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Blood pressure-Ricky Hellyar

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richard hellyar

on 11 November 2015

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Transcript of Blood pressure-Ricky Hellyar

Blood Pressure-
R.Hellyar & A.Santos

What is blood pressure?
Let's think about us now!
Blood Pressure = Peripheral resistance x Cardiac Output
BP = PR X CO
Quick question for you, why 2 numbers?
BP= PRxCO
Cardiac Output
Terms to familiarise yourself with:

CO (ml/min)
Heart Rate
Stroke Volume
HR x SV = CO

Chronotropic factors
Pre-load, after-load and contractility
Frank-Starling law.
SVR
SVR=Systemic Vascular Resistance
Peripheral Resistance or SVR


Resistance offered by the arterial system (not pulmonary)
Lumen-constriction/dilation

Blood viscosity

Vessel length
There are multiple feedback mechanisms-

Anti-Diuretic Hormone- BP low, stimulates kidneys to conserve water. (Osmoreceptors)

Atrial Peptide-Atria overstretched, stimulates kidneys to lose water. (Baroreceptors)

Renin-angiotensin-aldosterone system
It's not easy, you have to read! You will get it!
We are constantly in a state of change
Aim

Gain an understanding of Blood Pressure

What it is, what alters it!
Please stand up!
Form a rugby tunnel.
Now for a little experiment!
Up a level
Consider Circulating Volume
Full transcript