Nadolol chemical structure
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Corgard

Nadolol (Corgard) is a non-selective beta-blocker used in the treatment of high blood pressure and chest pain. more...

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Chemistry and pharmacokinetics

Nadolol is nonpolar and hydrophobic, with low lipid solubility. Its half-life is 14-24 hours.

Mechanism of action

Nadolol non-selectively blocks beta-1 adrenergic receptors mainly in the heart, inhibiting the effects of the catecholamines epinephrine and norepinephrine and decreasing heart rate and blood pressure. It also blocks beta-2 adrenergic receptors located in bronchiole smooth muscle, causing vasoconstriction. By binding beta-2 receptors in the juxtaglomerular apparatus, nadolol inhibits the production of renin, thereby inhibiting angiotensin II and aldosterone production. Nadolol therefore inhibits the vasoconstriction and water retention due to angiotensin II and aldosterone, respectively.

The drug impairs AV node conduction and decreases sinus rate.

Nadolol may also increase plasma triglycerides and decrease HDL-cholesterol levels.

Indications

Nadolol is indicated for treatment of moderate hypertension and chest pain. In patients with severe hypertension, nadolol can also treat reflex tachycardia due to treatment with vasodilators.

Contraindications

Patients whose heart rate is largely mediated by the sympathetic nervous system (e.g. patients with congestive heart failure or myocardial infarct) should avoid nadolol as it inhibits sympathetic function. Nadolol is also contraindicated in patients with bradycardia (slow heart rate) because of its vasodilatory effects and tendency to cause bradycardia.

Because of its beta-2 activity, nadolol causes pulmonary vasoconstriction and should be avoided in asthma patients in preference of a beta-1 blocker.

As nadolol, like other beta-2 blockers, inhibits the release of insulin in response to hypoglycemia, it slows patients' recovery from acute hypoglycemic episodes and should be avoided in some patients with diabetes mellitus. In patients with insulin-dependent diabetes, a selective beta-1 blocker is preferred over non-selective blockers.

Side effects

  • Bradycardia
  • Fatigue
  • Bronchospasms

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Management of hypertension in older persons
From American Family Physician, 2/1/05 by Lori M. Dickerson

By 2030, the U.S. population of persons who are older than 65 years is expected to double to more than 60 million. (1) Sixty-five percent of 60 years and older have hypertension, but only 27 percent of these persons have adequate blood pressure control. (2) Furthermore, persons who are normotensive at age 55 have a 90 percent lifetime risk for developing hypertension. (3) This and the presence of other cardiovascular risk factors in older persons (i.e., obesity, left ventricular hypertrophy, sedentary lifestyle, hyperlipidemia, and diabetes) make this population at high risk for morbidity and mortality. (4)

Blood Pressure Measurement

Multiple studies have demonstrated that isolated elevated systolic blood pressure is more prevalent in older persons because of increased large-artery stiffness. (5) Recommendations from the Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC 7) state that systolic blood pressure should be the primary target for the diagnosis and care of older persons with hypertension. (6-9) Blood pressure should be based on the average of two or more properly measured readings, in the sitting position, on two or more office visits. (6) Accurate measurement of blood pressure in older persons can be challenging because of cardiovascular changes associated with aging. Age-related decreases in baroreflex response may lead to orthostatic hypotension, so blood pressure should be monitored in the sitting and standing positions. (6)

Measurements may be inaccurate because of pseudohypertension, in which the blood pressure cuff fails to compress a calcified artery. This should be considered in patients with resistant hypertension (i.e., patients with inadequate blood pressure control despite treatment with an appropriate three-drug regimen), especially if these patients have symptoms of orthostatic hypotension. (6)

Resistant hypertension may be caused by "white-coat hypertension," and therefore may be transient. Ambulatory blood pressure monitoring may be useful in documenting white-coat hypertension and verifying hypotensive symptoms in patients receiving anti-hypertensive agents. (6) One study found that ambulatory blood pressure monitoring was a better predictor of cardiovascular risk than conventional measurements in an older population with isolated systolic hypertension. (10)

