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Blood pressure and left ventricular hypertrophy in patients on different peritoneal dialysis regimens
Insights
Ambulatory nighttime systolic blood pressure load over 30% is independently associated with left ventricular hypertrophy in peritoneal dialysis patients. Office and home blood pressure readings correlate with 24-hour ambulatory monitoring, with CCPD patients showing higher LVMI.
Area of Science:
- Nephrology
- Cardiology
- Hypertension Research
Background:
- Left ventricular hypertrophy (LVH) is a significant complication in patients undergoing peritoneal dialysis (PD).
- Understanding the determinants of LVH is crucial for managing cardiovascular risk in this population.
Purpose of the Study:
- To investigate the relationship between ambulatory 24-hour blood pressure monitoring (ABPM) results and left ventricular mass index (LVMI) in PD patients.
- To identify independent predictors of LVH in PD patients.
- To compare clinical and cardiovascular characteristics between continuous ambulatory PD (CAPD) and continuous cyclic PD (CCPD) patients.
Main Methods:
- An open, nonrandomized, cross-sectional study was conducted in a medical center.
- Thirty-two PD patients (22 CAPD, 10 CCPD) without prior heart disease or long-term hemodialysis were included.
- Measurements included office BP, home BP, ABPM, and echocardiography for LVMI calculation.
Main Results:
- LVMI correlated positively with hypertension duration, nighttime BP load (>30%), serum phosphate, calcium-phosphate product, and ultrafiltration volume.
- Nighttime systolic BP load >30% was the sole independent predictor of LVH.
- CCPD patients exhibited higher LVMI and nighttime ultrafiltration volumes compared to CAPD patients.
Conclusions:
- Ambulatory nighttime systolic BP load >30% is independently associated with LVH in PD patients.
- Office and home BP measurements correlate with ABPM findings in PD patients.
- Higher LVMI in CCPD patients may stem from daytime volume overload.
Objective:
To examine the relation between the results of ambulatory 24-hour blood pressure monitoring (ABPM) and left ventricular mass index (LVMI), then to find the independent determinant for left ventricular hypertrophy (LVH) in peritoneal dialysis (PD) patients. Finally, to evaluate the differences in the clinical and cardiovascular characteristics between patients on continuous ambulatory PD (CAPD) and continuous cyclic PD (CCPD).
Design:
An open, nonrandomized, cross-sectional study.
Setting:
Divisions of nephrology and cardiology in a medical center.
Patients:
Thirty-two uremic patients on maintenance PD therapy (22 patients on CAPD, and 10 on CCPD) without anatomical heart disease or history of receiving long-term hemodialysis.
Interventions:
Home blood pressure (BP) and office BP were measured using the Korotkoff sound technique by sphygmomanometer. ABPM was employed for continuous measurement of BP. Echocardiography was performed for measurement of cardiac parameters and calculation of LVMI.
Main Outcome Measures:
Multivariate logistic regression analysis was performed for independent determinant of LVH in PD patients. The differences in clinical and cardiovascular characteristics between CAPD and CCPD patients were compared.
Results:
Simple regression analysis showed positive correlations between LVMI and the duration of hypertension, ambulatory nighttime BP/BP load/BP load > 30%, serum phosphate, calcium-phosphate product, ultrafiltration (UF) volume, and percentage of UF volume during the nighttime. A negative correlation was noted between LVMI and dipping. In multiple regression analysis, the duration of hypertension was the only variable linked to LVMI. In multivariate logistic regression analysis, only ambulatory nighttime systolic BP load > 30% had an independent association with LVH. There were correlations between office/home BP and ambulatory 24-hour BP. In addition, CCPD patients had higher LVMI, UF volume during the nighttime, and percentage of UF volume during the nighttime than those of CAPD patients.
Conclusions:
In this study, ambulatory nighttime systolic BP load > 30% had an independent association with LVH. Office and home BP measurements were correlated with ABPM in PD patients. The result that CCPD patients had a higher LVMI than CAPD patients may be due to a relative volume overload during the daytime in CCPD patients.