Non-dipping circadian blood pressure and renal impairment are associated with increased mortality in diabetes mellitus

Diabet Med. 2000 May;17(5):360-4. doi: 10.1046/j.1464-5491.2000.00284.x.


Aims: To assess the relevance of circadian blood pressure variation to future morbidity and mortality in patients with diabetes mellitus.

Methods: A retrospective descriptive 4 year follow-up study of data collected after ambulatory blood pressure monitoring in a clinic setting.

Results: Seventy-five patients (46 male; 29 female) of whom 41 % had Type 1 diabetes and 59% Type 2 were followed up for a median of 42 months (11-56). The median creatinine for the whole group at baseline was 101 (56-501) micromol/l. The median circadian blood pressures for the total study population were 147 (110-194)/87 (66-109) mmHg during daytime and 132 (86-190)/77 (50-122) mmHg during night-time. Half of the patients exhibited a fall in night-time pressures to 10% lower than daytime pressures (dippers). Dippers were younger, 47 (32-75) years, than non-dippers, 57 (35-79) years, P = 0.03. Over time, dippers had a lower mortality than non-dippers, with 8% deaths in the cohort of dippers, 26% deaths in the cohort of non-dippers, P = 0.04. Cox regression analysis revealed significant contributions from age, duration of diabetes and baseline renal function to subsequent mortality in non-dippers. Analysing current degree of renal impairment and original dipper status together revealed that, of those patients whose creatinine remained normal, 7% of patients whose blood pressure dipped had subsequently died and 10% of non-dipping patients had died; of those patients whose creatinine unequivocally rose, 10% of dipping patients had died and 42% of non-dipping patients had died, P = 0.03

Conclusions: Loss of circadian variation in blood pressure is associated with an increased mortality rate, regardless of diabetes type. The combination of non-dipping and subsequent renal impairment leads to the highest mortality rate. The study suggests a role for ambulatory blood pressure monitoring in day-to-day clinical practice to select patients with nephropathy who are at greatest risk, in an effort to alter outcome.

MeSH terms

  • Adult
  • Aged
  • Blood Pressure*
  • Cardiovascular Diseases / etiology
  • Cardiovascular Diseases / physiopathology
  • Circadian Rhythm*
  • Diabetes Mellitus, Type 1 / mortality*
  • Diabetes Mellitus, Type 1 / physiopathology
  • Diabetes Mellitus, Type 2 / mortality*
  • Diabetes Mellitus, Type 2 / physiopathology
  • Diabetic Angiopathies / etiology
  • Diabetic Angiopathies / physiopathology
  • Diabetic Nephropathies / physiopathology*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Retrospective Studies
  • Risk Factors