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Related Experiment Videos

Can haemodialysis-induced hypotension be predicted?

Yan Cai1, Andre Zimmerman, Søren Ladefoged

  • 1Department of Anaesthesia, Rigshospitalet, University of Copenhagen, Denmark. caiyan@yahoo.com

Nephron
|October 10, 2002
PubMed
Summary

Thoracic electrical impedance monitoring can predict hypotension during haemodialysis (HD). A significant increase in thoracic impedance or decrease in intracellular water can help prevent HD-induced hypotension by adjusting ultrafiltration rates.

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Area of Science:

  • Nephrology
  • Physiology
  • Biomedical Engineering

Background:

  • Haemodialysis (HD) ultrafiltration can decrease central blood volume, potentially leading to hypotension.
  • Thoracic electrical impedance (TI) is a method used to monitor central blood volume during HD.

Purpose of the Study:

  • To evaluate the utility of TI in predicting HD-induced hypotension.
  • To identify thresholds for TI and intracellular water changes that may indicate impending hypotension.

Main Methods:

  • 12 hypotensive-prone (H) and 13 non-hypotensive-prone (N) patients were monitored during HD.
  • Systolic blood pressure (SAP), heart rate (HR), TI, thoracic intracellular water (Th(ICW)), and total body impedance (TBI) were recorded.
  • Hypotension was defined as a decrease in SAP >/=30 mm Hg or SAP < 90 mm Hg.

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Main Results:

  • All 12 H patients developed hypotension; TI increased significantly earlier and to higher values in H patients compared to N patients.
  • Th(ICW) decreased significantly only in H patients, while HR showed variable changes.
  • TBI increased similarly in both groups, indicating it's not a reliable predictor of hypotension.

Conclusions:

  • HD-induced hypotension is linked to reduced central blood volume, affecting heart rate and red cell distribution.
  • Reducing ultrafiltration rate when TI increases by approximately 5 Omega or Th(ICW) decreases by 6 x 10(-4) may prevent hypotension.