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EKG interpretation is a fundamental clinical skill that involves systematic analysis of the heart's electrical activity to diagnose cardiac conditions and arrhythmias. Healthcare providers must master the recognition of normal sinus rhythm and identify pathological changes in rate, rhythm, axis, and morphology that indicate underlying cardiac pathology.
The EKG records electrical depolarization and repolarization waves as they propagate through the cardiac conduction system, from the sinoatrial node through the atria, AV node, and ventricular myocardium. Abnormalities in conduction pathways, ischemia, electrolyte imbalances, or structural heart disease alter these electrical patterns, creating characteristic changes in waveform morphology, intervals, and rhythm.
Systematic EKG interpretation follows a structured approach: assessing rate and rhythm, evaluating P-wave morphology and PR intervals, analyzing QRS width and morphology, examining ST segments and T waves, and calculating the cardiac axis. This methodical evaluation enables clinicians to differentiate between benign variants and pathological findings requiring immediate intervention, such as STEMI, heart blocks, or life-threatening arrhythmias.