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Association of calcium-phosphorus product with blood pressure in dialysis
1Acadiana Renal Physicians 2804 Ambassador Caffery, Lafayette, LA, USA. ashkar@cox.net
Insights
The calcium-phosphorus product is linked to higher blood pressure in hemodialysis patients. This association, particularly with mean arterial pressure, highlights a key factor in dialysis-related hypertension.
Area of Science:
- Nephrology
- Cardiovascular Medicine
- Mineral Metabolism
Background:
- Hypertension is a prevalent complication in patients undergoing hemodialysis.
- Disorders of mineral metabolism, including the calcium-x-phosphorus product, are implicated in vascular calcification and hypertension in this population.
Purpose of the Study:
- To investigate the association between the calcium-x-phosphorus product and blood pressure levels in hemodialysis patients.
Main Methods:
- A cross-sectional study involving 54 hemodialysis patients over a 6-month period.
- Linear and multilinear regression analyses were performed to assess the relationship between the calcium-x-phosphorus product and various blood pressure parameters (systolic, diastolic, mean arterial pressure, pulse pressure) before and after dialysis, adjusting for confounding factors.
Main Results:
- The calcium-x-phosphorus product showed a significant positive association with predialysis systolic blood pressure, predialysis mean arterial pressure, and postdialysis mean arterial pressure.
- No significant relationship was found between the calcium-x-phosphorus product and pulse pressures.
- The association was stronger with diastolic blood pressure than systolic blood pressure.
Conclusions:
- The calcium-x-phosphorus product is significantly associated with mean arterial pressure in hemodialysis patients.
- Further prospective studies are recommended to explore hemodynamic parameters, arterial stiffness, endothelial dysfunction, and calcification measures related to this association.
Abstract:
Hypertension is very common in dialysis patients. Disorders of mineral metabolism have been linked to vascular calcification and hypertension in dialysis. Fifty-four hemodialysis patients were included in a cross-sectional study in a dialysis unit during a 6-month period. Linear regression analysis was done between averages of calcium and phosphorus (ca x ph) product and blood pressures (BPs). Ca x ph was significantly associated with systolic BP predialysis (P=.03, R=0.28), diastolic BP predialysis (P=.001, R=0.44), predialysis mean arterial pressure (MAP) (P=.002, R=0.4), and diastolic BP postdialysis (P=.03, R=0.26). No relationship was found with pulse pressures. Multilinear regression analysis was then done between ca x ph product and BPs adjusting for age, sex, hemoglobin, diabetes, albumin, parathyroid hormone, ultrafiltration volume, and average BP medications per patient. There was a strong positive association with predialysis systolic BP (P=.003, R(2)=0.49), predialysis MAP (P=.001, R(2)=0.51), and postdialysis MAP (P=.02, R(2)=0.65). No associations with pulse pressures were detected. The study findings suggest that ca x ph product is significantly associated with dialysis MAP and not pulse pressure. This is likely secondary to the stronger relationship with diastolic BP than with systolic BP. Prospective studies looking into the associated hemodynamic parameters related to arterial stiffness and endothelial dysfunction along with measures for calcifications would be very beneficial.
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