00:02
Now, we know how to get an accurate
systolic and diastolic pressure,
because we use that blood pressure
cuff with a sphygmomanometer
to measure these 2 pressures.
00:13
Now, I want to talk to you about what is the
difference between systolic and diastolic?
Systolic pressure is the number
that's listed on the top.
00:22
Diastolic pressure is the number
that's listed on the bottom.
00:25
So when you see a normal blood pressure
reading, you'll see the number like,
for example, the perfect blood pressure,
120/…we call that over…the number 80.
00:36
So that's the systolic pressure
over the diastolic pressure.
00:40
Now, let's talk about how those
pressures are different.
00:43
The systolic pressure is the
measurement of the force of blood
pumping out of the heart into the arteries.
00:50
So, for lack of a better model,
right now, I'm going to use my hand
and you pretend that this is a heart.
00:56
So this is systolic pressure,
my heart is contracting.
01:00
That's what systolic pressure is.
01:02
This is when it's working the hardest,
and that's the measurement of the force
as the blood pumps out of the heart
and into the arteries, right?
So systolic, systolic, systolic, systolic.
01:17
Now, diastolic is the blood
pressure measurement of
the heart as it can…rests, okay?
So, systolic, diastolic, systolic,
diastolic, systolic, diastolic.
01:30
It's when the…in between the heartbeats.
01:33
This is…pushing blood out to the rest of the body.
01:36
This…is the heart getting its blood supply.
01:40
Blood out to the rest of the body…
Heart getting its blood supply.
01:45
Systolic, diastolic, systolic,
diastolic, systolic, diastolic.
01:51
I know that's probably kind
of annoying by this point,
but I want you to be very solid
on what is the difference between
that top number and the bottom number?
The top number in a blood pressure
reading is a systolic pressure; this.
02:05
The bottom number of the reading
is the diastolic pressure; this.
02:09
So, when does my heart get its
perfusion of oxygen, here or here?
Now, you see me using my hand, but actually,
that's a really good way to
trigger and focus your brain.
02:20
So, wherever you are and
you're watching this video,
I want you to stop for a minute and
just think about that; systolic…
No, no, I mean, not just think
about it, actually use your hand.
02:30
Systolic, diastolic systolic,
diastolic, systolic, diastolic.
02:36
Now you know why those 2
pressures are so important,
and why we get really concerned about
that diastolic pressure being elevated,
because we know the heart is
really taking a hit during that.
02:49
Okay.
02:50
Now, when you actually take a blood
pressure, this is kind of cool.
02:52
So, look at this first picture.
02:54
You see the 120/80, there.
02:57
That's systolic pressure
over diastolic pressure.
03:00
Systolic pressure of 120,
diastolic pressure of 80.
03:05
You got a normal blood flow in the arm.
03:07
You've asked the patient if they've
exercised, drank caffeine or alcohol,
or smoked 30 minutes before the test.
03:14
They've had their arm resting comfortably.
03:16
They waited 5 minutes.
03:17
You have the appropriate size cuff on their arm.
03:20
It's above the bend in their elbow, and
we're ready to take their blood pressure.
03:23
Now, you see in the drawing
you have normal blood flow.
03:26
There's no occlusion of blood
flow before we inflate the cuff.
03:31
Now when you inflate the cuff,
now you can see in the picture,
that's a manual one where you have to…
you have to turn the screw to close it off,
and then squeeze the bulb to press it,
and that will fill the cuff up with
air until it occludes that artery.
03:45
That's what we're looking at doing.
03:46
So the cuff pressure blocks off the blood flow.
03:49
So now while you have the cuff on the patient,
there, the rest of their arm is not being perfused
which is why you want to be efficient
when you take their blood pressure.
03:59
It can be somewhat uncomfortable
for your patient.
04:02
Now, when you're in nursing lab,
they'll go over very specific steps with
you on how you listen and when you listen.
04:08
We're just kind of giving you a quick
overview of these different pressures.
04:12
So, now, the systolic pressure
equals the cuff pressure.
04:15
So, when you place your stethoscope
here on the place that you assessed,
when you put your stethoscope there,
we're listening for the first beat, right?
The first time we can hear that…love dub,
or as they say in Germany, boom, boom,
when you hear that first, that's the
systolic pressure, the systolic pressure.
04:36
In the example of 120/80, that's
going to be the systolic pressure.
04:41
Now you listen until it disappears
or gets extremely muffled.
04:45
That is the diastolic pressure.
04:48
So, as you're taking a patient's blood pressure,
just be aware of what those
numbers and sounds mean.
04:54
And make sure that you…
make sure you deflate that cuff completely and
let that blood flow return to the patient.
05:01
Because you've completely occluded the
blood flow when you take a blood pressure,
it's not a good idea to go, "Argh, that didn't work."
Pump it up right away.
05:09
You want to give that arm time to really
rest and to really fill back up again.
05:14
So, don't take measurements
repeated right after each other.
05:17
Make sure you have several minutes in
between blood pressure measurements.
05:20
Anytime you question a measurement, recheck it.
05:23
That's always a really good idea.
05:25
Ask the patient if they know what
their normal blood pressure is.
05:28
If you're reading seems significantly
different than what their normal is,
note their other vital signs
and see if you can start to problem solve
as to what might possibly be the cause.
05:39
You know, if I have somebody come in and
their normal blood pressure is 118/90,
and all of a sudden, they're at 98/70, and
their heart rate's going really fast,
my first worry is going to be,
"I wonder if there dehydrated."
Because when they have lower volume…oh, I've got
lower volume, so I have a lower cardiac output.
06:00
So what the heart does is, "Whoa, I've got
less volume to push around," so it speeds up.
06:04
It tries to go faster.
06:05
It tries to move around whatever
little volume it has much faster.
06:08
So if I've got somebody who's got a
significant drop in their blood pressure,
I suspect that they have lower volume
on board and their heart rate is up.
06:17
Those are all signs that my patient
might be hypovolemic or low on volume.
06:23
Now, we'll delve more into that
when we talk about the IV video,
so you want to check that one out
because we can talk about how IV
fluids really impact fluid volume.