Valsartan - an active specific antagonist of angiotensin receptors II. Selectively blocks AT receptor subtype1 which are responsible for the effects of angiotensin II. The consequence of the blockade AT1-receptors is an increase in plasma concentrations of angiotensin II, which can stimulate unlocked AT2-receptors. Valsartan does not have any marked agonistic activity in relation to AT1receptors. The affinity of valsartan for the receptors of the subtype AT1 approximately at 20 000 times higher than to the receptors of the AT subtype2. Valsartan does not enter into interaction and does not block the receptors of other hormones or ion channels, having important in regulating the functions of the cardiovascular system. Probability the occurrence of cough with valsartan is very low, which is associated with from no effect on the angiotensin-converting enzyme (ACE), which is responsible for the degradation of bradykinin. Comparison of valsartan with an inhibitor ACE demonstrates, what the incidence of dry cough is significant (p < 0.05) is lower in patients taking valsartanthan the of patients taking an ACE inhibitor (2.6% vs. 7.9%, respectively). AT group of patients who had previously been treated with an inhibitor ACE developed dry cough, when treated with valsartan, this undesirable reaction is noted in 19,5% cases, and in the treatment with thiazide diuretic - in 19.0% of cases, - while at group of patients treated with an inhibitor ACE, cough is observed in 68,5% cases (p < 0,05).
Use in hypertension in patients older than 18 years
When treatment of valsartan in patients with arterial hypertension, there is a decrease in blood pressure (BP), not accompanied by a change in the heart rate (Heart rate).
After Intra-single dose administration in most patients, the onset of antihypertensive action is observed within 2 hours, and the maximum decrease HELL is reached within 4-6 hours, lasting more than 24 hours. With repeated use of valsartan, the maximum decrease HELL, regardless of the accepted dose, is usually achieved within 2-4 weeks, and is maintained at the achieved level in the course of long-term therapy. In the case of simultaneous application of valsartan with hydrochlorothiazide a significant additional reduction is achieved HELL. Sharp The discontinuation of valsartan is not accompanied by a significant increase Blood pressure or other undesirable reactions. Have patients with arterial hypertension, sugar type 2 diabetes and nephropathy, taking valsartan in a dose of 160-320 mg, noted a significant decrease in proteinuria (36-44%).
Application after acute myocardial infarction in patients older than 18 years
When the use of valsartan for 2 years in patients between 12 hours to 10 days after an acute myocardial infarction (complicated by left ventricular failure and / or left ventricular systolic dysfunction), the overall mortality, cardiovascular mortality rates decrease and the time increases before the first hospitalizations for exacerbation of the course chronic heart failure, repeated myocardial infarction, sudden cardiac arrest, and stroke (without lethal outcome). The safety profile of valsartan in patients with acute infarction the myocardium is similar to that in other conditions.
Chronic heart failure (CHF) in patients older than 18 years
When application of valsartan (in an average daily dose 254 mg) for 2-х years in patients from CHF II (62%), III (36%) and IV (2%) of the functional class according to the classification NYHA from left ventricular ejection fraction (LV) less than 40% and internal diastolic diameter LV more than 2.9 cm / m2, receiving standard therapy, including inhibitors ACE (93%), diuretics (86%), digoxin (67%) and beta-adrenoblockers (36%) there was a significant decrease (by 27.5%) of the risk hospitalization in occasion of an exacerbation of a current CHF.
Patients who do not received inhibitors ACE, significant a decrease in the total mortality (by 33%), cardiovascular mortality and morbidity, related to CHF (time before the onset of the first cardiovascular event), which are estimated by the following indicators: death, sudden death with resuscitation, hospitalization for exacerbation of the course CHF, intravenous introduction of inotropes or vasodilators during 4 or more hours without hospitalization (by 44%). In the group of patients receiving inhibitors ACE (without beta-adrenoblockers), against the background of valsartan treatment is not observed reduction in the overall mortality rate, however,vascular mortality and morbidity associated with CHF on 18,3%.
AT In general, the use of valsartan leads to a decrease in the number of hospital admissions for CHF, slowing the progression of CHF, improving the functional class CHF by classification NYHA, an increase in the left ventricular ejection fraction, as well as a decrease in the signs and symptoms of heart failure and improved quality of life compared with placebo.
Use in patients over 18 years of age with arterial hypertension and impaired glucose tolerance
When use of valsartan and lifestyle changes, a statistically significant reduction in the risk of developing diabetes mellitus the of this category of patients. Valsartan did not influence the incidence of fatal outcomes as a result of cardiovascular events, myocardial infarction and ischemic attacks without fatalities, on hospitalization due to heart failure or unstable angina, arterial revascularization in patients with impaired tolerance to glucose and arterial hypertension, differing in age, sex and race. Have patients receiving valsartan, risk development of microalbuminuria was significantly lower than in patients not receiving this therapy.
Use in children and adolescents aged 6 to 18 years with hypertension
Children and adolescents aged 6 to 18 years valsartan provides dose-dependent, gradual decline HELL. When using valsartan, the maximum reduction AD, regardless of from the accepted dose is usually achieved within 2 weeks, and supported on achieved level during long-term therapy.