The burden of subclinical cardiovascular disease in children and young adults with CKD and on dialysis
Abstract Introduction Cardiovascular disease (CVD) is a common cause of morbidity and mortality even in young people with chronic kidney disease (CKD). We examined structural and functional cardiovascular changes in patients with CKD stages 4-5 and on dialysis under 30 years of age. Methods 79 children and 21 young adults underwent cardiac CT for coronary artery calcification (CAC), ultrasound for carotid intima media thickness (cIMT), carotid-femoral pulse wave velocity (cfPWV), and echocardiography. Differences in structural [CAC, cIMT z-score, left ventricular mass index] and functional [carotid distensibility z-score, cfPWV z-score] measures were examined between CKD stages 4-5 and dialysis patients. Results Overall the cIMT z-score was raised (median 2.17, IQR 1.14-2.86) and 10 (10%) had CAC. 16/23(69.5%) of CKD4-5 and 68/77(88.3%) on dialysis had at least one structural or functional CV abnormality. There was no difference in the prevalence of structural abnormalities in CKD or dialysis cohorts, but functional abnormalities were more prevalent in patients on dialysis (p < 0.05). The presence of > 1 structural abnormality was associated with a 4.5-fold increased odds of > 1 functional abnormality (95% CI 1.3 to 16.6, p < 0.05). Patients with structural and functional abnormalities (cIMT z-score >2SD or distensibility <-2SD) had less carotid dilatation (lumen/wall cross sectional areas ratio) compared to those with normal cIMT and distensibility. Conclusion There is a high burden of subclinical cardiovascular disease in young CKD patients, with a greater prevalence of functional abnormalities in dialysis compared to CKD patients. Longitudinal studies are required to test these hypothesis generating data and define the trajectory of CV changes in CKD.