Hypertension - Aetiology, pathophysiology, treatment Flashcards
Hypertension meaning
constantly elevated BP
Left ventricular hypertrophy
enlargement/thickening of the walls in the left ventricle (the main pumping chamber)
Coronary heart disease
plaque in coronary arteries
Farmingham study
risk factors
increase BP leads to increased stroke and CVD likelihood
Sympathetic NS activation produces
vasoconstriction
reflex tachycardia
increased cardiac output
Sympathetic NS activation decreases or increases BP?
increases
The renin-aldosterone-angiotensin system is responsible for long term BP control. Its controls
maintenance of sodium balance
control of Blood volume
control of blood pressure
RAAS is simulated by a fall in
BP
Blood volume
sodium levels
Angiotensin I is converted to angiotensin II by
angiotensin converting enzyme (ACE)
Angiotensin II is released in response to
low blood volume
what does angiotensin II do?
arteriolar constriction
so less blood flow and an increased TPR
hypertrophy
increase in size/volume of organ
Angiotensin II is also a potent
hypertrophic agent and vasoconstrictor
ATRIAL natriuretic peptide
arteriolar dilation
Drug treatment of hypertension
ACE inhibitor
calcium channel blocker
thiazide (type diuretic)