Central pulse pressure in patients with chronic kidney disease and in renal transplant recipients

Area of Science:

• Nephrology
• Cardiology
• Vascular Physiology

Background:

• Patients with chronic kidney disease (CKD) and renal transplant recipients (RTR) exhibit elevated cardiovascular risk.
• The incremental clinical value of central pulse pressure (cPP) measurement compared to brachial pulse pressure (pPP) in these populations remains unclear.

Purpose of the Study:

• To investigate the independent contribution of central pulse pressure (cPP) in assessing cardiovascular risk in patients with chronic kidney disease (CKD) and renal transplant recipients (RTR).
• To determine if cPP provides additional information beyond brachial pulse pressure (pPP) in predicting cardiovascular parameters like aortic pulse wave velocity (PWV) and left ventricular mass index (LVMI).

Main Methods:

• Central pulse pressure (cPP) and brachial pulse pressure (pPP) were measured in 597 patients (364 CKD, 233 RTR).
• Multivariate analyses were performed to identify factors correlating with cPP, including age, gender, heart rate, and estimated glomerular filtration rate (eGFR).
• The predictive value of cPP versus pPP for PWV and LVMI was assessed in a subset of CKD patients.

Main Results:

• Brachial pulse pressure (pPP) alone accounted for 74% of the variability in central pulse pressure (cPP), with a combined model explaining 91%.
• Age, female gender, heart rate, and eGFR were significant correlates of cPP, with associations for age, heart rate, and gender persisting after adjusting for pPP.
• Central pulse pressure (cPP) did not offer additional predictive value over brachial pulse pressure (pPP) for aortic pulse wave velocity (PWV) or left ventricular mass index (LVMI).

Conclusions:

• In patients with chronic kidney disease (CKD) and renal transplant recipients (RTR), brachial pulse pressure (pPP) is a strong determinant of central pulse pressure (cPP).
• Central pulse pressure (cPP) measurement does not appear to provide incremental prognostic information beyond brachial pulse pressure (pPP) for assessing vascular stiffness and cardiac remodeling in these high-risk patient groups.