HEMODYNAMICS
THE BASICS
To Understand Hemodynamics, 1st you have to know
this...
d flow
The bloo
eart.
h
e
h
t
h
g
throu
LEFT
SIDE OF
HEART
RIGHT
SIDE OF
HEART
CARDIAC OUTPUT:
THE AMOUNT OF
BLOOD PUMPED
THROUGH THE HEART
EACH MINUTE
STROKE VOLUME:
THE AMOUNT OF
BLOOD PUMPED
THROUGH THE HEART
WITH EACH BEAT
HEMODYNAMICS
THE BASICS
THE
BASICS
CO
R
H
X
V
S
CO=
HR
SV
preload
afterload
Preload:
The amount of
volume
stretching the
ventricle at the
end of diastole
(filling)
Aterload:
The resistanct
the LEFT
ventricle must
overcome during
systole
(pumping)
contractility
Contractility:
The force of the
heart to pump
blood out to the
body. Think of
blowing up a
balloon and then
letting it go.
So knowing this... we can say that when the heart rate changes, the
stroke volume will also to maintain CO.
HEMODYNAMICS
THE BASICS
THE BASICS
Afterload is
similiar to a
balloon being full
and tied with a
know on the end.
the ventricle has
to generate
enough pressure to
overcome that
resistance
The greater the
stretch, the
further the
balloon will fly.
This is
comparable to
contractility.
HEMODYNAMICS
THE BASICS
RIGHT
Preload
Increased by:
1. too much fluid,
volume overload.
K
2. blood
THINM
E
V O LU
transfusions
3. aggressive fluid
resuscitation
Decreased by:
1. dehydration
2. diuretics
3. blood loss
THINK
VOLUME
LEFT
Afterload
TH
P R E S IN K
SURE
Increased by:
1. atherosclerosis
2. valvular stenosis
3. systemic hypertension
4. pulmonary hypertension
Decreased by:
1. vasodilators
2. blood pressure
medications
THINK
PRESSURE