TY - JOUR
T1 - Heparin clearance profiles after systemic anticoagulation using a heparin removal device system
AU - Tao, Weike
AU - Callahan, Jon D.
AU - Vertrees, Roger A.
AU - Brunston, Robert L.
AU - Deyo, Donald J.
AU - Mcrea, James C.
AU - Zwischenberger, Joseph B.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1997
Y1 - 1997
N2 - An extracorporeal heparin removal device system (HRDS) based on plasma separation and affinity adsorption has been developed to reduce the risks of protamine-related adverse reactions. The heparin clearance profile of the HRDS was characterized by the first-order exponential depletion. A mathematical model was established to predict the time to achieve 85% heparin removal for different body weights at 700 ml/min and 1400 ml/min extracorpurea HRDS blood flow. With an HRDS flow of 700 ml, 85% of total body hepaorin removal cannot be achieved within 30 min for subjects greater than 50 kg. With an HRDS flow of 1400 ml/min, 85% heparin removal can be achieved within 32 min for subjects larger than 90 kg. Such model predictions were validated in an adult swine (n = 10) model of 60-min, hypothermic (28°C) cardiopulmonary bypass (CPB). Animals were given 300 U/ kg intravenous heparin and 5000 U heparin in the circuit prime for initial heparinization, with subsequent heparin given to maintain activated clotting time above 450 sec. Immediately following CPB, plasma heparin concentration as determined by anti-factor Xa assays was 4.40 ± 1.08 U/ml in the 700 ml/min group and 4.78 ± 0.70 U/ml in the 1400 ml/min groups, respectively (p > 0.05). Target HRDS flow was 700 ml/min for animals below 75 kg and 1400 ml/min for animals above 75 kg. The mean body weight in the 1400 ml/min group (81.4 ± 3.7 kg) was significantly higher than that in the 700 ml/min group (67.2 ± 2.2 kg) (p < 0.05), with the actually achieved HRDS flow 658.5 ± 20.8 and 1437.4 ± 30.1 ml/min, respectively. During the HRDS run, plasma heparin concentration followed the predicted first-order exponential depletion (r2 = 0.97 for the 700 ml/min group and r2 = 0.99 for the 1400 ml/min group). In the 700 ml/min group, the time needed to achieve 85% heparin clearance was over 40 min, whereas in the 1400 ml/min group, this time was reduced to less than 30 min despite greater body weight. At 30 min on HRDS, the 700 ml/min group had 27.4 ± 3.7% heparin left in the plasma, whereas the 1400 ml/min group had only 12.6 ± 2.5% (p < 0.05). The authors conclude heparin clearance by the HRDS can be precisely predicted with the mathematical model of first-order exponential depletion. Increasing the HRDS flow can effectively reduce the time needed to achieve a targeted heparin removal.
AB - An extracorporeal heparin removal device system (HRDS) based on plasma separation and affinity adsorption has been developed to reduce the risks of protamine-related adverse reactions. The heparin clearance profile of the HRDS was characterized by the first-order exponential depletion. A mathematical model was established to predict the time to achieve 85% heparin removal for different body weights at 700 ml/min and 1400 ml/min extracorpurea HRDS blood flow. With an HRDS flow of 700 ml, 85% of total body hepaorin removal cannot be achieved within 30 min for subjects greater than 50 kg. With an HRDS flow of 1400 ml/min, 85% heparin removal can be achieved within 32 min for subjects larger than 90 kg. Such model predictions were validated in an adult swine (n = 10) model of 60-min, hypothermic (28°C) cardiopulmonary bypass (CPB). Animals were given 300 U/ kg intravenous heparin and 5000 U heparin in the circuit prime for initial heparinization, with subsequent heparin given to maintain activated clotting time above 450 sec. Immediately following CPB, plasma heparin concentration as determined by anti-factor Xa assays was 4.40 ± 1.08 U/ml in the 700 ml/min group and 4.78 ± 0.70 U/ml in the 1400 ml/min groups, respectively (p > 0.05). Target HRDS flow was 700 ml/min for animals below 75 kg and 1400 ml/min for animals above 75 kg. The mean body weight in the 1400 ml/min group (81.4 ± 3.7 kg) was significantly higher than that in the 700 ml/min group (67.2 ± 2.2 kg) (p < 0.05), with the actually achieved HRDS flow 658.5 ± 20.8 and 1437.4 ± 30.1 ml/min, respectively. During the HRDS run, plasma heparin concentration followed the predicted first-order exponential depletion (r2 = 0.97 for the 700 ml/min group and r2 = 0.99 for the 1400 ml/min group). In the 700 ml/min group, the time needed to achieve 85% heparin clearance was over 40 min, whereas in the 1400 ml/min group, this time was reduced to less than 30 min despite greater body weight. At 30 min on HRDS, the 700 ml/min group had 27.4 ± 3.7% heparin left in the plasma, whereas the 1400 ml/min group had only 12.6 ± 2.5% (p < 0.05). The authors conclude heparin clearance by the HRDS can be precisely predicted with the mathematical model of first-order exponential depletion. Increasing the HRDS flow can effectively reduce the time needed to achieve a targeted heparin removal.
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U2 - 10.1097/00002480-199711000-00014
DO - 10.1097/00002480-199711000-00014
M3 - Article
C2 - 9386844
AN - SCOPUS:0031282387
SN - 1058-2916
VL - 43
SP - 922
EP - 926
JO - ASAIO Journal
JF - ASAIO Journal
IS - 6
ER -