gazeygoo
No way to compute that from the BP. EMT Paramedic

Elizabeth4488
The blood pressure is a result of the heart rate and peripheral vascular resistance (how contracted your blood vessels are) and as others have rightly said, you cannot calculate your HR based on BP. However, it is reasonable to assume that a higher BP is (at least in part) caused by a higher HR

Alice
It's impossible to calculate someone's pulse from their blood pressure. For example one person could have a BP of 120/80 with a pulse of 50 and another person could have exactly the same BP and have a pulse of 80. Your assignment is either a trick question or your teacher doesn't know much about the human body.

Huguette
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 ÷ 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.

Cosimo
And if the cardiac output wasn't the same?