Transcript Blood Pressure - Anoka-Hennepin School District 11

Blood Pressure
• Pressure in arteries exerted by the left
ventricle when it undergoes systole
(contraction) and the pressure remaining in
the arteries when the ventricle is in diastole
(relaxation)
• Taken in the left brachial artery
Systolic Pressure
• First sound – corresponds to systolic blood
pressure.
• The force when blood is pushing against the
arterial walls
• Normal – 100 + age
Diastolic
• Last sound – when the sound becomes faint
• Measure the force of blood remaining in the
arteries during ventricular relaxation
• Normal – 60-80
• Normal Blood Pressure – 120 / 80
Pulse
• Alternate expansion and elastic recoil of an artery
with each contraction of the left ventricle.
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Radial artery – wrist
Carotid artery – next to voice box
Popliteal artery – behind knee
Dorsalis pedis artery – above the instep of foot
Pulse
• Average Pulse – 70-80 beats/min at rest
• Tachycardia – rapid heart/pulse over 100/min
• Bradicardia – slow heart/pulse under 60/min
Factors that determine blood Pressure
• Stroke Volume Output– the amount of blood
pumped out per beat
• Average – 70 ml per beat
• As SVO goes up, blood pressure goes up
• As SVO goes down, blood pressure goes down
Elasticity
• Constricted arteries – (narrow) blood pressure
goes up
• Dialated arteries – (wide) blood pressure goes
down
Things that make BP go up
• Constricted Arteries
• Quick, small heart beats
• Blood transfusions
• Areteriosclerosis
Things that cause BP to go down
• Blood loss
• Slow, strong heart beats
• Large, dialated arteries
• Kidney loss of fluids