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.
 Timex T5G971 Unisex Sports Personal Heart Rate Monitor Watch List Price: Sale Price: $40.99 You save: $28.96 (41%)  Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionCombining stylish looks with heart rate monitoring features, this larger Timex Personal Heart Rate Monitor watch (model T5G971) can be worn by both men and women. It features a chest strap heart rate monitor, easily accessible function buttons, durable resin case, and comfortable resin strap with a stylish tapered profile...  |
 Omron HR-100C Heart Rate Monitor List Price: Sale Price: $32.99 You save: $27.00 (45%) Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionThe Omron HR-100C Heart Rate Monitor is easy to program and a cinch to wear with a ventilated watch band. Knowing your heart rate is important because if you're working out too hard, your activity can actually become counter productive and strain or damage muscles... |
 Garmin Forerunner 305 GPS Receiver With Heart Rate Monitor List Price: Sale Price: $144.00 You save: $155.99 (52%) Eligible for free shipping!Availability: Usually ships in 1-2 business days See Reviews For This Product DescriptionAmazon.com Product Description The successor to the Garmin Forerunner 301 is here, and it's better than ever. Weighing in at just over 2.5 ounces, the Garmin Forerunner 305 breaks new ground in terms of comfort, style, and performance... |
 Timex T5G941 Heart Rate Monitor Watch List Price: Sale Price: $31.58 You save: $28.37 (47%) Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionThe affordable, entry-level Timex T5G941 is great for those just starting out with heart rate monitoring. This digital wristwatch-style monitor continuously tracks your heart rate via a comfortable, elastic chest strap (which fists chest sizes from 25 to 53 inches)... |
 Timex T5J031 Unisex Digital Fitness Heart Rate Monitor Watch List Price: Sale Price: $65.85 You save: $34.10 (34%) Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionCombining stylish looks with power sport timing and heart rate monitoring features, this mid-sized Timex Digital Fitness watch (model T5J031) can be worn by both men and women. It features a chest strap heart rate monitor, easily accessible function buttons, durable resin case, and comfortable resin strap with a stylish tapered profile... |
 Polar FS2C Heart Rate Monitor List Price: Sale Price: $45.80 You save: $24.15 (35%) Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionGet your fitness up and running with the Polar FS2c wrist-mounted heart rate monitor. The FS2c is a breeze to use, with a wide variety of heart rate functions that tell you just how well your workout is progressing... |
 Garmin Heart Rate Monitor List Price: Sale Price: $32.99 You save: $27.01 (45%) Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionGARMIN 0101099700 Heart Rate Monitor. This digital heart rate monitor continuously tracks heart beats per minute which is wirelessly transmitted to the Forerunner 50. Effectively tracks and records your heart rate while you work out, providing instant feedback about how hard your heart is working... |
 Timex T5H881 Zone Trainer Digital Heart Rate Monitor List Price: Sale Price: $55.95 You save: $44.00 (44%) Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionCombining stylish looks with power sport timing and heart rate monitoring features, this larger Timex Digital Fitness watch (model T5H881) can be worn by both men and women. It features a chest strap heart rate monitor, easily accessible function buttons, durable resin case, and comfortable resin strap with a stylish tapered profile... |
 Polar RS100 Heart Rate Monitor and Stopwatch List Price: Sale Price: $75.25 You save: $44.70 (37%) Eligible for free shipping!Availability: Usually ships in 1-2 business days See Reviews For This Product DescriptionIn order to reach your fitness goals, you need to exercise at the right intensity. The Polar RS100 wrist heart rate monitor helps you to easily and accurately measure your heart rate to help you get to just the right intensity or your exertion level... |
 Polar FS1 Heart Rate Monitor Watch (Dark Blue) List Price: Sale Price: $43.77 You save: $26.18 (37%) Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionThe stylish Polar FS1 heart rate monitor helps you to easily and accurately measure your heart rate to help you get to just the right intensity or your exertion level. This basic HRM features added stopwatch and time-of-day watch features, extra-large digits for easy readability, and one-button functionality... |
