Park M, Mendes PV, Hirota AS, dos Santos EV, Costa ELV, Azevedo LCP. Blood flow/pump rotation ratio as an artificial lung performance monitoring tool during extracorporeal respiratory support using centrifugal pumps.
Rev Bras Ter Intensiva 2015;
27:178-84. [PMID:
26340159 PMCID:
PMC4489787 DOI:
10.5935/0103-507x.20150030]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 05/10/2015] [Indexed: 01/19/2023] Open
Abstract
Objective
To analyze the correlations of the blood flow/pump rotation ratio and the
transmembrane pressure, CO2 and O2 transfer during the
extracorporeal respiratory support.
Methods
Five animals were instrumented and submitted to extracorporeal membrane
oxygenation in a five-step protocol, including abdominal sepsis and lung
injury.
Results
This study showed that blood flow/pump rotations ratio variations are dependent on
extracorporeal membrane oxygenation blood flow in a positive logarithmic fashion.
Blood flow/pump rotation ratio variations are negatively associated with
transmembrane pressure (R2 = 0.5 for blood flow = 1500mL/minute and
R2 = 0.4 for blood flow = 3500mL/minute, both with p < 0.001) and
positively associated with CO2 transfer variations (R2 = 0.2
for sweep gas flow ≤ 6L/minute, p < 0.001, and R2 = 0.1 for
sweep gas flow > 6L/minute, p = 0.006), and the blood flow/pump rotation ratio
is not associated with O2 transfer variations (R2 = 0.01 for
blood flow = 1500mL/minute, p = 0.19, and R2 = - 0.01 for blood flow =
3500 mL/minute, p = 0.46).
Conclusion
Blood flow/pump rotation ratio variation is negatively associated with
transmembrane pressure and positively associated with CO2 transfer in
this animal model. According to the clinical situation, a decrease in the blood
flow/pump rotation ratio can indicate artificial lung dysfunction without the
occurrence of hypoxemia.
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