Hypertension

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Hypertension is a multisystem disease whose hallmark is the elevation of blood pressure.

Classification

Classification of blood pressure for adults
Blood pressure classification Initial blood pressure mm Hg Followup recommended
SBP DBP
Normal <120 and <80 Recheck in 2 years
Prehypertension 120-139 or 80-99 Recheck in 1 year
Stage 1 Hypertension 140-159 or 90-99 Confirm within 2 months
Stage 2 Hypertension >160 or >100 "Evaluate or refer to source of care within 1 month. For those with higher pressures (e.g., >180/110 mmHg), evaluate and treat immediately or within 1 week depending on clinical situation and complications."

Diagnosis

A systematic review by the Rational Clinical Examination has reviewed the research on measuring the blood pressure.[1]

If the diastolic pressure is below 110 mm Hg, it should be confirmed on two addition visits as some patients will have a lower blood pressure on repeat measurements.[2] A larger cuff should be used for obese patients.[3]

21% of patients with untreated borderline hypertension (diastolic pressure between 90 and 104 mm Hg) may have normal blood pressures outside of the doctor's office.[4]

Some patients may have their blood pressure rise by as much as 25 mm Hg due to an alarm reaction upon seeing a doctor.[5]

Elderly patients may have pseudohypertension due to inability of the blood pressure cuff to compress stiff arteries.[6] Pseudohypertension may be detected by Osler's maneuver.[6]

Excluding secondary hypertension

Listening for an abdominal bruit, especially if it is both systolic and diastolic, may help detect underlying renal artery stenosis.[7]

Among patients with resistant hypertension (blood pressure >140/90 mm Hg despite a three drug regimen, 20% of patients had serum aldosterone and plasma renin activity ratio of more than 65:16 with a aldosterone concentration above 416 pmol/L. However, only 10% of all patients had primary aldosteronism. Half of these patients have a normal serum potassium.[8]

Treatment

Current clinical practice guidelines are based on The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC 7)[9] and the 2007 guidelines by the European Society of Hypertension (ESH) and of the European Society of Cardiology (ESC).[10] Drugs for hypertension, called antihypertensives as a group, have been reviewed by the Medical Letter.[11]

Several randomized controlled trials have shown that treating hypertension can reduce morbidity or mortality. These trials include:

  • Hypertension Detection and Follow-up Program[12]
  • Treatment of Mild Hypertension Study (TOMHS) [13]
  • Antihypertensive and Lipid Lowering Treatment to Prevent Heart Attack Trial (ALLHAT).[14]
  • Veterans Affairs Cooperative trial[15][16]
  • Losartan Intervention For Endpoint reduction in hypertension study (LIFE)[17]

Treatment goals

Per the JNC7 Guidelines:[9]

  • "Treating "most patients" SBP and DBP to targets that are <140/90 mmHg is associated with a decrease in cardiovascular complications.
  • In patients with hypertension and diabetes or renal disease, the BP goal is <130/80 mmHg.

Non-drug treatment

Initial medication

Clinical practice guidelines have tried to make blanket recommendations for all patients:

  • "Thiazide-type diuretics for most" patients are recommended by the JNC7 clinical practice guidelines.[9]
  • "[[|Adrenergic beta-antagonist|ß-blockers]], especially in combination with a thiazide diuretic, should not be used in patients with the metabolic syndrome or at high risk of incident diabetes" is noted by the European ESH/ESC clinical practice guidelines.[10] The ESH/ESC guidelines cite the LIFE[17] and ASCOT[18] trials. Unlike the ALL HAT study[19], both of these trials were in largely anglo populations, supported by industry, and at the same institution. All patients in the LIFE trial had left ventricular hypertension (LVH). Based on these two trials, a meta-analysis has concluded that beta blockers should not be the first choice treatment.[20]
Efficacy of different drugs. From Department of Veterans Affairs Cooperative Study Group on Antihypertensive Agents.[15]

