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The presence of alternating amplitudes of QRS complexes is distinctly identified as electrical alternans. This phenomenon typically occurs due to changes in the position of the heart within the thorax, often linked to conditions such as pericardial effusion or large pleural effusions. When the heart shifts between different positions due to these fluid collections, it can produce alternating height in the electrical activity as measured on an electrocardiogram, leading to the characteristic finding of electrical alternans.

This feature is particularly significant in a clinical context, as it can indicate serious underlying conditions such as cardiac tamponade, where fluid accumulates in the pericardial space, affecting the heart's function and necessitating prompt medical intervention. Understanding this diagnostic feature helps clinicians rapidly assess and manage patients presenting with symptoms likely to relate to such conditions.