/position indicates broken-lead artifact, not a whole-tracing problem.

Targeted Fixes and the QC Workflow

Match the fix to the cause rather than guessing:

1. Wandering baseline - re-prep skin (clean oils, abrade dry skin), replace dried electrodes, resecure loose leads, and ask the patient to hold still and breathe quietly. Slow respiratory sway is normal-ish but excessive drift needs correction.
2. Somatic tremor - warm a cold/shivering patient with a blanket, support the arms and legs so muscles relax, reassure an anxious patient, and address pain. For a resting tremor (e.g., Parkinson's), place limb electrodes more proximally on less tremulous areas per policy.
3. AC interference - unplug or move nearby equipment, ensure the machine is on a grounded outlet, uncross and untangle lead wires, keep cables from draping over metal bed rails, and confirm electrodes are firmly attached.
4. Broken-lead artifact - identify which single lead is affected, reseat or replace that electrode, and inspect the cable for cracks.

Quality-Control Rule

In a stable patient, artifact is a quality problem - correct it and repeat the tracing before accepting or routing. Never file an uninterpretable strip as "final" because the machine printed measurements; the machine's automated interpretation is unreliable over heavy artifact. If the patient is symptomatic or unstable, patient care and escalation come first (see 6.3) - do not delay help to chase a clean baseline.

Common Traps Tested

• Confusing regular AC fuzz (electrical) with irregular somatic tremor (muscle) and applying the wrong fix.
• Accepting a wandering, drifting tracing as adequate.
• Re-running the EKG repeatedly without fixing the underlying cause (loose electrode, oily skin).
• Ignoring artifact because the device printed an interpretive statement.

Worked example: A patient's tracing shows a fine, perfectly uniform fuzzy line across all leads in a room full of equipment. This pattern points to 60-Hz AC interference - move/unplug nearby devices, verify grounding, and untangle cables. Warming the patient (a tremor fix) would not help because the fuzz is regular, not irregular.

A Systematic Troubleshooting Order

When artifact appears, work outward from the patient to the equipment so you do not waste time:

1. Patient: Are they moving, cold, tense, talking, or in pain? Most artifact starts here.
2. Skin and electrodes: Are sites clean, dry, abraded, and hair-free? Are electrodes fresh and firmly stuck? Dried gel is a frequent silent cause.
3. Lead wires and cable: Are connections snug, wires untangled and uncrossed, and the cable free of cracks or kinks?
4. Environment: Is the machine grounded, and are other devices, cords, or the bed rail introducing electrical noise?

Fixing in this order resolves the large majority of cases before you ever touch the machine settings. Most EKG machines also have filters, but a CCMA should correct the cause, not simply enable a filter that may smooth over a clinically important signal.

Why the Automated Interpretation Is Not Enough

Modern EKG units print a computer-generated interpretive statement. Over heavy artifact, that algorithm can call normal beats abnormal or miss real abnormalities, because it cannot distinguish muscle tremor from a true arrhythmia the way a clean tracing allows. The CCMA never relies on the machine's printout to decide the strip is acceptable; the human judgment is whether the waveforms themselves are clean enough for the provider to interpret. If repeated correction still leaves an uninterpretable strip, escalate to the provider or supervisor rather than filing it - document what you tried and why the tracing remains poor.

Equipment Care That Prevents Artifact

Preventive maintenance reduces artifact before it starts: store lead wires hanging or loosely coiled (never tightly wrapped, which cracks insulation), inspect cables for fraying, keep a stock of in-date electrodes, and clean the machine per policy. A cracked lead wire is a recurring cause of single-lead artifact that re-prepping skin will never fix - replace it.

Distinguishing Artifact From Real Findings

The most dangerous mistake is confusing artifact with a genuine arrhythmia, or vice versa. Somatic tremor can superficially resemble fine ventricular fibrillation, but a tremor patient is awake, talking, and has a normal pulse - a true V-fib patient is pulseless. When the waveform looks alarming, the CCMA correlates it with the patient: an alert, comfortable patient with a strong pulse points to artifact, not emergency. This is why patient assessment always accompanies tracing review. If the waveform is concerning and the patient is symptomatic, treat it as an emergency and escalate (see 6.3) rather than dismissing it as artifact.

Documentation After Correction

When a tracing required correction, the chart should reflect what was done: note that artifact was present, the corrective steps taken, and that an acceptable repeat tracing was obtained and routed. If artifact could not be eliminated, document the attempts and the escalation. Clean, honest documentation keeps the next clinician informed and shows the study was quality-checked, not blindly filed.