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Co-relation Between Calcium-Phosphorus Product and Hypertension in End-Stage Renal Disease Patients
Faiza Anser1, Murtaza Dhrolia1, Kiran Nasir1
1Nephrology, The Kidney Centre Hospital, Karachi, PAK.
Insights
The calcium-phosphorus product and high phosphorus levels are linked to blood pressure changes in hemodialysis patients. This association was observed for systolic, diastolic, and mean arterial pressure, but not pulse pressure.
Area of Science:
- Nephrology
- Cardiovascular Medicine
- Clinical Chemistry
Background:
- Maintaining mineral and bone disorder balance is crucial in hemodialysis (HD) patients.
- The calcium-phosphorus (Ca-P) product is a key indicator of mineral metabolism.
- Elevated Ca-P product is associated with cardiovascular complications in chronic kidney disease.
Purpose of the Study:
- To investigate the relationship between the Ca-P product and pre- and post-dialysis blood pressure (BP) parameters in HD patients.
- To determine the independent effect of serum calcium, phosphorus, and parathyroid hormone on BP.
- To identify potential markers for BP management in HD populations.
Main Methods:
- Prospective, observational, cross-sectional study.
- 111 patients undergoing maintenance HD for over six months were enrolled.
- Linear regression analysis was used to assess correlations between Ca-P product and BP parameters (SBP, DBP, MAP, pulse pressure).
Main Results:
- The Ca-P product showed strong correlations with pre-dialysis diastolic BP (0.7) and post-dialysis mean arterial pressure (0.7).
- Moderate correlations were found with systolic BP and mean arterial pressure, both pre- and post-dialysis.
- Serum phosphorus levels, independently, significantly correlated with systolic BP, diastolic BP, and mean arterial pressure.
Conclusions:
- A significant association exists between the Ca-P product and pre- and post-dialysis blood pressure (SBP, DBP, MAP) in hemodialysis patients.
- Elevated serum phosphorus levels independently impact blood pressure parameters in this cohort.
- The Ca-P product and serum phosphorus are not associated with pulse pressure variations.
Abstract:
Objective In our study, we evaluated the relation between calcium-phosphorus (Ca-P) product and various measurements of pre and post-dialysis blood pressure (BP) in hemodialysis (HD) patients. Methods This is a prospective, observational, cross-sectional study in which patients undergoing maintenance HD for > six months were enrolled through non-probability consecutive sampling during a six-month period from October 2020 to March 2021. Linear regression analysis was done to study the effect of the Ca-P product for each parameter of BP and regression coefficients were acquired. Results There was a total of 111 patients in our study, of which 59 (53.2%) were male. The mean age was 50.1± 14.4. The most common comorbid was hypertension (98.2%). The mean HD vintage of patients was 5.7 ± 5.8 years. On linear regression analysis, the Ca-P product was strongly correlated with pre-HD diastolic BP (DBP) (0.7) and post-HD mean arterial pressure (MAP) (0.7) while a moderate correlation was present with pre (0.59) and post (0.64) HD systolic BP (SBP), post-HD diastolic BP (0.68), and pre-HD MAP (0.68). On the other hand, the Ca-P product was not correlated with pre and post-HD pulse pressure (0.06 and 0.1, respectively). When the independent effect of serum calcium (Ca), phosphorus (P), and parathyroid hormone on BP was studied, P had a significant correlation with pre and post-HD SBP, DBP, and MAP. Conclusion Our study demonstrates a significant association of the Ca-P product and an independent high P level with pre and post-dialysis SBP, DBP, and MAP while no association was found with pulse pressure.
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