Hepatic Oxygenation Changes and Symptomatic Intradialytic Hypotension

Area of Science:

• Nephrology
• Physiology
• Medical Monitoring

Background:

• Limited studies compare cerebral and hepatic oxygenation changes during hemodialysis (HD) in patients with and without intradialytic hypotension (IDH).
• Investigating tissue oxygenation differences is crucial for understanding HD-related complications.

Purpose of the Study:

• To compare intradialytic changes in cerebral and hepatic oxygenation between patients with and without symptomatic IDH.
• To determine if hepatic oxygenation changes can predict symptomatic IDH during HD.

Main Methods:

• Analyzed data from 109 patients undergoing HD, comparing those with (n=23) and without (n=86) symptomatic IDH.
• Monitored cerebral and hepatic regional oxygen saturation (rSO2) using an INVOS 5100c monitor.
• Compared rSO2 changes relative to the nadir of systolic blood pressure (SBP).

Main Results:

• Cerebral rSO2 changes did not significantly differ between groups.
• Hepatic rSO2 significantly decreased more in patients with symptomatic IDH compared to those without (p < 0.001).
• Changes in hepatic rSO2 showed excellent predictive ability for symptomatic IDH onset (AUCs up to 0.847).

Conclusions:

• Hepatic oxygenation decline during HD is a significant predictor of symptomatic IDH.
• Cerebral oxygenation changes do not reliably differentiate between patients with and without IDH.
• Monitoring hepatic oxygenation may aid in predicting and managing IDH during hemodialysis.