Differential effects of age on carotid augmentation index and aortic pulse wave velocity in end-stage renal disease patients.
BACKGROUND
In healthy, normotensive individuals, age-related changes in carotid augmentation index (AI) are more prominent in younger individuals (< 50 years), whereas changes in aortic pulse wave velocity (PWV) are more marked in older individuals (> 50 years). We investigated whether the differential effects of age on AI and PWV also existed in end-stage renal disease (ESRD) patients.


METHODS
Two hundred and fifty-seven patients (50% male; mean age, 53.9 +/- 15.0 years) with ESRD and 260 normal controls (52% male; mean age, 51.4 +/- 17.8 years) received a comprehensive evaluation of cardiovascular structure and function.


RESULTS
The percent differences in PWV between the younger and older subjects were similar in both ESRD patients (+46.2%) and normal controls (+52.5%). The percent differences in PWV between normal controls and ESRD patients were also similar in both younger (+28.2%) and older (+22.9%) subjects. In contrast, the differences in AI between the younger and older subjects were small in ESRD patients (7.3%) but large in normal controls (19.7%). Furthermore, there was a large difference in AI between normal controls and ESRD patients in the younger (+13.3%) subjects, but no difference in the older subjects (+0.8%) (interaction between study groups and age: p < 0.001).


CONCLUSIONS
Markedly differential effects of age on AI and PWV were observed in ESRD patients. PWV increased with age similarly in both ESRD patients and normal controls, whereas AI increased markedly in the younger but only slightly in the older ESRD patients.
Hsu
Pai-Feng
PF
Department of Internal Medicine, National Yang-Ming University Hospital, Taipei, Taiwan, R.O.C.
Yu
Wen-Chung
WC
Lin
I-Feng
IF
Lin
Yao-Ping
YP
Chuang
Shao-Yuan
SY
Cheng
Hao-Min
HM
Chen
Chen-Huan
CH
D000328:Adult; D000367:Age Factors; D000368:Aged; D001011:Aorta / Q000503:physiopathology*; D002339:Carotid Arteries / Q000473:pathology / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000473:pathology / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D017539:Tunica Intima / Q000473:pathology; D017540:Tunica Media / Q000473:pathology