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Editorial

Achieving better blood pressure control

Pages 3-4 | Published online: 08 Jul 2009

Primary hypertension is a polygenic condition with variable contribution from environmental factors. Not surprisingly, there are differential responses to both non‐pharmacological and pharmacological antihypertensive treatments within the population of hypertensive patients. In order to achieve maximal risk reduction, blood pressure (BP) should be reduced to below 140/90 mmHg in lower risk hypertensive patients, and even lower (<130/80 mmHg) if additional risk factors such as diabetes or renal disease are present Citation[1]. Despite the availability of multiple classes of antihypertensive agents that lower BP by different mechanisms, the treatment of hypertension remains a difficult task. In terms of BP lowering effects, it is usually not possible to predict which type of agent is the most appropriate for a given patient. Consequently, in most hypertensive patients, target BPs are usually not reached by the use of monotherapies Citation[2,3]. However, a strategy of combining medications acting by different mechanisms makes it possible to achieve considerable gains in terms of antihypertensive efficacy. This is due to the synergistic effects on the cardiovascular system of antihypertensive medications that have distinct mechanisms of action Citation[4].

When combining two or several antihypertensive medications from different classes, it is important to select combinations of drugs that have complementary effects on BP lowering as well as reduction of adverse events Citation[1]. In recent years, use of fixed‐low‐dose combinations of antihypertensive medications as first‐line treatment has increased greatly, since studies have shown that this approach is likely to both increase the chance of controlling the patient's BP and limit the occurrence of dose‐related adverse effects Citation[5,6].

In the present issue of Blood Pressure, Ruilope and co‐workers Citation[7] argue for wider use of fixed‐dose antihypertensive combinations based on both individual patient benefits and, importantly, also on greater public health and societal value. This Drug Therapeutic Supplement also deals with the issue of which drugs to combine. As demonstrated by Tuomilehto et al. Citation[8] and Schumacher and Mancia Citation[9], a fixed‐dose angiotensin II receptor blocker (ARB)‐diuretic combination has greater or comparable antihypertensive efficacy than ARB treatment alone without reduced tolerability. Most combination regimens currently available for clinical use include an inhibitor of the renin–angiotensin system (RAS) and a diuretic, but a fixed‐dosed combination regimen that includes a calcium‐channel blocker and an angiotensin‐converting enzyme (ACE) inhibitor is also widely used and has recently been shown to have outcome advantages over a combination of the same ACE inhibitor and a diuretic in the ACCOMPLISH trial Citation[10]. Ueng et al Citation[11] demonstrate that the dihydropyridine calcium‐channel blocker amlodipine and the ACE inhibitor benazepril, when combined, have complementary effects on BP, with impressive efficacy in rapid attainment of BP targets as well as levels of BP achieved.

Importantly, as pointed out by Ruilope and coworkers Citation[7], combinations of drugs from different antihypertensive classes may have both synergistic or additive antihypertensive properties and the ability to diminish each others' untoward hemodynamic or metabolic effects. Importantly, beneficial fixed‐dose combinations containing optimal doses can be selected as initial therapy, thereby facilitating rapid BP control and minimizing adverse effects in the newly diagnosed hypertensive Citation[6].

Poor control of hypertension remains an issue in most parts of the world. Failure to attain BP goals is related to multiple factors, e.g. insufficient efficacy of available single antihypertensive agents, poor adherence to prescribed medication, and reluctance of many physicians to treat aggressively, including combining antihypertensive medications to reach target BPs Citation[5]. Most guidelines for the management of high BP advocate a strategy of early combination therapy with low doses of two antihypertensive drugs for management of mild/moderate arterial hypertension. Recent evidence suggests that this strategy may be preferred over monotherapy Citation[5]. The superior effectiveness of low‐dose fixed‐dose combination therapy relates to both better antihypertensive efficacy and higher BP response rates, in part due to improved medication adherence, and to greater tolerability due to reduced rates of adverse effects Citation[12]. In addition, fixed‐dose combination therapy often costs less than free combinations of the component drugs. Because of all of these benefits, increased use of low dose fixed combination therapies will likely translate into a further reduction of hypertension‐related cardiovascular/cerebrovascular morbidity and mortality in the population Citation[13].

References

  • 2007 ESH‐ESC Guidelines. Blood Press 2007; 16: 135–232
  • Waeber B., Brunner H. R. Joint National Committee in the US (JNC‐VI); World Health Organization–International Society of Hypertension (WHO‐ISH) The multifactorial nature of hypertension: The greatest challenge for its treatment?. J Hypertens 2001; 19(Suppl)S9–S16
  • Elliott W. J. What factors contribute to the inadequate control of elevated blood pressure?. J Clin Hypertens (Greenwich) 2008; 10(Suppl 1)20–26
  • Waeber B. Fixed low‐dose combination therapy for hypertension. Curr Hypertens Rep 2002; 4: 298–306
  • Ruzicka M., Leenen F. H. Monotherapy versus combination therapy as first line treatment of uncomplicated arterial hypertension. Drugs 2001; 61: 943–954
  • Rosenthal T., Gavras I. Fixed‐drug combinations as first‐line treatment for hypertension. Prog Cardiovasc Dis 2006; 48: 416–425
  • Ruilope L. M., Burnier M., Muszbek N., Brown R. E., Keskinaslan A., Ferber P., et al. Public health value of fixed‐dose combinations in hypertension. Blood Press 2008; 17(Suppl 1)4–13
  • Tuomilehto J., Tykarski A., Baumgart P., Reimund B., le Breton S., Ferber P. Combination therapy with valsartan/hydrochlorothiazide at doses up to 320/25 mg improves blood pressure levels in patients with hypertension inadequately controlled by valsartan 320 mg monotherapy. Blood Press 2008; 17(Suppl 1)14–22
  • Schumacher H., Mancia G. The safety profile of telmisartan as monotherapy or combined with hydrochlorothiazide: A retrospective analysis of 50 studies. Blood Press 2008; 17(Suppl 1)31–39
  • Kjeldsen S. E., Jamerson K. A., Bakris G. L., Pitt B., Bahlöf B., Velazques E. J., , for the ACCOMPLISH Investigators, et al. Predictors of blood pressure response to intensified and fixed combination treatment of hypertension: The ACCOMPLISH Study. Blood Press 2008; 17: 7–17
  • Ueng K‐C., Lin L‐C., Voon W‐C., Lin M‐C., Liu Y‐B., Su H‐M., et al. An eight week, multicenter, randomized, double‐blind study to evaluate the efficacy and tolerability of fixed‐dose amlodipine/benazepril combination with amlodipine as first‐line therapy in Chinese patients with mild to moderate hypertension. Blood Press 2008; 17(Suppl 1)23–30
  • Bangalore S., Kamalakkannan G., Parkar S., Messerli F. H. Fixed‐dose combinations improve medication compliance: A meta‐analysis. Am J Med 2007; 120: 713–719
  • Kjeldsen S. E., Oparil S., Narkiewicz K., Hedner T. A stunning day in hypertension research – Results on ONTARGET, ACCOMPLISH and HYVET. Blood Press 2008; 17: 68–69

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