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CVRR 19 Maintenance of Arterial Blood Pressure


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Blood Pressure = Cardiac Output x Peripheral Resistance
The equation for calculating blood pressure
Windkessel effect
The name of the effect in arteries whereby their elastic walls allow a continuous flow of blood, rather than 'spurts' with individual beats
120/80 mmHg
A normal blood pressure for a healthy adult, in the appropriate units
MBP = DBP + ((SBP - DBP) / 3)
The equation for calculating mean blood pressure (MBP)
R is proportional to 1/r^4
The simplified equation for calculating arterial resistance (R)
x16
Halving the radius of a vessel increases the resistance by x[__]
Baroreceptor reflex
The name given to a negative feedback mechanism maintaining a constant arterial blood pressure
Venous capacitance
A term used to describe the total capacity of the venous system
Carotid sinus and aortic arch
The two locations of arterial baroreceptors within the body
More
When blood pressure increases, baroreceptors fire [____] action potentials
Less
When blood blood pressure decreases, baroreceptors fire [____] action potentials
50-180
Carotid baroreceptors respond to pressures between [__]-[__] mmHg
110-200
Aortic arch baroreceptors respond to pressures between [__]-[__] mmHg
Blood pressure falls, SVR increases
The baroreflex response to a fall in mean blood pressure. [_______], [_______], venoconstriction, preload increases, contractility increases and HR increases
Venoconstriction, preload increases
The baroreflex response to a fall in mean blood pressure. Blood pressure falls, SVR increases, [_______], [_______], contractility increases and HR increases
Contractility increases and HR increases
The baroreflex response to a fall in mean blood pressure. Blood pressure falls, SVR increases, venoconstriction, preload increases, [_______] and [_______]
Pulse pressure
A term used to describe the pressure difference between systolic and diastolic blood pressures
Mean blood pressure and pulse pressure
Baroreceptors respond to both [_______] and [_______]
Secondary organ damage
A term used to describe damage to vital tissues caused not by direct injury, but through ischaemia as a result of the baroreceptor reflex
Carotid sinus massage
A physical technique that can distend the baroreceptors to slow heart rate. Useful in treating supraventricular tachycardia