However, the Veterans Affairs Cooperative trial suggests the initial drug may be better selected based on the patient's age, race, and gender.[15][16] The patient's demographic roughly corresponds with their renin profile, but is more predictive than the renin profile.[16] The molecular basis is being determined.[21]

In the Veterans Affairs Cooperative, among the the high renin demographic (young whites), diuretics had similar efficacy to placebo; whereas in the low renin demographic (older blacks), the ace-inhibitors had similar efficacy to placebo in the Veterans Affairs Cooperative Study Group on Antihypertensive Agents (see figure).[15] Similarly, a meta-analysis has concluded that beta-blockers are a good first choice for younger patients, but not for older patients.[22]

Predicting response to anti-hypertensives based on demographics
Category name demographics Comments Best anti-hypertensive categories
High renin demographic less than 50 years old, anglo salt-sensitive; diuretic responsive diuretics, calcium channel blockers
Low renin demographic more than 50 years old, non-anglo* ace-inhibitors, ß-blockers
* Obesity and female[23] are also associated with low renin.

Several randomized controlled trials have compared initial medications for hypertension.[14][24][25][15]

  • In the Second Australian National Blood Pressure study (ANBP2),[24][[Angiotensin-converting enzyme inhibitor|ace-inhibitors] were better in a population that was 95% white with a body-mass index of 27. This demographic has features of both high (age) and low (race) renin status.
  • In the ALLHAT study,[14] diuretics were better in a population that was 47% white with a body-mass index of 30.

For patients with Stage 2 Hypertension (SBP >160 or DBP>100 mmHg), start with two drugs.[9]

The race and age demographic may partly predict frequency of drug toxicity to different anti-hypertensive medications.[26]

Resistant hypertension

Blood pressure may be difficult to treat, especially in older patients.[27][28] Clinical practice guidelines from the American Heart Association (AHA) address the management of resistant hypertension.[29]

Physiology

Resistant hypertension is characterized by volume expansion and abnormalities of the renin-angiotensin system with high aldosterone and cortisol with low renin levels in the plasma in spite of 85% of patients in the study taking thiazide diuretics.[30] This suggests that high corticotropin may contribute[30], in some cases due to an abnormal cytochrome P-450 3A5 allele that may reduce metabolism of cortisol and corticosterone (a precursor of aldosterone).[31] Resistent hypertension is also associated with insulin resistance.[32]

Evaluation

The AHA defines resistant hypertension as "blood pressure that remains above goal in spite of the concurrent use of 3 antihypertensive agents of different classes."

First, 'pseudoresistance' should be considered:[29]

  • Medication noncompliance
  • Inadequate prescribing by the health care provider[33] may be the most common cause of persistent hypertension.[34][35]
  • White coat hypertension, pseudohypertension and other problems of measurement.[36]

Next, secondary hypertension should be considered:[29]

Treatment

The AHA recommends that one of the three medicines use for hypertension should be a diuretic.[29]

In an unblinded, uncontrolled extension of the ASCOT randomized controlled trial, spironolactone 25-50 mg per day as a fourth medication reduced the blood pressure by 21.9/9.5. This result was not affected by whether one of the first three medications included a diuretic.[38] A second study study, also uncontrolled, corroborated the role of spironolactone.[39] In this study, 54% of patients were African-American, 45% had primary hyperaldosteronism.

Systolic hypertension

For more information, see: Systolic hypertension.


Elderly patients

Treating patients aged 80 years or older for two years who have a systolic pressure over 160 mm hg (the average entry pressure was 173/91 mm Hg) and treating to 150/80 mm Hg may reduce morbidity.[40] In this trial, the average seated blood pressure at the end of the study in the treatment group was 143/78.

