The relative potential contribution of volume load and vascular mechanisms to hypertension in non-dialysis and...

Area of Science:

• Nephrology
• Cardiovascular Medicine
• Hypertension Research

Background:

• Hypertension is a common and challenging comorbidity in chronic kidney disease (CKD).
• The specific roles of volume overload versus vascular mechanisms in CKD hypertension remain unclear.
• It is unknown if these factors differ between non-dialysis and dialysis patients.

Purpose of the Study:

• To investigate the impact of volume load (stroke volume) and vascular mechanisms (systemic vascular resistance and arterial compliance) on blood pressure in CKD patients.
• To compare these effects in non-dialysis versus dialysis CKD populations.

Main Methods:

• Regression models were used to analyze the relationship between stroke volume, inverse total arterial compliance (inv TAC), and systemic vascular resistance (SVR) with mean and systolic blood pressures.
• The study included 67 non-dialysis and 48 dialysis CKD patients.
• Receiver operator characteristic curve analysis assessed the predictive value of these factors for elevated blood pressure.

Main Results:

• Stroke volume showed a stronger association with mean arterial pressure than SVR, and they contributed equally when analyzed together.
• Stroke volume and inv TAC equally contributed to systolic blood pressure variations.
• These associations were similar in both non-dialysis and dialysis CKD patients.
• Elevated systolic blood pressure was predicted by stroke volume and inv TAC, but not SVR.

Conclusions:

• Both volume load and vascular mechanisms are critical considerations for managing hypertension in CKD.
• The influence of volume load and vascular mechanisms on blood pressure is similar in non-dialysis and dialysis CKD patients.