Blood Pressure Goals

The goal blood pressure recommended by JNC 7 is less than 140/90 mm Hg (less than 130/80 mm Hg in patients with diabetes mellitus or chronic kidney disease), because achieving these values has been associated with a decrease in cardiovascular disease complications. (6) Although most data support the treatment of older patients with stage 2 isolated systolic hypertension (systolic blood pressure higher than 160 mm Hg), JNC 7 recommends treating older patients with stage 1 isolated systolic hypertension (systolic blood pressure 140 to 159 mm Hg) equally aggressively. (6)

Observational studies and secondary analyses of randomized controlled trials (RCTs) have documented a relationship between a low diastolic blood pressure and an increased risk of coronary events and death (J curve). (11) However, in a reanalysis of the Systolic Hypertension in the Elderly Program (SHEP), there was no definitive evidence of an increase in risk from aggressive use of antihypertensive therapy unless the diastolic blood pressure was lowered to less than 60 mm Hg. (11) Targeting treatment at reducing the pulse pressure is not recommended, because clinically relevant changes in this measurement with antihypertensive therapy have not been documented, nor have any RCTs used this as an end point. (6)

Evidence Supporting Treatment of Hypertension

Since 1985, there have been multiple RCTs and meta-analyses published evaluating the treatment of hypertension in patients older than 60 years. In 2000, a meta-analysis of eight trials was published that included 15,693 older patients with isolated systolic hypertension. (12) Patients were treated with conventional therapy (i.e., thiazide diuretic, beta blocker, calcium channel blocker) or placebo for four years. Active treatment was shown to reduce total mortality (number needed to treat [NNT] = 59), cardiovascular mortality (NNT = 79), fatal or nonfatal cardiovascular events (NNT = 26), and fatal or nonfatal stroke (NNT = 48). (12) A Cochrane review found similar results, concluding that treating healthy older persons with hypertension is highly efficacious. (4) More recent trials have evaluated the effects of different antihypertensive regimens (i.e., angiotensin-converting enzyme [ACE] inhibitors, angiotensin-receptor blockers [ARBs], beta blockers, calcium channel blockers alone and in combination) on the treatment of hypertension in older persons (Table 1). (13-17) Although there were subtle differences among treatments, there were no overall differences in total mortality.

Meta-analyses have documented a sustained reduction in stroke in patients older than 80 years, and a greater benefit in reduction of cardiovascular events in patients older than 70 years. (12,18) The Systolic Hypertension in the Elderly: Lacidipine Long-term (SHELL) study documented a similar benefit in treating hypertension in older persons in three age groups (i.e., 60 to 69 years, 70 to 79 years, and 80 years and older). (19) Although dementia is more common in older patients with hypertension, there is a lack of data supporting the use of antihypertensive agents to prevent cognitive decline. (6)

Special Considerations When Treating Hypertension

JNC 7 recommendations for treating hypertension are similar in the general population and older persons. The key points include: (1) treat isolated systolic blood pressure; (2) thiazide diuretics should be first-line treatment; (3) second-line treatment should be based on comorbidities and risk factors (Table 2) (6,21,22); (4) patients with systolic blood pressure higher than 160 mm Hg or diastolic blood pressure higher than 100 mm Hg usually will require two or more agents to reach goal (6); (5) treatment should be initiated with a low dose of the chosen antihypertensive agent, and titrated slowly to minimize side effects such as orthostatic hypotension (6); and (6) weight loss and sodium reduction have been shown to be feasible and effective interventions in older patients with hypertension. (20) Recommended lifestyle modifications are summarized in Table JNC 7 recommends adoption of the Dietary Approaches to Stop Hypertension (DASH) diet, which has been shown to produce blood pressure reductions similar to single-drug therapy (21); (7) to improve adherence with antihypertensive regimens, involve patients in goal setting, and ensure that the patient's cultural beliefs and previous experiences are incorporated in a treatment plan. (6) Simplify the medication regimen, keeping in mind how much it costs.

