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Published on: June 2, 2022
Management of vascular calcification in CKD patients
Shaul G Massry1, Miroslaw Smogorzewski
1Division of Nephrology and the Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA. massry@usc.edu
Insights
Vascular calcification in chronic kidney disease (CKD) is linked to high phosphorus levels and inflammation. Managing serum phosphorus below 5.5 mg/dl and treating inflammation are crucial for CKD patient outcomes.
Area of Science:
- Nephrology
- Cardiovascular Medicine
- Biochemistry
Background:
- Vascular calcification is prevalent in chronic kidney disease (CKD) patients, significantly increasing morbidity and mortality.
- Hyperphosphatemia (serum phosphorus > 5.5 mg/dl) is a primary driver of vascular calcification in CKD.
- Inflammation, indicated by elevated C-reactive protein (CRP) and interleukin-6, is also a risk factor for vascular injury.
Purpose of the Study:
- To highlight the critical role of hyperphosphatemia and inflammation in vascular calcification among CKD patients.
- To emphasize the importance of monitoring and managing serum phosphorus and inflammatory markers in CKD management.
Main Methods:
- Review of mechanisms by which hyperphosphatemia induces vascular calcification, including passive calcium-phosphate deposition and active phosphate uptake by smooth muscle cells.
- Analysis of studies correlating C-reactive protein (CRP) levels with vascular calcification in dialysis patients.
Main Results:
- Hyperphosphatemia contributes to vascular calcification through direct salt deposition and by promoting smooth muscle cell transformation into osteoblasts.
- Elevated CRP levels (>1.0 mg/l) are significantly associated with aortic, hand artery, and cardiac valve calcification in dialysis patients.
- Inflammation, evidenced by elevated CRP, is a notable risk factor for vascular calcification in CKD.
Conclusions:
- Maintaining serum phosphorus levels below 5.5 mg/dl is essential for preventing vascular calcification in CKD.
- Aggressive management of inflammation and associated markers like CRP is critical for reducing vascular complications in CKD patients.
- Early detection and intervention for vascular calcification risk factors are vital for improving the prognosis of CKD patients.
Abstract:
Vascular calcification is common in patients with chronic kidney disease (CKD) and it may affect almost every artery. It is associated with a significant increase in morbidity and mortality. Therefore, the detection, prevention and treatment of vascular calcification in CKD patients are critical for the overall approach for the management of these patients. Hyperphosphatemia, especially when the blood levels of serum phosphorus are above 5.5 mg/dl, plays a major role in the development of vascular calcification. Hyperphosphatemia induces vascular calcification by both passive and active processes. By increasing calcium-phosphate product, hyperphosphatemia results in direct deposition of calcium salts in the arteries and in cardiac valves. The active process involves the uptake of phosphate by the smooth muscle cells of the arteries by a Na-P co-transporter. This increase in cell phosphate then induces phenotypic changes of these cells, rendering them into osteoblasts which in turn, begin laying calcium salts in the arterial walls. Therefore, it is critical that the blood levels of serum phosphorus be maintained below 5.5 mg/dl in CKD patients. Inflammation and the production of C-reactive protein (CRP) and interleukin 6 are also risk factors for vascular injury and vascular calcification. In a study of 254 dialysis patients with elevated blood levels of CRP (>1.0 mg/l) and 258 patients with CRP levels equal to or less than 1.0 mg/l, it was found that higher levels of CRP are significantly associated with the presence of both atheromatous and medial calcification of the aorta and hand arteries. Also, it was reported that a significant association between CRP levels and cardiac valves calcification in patients undergoing continuous ambulatory peritoneal dialysis. The reasons for the elevation in CRP in dialysis patients are not clear, but certainly, is more evident in those with obvious inflammatory processes. Therefore, any inflammation that is detected should be treated appropriately.
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