Mod D Tech 14 Blood Pressures Flashcards Preview

Technician Course MOD D 2016 > Mod D Tech 14 Blood Pressures > Flashcards

Flashcards in Mod D Tech 14 Blood Pressures Deck (11):
1

What is blood pressure?

Blood pressure is the force of blood against the walls of blood vessels

Recorded as two numbers:

Systolic

Diastolic

 

2

Blood pressure Terminology

•Hypotension

••Hypertension

••Postural Hypotension

••Pulse Pressure

•Mean Arterial Pressure

–MAP = Diastolic + 1/3 Pulse pressure

3

average Blood pressures

A image thumb
4

Factors involved in maintaining BP

•Cardiac output

••Blood volume

•Peripheral resistance

••Elasticity of the arteries

••Viscosity

••Venous return

ØMuscular contraction

ØSuction during inspiration

5

Cardiac output

The volume of blood ejected from the left ventricle  into the aorta each minute.

Cardiac Output (CO) = Stoke Volume (SV) x Heart Rate (HR)

In a typical resting adult male, cardiac output is CO

(4.9 l/min) = 70 x 70 = 4900ml/min

6

Blood volume

•Blood pressure also depends on the total volume of blood in the cardiovascular system.

•Normal blood volume is approx 70ml/kg lean body mass in an adult and 80ml/kg in children

 

•Therefore 70ml/kg x 70kg = 4900ml

•It is usual to round this up to approx 5 litres

   (can increase by up to 50% during pregnancy)

7

Control of blood pressure

Short term regulation:

•Baroreflex mechanism

•Hormone

Long term regulation:

•Blood volume

•Hormones

•Kidney

•Microcirculation.

8

Some factors that increase blood pressure

•Heredity

•Race

•Age

•Sedentary or inactive lifestyle

•Heavy alcohol consumption

•Obesity and overweight

•Stress

9

Some factors that decrease blood pressure

•Abnormal heart rhythms

••Alcohol

••Antidepressants, such as amitriptyline

 

•Some allergic reactions

••Calcium channel blockers

••Nitrates

10

How to obtain a Blood Pressure

•Relax patient

•Locate brachial pulse in antecubital fossa (ACF)

•Place correctly sized cuff

•Palpate radial pulse

•Inflate cuff

•Feel pulse disappear

•Place diaphragm of stethoscope on previously located brachial pulse in ACF

•Release pressure listen for sounds

11

Pulse Pressure

Pulse pressure is the difference between Systole and Diastole e.g.

•BP = 120mmHg  :- Pulse Pressure = ?

             80mmHg

40mmHg