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Effect of flow rate, negative pressure, and duration of modified ultrafiltration on hemodynamics and inflammatory

Wei Wang1, De-ming Zhu, Hui-min Huang

  • 1Department of Pediatric Thoracic and Cardiovascular Surgery, Shanghai Children's Medical Center, Shanghai Jiao Tong University, School of Medicine, Shanghai, China.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|January 24, 2007
PubMed

Insights

Modified ultrafiltration (MUF) effectively improves cardiac function in children with congenital heart disease. Longer MUF duration filters more inflammatory mediators, though trends may not reverse within 15 minutes.

Area of Science:

  • Pediatric Cardiology
  • Cardiovascular Surgery
  • Critical Care Medicine

Background:

  • Congenital heart disease (CHD) often requires surgical intervention, leading to potential complications like hemodilution and inflammation.
  • Modified ultrafiltration (MUF) is a technique used to manage fluid balance and remove inflammatory mediators during cardiopulmonary bypass.
  • Optimizing MUF parameters is crucial for improving outcomes in pediatric cardiac surgery.

Purpose of the Study:

  • To evaluate the impact of varying flow rates, negative pressures, and durations on the efficacy of modified ultrafiltration (MUF).
  • To assess the effects of different MUF protocols on hemodynamic parameters, body weight, hematocrit, and inflammatory markers in pediatric patients with CHD.

Main Methods:

  • Eighty children (<10 kg) with CHD were randomized into four groups: conventional MUF (C), high flow rate MUF (H), high negative pressure MUF (P), and long duration/high flow rate MUF (L).
  • Measurements included body weight, hematocrit, hemodynamics (heart rate, blood pressure), and inflammatory mediators (tumor necrosis factor, interleukin-6) at various time points.
  • Statistical analysis compared outcomes across the four MUF groups.

Main Results:

  • MUF durations in groups H and P were significantly shorter than in groups C and L.
  • Group L achieved a significantly greater filtered volume compared to the other groups.
  • Changes in body weight, heart rate, blood pressure, and hematocrit were comparable across all groups.
  • The increase in inflammatory mediators was slightly lower in group L, suggesting a potential benefit of prolonged MUF duration.

Conclusions:

  • Modified ultrafiltration is effective in reversing hemodilution and enhancing cardiac function in pediatric CHD patients, even with high flow rates or negative pressures.
  • Prolonging MUF duration can lead to greater removal of inflammatory mediators.
  • While MUF can reduce inflammatory mediator levels, the overall trend of increase may not be fully reversed within a 15-minute timeframe.

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