Specific Agents

THIAZIDE DIURETICS

Several issues should be considered when using thiazide diuretics in older patients (Table 2). Older patients are more prone to thiazide-induced dehydration and orthostatic changes, so physicians should check for orthostatic hypotension and suggest measures for preventing falls. Serum electrolyte levels should be monitored frequently, and hypokalemia should be treated with potassium administration, the addition of a potassiumsparing diuretic like spironolactone (Aldactone), or the use of a combination product such as triamterene/hydrochlo-rothiazide (Dyazide, Maxzide). (22,23) This is important because in the SHEP trial, older patients with potassium levels less than 3.5 mg per dL (0.9 mmol per L) lost the cardiovascular protective benefit from the thiazide. (24) Although poorly studied, their efficacy may be decreased in patients with chronic kidney disease. (6,22) Uric acid and thiazides compete for excretion at the level of the renal tubule, so caution is necessary in patients with a history of gout. (23) Although thiazide diuretics have been reported to affect serum glucose and lipid levels adversely, there is a decreased incidence of metabolic abnormalities and associated clinical outcomes with low-dose therapy. (13,25)

Patients taking digoxin (Lanoxin) and a thiazide diuretic may be at increased risk of digoxin toxicity because of diuretic-induced electrolyte disturbances. (22) Nonsteroidal anti-inflammatory drugs (NSAIDs) may reduce diuretic and antihypertensive effects of thiazides. (6) When adding an ACE inhibitor or ARB to existing diuretic therapy, there is a possibility of first-dose hypotension and the risk of acute renal insufficiency. (22)

BETA BLOCKERS

Beta blockers reduce mortality and morbidity in older patients with hypertension. Additional indications for use of beta blockers in older persons include high risk for coronary disease and prevention of a second myocardial infarction and heart failure (Table 4). (6) Despite the pharmacokinetic and pharmacodynamic differences among various beta blockers, they have similar clinical antihypertensive efficacy. Atenolol (Tenormin), bisoprolol (Zebeta), and metoprolol (Lopressor, Toprol XL) are cardioselective beta blockers with low lipid solubility, and therefore have a preferable side effect profile in older persons. (22)

Beta blockers that are lipophilic (e.g., propranolol [Inderal]) cross the blood-brain barrier, possibly causing more sedation, depression, and sexual dysfunction in older patients. (22) Beta blockers are contraindicated in patients with severe reactive airway disease, especially the nonselective agents (i.e., nadolol [Corgard] and propranolol). (6) Particularly in older patients, beta blockers as a class can cause bradycardia, conduction abnormalities, and development of heart failure if started too aggressively in patients with preexisting left ventricular dysfunction. (6,22,23) Beta blockers should be tapered before discontinuation to minimize the risk of reflex tachycardia. The effects of beta blockers on lipid profiles are transient and of little clinical significance. (25) Beta blockers should be used with caution in combination with other negative chronotropes, such as diltiazem (Cardizem CD, Dilacor XR, Tiazac), verapamil (Isoptin SR, Calan SR), or digoxin. (6,22,23)

ACE INHIBITORS AND ARBS

Pharmacologic inhibition of the renin-angiotensin-aldosterone system can occur by inhibiting the formation of angiotensin II with an ACE inhibitor or by blocking the receptor site with an ARB. ACE inhibitors and ARBs have compelling indications for use in heart failure, diabetes mellitus, and chronic kidney disease (Table 4). (6) ACE inhibitors (i.e., enalapril [Vasotec], lisinopril [Prinivil, Zestril], ramipril [Altace], trandolapril [Mavik]) also have compelling indications for patients after myocardial infarction, patients at high risk for coronary disease, and for recurrent stroke prevention. (6) Studies comparing equipotent doses of ACE inhibitors have shown comparable efficacy and, although debatable, the benefits are believed to be a class effect. (22)

Generally, ACE inhibitors and ARBs are well tolerated, and the incidence of side effects is low (Table 2). Although rare, angioedema can occur at any time during treatment and appears to be more frequent in blacks. (13,22,23) Cough occurs in up to 25 percent of patients and may necessitate discontinuation of therapy. ARBs (i.e., candesartan [Atacand], irbesartan [Avapro], losartan [Cozaar], valsartan [Diovan]) are reasonable alternatives for those with ACE inhibitor-associated cough. Generally, it is recommended to avoid ARBs in patients with a history of ACE inhibitor-related angioedema, although there are case reports of this being done safely. (26)

