Arterial Wave Reflections and Survival in End-Stage Renal Failure

TLDR

In end‑stage renal failure, heightened arterial wave reflections in central arteries such as the common carotid promote myocardial hypertrophy, increase oxygen demand, and disturb coronary flow distribution. The study aimed to determine whether these wave‑reflection effects predict mortality outcomes in ESRF patients. Eighty‑eight? (actually 180) ESRF patients (mean age 54 ± 16 yr) were followed for 52 ± 36 months, with baseline aortic pulse‑wave velocity and carotid augmentation index measured by applanation tonometry alongside standard clinical and biochemical assessments.

Abstract

The increased effect of arterial wave reflections on central arteries like the common carotid artery seen in end-stage renal failure (ESRF) patients favors myocardial hypertrophy and oxygen consumption and alters coronary blood flow distribution. Nevertheless, the impact of wave reflection on the outcome and end points such as mortality remains to be demonstrated. One hundred eighty ESRF patients (age, 54±16 years) were monitored for 52±36 months (mean±SD). Seventy deaths, including 40 cardiovascular (CV) and 30 non-CV events, occurred. At entry, patients, in addition to standard clinical and biochemical analyses, underwent aortic pulse wave velocity measurement and determination of arterial wave reflexion by applanation tonometry on the common carotid artery that was expressed as augmentation index. Cox analyses demonstrated that predictors of all-cause and CV mortality were age, aortic pulse wave velocity, low diastolic blood pressure, preexisting CV disease, and increased augmentation index, whereas the prescription of an ACE inhibitor had a favorable effect on survival. After adjustment for all confounding factors, the risk ratio for each 10% increase in augmentation index was 1.51 (95% confidence interval, 1.23 to 1.86; P <0.0001) for all-cause mortality and 1.48 (95% confidence interval, 1.16 to 1.90; P <0.0001) for CV mortality. These results provide the first direct evidence that in ESRF patients increased effect of arterial wave reflections is an independent predictor of all-cause and CV mortality.