I read a review paper recently about the assessment of dehydration. The authors conclude that we don’t have very good standardised tests for dehydration, but a reasonable test is to measure heart rate when sitting, and then again immediately on standing. During dehydration the blood volume tends to be lower and blood pressure too.
On standing, there is a tendency for blood to ‘pool’ in the lower body, causing blood pressure to drop further, which may induce a reflex increase in heart rate. If the pulse rate increases by 20 beats per minute or more on standing, this is generally taken as a sign of dehydration. However, as the authors concede, this test is not a particularly reliable way of assessing dehydration, even when blood volume is significantly depleted.
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Wednesday, February 13, 2013
Is POTS / OI / NMH another form of Deyhdration?
Dr. Briffa on dehydration:
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