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Letters

Managing hypertension in patients with renal disease and diabetes

Roland Grad and Stephen Hanley
CMAJ May 30, 2000 162 (11) 1556;
Roland Grad
Department of Family Medicine McGill University Montreal, Que. Division of Clinical Epidemiology Royal Victoria Hospital Montreal, Que.
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Stephen Hanley
Department of Family Medicine McGill University Montreal, Que. Division of Clinical Epidemiology Royal Victoria Hospital Montreal, Que.
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The authors of the 1999 Canadian recommendations for the management of hypertension state that "hypertension in people with diabetes should be treated to obtain target blood pressure lower than 130/80 mm Hg."1 This grade C recommendation is supported by evidence from the HOT2 and UKPDS 383 studies insofar as the diastolic target is concerned. However, we question the systolic target of 130 mm Hg given our review of the evidence from these 2 studies.

In the HOT study, the mean systolic blood pressure achieved by the group randomized to a diastolic target of < 80 mm Hg was 139.7 mm Hg. In the UKPDS 38 study, the mean systolic blood pressure achieved in the group randomized to "tight" blood pressure control was 144 mm Hg. Therefore, the evidence with regard to the systolic target for control of blood pressure in diabetic patients with hypertension points to 140 mm Hg rather than 130 mm Hg less.

The high prevalence of systolic blood pressures in the range of 130 to 140 mm Hg would mandate additional treatment for a large number of people if the Canadian guidelines were to be closely followed. Of note, the British Hypertension Society recommends that clinicians attempt to achieve a target of less than 140 mm Hg systolic blood pressure in hypertensive patients with type II diabeties.4 Is there additional evidence that led the authors to recommend a lower systolic target of 130 mm Hg?

References

  1. 1.↵
    Feldman RD, Campbell N, Larochelle P, Bolli P, Burgess ED, Carruthers SG, et al, for the Task Force for the Development of the 1999 Canadian Recommendations for the Management of Hypertension. 1999 Canadian recommendations for the management of hypertension. CMAJ 1999;161(12 Suppl):S1-22.
  2. 2.↵
    Hansson L, Zanchetti A, Carruthers SG, Dahlof B, Elmfeldt D, Julius S, et al. Effects of intensive blood pressure lowering and low-dose aspirin in patients with hypertension: principal results of the hypertension optimal treatment (HOT) randomized trial. Lancet 1998;351:1755-62.
    OpenUrlCrossRefPubMed
  3. 3.↵
    UK Prospective Diabetes Study Group. Tight blood pressure control and risk of macrovascular and microvascular complications in type 2 diabetes (UKPDS 38). BMJ 1998;7160:703-13.
    OpenUrl
  4. 4.↵
    Ramsay L, Williams B, Johnston G, MacGregor G, Poston L, Potter J, et al. Guidelines for management of hypertension: report of the Third Working Party of the British Hypertension Society. J Hum Hypertens 1999;13:569-92.
    OpenUrlCrossRefPubMed
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CMAJ
Vol. 162, Issue 11
30 May 2000
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Managing hypertension in patients with renal disease and diabetes
Roland Grad, Stephen Hanley
CMAJ May 2000, 162 (11) 1556;

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Roland Grad, Stephen Hanley
CMAJ May 2000, 162 (11) 1556;
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