Prognosis

References

  1. ↑ Reeves RA (1995). "The rational clinical examination. Does this patient have hypertension? How to measure blood pressure". JAMA 273 (15): 1211–8. PMID 7707630. [e]
  2. ↑ Hartley RM, Velez R, Morris RW, D'Souza MF, Heller RF (1983). "Confirming the diagnosis of mild hypertension". Br Med J (Clin Res Ed) 286 (6361): 287–9. PMID 6402075. [e] PubMed Central
  3. ↑ Nielsen PE, Larsen B, Holstein P, Poulsen HL (1983). "Accuracy of auscultatory blood pressure measurements in hypertensive and obese subjects". Hypertension 5 (1): 122–7. PMID 6848459. [e]
  4. ↑ Pickering TG, James GD, Boddie C, Harshfield GA, Blank S, Laragh JH (1988). "How common is white coat hypertension?". JAMA 259 (2): 225–8. PMID 3336140. [e]
  5. ↑ Mancia G, Parati G, Pomidossi G, Grassi G, Casadei R, Zanchetti A (1987). "Alerting reaction and rise in blood pressure during measurement by physician and nurse". Hypertension 9 (2): 209–15. PMID 3818018. [e]
  6. ↑ 6.0 6.1 Messerli FH, Ventura HO, Amodeo C (1985). "Osler's maneuver and pseudohypertension". N. Engl. J. Med. 312 (24): 1548–51. PMID 4000185. [e]
  7. ↑ Turnbull JM (1995). "The rational clinical examination. Is listening for abdominal bruits useful in the evaluation of hypertension?". JAMA 274 (16): 1299–301. PMID 7563536. [e]
  8. ↑ 8.0 8.1 Douma S, Petidis K, Doumas M, et al (June 2008). "Prevalence of primary hyperaldosteronism in resistant hypertension: a retrospective observational study". Lancet 371 (9628): 1921–6. DOI:10.1016/S0140-6736(08)60834-X. PMID 18539224. Research Blogging.
  9. ↑ 9.0 9.1 9.2 9.3 Chobanian AV, Bakris GL, Black HR, et al (2003). "The Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure: the JNC 7 report". JAMA 289 (19): 2560-72. DOI:10.1001/jama.289.19.2560. PMID 12748199. Research Blogging. http://www.nhlbi.nih.gov/guidelines/hypertension/jnc7full.pdf
  10. ↑ 10.0 10.1 Mancia G, De Backer G, Dominiczak A, et al (June 2007). "2007 Guidelines for the management of arterial hypertension: The Task Force for the Management of Arterial Hypertension of the European Society of Hypertension (ESH) and of the European Society of Cardiology (ESC)". Eur. Heart J. 28 (12): 1462–536. DOI:10.1093/eurheartj/ehm236. PMID 17562668. Research Blogging.
  11. ↑ (June 2005) "Drugs for hypertension". Treat Guidel Med Lett 3 (34): 39–48. PMID 15912125. [e]
  12. ↑ (January 1997) "Five-year findings of the hypertension detection and follow-up program. I. Reduction in mortality of persons with high blood pressure, including mild hypertension. Hypertension Detection and Follow-up Program Cooperative Group. 1979". JAMA : the journal of the American Medical Association 277 (2): 157–66. PMID 8990344. [e]
  13. ↑ Neaton JD, Grimm RH, Prineas RJ, et al (August 1993). "Treatment of Mild Hypertension Study. Final results. Treatment of Mild Hypertension Study Research Group". JAMA : the journal of the American Medical Association 270 (6): 713–24. PMID 8336373. [e]
  14. ↑ 14.0 14.1 14.2 (December 2002) "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)". JAMA : the journal of the American Medical Association 288 (23): 2981–97. PMID 12479763. [e] Cite error: Invalid <ref> tag; name "pmid12479763" defined multiple times with different content
