An involuntary spasm or severe contraction of the cardiac muscle or the opening of the heart.
Greek 'kardia' (heart) + 'spasmos' (spasm, involuntary contraction), a medical term describing uncontrolled heart muscle contractions. Often used historically to describe what we now call cardiac arrhythmias or esophageal spasm near the cardia.
Cardiospasm in the cardia (the opening where the esophagus meets the stomach) is actually achalasia, and it's fascinating because the heart and esophagus sit so close together that early doctors confused their spasms—showing how anatomy and function are intimately connected.
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