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Current Treatments Targeting Raas And Its Effect On The Increase Of Blood Volume During Hf

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CURRENT TREATMENTS TARGETING RAAS
Because the RAAS has such a profound effect on the increase of blood volume during HF, it is an excellent target for many therapeutic agents. Current pharmacological treatments for HF that target the renin-angiotensin-aldosterone system include ACE inhibitors and Angiotensin II receptor blockers (ARBs).
ACE inhibitors such as Captopril block activity of the enzyme ACE and therefore the conversion of angiotensin I to angiotensin II (the most bio active product of the RAAS), thus inhibiting the actions of angiotensin II and leading to decreased aldosterone production, decrease blood volume and reduced hypertension. ACE inhibitors also work to decrease fibroblast activity as a protective measure against remodelling of the left ventricle (19). Side effects of ACE inhibitors include a dry cough due to the inhibition of bradykinin break down, hypotension and hyperkalemia (due to higher levels of potassium reuptake). ACE inhibitors are currently one of the drugs of choice to treat patients with HF.
ARBs such as Lostaran compete with angiotensin II to bind to the AT1 receptors and prevent the systemic effects of increased levels of angiotensin II in HF (23). This acts to prevent the blood pressure increasing effects of the RAAS. These drugs are generally better tolerated than ACE inhibitors and they do not inhibit bradykinin breakdown so patients do not demonstrate the dry cough associated with ACE inhibitors. Side effects of angiotensin II receptor

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