First-dose hypotension is a concern in dehydrated, decompensated patients with heart failure, and those with bilateral renal artery stenosis. (6,22) While these drugs potentially preserve renal function, patients may experience an elevation in serum creatinine levels after starting an ACE inhibitor if renal insufficiency, dehydration, or heart failure is present. Because these conditions are common in older patients, hypotension and renal function should be monitored closely upon initiation. There is no serum creatinine value beyond which an ACE inhibitor should not be used, but an acute elevation in serum creatinine above 30 percent warrants a temporary discontinuation or lowering of the dose. (6,27) Because ACE inhibitors also may cause hyperkalemia, serum electrolytes and creatinine should be monitored periodically, particularly in patients receiving potassium-sparing diuretics. (6,23) Like thiazides, NSAIDs can blunt the anti-hypertensive activity of ACE inhibitors and ARBs. (6,23)

CALCIUM CHANNEL BLOCKERS

Calcium channel blockers prevent calcium from entering the cells of the arterial vasculature and cause dilation in the coronary arteries and periphery. There are two classes of calcium channel blockers--dihydropyridines and nondihydropyridines--and both are effective treatments for hypertension in older patients. (6) As a group, calcium channel blockers have compelling indications for use in patients at high risk for coronary disease and those with diabetes mellitus (Table 4). (6) Nondihydropyridines (e.g., diltiazem, verapamil) exhibit negative inotropic and chronotropic effects, making them beneficial in atrial fibrillation and supraventricular tachyarrythmias. (22) Dihydropyridines (i.e., amlodipine [Norvasc], felodipine [Plendil]) are safe for use in patients with heart failure, hypertension, or chronic stable angina. (28) Short-acting agents are not recommended in clinical practice. (6)

In comparison with other antihypertensives, systematic reviews generally have found calcium channel blockers to be equivalent or inferior to other antihypertensive agents. (29) In the Antihypertensive and Lipid-Lowering Treatment to Prevent Heart Attack Trial (ALLHAT), amlodipine was found to be inferior to chlorthalidone in preventing heart failure-related events. (13) Calcium channel blockers have been found to be effective in salt-sensitive hypertensive patients, such as blacks and older persons. (6) Interactions with other drugs and food are reported with some calcium channel blockers (Table 2). In particular, grapefruit juice may increase the bioavail-ability of felodipine significantly leading to profound hypotension, and diltiazem can inhibit the metabolism of cyclosporine (Sandimmune) in transplant patients leading to cyclosporine toxicity. (22,23) The dihydropyridines, especially nifedipine (Adalat CC, Procardia XL), can cause orthostatic hypotension, peripheral edema, and gingival hyperplasia. (6) These are particularly problematic in older patients. (30) Verapamil often is a cause of constipation in older persons. (22,23)

MISCELLANEOUS ANTIHYPERTENSIVE AGENTS

Peripheral alpha blockers, centrally acting agents, and vasodilators have limited use in older persons because of significant side effect profiles. Although these agents have been found to reduce blood pressure effectively, they have not been associated with reductions in morbidity and mortality in patients with hypertension.

Central alpha agonists include clonidine (Catapres), guanfacine (Tenex), methyldopa (Aldomet), and reserpine (Serpasil). These agents act centrally and may cause significant sedation, dry mouth, and depression. (6,22) Many patients experience hypotension in addition to sodium and water retention. Abrupt cessation of high doses of these agents (e.g., greater than 1.2 mg daily of clonidine) may cause rebound hypertension, making them a poor choice for patients with the potential for noncompliance. (22) The clonidine patch (Catapres-TTS), although expensive, is a useful alternative to oral anti-hypertensive therapy in older patients who are unable to take medications by mouth. (22) Like central alpha agonists, the vasodilators hydralazine (Apresoline) and minoxidil (Loniten) cause sodium and water retention and reflex tachycardia, so they are not useful as monotherapy. (23)

The authors indicate that they do not have any conflicts of interest. Sources of funding: none reported.

REFERENCES

(1.) Projected population of the United States, by age and sex: 2000 to 2050. Accessed online September 29, 2004, at: http://www.census.gov/ipc/www/usinterimproj/natprojtab02a.pdf.

