A review of olmesartan medoxomil monotherapy: antihypertensive efficacy similar to that of other angiotensin II receptor blocker/hydrochlorothiazide combinations?

ARB-Based Combination Therapy for the Clinical Management of Hypertension and Hypertension-Related Comorbidities: A Spotlight on Their Use in COVID-19 Patients

Essential hypertension is the most common cardiovascular (CV) risk factor, being primarily involved in the pathogenesis of CV disease and mortality worldwide. Given the high prevalence and growing incidence of this clinical condition in the general population in both high and low-income countries, antihypertensive drug therapies are frequently prescribed in different hypertension-related CV diseases and comorbidities. Among these conditions, evidence are available demonstrating the clinical benefits of lowering blood pressure (BP) levels, particularly in those hypertensive patients at high or very high CV risk profile. Preliminary studies, performed during the Sars-COVID-19 epidemic, raised some concerns on the potential implication of hypertension and antihypertensive medications in the susceptibility of having severe pneumonia, particularly with regard to the use of drugs inhibiting the renin-angiotensin system (RAS), including angiotensin converting enzyme (ACE) inhibitors and angiotensin receptor blockers (ARBs). These hypotheses were not confirmed by subsequent studies, which independently and systematically demonstrated no clinical harm of these drugs also in patients with Sars-COVID-19 infection. The aim of this narrative review is to critically discuss the available evidence supporting the use of antihypertensive therapies based RAS blocking agents in hypertensive patients with different CV risk profile and with additional clinical conditions or comorbidities, including Sars-COVID-19 infection, with a particular focus on single-pill combination therapies based on olmesartan medoxomil.

Pharmacokinetic and pharmacodynamic interaction between irbesartan and hydrochlorothiazide in renal hypertensive dogs

Combined irbesartan/hydrochlorothiazide (HCTZ) formulations are often used clinically. Pharmacokinetic-pharmacodynamic (PK/PD) modeling was applied to investigate the pharmacokinetic and pharmacodynamic interaction between irbesartan and HCTZ in renal hypertensive dogs at non-steady-state and steady-state. The renal hypertensive dogs were treated with oral irbesartan alone, or HCTZ alone, or the combination of irbesartan and HCTZ for 8 days. Blood pressure and plasma concentrations were measured and pharmacokinetic-pharmacodynamic parameters were analyzed. Irbesartan showed a two-compartment model pharmacokinetic profile. The concentration-time course of irbesartan was not changed by HCTZ, but irbesartan increased the peak plasma concentration and area under the curve of HCTZ at steady-state. HCTZ had no blood pressure lowering effect at non-steady-state. Irbesartan plus HCTZ had greater blood pressure lowering action than irbesartan alone. HCTZ increased actions of irbesartan. Hysteresis loops were found between effect and plasma concentrations of irbesartan after a single dose. However, hysteresis loops disappeared at steady state with more rapid realization of maximum concentration and effects. The relationship between effects and effect-compartment concentrations of the drugs was represented by a sigmoid Emax model. The results suggest synergistic pharmacodynamic interaction between irbesartan and HCTZ in renal hypertensive dogs and some differences of pharmacokinetic-pharmacodynamic properties between irbesartan and irbesartan/HCTZ combinations at non-steady-state and steady state.

Patterns of antihypertensive therapy in new users of angiotensin II-receptor blockers

PURPOSE

The patterns of angiotensin II-receptor blocker (ARB) therapy in patients with and without a history of antihypertensive use were studied.

METHODS

Data for this retrospective cohort study were obtained from Caremark's data warehouse. Patients were included in the analysis if they filled prescriptions for ARBs only, did not receive ARB therapy within the 6 months before the filling of the first ARB prescription (index date), were continuously eligible for benefits for 6 months before the index date, were eligible for prescription benefits for the 12 months following the index date, and were age 20-80 years.

RESULTS

Of the 174,573 patients sampled, 53.4% were new to all antihypertensive therapies. Of the patients receiving an ARB, 67.9% received another antihypertensive during the evaluation period. Over 40% of patients new to all antihypertensive therapies had no other antihypertensive added to their ARB regimen. Of the patients with a history of antihypertensive use, 22.3% discontinued all antihypertensives before starting therapy with an ARB. Patients starting therapy with losartan and valsartan were less likely to be treated with mono-therapy and more likely to be treated with ARB-diuretic therapy than were patients starting therapy with telmisartan, irbesartan, or candesartan.

CONCLUSION

Patients who started antihypertensive therapy with ARBs tended to be new to antihypertensive therapy and, in a plurality of cases, continued to receive therapy with ARBs only. More than a fifth of patients who received antihypertensive therapy in the recent past were switched from that therapy to treatment with ARBs only. Treatment patterns differed by initial ARB used and the demographic profile of the patient.

Telemonitoring of blood pressure self measurement in the OLMETEL study

OBJECTIVE

To investigate the feasibility of blood pressure (BP) telemonitoring in previous uncontrolled hypertensives treated with olmesartan medoxomil in a clinical practice setting.

METHODS

Patients (n = 53) with untreated, uncontrolled or insufficiently treated hypertension were selected by physicians to receive olmesartan medoxomil 10-40 mg/day for 12 weeks. Office BP values were determined by a physician at baseline and after 12 weeks' treatment; BP self-measurement (BPSM) was conducted throughout the 12-week treatment period using a TensioPhone TP2 telemonitoring device; BP values were stored and automatically downloaded to a remote service centre via standard telephone lines.

RESULTS

Olmesartan medoxomil produced statistically significant reductions from baseline in both systolic and diastolic office BP and BPSM values. In contrast to office BP, telemonitoring of BPSM allowed the early identification of responders (e.g., after 2-3 weeks' treatment). Blood pressure reduction with olmesartan medoxomil was greater for office BP than for BPSM values. Normalization of BP was achieved in 64.2% of the patients using office BP measurement compared with 36.4% using BPSM. Blood pressure self-measurement showed no significant difference between morning and evening BP measurements or between the morning : evening BP ratio at baseline and after nine weeks of olmesartan medoxomil treatment. Compliance and tolerability were good or very good in most patients.

CONCLUSION

In a 'real-life' clinical practice setting, telemonitoring of BPSM was an effective technique that was partially affected by patient non-compliance. Olmesartan medoxomil provided effective and reliable BP-lowering, which was maintained throughout the 24-hour period.

Pharmacokinetic and pharmacodynamic of irbesartan in renal hypertensive dogs under non-steady-state and steady-state conditions

The aim of this study was to investigate the pharmacokinetic and pharmacodynamic properties of irbesartan in renal hypertensive dogs under non-steady-state and steady-state conditions using pharmacokinetic-pharmacodynamic (PK/PD) modeling. Drugs were administered intragastrically to renal hypertensive dogs, plasma drug concentration was determined by HPLC method and Pharmacologic effects, including SBP, DBP, dp/dtmax and LVSP, were measured simultaneously. AT II, Aldosterone (ALD) and Endothelin (ET) were also used as measurement of effect. The PK and PD data were quantitatively analyzed according to the PK/PD model theory. The pharmacokinetic profiles of irbesartan conformed to a two-compartment open model. There was hysteresis loops between effects and plasma concentrations under non-steady-state condition. The relationship between effects and effect compartment concentrations (Ce) could be represented by the Sigmoid-Emax model. The Hysteresis loops disappeared under steady-state condition with more rapidly attainment of maximum concentration and effect. There were certain difference of pharmacokinetic and pharmacodynamic properties between non-steady-state and steady-state condition.