Heart Rate
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How to calculate heart rate from BP readings on a home digital monitor?
Assignment is to calculate what the heart rate will be when a home digital monitor is used to measure BP on a subsequent occasion? If BP is 145/78 with a pulse of 72 bpm, what will the Pulse Rate be when BP is 160/85 when read on a subsequent occasion?
It's possible, but not straightforward. You have to assume cardiac output remains unchanged.
Then if (empirical) CO = 4824ml/min the new pulse rate (HR) must be (4824 รท 75), or 64.4 bpm.
You can calculate heart rate from BP providing cardiac output is known. But as both pulse pressure and heart rate vary with CO, if you don't know cardiac output you can't do the calculation.
That's why you'll have to assume CO remains the same for both readings.
EDIT: It would have been more sensible and transparent if the wording of the question had been " If the patient's BP reading was monitored as 145/78 with a pulse rate of 72 bpm, what would his pulse rate have been if his BP had been 160/85?".
This avoids any ambiguity, and the answer is then straightforward, 64.4 bpm.
EDIT: Good question. There is a direct linear relationship between heart rate and cardiac output, so the answer would be 64.4 bpm multiplied by the ratio of the later CO to the original. So, for instance, if the later cardiac output was (say) 5306 mils/min, then the heart rate would be roughly
(1.1 x 64.4) or 70.8 bpm.
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