(2.) Hajjar I, Kotchen TA. Trends in prevalence, awareness, treatment, and control of hypertension in the United States, 1988-2000. JAMA 2003;290:199-206.

(3.) Vasan RS, Beiser A, Seshadri S, Larson MG, Kannel WB, D'Agostino RB, et al. Residual lifetime risk for developing hypertension in middle-aged women and men: The Framingham Heart Study. JAMA 2002;287:1003-10.

(4.) Mulrow C, Lau J, Cornell J, Brand M. Pharmacotherapy for hypertension in the elderly. Cochrane Database Syst Rev 2004;(3):CD000028.

(5.) Franklin SS, Jacobs MJ, Wong ND, L'Italien GJ, Lapuerta P. Predominance of isolated systolic hypertension among middle-aged and elderly US hypertensives: analysis based on National Health and Nutrition Examination Survey (NHANES) III. Hypertension 2001;37:869-74.

(6.) Chobanian AV, Bakris GL, Black HR, Cushman WC, Green LA, Izzo JL Jr, et al. Seventh report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure. Hypertension 2003;42:1206-52.

(7.) Francos GC, Schairer HL Jr. Hypertension. Contemporary challenges in geriatric care. Geriatrics 2003;58:44-9.

(8.) Blacher J, Staessen JA, Girerd X, Gasowski J, Thijs L, Liu L, et al. Pulse pressure not mean pressure determines cardiovascular risk in older hypertensive patients. Arch Intern Med 2000;160:1085-9.

(9.) Lakatta EG. Cardiovascular aging in health. Clin Geriatr Med 2000; 16:419-44.

(10.) Staessen JA, Thijs L, Fagard R, O'Brien ET, Clement D, de Leeuw PW, et al. Predicting cardiovascular risk using conventional vs ambulatory blood pressure in older patients with systolic hypertension. JAMA 1999;282:539-46.

(11.) Somes GW, Pahor M, Shorr RI, Cushman WC, Applegate WB. The role of diastolic blood pressure when treating isolated systolic hypertension. Arch Intern Med 1999;159:2004-9.

(12.) Staessen JA, Gasowski J, Wang JG, Thijs L, Den Hond E, Boissel JP, et al. Risks of untreated and treated isolated systolic hypertension in the elderly: meta-analysis of outcome trials [published erratum appears in Lancet 2001;357:724]. Lancet 2000;355:865-72.

(13.) ALLHAT Officers and Coordinators for the ALLHAT Collaborative Research Group. Major outcomes in high-risk hypertensive patients randomized to angiotensin-converting enzyme inhibitor or calcium channel blocker vs diuretic: the Antihypertensive and Lipid-Lowering Treatment to Prevent Heart Attack Trial (ALLHAT) [published erratum appears in JAMA 2003;289:178]. JAMA 2002;288:2981-97.

(14.) Hansson L, Lindholm LH, Ekbom T, Dahlof B, Lanke J, Schersten B, et al. Randomised trial of old and new antihypertensive drugs in elderly patients: cardiovascular mortality and morbidity the Swedish Trial in Old Patients with Hypertension-2 study. Lancet 1999;354:1751-6.

(15.) Dahlof B, Devereux RB, Kjeldsen SE, Julius S, Beevers G, de Faire U, et al. Cardiovascular morbidity and mortality in the Losartan Intervention For Endpoint reduction in hypertension study (LIFE): a randomised trial against atenolol. Lancet 2002;359:995-1003.

(16.) Pepine CJ, Handberg EM, Cooper-DeHoff RM, Marks RG, Kowey P, Messerli FH, et al. A calcium antagonist vs a non-calcium antagonist hypertension treatment strategy for patients with coronary artery disease. JAMA 2003;290:2805-16.

(17.) Wing LM, Reid CM, Ryan P, Beilin LJ, Brown MA, Jennings GL, et al. A comparison of outcomes with angiotensin-converting-enzyme inhibitors and diuretics for hypertension in the elderly. N Engl J Med 2003;348:583-92.

(18.) Gueyffier F, Bulpitt C, Boissel JP, Schron E, Ekbom T, Fagard R, et al. Antihypertensive drugs in very old people: a subgroup meta-analysis of randomised controlled trials. Lancet 1999;353:793-6.

