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Pulse Heart

Wednesday, September 8th, 2010

Pulse Heart

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What is the connection between ones pulse-rate/heart-beat and blood pressure?

Just wanted to understand if the blood pressure decreases if the heart rate slows down and vice-versa. Similarly, does an increase in pulse-rate signify an increase in blood pressure?

The short answer to both your questions is "no" - it doesn't work like that.

But both your systolic and diastolic pressures are directly related by very simple mathematical equations to your pulse rate. If you want to know them, then feel free to email me.

EDIT: I'm sorry to have to contradict you Melmo, but you are quite mistaken. The pulse rate is inextricably linked to all the blood-pressures and the mutual relationships between them are crucial to understanding how they work. They govern when BP's rise if pulse rate rises, and when they fall instead. They determine why and when BP
sometimes they stay the same. And they show why and how they frequently do the opposite thing, -one falling while the other rises...

These relationships are so precise that they may be expressed algebraically. Simply not knowing what they are is not grounds, -surely, for saying they don't exist? All it means is that, despite the fact they have been staring you in the face for over a hundred years, you (and in fairness, the whole of the medical profession too!) haven't recognized them.
As Levick said, "In a subject so complex as cardiovascular Physiology it is often difficult to see the wood for the trees."

I'm not sure what you do "in the medical field" but I extend the same warm invitation to you as I did to the asker of the question, to email me, and nothing would give me greater pleasure than to show you what you say doesn't exist -the precise relationship between pulse rate, systolic, diastolic, and pulse pressures.

Further, I'd love dearly to show you the relationship between pulse rate and so-called "mean arterial pressure", - but sadly, it doesn't exist, except in the minds of the collective imaginations of doctors and the medical profession.

Now, -I can well envisage you asking what the difference is between me asserting something doesn't exist and you asserting something doesn't exist?

The answer is simple. I'm blind to the trees, but I have a perfect view of the wood ! - I'm a Physicist, not a doctor, and come to the subject unencumbered with all the extraordinary baggage of tosh taught to students by Old Doctors too intellectually idle to ask the question "Why?", when the numbers don't add up, and just let it go with the feeble "Well.. It's not precise science, you know.."

EDIT: Helen. - Yes, it is {Pd = N x Pp x C x R} where Pd is diastolic pressure.
N is pulse rate, Pp is pulse pressure, C is the aortal wall compliance, and R the total resistance to flow presented by the vascular loop between the aortic valve and the venous pool.

EDIT: -Helen. In reply to your two questions, the equation is only the Law of Flow (corrected, to eliminate the mistakes of orthodox medicine, -but it works even if the mistakes aren't corrected).
Thus (N x Pp x C) equals cardiac output CO, and the pressure difference required to drive this (CO) across a total resistance R is R/CO..
(Not so-called "TPR" incidentally)

Q.E.D.

As regards your second question, no, Pd doesn't necessarily rise if pulse rate N rises -especially at rest. It's entirely dependent on cardiac output and how it's handled by vasodilatation (& constriction of course). If CO remains constant (as it essentially does at rest) then N and R simply vary inversely as each other, and this keeps both sides of the equation balanced. This explains why under relaxed conditions diastolic pressure stays virtually constant.