  15. ↑ 15.0 15.1 15.2 15.3 15.4 Materson BJ, Reda DJ (1994). "Correction: single-drug therapy for hypertension in men". N. Engl. J. Med. 330 (23): 1689. PMID 8177286. [e] Cite error: Invalid <ref> tag; name "pmid8177286" defined multiple times with different content
  16. ↑ 16.0 16.1 16.2 Preston RA, Materson BJ, Reda DJ, et al (1998). "Age-race subgroup compared with renin profile as predictors of blood pressure response to antihypertensive therapy. Department of Veterans Affairs Cooperative Study Group on Antihypertensive Agents". JAMA 280 (13): 1168–72. PMID 9777817. [e]
  17. ↑ 17.0 17.1 Dahlöf B, Devereux RB, Kjeldsen SE, et al (March 2002). "Cardiovascular morbidity and mortality in the Losartan Intervention For Endpoint reduction in hypertension study (LIFE): a randomised trial against atenolol". Lancet 359 (9311): 995–1003. DOI:10.1016/S0140-6736(02)08089-3. PMID 11937178. Research Blogging.
  18. ↑ Dahlöf B, Sever PS, Poulter NR, et al (2005). "Prevention of cardiovascular events with an antihypertensive regimen of amlodipine adding perindopril as required versus atenolol adding bendroflumethiazide as required, in the Anglo-Scandinavian Cardiac Outcomes Trial-Blood Pressure Lowering Arm (ASCOT-BPLA): a multicentre randomised controlled trial". Lancet 366 (9489): 895–906. DOI:10.1016/S0140-6736(05)67185-1. PMID 16154016. Research Blogging.
  19. ↑ Appel LJ (December 2002). "The verdict from ALLHAT--thiazide diuretics are the preferred initial therapy for hypertension". JAMA 288 (23): 3039–42. PMID 12479770. [e]
  20. ↑ Lindholm LH, Carlberg B, Samuelsson O (2005). "Should beta blockers remain first choice in the treatment of primary hypertension? A meta-analysis". Lancet 366 (9496): 1545–53. DOI:10.1016/S0140-6736(05)67573-3. PMID 16257341. Research Blogging. ACP Journal Club review
  21. ↑ Materson BJ (2007). "Variability in response to antihypertensive drugs". Am. J. Med. 120 (4 Suppl 1): S10–20. DOI:10.1016/j.amjmed.2007.02.003. PMID 17403377. Research Blogging.
  22. ↑ Khan N, McAlister FA (June 2006). "Re-examining the efficacy of beta-blockers for the treatment of hypertension: a meta-analysis". CMAJ 174 (12): 1737–42. DOI:10.1503/cmaj.060110. PMID 16754904. Research Blogging.
  23. ↑ Cowley AW, Skelton MM, Velasquez MT (1985). "Sex differences in the endocrine predictors of essential hypertension. Vasopressin versus renin". Hypertension 7 (3 Pt 2): I151–60. PMID 3888837. [e]
  24. ↑ 24.0 24.1 Wing LM, Reid CM, Ryan P, et al (2003). "A comparison of outcomes with angiotensin-converting--enzyme inhibitors and diuretics for hypertension in the elderly". N. Engl. J. Med. 348 (7): 583-92. DOI:10.1056/NEJMoa021716. PMID 12584366. Research Blogging.
  25. ↑ Materson BJ, Reda DJ, Cushman WC, et al (1993). "Single-drug therapy for hypertension in men. A comparison of six antihypertensive agents with placebo. The Department of Veterans Affairs Cooperative Study Group on Antihypertensive Agents". N. Engl. J. Med. 328 (13): 914-21. PMID 8446138. [e]
  26. ↑ McDowell SE, Coleman JJ, Ferner RE (2006). "Systematic review and meta-analysis of ethnic differences in risks of adverse reactions to drugs used in cardiovascular medicine". BMJ 332 (7551): 1177–81. DOI:10.1136/bmj.38803.528113.55. PMID 16679330. Research Blogging.
