00:01
We also have transient elevations
in our blood pressure
that occur when we change posture.
00:07
As well as through
physical exertion,
emotional upset,
or when we have a fever.
00:13
In 2017, new blood pressure categories were established based on the guidelines of the American College of Cardiology,
and the American Heart Association.
These categories refer to office-based measurements.
00:26
Normal blood pressure is now defined as a systolic pressure of less than 120 and a diastolic pressure
of less than 80 millimeters of mercury.
00:34
An elevated blood pressure, or “prehypertension,” is a systolic pressure of 120 to 129 and a
diastolic pressure of less than 80.
Stage 1 hypertension is a systolic pressure of 130 to 139 OR a diastolic pressure
of 80 to 89 millimeters of mercury.
Stage 2 hypertension is a systolic pressure of at least 140
and a diastolic pressure of at least 90.
Note that most countries other than the United States continue to define hypertension as a
systolic pressure of 140 or more or a diastolic pressure of 90 or more millimeters of mercury.
01:12
A person is considered
prehypertensive,
if the values are elevated
but are not all the way up
to what we consider
the hypertension range.
01:22
Prehypertension may be
due to transient adaptations
during a fever,
or physical exertion,
or emotional upset.
01:32
But they can also be
persistent in patients with obesity
Hypertension is going to be
prolonged hypertension
and as the major cause
of heart failure,
vascular disease,
renal failure,
and stroke.
01:46
This is because the heart
must work harder,
and therefore,
the myocardium enlarges,
and gets weaker
and becomes flabby.
01:55
This can also accelerate the process
of atherosclerosis
or the building up of fatty plaques
in our blood vessels.
02:05
Primary hypertension
is going to account for
90% of our
hypertensive conditions.
02:14
Usually there's no underlying cause
that is identified.
02:18
Risk factors include genetics, race, diet, obesity, age, diabetes mellitus, stress, and smoking
There's no cure for
primary hypertension,
but it can be controlled
by restricting
salts, fats, and cholesterol
in the diet,
increasing exercise
and losing weight
and also stopping smoking
or by antihypertensive drugs.
02:41
Secondary hypertension
is less common
and is usually due
to identifiable disorders
including an
obstructed renal artery,
kidney disease,
and endocrine disorders
such as hyperthyroidism
and Cushing's syndrome.
02:57
The treatments for
secondary hypertension
usually involve treating the
underlying cause
instead of treating
the hypertension itself.
03:06
Hypotension is low blood pressure.
03:11
And is usually considered low
when your blood pressure is
90/60 mm Hg or lower.
03:18
Hypotension is usually
not a concern,
unless it leads to an inadequate
blood flow to your tissues.
03:26
And actually,
hypotension has been associated
with longer life
and in lack of
cardiovascular illnesses.
03:35
There are different types
of hypotension.
03:39
We have orthostatic hypotension,
which is a temporary
low blood pressure and dizziness
when you suddenly rise from sitting
or from a reclining position,
such as when you stand up
too fast.
03:52
Then we have chronic hypotension.
03:55
This usually hints at poor nutrition
and could be warning signs
for other diseases,
such as Addison's disease
or hypothyroidism.
04:05
Acute hypotension is usually
going to be an important sign
of circulatory shock.
04:13
So what is circulatory shock?
This is a condition
where our blood vessels
are going to inadequately fill
and therefore
cannot circulate our blood normally
through the body.
04:23
This inadequate blood flow then
cannot meet our tissues needs.
04:29
Another type of shock is
hypovolemic shock.
04:33
This results from
large scale blood loss
such as during a hemorrhage.
04:38
We also have vascular shock.
04:42
This results from extreme
vasodilation
and decrease peripheral resistance.
04:48
And finally, we have
cardiogenic shock,
which results when an
inefficient heart
cannot sustain
adequate circulation.