title: Arterial wave reflections and mortality in haemodialysis patients--only relevant in elderly, cardiovascularly compromised?
abstract: BACKGROUND
  Chronic kidney disease (CKD) patients have a 3-30-fold increased risk of death compared with the general population. This mortality difference is even more pronounced in younger subjects. Two markers of aortic stiffness--aortic pulse wave velocity (PWV) and augmentation index (AIx)--have been prospectively related to all-cause and cardiovascular (CV) mortality in end-stage renal disease (ESRD) populations. The aims of our study were first, to confirm the important deleterious effect of arterial stiffness in uraemia and second, to assess the impact on survival of increased AIx in a relatively young non-diabetic dialysis population, with minimal CV disease.
  
  
  METHODS
  Ninety-two patients (mean age 42.6 +/- 11.2 years) were included in the study and followed for a period of 61 +/- 25 months. None of the patients had diabetes mellitus, and only 3.3% had prior history of CV disease. AIx was determined by applantation tonometry using a SphygmoCor device (AtCor, PWV Inc., Westmead, Sydney, Australia).
  
  
  RESULTS
  Mean AIx in our study population was 19.9 +/- 13.7%; other significant haemodynamic parameters were: systolic blood pressure (SBP) 129 +/- 24 mmHg, pulse pressure 35.3 +/- 17.5 mmHg with 27.2% of the study population receiving angiotensin-converting enzyme inhibitors (ACE-I). On univariate analysis, in our group AIx correlated with: body weight (P < 0.001), radial SBP (P < 0.001) and haemoglobin levels (P < 0.05). There was no correlation between AIx and any of the echocardiographic parameters. In the stepwise multiple regression analysis, the only independent predictors for AIx were weight (P < 0.001), SBP (P < 0.001) and haemoglobin (P < 0.05) with the model explaining 33% of the AIx variability (adjusted R(2) = 0.33). During the follow-up period, 15 deaths were recorded. In the Cox analysis (P = 0.014; chi square 20.7 for the model) the only independent predictors for all-cause mortality were age (P = 0.001), left ventricular mass index (P = 0.032) and ACE-I therapy (P = 0.039) while AIx did not reach statistical significance. There was no difference in patients' survival when divided by AIx tertiles, assessed by the log rank test (P = 0.78).
  
  
  CONCLUSIONS
  Our results fail to support the notion that an increased effect of wave reflections on central arteries is a strong and independent predictor of mortality in all ESRD patients on haemodialysis. The effect of arterial wave reflections might be in fact dependent on patient age and concurrent comorbidity status.
authors.affiliation: Dialysis and Transplantation Center, C. I. PARHON University Hospital, 50 Carol 1st Blvd., Iasi, 700503 Romania. acovic@xnet.ro
authors.forename: Adrian
authors.initials: A
authors.lastname: Covic
authors.forename: Nicoleta
authors.initials: N
authors.lastname: Mardare
authors.forename: Paul
authors.initials: P
authors.lastname: Gusbeth-Tatomir
authors.forename: Octavian
authors.initials: O
authors.lastname: Prisada
authors.forename: Radu
authors.initials: R
authors.lastname: Sascau
authors.forename: David J A
authors.initials: DJ
authors.lastname: Goldsmith
mesh_terms: D000328:Adult; D000367:Age Factors; D001011:Aorta / Q000473:pathology / Q000503:physiopathology*; D001783:Blood Flow Velocity; D001794:Blood Pressure; D002318:Cardiovascular Diseases / Q000097:blood / Q000503:physiopathology; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006454:Hemoglobins / Q000378:metabolism; D006801:Humans; D053208:Kaplan-Meier Estimate; D007676:Kidney Failure, Chronic / Q000401:mortality / Q000503:physiopathology* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011673:Pulsatile Flow; D012044:Regression Analysis; D006435:Renal Dialysis; D012307:Risk Factors; D012720:Severity of Illness Index; D015996:Survival Rate; D014511:Uremia / Q000097:blood / Q000503:physiopathology
chemical_list: D006454:Hemoglobins