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)
Over 8- years old the BP threshold is
145/85 mmHg
the normal BP threshold id
135/85mmHg
is a calcium channel clocker is not suitable (eg oedema, heart failure) offer the patient a
thiazide-like diuretic
For treatment of resistant hypertension consider
further diuretic therapy
ACE inhibitors drug
Ramipril
Angiotensin II antagonists drug
Losartan
valsartan
candesartan*
irbesartan
Calcium channel blockers drugs
nifedipine *
Verapamil
Thiazide type diuretics drug
chlortalidone
beta blocker drug
biosoprolol
What to use when treating hypertension in pregnancy?
methyldopa
White coat hypertension
high BP in a clinical setting
(occasional high BP)
therefore need 24 hour monitoring