(19.) Malacco E, Mancia G, Rappelli A, Menotti A, Zuccaro MS, Coppini A. Treatment of isolated systolic hypertension: the SHELL study results. Blood Press 2003;12:160-7.

(20.) Whelton PK, Appel LJ, Espeland MA, Applegate WB, Ettinger WH Jr, Kostis JB, et al. Sodium reduction and weight loss in the treatment of hypertension in older persons: a randomized controlled trial of nonpharmacologic interventions in the elderly (TONE) [published erratum appears in JAMA 1998;279:1954]. JAMA 1998;279:839-46.

(21.) Sacks FM, Svetkey LP, Vollmer WM, Appel JL, Bray GA, Harsha D, et al. Effects on blood pressure of reduced dietary sodium and the Dietary Approaches to Stop Hypertension (DASH) diet. N Engl J Med 2001;344:3-10.

(22.) E-facts. The next dimension in drug information. Facts and Comparisons. Wolters Kluwer Health, Inc. Accessed online September 29, 2004, at: http://www.efactsonline.com/.

(23.) The sixth report of the Joint National Committee on prevention, detection, evaluation and treatment of high blood pressure [published erratum appears in Arch Intern Med 1998;158:573]. Arch Intern Med 1997;157:2413-46.

(24.) Franse LV, Pahor M, Di Bari M, Somes GW, Cushman WC, Applegate WB. Hypokalemia associated with diuretic use in cardiovascular events in the Systolic Hypertension in the Elderly Program. Hypertension 2000;35:1025-30.

(25.) Lakshman MR, Reda DJ, Materson BJ, Cushman WC, Freis ED. Diuretics and beta-blockers do not have adverse effects at 1 year on plasma lipid and lipoprotein profiles in men with hypertension. Arch Intern Med 1999;159:551-8.

(26.) Gavras I, Gavras H. Are patients who develop angioedema with ACE inhibition at risk of the same problem with AT1 receptor blockers? Arch Intern Med 2003;163:240-1.

(27.) Bakris GL, Weir MR. Angiotensin-converting enzyme inhibitor-associated elevations in serum creatinine: is this a cause for concern? Arch Intern Med 2000;160:685-93.

(28.) Packer M, O'Connor CM, Ghali JK, Pressler ML, Carson PE, Belkin RN, et al. Effect of amlodipine on morbidity and mortality in severe chronic heart failure. N Engl J Med 1996;335:1107-14.

(29.) Psaty BM, Lumley T, Furberg CD, Schellenbaum G, Pahor M, Alderman MH, et al. Health outcomes associated with various antihypertensive therapies used as first-line agents: a network meta-analysis. JAMA 2003;289:2534-44.

(30.) Slavachevsky I, Rachmani R, Levi Z, Brosh D, Lidar M, Ravid M. Effect of enalapril and nifedipine on orthostatic hypotension in older hypertensive patients. J Am Geriatr Soc 2000;48:807-10.

LORI M. DICKERSON, PHARM.D., and MARIA V. GIBSON, M.D., PH.D. Medical University of South Carolina, Charleston, South Carolina

LORI M. DICKERSON, PHARM.D., is a board-certified pharmacotherapy specialist and associate professor in the Department of Family Medicine at the Medical University of South Carolina, Charleston. Dr. Dickerson graduated from Dalhousie University in Halifax, Nova Scotia, with a bachelor's degree in pharmacy. She completed a pharmacy doctorate and a clinical pharmacy residency in family medicine at the Medical University of South Carolina.

MARIA V. GIBSON, M.D., PH.D., is assistant professor in the Department of Family Medicine at the Medical University of South Carolina. She completed her medical degree and an obstetrics and gynecology residency and her doctorate degree at Tomsk State Medical Institute, Tomsk, Russia. Dr. Gibson also completed a family practice residency at Duke University Medical Center in Durham, N.C.

Address correspondence to Lori M. Dickerson, Pharm.D., Medical University of South Carolina, 9298 Medical Plaza Dr., N, Charleston, SC 29406 (e-mail: macfarll@musc.edu). Reprints are not available from the authors.

COPYRIGHT 2005 American Academy of Family Physicians
COPYRIGHT 2005 Gale Group

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