Weakness or dysfunction of the cardiac nerves; nerve-related cardiac weakness or abnormal nerve function of the heart.
From Greek 'kardia' (heart) + 'neuron' (nerve) + '-ia' (condition). The 'neuro-' root pervades medicine because so many diseases involve nerve malfunction—the nervous system is the body's electrical system.
Ancient physicians didn't know nerves existed until dissection revealed them—once they did, medical terminology exploded with 'neuro-' compounds because suddenly they could blame invisible nerve damage for conditions previously blamed on spirits or imbalances.
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