hypertension
TRANSCRIPT
Hypertension
Dr Urmila Aswar
Location of the Heart
The heart is located between the lungs
behind the sternum and above the
diaphragm.
It is surrounded by the pericardium.
Its size is about that of a fist, and its weight
is about 250-300 g.
Its center is located about 1.5 cm to the left
of the midsagittal plane.
Anatomy of heart
Anatomy of the heart
The walls of the heart
are composed of
cardiac muscle, called
myocardium.
It consists of four
compartments:
the right and left atria
and ventricles
Blood circulation via heart
• The blood returns from the systemic circulation to the right
atrium and from there goes through the tricuspid valve to the right
ventricle.
• It is ejected from the right ventricle through the pulmonary valve
to the lungs.
• Oxygenated blood returns from the lungs to the left atrium, and
from there through the mitral valve to the left ventricle.
• Finally blood is pumped through the aortic valve to the aorta and
the systemic circulation..
HypertensionHypertension means high blood pressure. High
blood pressure is an increased pressure in blood
vessels.
It can be caused by many factors such as stress,
high cholesterol, and inactivity. It is classified
into mild, moderate, and severe hypertension.
The mild, moderate, or severe hypertension,
have an increased risk of having a heart attack
or a stroke.
Types of hypertension
In 90-95% of patients presenting with
hypertension, the cause is unknown. This
condition is called primary (or essential)
hypertension. The remaining 5-10% of
hypertensive patients have hypertension that
results secondarily from renal disease, endocrine
disorders, or other identifiable causes. This form
of hypertension is called secondary
hypertension.
Hemodynamic basis of hypertension
Blood pressure levels are a function ofcardiac output multiplied by peripheralresistance (the resistance in the bloodvessels to the flow of blood).
Heart rate, stroke volume
Vascular tone
Hypertension
1/3/2014 11
Hypertension
The major factors which help maintain blood pressure (BP) include the sympathetic nervous system and the kidneys.
Optimal healthy blood pressure is a systolic blood pressure of <120 mmHg and a diastolic blood pressure of <80
<120/80.
Hypertension
Category Systolic Blood
Pressure
Diastolic Blood
Pressure
Normal < 120 <80
Pre-hypertension 120-139 80-89
Hypertension –
Stage 1
140-159 90-99
Hypertension –
Stage 2
>160 >100
Hypertension
As many as 2.8 million children also have
high blood pressure.
The prevalence of hypertension increases
with age.
Prevalence of Hypertension by
Age
Age
18-29
30-39
40-49
50-59
60-69
70-79
80+
% Hypertensive
4
11
21
44
54
64
65
Hypertension
When the normal regulatory mechanisms
fail, hypertension develops.
Hypertension is dangerous because it gives
off no warning signs or symptoms.
Untreated hypertension can result in:
Arteriosclerosis --Kidney damage
Heart Attack --Stroke
Enlarged heart --Blindness
Factors Influencing the Development of
Hypertension
High-normal blood pressure
Family history of hypertension
Overweight
Factors Influencing the Development of
Hypertension
Excess Consumption of Sodium Chloride
Certain segments of the population
are ‘salt sensitive’ because their
blood pressure is affected by salt
consumption
Factors Influencing the Development of
Hypertension
Exercise: Less active
individuals are 30-50% more
likely to develop hypertension.
Alcohol consumption
Factors Influencing the Development of
Hypertension
Other Dietary Factors
Potassium:
Calcium:
Magnesium:
Treatment for Hypertension
Maintain a healthy weight, lose weight if
overweight.
Be more physically active.
Drink alcoholic beverages in moderation.
Reduce the intake of salt and sodium in the
diet to approximately 2400 mg/day.