From JNC I to JNC 7—What Have We Learned?

The debate over the optimal blood pressure treatment target of less than 130/80 mmHg

OBJECTIVES

The objective of this study was to analyze the controversy regarding the optimal blood pressure (BP) target of <130/80 mmHg as proposed by the 2017 American College of Cardiology/American Heart Association (ACC/AHA) across all age groups. Hypertension is a major risk factor for cardiovascular disease (CVD), stroke, and chronic kidney disease (CKD), and its optimal control is associated with lessening or preventing these complications. A recent study has argued that this BP level is universally accepted as an optimal and safe BP level. However, this argument is not accepted by other investigators, arguing that higher BP levels are as effective and safe.

METHODS

In order to investigate the current status of this level of BP control, a Medline search of the English literature was conducted between 2017 and February 2022, and 25 pertinent papers were selected.

RESULTS

The analysis of data from these studies indicates that these BP are effective in lowering the BP and preventing cardiovascular disease, heart failure, and chronic kidney disease, and they are indeed universally accepted.

CONCLUSION

Based on the current evidence, the current proposed by the 2017 ACC/AHA treatment guidelines are effective in lowering the BP and decreasing its cardiovascular complications and should followed, till perhaps, new data come out to the contrary.

Deprescribing Antihypertensive Medications in Older People: A Narrative Review, Part 1

The problem of polypharmacy is complex, pervasive, and expanding. Appropriate prescribing of antihypertensive therapy for older people might help reduce medication burden, but it begins with a better understanding of what the evidence offers and where the evidence is quiet.In the first of this three-part series on antihypertensive medications for older people, we will trace the history of treating blood pressure with medication, from the expert opinion opposing treatment, to the observational data that led to paradigm shifts. We will follow the trail of evidence to randomized controlled trials (RCT) demonstrating the clear benefit of better control of blood pressure for all adults, regardless of age.RCT first evaluated any treatment against placebo, then began comparing one medication with another, and finally, more intensive control compared with less intensive control. Eventually professional societies bundled the evidence into guidelines to help busy prescribers and pharmacists wisely advise the consumers at the coal-face.In this first part of this series, we will present the evidence that favors intensive therapy in older people, that lower is better. In the second part, we will present evidence that highlights the dangers of going too low, and that stopping blood pressure-lowering medication might help. In the third part, we will discuss the evidence, new and old, that shows what happens when you stop.

Antihypertensive and cardioprotective effects of three generations of beta-adrenergic blockers: an historical perspective

There are currently, 3 generations of beta-adrenergic blockers for the treatment of hypertension and cardiovascular diseases. The 1^st generation caused vasoconstriction and bronchoconstriction due to β₁ + β₂ receptor blockade and unopposed α₁ receptors. The 2^nd generation of beta-blockers has lesser adverse effects than the 1^st generation with the 3^rd generation beta-blockers having much lesser effects than the other two generations. Current US and International guideline do not recommend beta-blockers as first line therapy of hypertension, but only in the presence of coronary artery disease or heart failure due to their lesser antihypertensive effect. These recommendations are disputed by several older and recent studies which have shown that the beta-blockers are effective and safe for the treatment of hypertension and could be used as first line therapy. To clarify this issue a Medline search of the English language literature was conducted between 2012 and 2021 and 30 pertinent papers were selected. The data from these studies show that the beta-blockers have inferior antihypertensive and stroke protective effect compared with the other classes of antihypertensive drugs and should be used as first line therapy only in patients with hypertension associated with coronary artery disease or heart failure. The information from these papers and collateral literature will be discussed in this perspective.

The clinical significance of isolated diastolic hypertension

The prevalence of isolated diastolic hypertension (IDH) has been increased in hypertensive subjects with the new 2017 ACC/AHA blood pressure treatment guidelines to 6.5% from 1.3% by the JNC-7 guidelines. However, its clinical significance as a cause of adverse cardiovascular (CV) events especially in older subjects has been debated by several investigators, who have demonstrated no adverse CV effects of untreated IDH, but not by others. It is also more common in the young subjects who are at low CV risk and quite rare in the older subjects, who are at increased CV risk. Treatment of IDH in the older subjects could increase the CV complications due to a J-curve effect and, in addition, could increase the incidence of stroke from further lowering the normal systolic blood pressure (SBP). Very low SBP and DBP cannot be sustained by the cerebral blood flow autoregulation and could lead to cerebral ischemia. In order to get a better perspective of the current status of the treatment of IDH, a review of the English language literature of the available studies was conducted and 12 papers with pertinent information were retrieved. The analysis of results from these studies suggests that IDH is associated with adverse CV events in younger persons and it should be treated. In contrast, the prevalence of IDH is low in older subjects and is not associated with adverse CV events in the majority of cases. Thus, its further lowering should be avoided to prevent further decrease in normal SBP and prevent the onset of adverse CV events. However, the decision to treat IDH in older subjects should be individualized.

