Jiaogulan Herb
Blood Pressure
is the pressure
exerted by the blood
at right angles to the walls of the blood
vessels. Unless indicated otherwise, blood
pressure refers to systemic arterial blood
pressure, i.e., the pressure in the large arteries
delivering blood to body parts other than the
lungs, such as the brachial
artery (in the arm). The pressure of the blood
in other vessels is lower than the arterial
pressure. Blood pressure values are universally
stated in millimetres
of mercury (mmHg). The systolic
pressure is defined as the peak pressure in the
arteries during the cardiac
cycle; the diastolic
pressure is the lowest pressure (at the resting
phase of the cardiac cycle). The mean
arterial pressure and pulse
pressure are other important quantities.
Typical values for a resting,
healthy adult human are approximately 120 mmHg
systolic and 80 mmHg diastolic (written as
120/80 mmHg, and spoken as "one twenty
over eighty"), with large individual
variations. These measures of blood pressure are
not static, but undergo natural variations from
one heartbeat to another or throughout the day (in
a circadian
rhythm); they also change in response to stress,
nutritional factors, drugs,
or disease.
Jiaogulan herb Reduce high blood
pressure presents a risk of human heart attack,
thrombosis or stroke, low blood pressure is
associated with fainting or collapse resulting
from poor circulation to the human brain.
Jiaogulan Herb can help establishing and
maintaining a healthy level of Your blood pressure
in such
High arterial
pressure
-
Main article: Hypertension
The diagnosis of abnormalities in
arterial pressure may require serial measurement.
Since arterial pressure varies throughout the day,
measurements should be taken at the same time of
day to ensure the readings taken are comparable.
Suitable times are:
- immediately after awakening (before washing/dressing
and taking breakfast/drink), while the body is
still resting,
- immediately after finishing work.
It is sometimes difficult to meet these
requirements at the doctor's office; also, some
patients become nervous when their arterial
pressure is taken at the office, causing readings
to increase (this phenomenon is called white
coat hypertension). Taking blood pressure
levels at home or work with a home
blood pressure monitoring device may help
determine a person's true range of arterial
pressure readings and avoid false readings from
the white
coat hypertension effect. Long term
assessments may be made with an ambulatory
blood pressure device that takes regular
arterial pressure readings every half an hour
throughout the course of a single day and night.
Aside from the white coat effect, arterial
pressure readings outside of a clinical setting
are usually slightly lower in the majority of
people. The studies that looked into the risks
from hypertension
and the benefits of lowering the arterial pressure
in affected patients were based on readings in a
clinical environment.
Arterial pressure exceeding normal values is
called arterial
hypertension. In itself it is only an acute
problem; see hypertensive
emergency. But because of its long-term
indirect effects (and also as an indicator of
other problems) it is a serious worry to
physicians diagnosing it.
All levels of arterial pressure put mechanical
stress on the arterial walls. Higher pressures
increase heart workload and progression of
unhealthy tissue growth (atheroma)
that develops within the walls of arteries. The
higher the pressure, the more stress that is
present and the more atheroma
tend to progress and the heart muscle tends to
thicken, enlarge and become weaker over time.
Persistent hypertension
is one of the risk factors for strokes,
heart
attacks, heart
failure, arterial aneurysms, and is the
leading cause of chronic
renal failure. Even moderate elevation of
arterial pressure leads to shortened life
expectancy. At severely high pressures, mean
arterial pressures 50% or more above average, a
person can expect to live no more than a few years
unless appropriately treated.[20]
In the past, most attention was paid to diastolic
pressure; but nowadays it is recognised that both
high systolic
pressure and high pulse
pressure (the numerical difference between
systolic and diastolic pressures) are also risk
factors. In some cases, it appears that a decrease
in excessive diastolic pressure can actually
increase risk, due probably to the increased
difference between systolic and diastolic
pressures (see the article on pulse
pressure).
Low arterial pressure
-
Main article: Hypotension
Blood pressure that is too low is known as hypotension.
The similarity in pronunciation with hypertension
can cause confusion.
Low arterial pressure may be a sign of severe
disease and requires urgent medical attention.
When arterial pressure and blood flow
decrease beyond a certain point, the perfusion
of the brain becomes critically decreased (i.e.,
the blood supply is not sufficient), causing
lightheadedness, dizziness, weakness and fainting.
However, people who function well, while
maintaining low arterial pressures have lower
rates of cardiovascular disease events than people
with normal arterial pressures.[citation
needed]
Influential factors
The physics of the circulatory system, as of
any fluid system, are very complex. That said,
there are many physical factors that influence
arterial pressure. Each of these may in turn be
influenced by physiological factors, such as diet,
exercise, disease, drugs or alcohol, obesity,
excess weight and so-forth.
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