title: Nocturnal blood pressure fall as predictor of diabetic nephropathy in hypertensive patients with type 2 diabetes.
abstract: BACKGROUND
  Hypertensive patients with reduced blood pressure fall (BPF) at night are at higher risk of cardiovascular events (CVE).
  
  
  METHODS
  We evaluated in hypertensive diabetic patients, if a reduced nocturnal BPF can precedes the development of diabetic nephropathy (DN). We followed 70 patients with normal urinary albumin excretion (UAE) for two years. We performed 24-hours ambulatory BP monitoring in baseline and at the end of the study.
  
  
  RESULTS
  Fourteen (20%) patients (GI) developed DN (N = 11) and/or CVE (n = 4). Compared to the remaining 56 patients (GII) in baseline, GI had similar diurnal systolic (SBP) and diastolic BP (DBP), but higher nocturnal SBP (138 +/- 15 vs 129 +/- 16 mmHg; p < 0.05) and DBP (83 +/- 12 vs 75 +/- 11 mmHg; p < 0,05). Basal nocturnal SBP correlated with occurrence of DN and CVE (R = 0.26; P < 0.05) and with UAE at the end of the study (r = 0.3; p < 0.05). Basal BPF (%) correlated with final UAE (r = -0.31; p < 0.05). In patients who developed DN, reductions occurred in nocturnal systolic BPF (12 +/- 5 vs 3 +/- 6%, p < 0,01) and diastolic BPF (15 +/- 8 vs 4 +/- 10%, p < 0,01) while no changes were observed in diurnal SBP (153 +/- 17 vs 156 +/- 16 mmHg, NS) and DBP (91 +/- 9 vs 90 +/- 7 mmHg, NS). Patients with final UAE < 20 microg/min, had no changes in nocturnal and diurnal BP.
  
  
  CONCLUSIONS
  Our results suggests that elevations in nocturnal BP precedes DN and increases the risk to develop CVE in hypertensive patients with T2DM.
authors: Universidade Federal do Pará, Belém, Brazil. felicio.bel@terra.com.br
authors: João S
authors: JS
authors: Felício
authors: Ana Carolina C B
authors: AC
authors: de Souza
authors: Nárcia
authors: N
authors: Kohlmann
authors: Oswaldo
authors: O
authors: Kohlmann
authors: Arthur B
authors: AB
authors: Ribeiro
authors: Maria T
authors: MT
authors: Zanella
mesh_terms: D000368:Aged; D000419:Albuminuria / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology; D001794:Blood Pressure / Q000502:physiology; D018660:Blood Pressure Monitoring, Ambulatory / Q000706:statistics & numerical data; D002940:Circadian Rhythm / Q000502:physiology; D003924:Diabetes Mellitus, Type 2 / Q000453:epidemiology / Q000503:physiopathology*; D003928:Diabetic Nephropathies / Q000175:diagnosis* / Q000453:epidemiology / Q000503:physiopathology*; D005260:Female; D006801:Humans; D006977:Hypertension, Renal / Q000175:diagnosis* / Q000453:epidemiology / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012307:Risk Factors