Effectiveness of the fixed-dose combination of olmesartan/amlodipine/hydrochlorothiazide for the treatment of hypertension in patients stratified by age, race and diabetes, CKD and chronic CVD

The prevalence of hypertension is high in patients with diabetes mellitus (DM), chronic kidney disease (CKD) and chronic cardiovascular disease (CVD), as well as in black and elderly subjects. In addition, these subjects have the lowest control of blood pressure (BP) among the hypertensive population, and also the risk of having a morbid or fatal cardiovascular event >20% in 10 years. For these reasons, aggressive control of BP to <130/80 mm Hg for these subjects is strongly recommended by National and International guidelines. To accomplish this goal, combination therapy with two or more antihypertensive drugs with a complementary mechanism of action is necessary. Drugs that block the renin-angiotensin system (RAS) in combination with a calcium channel blocker (CCB) and a diuretic have been shown to be the most effective combinations to accomplish this goal. However, this will require the administration of multiple drugs given separately, which will decrease the patient compliance and adherence to treatment. Poor patient compliance and adherence to treatment is a major factor for poor BP control. Several studies have shown that patient compliance is inversely related to the number of drugs being administered. To overcome this problem, several dual and triple-drug, fixed-dose combinations with a RAS blocker, a CCB and a diuretic have been developed and marketed, which are easier to administer, and have been shown to increase patient compliance and adherence to treatment. In this concise review, the effectiveness and safety of the fixed-dose, triple-combination of the RAS blocker olmesartan medoxomil, the CCB amlodipine besylate and the diuretic hydrochlorothiazide, as well as other similar combinations for the treatment of hypertension, will be discussed. These drug combinations have been shown to be effective, safe and well tolerated by most patients.

The treatment of hypertension: a remarkable success story

One of the most successful public health programs in the past century provides an example of what can be accomplished when the government, the private sector, academia, and community organizations work together. The results of 4 decades of activities of the National High Blood Pressure Education Program (NHBPEP) can be measured in several ways. The publics' awareness, treatment, and control have increased remarkably. Hypertension is the primary reason adults visit physicians. Age-adjusted mortality for heart disease and stroke has declined by 70% and 80%, respectively, since the beginning of the program. The decline in heart and stroke deaths is seen in both sexes and blacks and whites, and is particularly evident in people who reside in the southeastern portion of the United States, which once had the highest mortality rates of stroke in the United States. This dramatic decrease in strokes and heart disease has occurred despite the substantial increase in obesity and diabetes in the United States.

Hypertension: how does management change with aging?

Hypertension is a significant risk factor for cardiovascular morbidity and mortality in people older than 60 years. Isolated systolic hypertension and widened pulse pressure appear to be more important than diastolic hypertension. Very low blood pressure and orthostatic hypotension are associated with increased mortality, and should be checked for at every visit. Best evidence suggests that adjusting hypertension goals with age, and starting therapy when blood pressure is greater than 160/90 leads to improved outcomes. Therapy should start with a thiazide diuretic (best evidence) or an angiotensin-converting enzyme inhibitor.

Long-term blood pressure control: what can we do?

There are unique problems associated with the long-term control of blood pressure (BP) in patients with hypertension. Many of these problems warrant specific discussion for the primary care physician. Up to one-third of high-risk patients are estimated to have uncontrolled hypertension. Although long-term control is essential to avoid complications of cardiovascular disease, such as myocardial infarction, stroke, heart failure, and kidney disease, it can become troublesome because of challenges with patient compliance and adherence to medication regimens. This may be due to low tolerability profiles, complicated regimens, or prohibitive costs. Trials have shown that a combination approach may reduce side effects with complementary therapies such as a calcium channel blocker (CCB)/angiotensin receptor blocker (ARB) combination. Combination therapy can be used in any patient group not responsive to monotherapy, or who remain 20 mm Hg higher than their BP goal. This method may achieve the goal of reaching target BP sooner as a first-line approach and, in a fixed-dose combination, may be a more economic choice as well as a simpler regimen for the patient. Together with supportive measures, CCB/ARB combinations are a compelling alternative for the long-term treatment of hypertension.

Amlodipine besylate/olmesartan medoximil fixed combination for the treatment of hypertension

National and international guidelines recommend the use of combination drugs as a first-line therapy for persons with stage 2 hypertension (blood pressure > or =160/100 mmHg). Although hypertension is common (30% of adults in the USA), its control to recommended blood pressure levels of under 140/90 mmHg remains low, at 36.8%. In the past, fixed-drug combinations included a diuretic with another antihypertensive drug. Recently, combinations of angiotensin-converting enzyme inhibitors or angiotensin receptor blockers mostly with dihydropyridine calcium channel blockers have been developed and approved for the treatment of hypertension. One of these, olmesartan medoxomil in combination with amlodipine besylate has been shown to be effective and safe for the treatment of hypertension. In a large, randomized, placebo-controlled study (Combination of Olmesartan medoxomil and Amlodipine besylate in Controlling High blood pressure [COACH]) of 1940 patients, the high-dose combinations of olmesartan medoxomil and amlodipine besylate 40/10 mg/day reduced the sitting systolic and diastolic blood pressure by 29/19 mmHg from baseline (p < 0.001) and resulted in 54% of patients achieving blood pressure goals. It also decreased the pedal edema induced by amlodipine monotherapy 10 mg/day by 36.1%. This drug combination, besides being effective, is also safe and well tolerated.

Historical perspectives on the management of hypertension

As late as the 1950s, elevated blood pressure was considered by many expert physicians to be necessary for the adequate perfusion of vital organs. Although the morbidity and mortality risks of hypertension were known at that time to insurance companies, which often refused life insurance policies to people with high blood pressure, there was a lag in the recognition of the dangers of hypertension in the medical community. Following the pioneering efforts of researchers who began to treat patients with malignant hypertension, the results of clinical trials and population studies, and the availability of effective antihypertensive agents, hypertension management improved rapidly. This review traces the history of hypertension management from the 1940s, when President Franklin Delano Roosevelt died of a cerebrovascular accident-a result of uncontrolled hypertension-to today, when a large number of patients, even those with less severe hypertension, are being treated successfully, with a resulting dramatic decrease in hypertension-related vascular disease.