In the dehydration case, what heart rate reading indicates tachycardia?

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Multiple Choice

In the dehydration case, what heart rate reading indicates tachycardia?

In dehydration, the body loses fluid which reduces the amount of blood returning to the heart (preload). To keep blood flow to vital organs, the heart speeds up, increasing the heart rate to maintain cardiac output (CO = heart rate × stroke volume). Because dehydration lowers stroke volume, the heart compensates by beating faster, and a heart rate in the very high range reflects this compensatory tachycardia. A reading around 220 beats per minute is very high for most patients and indicates a strong compensatory response to volume loss, consistent with tachycardia in this dehydration context. In pediatric or infant patients, heart rates are naturally higher, but such an extreme rate signals significant stress from hypovolemia and the need for prompt reassessment and fluid management.

In dehydration, the body loses fluid which reduces the amount of blood returning to the heart (preload). To keep blood flow to vital organs, the heart speeds up, increasing the heart rate to maintain cardiac output (CO = heart rate × stroke volume). Because dehydration lowers stroke volume, the heart compensates by beating faster, and a heart rate in the very high range reflects this compensatory tachycardia.

A reading around 220 beats per minute is very high for most patients and indicates a strong compensatory response to volume loss, consistent with tachycardia in this dehydration context. In pediatric or infant patients, heart rates are naturally higher, but such an extreme rate signals significant stress from hypovolemia and the need for prompt reassessment and fluid management.

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