Isoelectric Line — ECG/EKG Terminology

Definition: The flat baseline of the ECG, representing periods of no electrical activity.

Key Facts

• Baseline reference used to detect segment elevation or depression.
• Typically assessed relative to PR segment in many interpretations.
• Baseline wander can mimic ST changes if signal quality is poor.

ECG Connection: ST interpretation depends on accurate isoelectric baseline selection.

Why It Matters: Avoiding false ischemia calls requires careful baseline and artifact assessment.