  27. ↑ Moser M, Setaro JF (July 2006). "Clinical practice. Resistant or difficult-to-control hypertension". N. Engl. J. Med. 355 (4): 385–92. DOI:10.1056/NEJMcp041698. PMID 16870917. Research Blogging.
  28. ↑ Setaro JF, Black HR (August 1992). "Refractory hypertension". N. Engl. J. Med. 327 (8): 543–7. PMID 1635569. [e]
  29. ↑ 29.0 29.1 29.2 29.3 Calhoun, D. A., Jones, D., Textor, S., Goff, D. C., Murphy, T. P., Toto, R. D., et al. (2008). Resistant Hypertension: Diagnosis, Evaluation, and Treatment. A Scientific Statement From the American Heart Association Professional Education Committee of the Council for High Blood Pressure Research. Hypertension, HYPERTENSIONAHA.108.189141. DOI:10.1161/HYPERTENSIONAHA.108.189141.
  30. ↑ 30.0 30.1 Gaddam KK, Nishizaka MK, Pratt-Ubunama MN, et al (June 2008). "Characterization of resistant hypertension: association between resistant hypertension, aldosterone, and persistent intravascular volume expansion". Arch. Intern. Med. 168 (11): 1159–64. DOI:10.1001/archinte.168.11.1159. PMID 18541823. Research Blogging.
  31. ↑ Givens RC, Lin YS, Dowling AL, et al (September 2003). "CYP3A5 genotype predicts renal CYP3A activity and blood pressure in healthy adults". J. Appl. Physiol. 95 (3): 1297–300. DOI:10.1152/japplphysiol.00322.2003. PMID 12754175. Research Blogging.
  32. ↑ Ferrannini E, Buzzigoli G, Bonadonna R, et al (August 1987). "Insulin resistance in essential hypertension". N. Engl. J. Med. 317 (6): 350–7. PMID 3299096. [e]
  33. ↑ Bolen SD, Samuels TA, Yeh HC, et al (May 2008). "Failure to intensify antihypertensive treatment by primary care providers: a cohort study in adults with diabetes mellitus and hypertension". J Gen Intern Med 23 (5): 543–50. DOI:10.1007/s11606-008-0507-2. PMID 18219539. Research Blogging.
  34. ↑ Yakovlevitch M, Black HR (September 1991). "Resistant hypertension in a tertiary care clinic". Arch. Intern. Med. 151 (9): 1786–92. PMID 1888244. [e]
  35. ↑ Berlowitz DR, Ash AS, Hickey EC, et al (December 1998). "Inadequate management of blood pressure in a hypertensive population". N. Engl. J. Med. 339 (27): 1957–63. PMID 9869666. [e]
  36. ↑ Mejia AD, Egan BM, Schork NJ, Zweifler AJ (February 1990). "Artefacts in measurement of blood pressure and lack of target organ involvement in the assessment of patients with treatment-resistant hypertension". Ann. Intern. Med. 112 (4): 270–7. PMID 2297205. [e]
  37. ↑ Isaksson H, Danielsson M, Rosenhamer G, Konarski-Svensson JC, Ostergren J (May 1991). "Characteristics of patients resistant to antihypertensive drug therapy". J. Intern. Med. 229 (5): 421–6. PMID 2040868. [e]
  38. ↑ Chapman N, Dobson J, Wilson S, et al (April 2007). "Effect of spironolactone on blood pressure in subjects with resistant hypertension". Hypertension 49 (4): 839–45. DOI:10.1161/01.HYP.0000259805.18468.8c. PMID 17309946. Research Blogging.
  39. ↑ Nishizaka MK, Zaman MA, Calhoun DA (November 2003). "Efficacy of low-dose spironolactone in subjects with resistant hypertension". Am. J. Hypertens. 16 (11 Pt 1): 925–30. DOI:10.1016/S0895-7061(03)01032-X. PMID 14573330. Research Blogging.
  40. ↑ Beckett, N. S., Peters, R., Fletcher, A. E., Staessen, J. A., Liu, L., Dumitrascu, D., et al. (2008). Treatment of Hypertension in Patients 80 Years of Age or Older. N Engl J Med, NEJMoa0801369. DOI:10.1056/NEJMoa0801369

See also

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