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J Surg Res. 2015 May 1;195(1):196-203. doi: 10.1016/j.jss.2014.12.004. Epub 2014 Dec 9.

Developing dual hemofiltration plus cardiopulmonary bypass in rodents.

Author information

1
Center for Resuscitation Science, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA; Department of Emergency and Critical Care Medicine, Chiba University, Chiba, Japan. Electronic address: koichiro.shinozaki@uphs.upenn.edu.
2
Center for Resuscitation Science, Department of Emergency Medicine, University of Pennsylvania, Philadelphia, PA.
3
Division of Cardiovascular Surgery and Surgical Critical Care, Department of Surgery and Traumatology, National Taiwan University Hospital, Taipei, Taiwan.
4
Department of Emergency and Critical Care Medicine, Chiba University, Chiba, Japan.

Abstract

BACKGROUND:

Emerging therapies for prolonged cardiac arrest (CA) include advanced circulatory interventions like emergency cardiopulmonary bypass (ECPB) and continuous venovenous hemofiltration (CVVHF). However, preclinical studies are limited because of the absence of a practical method of using CVVHF along with ECPB in rodents.

METHODS:

We modified a CA model with ECPB resuscitation to include the CVVHF circuit. Adult rats were cannulated via the femoral artery or vein and the jugular vein for the ECPB circuit. A new circuit for CVVHF was added to allow ECPB and CVVHF to be started simultaneously. CVVHF blood flow at 3 mL/min could be controlled with a screw clamp during ECPB. After cessation of ECPB, the CVVHF flow was maintained using a roller pump. The filtration rate was controlled at 40 mL/h/kg in the standard volume of CVVHF and 120 mL/h/kg in the high volume (HV) of CVVHF. The driving force of hemofiltration was evaluated by monitoring transmembrane pressure and filter clearance (FCL).

RESULTS:

Transmembrane pressure in both groups was stable for 6 h throughout CVVHF. FCL of blood urea nitrogen and potassium in the standard volume group was significantly less than the HV group (P < 0.01). FCL of blood urea nitrogen and potassium was stable throughout the CVVHF operation in both groups.

CONCLUSIONS:

We developed a method of CVVHF along with ECPB in rodents after CA. We further demonstrated the ability to regulate both standard and HV filtration rates.

KEYWORDS:

Cardiac arrest; Cardiopulmonary bypass; Hemofiltration; Resuscitation; Rodent

PMID:
25555403
DOI:
10.1016/j.jss.2014.12.004
[Indexed for MEDLINE]

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