Plasma Calmodulin as a Biomarker of Subclinical Cardiovascular Disease in Pediatric Chronic Kidney Disease

Background: Calmodulin is a calcium-signaling protein implicated in cardiac remodeling and could be released extracellularly. It was previously identified as differentially expressed in hypertensive pediatric chronic kidney disease (CKD). This study assessed plasma calmodulin as a cardiovascular disease (CVD) biomarker in pediatric CKD and compared it with traditional risk markers. Methods: We conducted a cross-sectional study of 81 children with CKD aged 3-18 years. All underwent clinical assessments and echocardiography; 44 had carotid ultrasound, and 38 completed ambulatory blood pressure monitoring (ABPM). Results: Most participants had preserved renal function (median eGFR, 104.4 mL/min/1.73 m(2)). Plasma calmodulin levels were significantly associated with early markers of CVD, including interventricular septal thickness, left ventricular mass, carotid intima-media thickness, and ABPM systolic measures (all r > 0.2; p < 0.05). In multivariable analysis, only calmodulin and office systolic blood pressure (BP) independently predicted abnormal BP profiles. Conclusions: Plasma calmodulin may serve as a sensitive, though non-specific, early CVD biomarker in pediatric CKD and could complement conventional screening tools.