Tachycardia
Heart rate exceeding 100 beats per minute; may indicate fever, pain, dehydration, hemorrhage, anxiety, or cardiac arrhythmia.
The body uses tachycardia as a compensatory mechanism to maintain cardiac output when stroke volume falls. Persistent tachycardia increases myocardial oxygen demand and can lead to ischemia.
(Placeholder study content — expanded in the content build step.)
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