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Abdominal counterpulsation in cardiopulmonary resuscitation: Animal models and theoretical considerations

  • Charles F. Babbs
    Correspondence
    Address reprint requests to Dr. Babbs: Biomedical Engineering Center, A. A. Potter Building, Room 204, Purdue University, West Lafayette, IN 47907.
    Affiliations
    Biomedical Engineering Center, Purdue University, West Lafayette, Indiana, USA.
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      Abstract

      Abdominal counterpulsation improves blood flow during other-wise standard CPR in animal models and in electronic models of the circulation. The method generates both central aortic and central venous pressure pulses. Success depends upon maximizing the former and minimizing the latter. Solution of a simple, first-order, differential equation may provide insight into proper technique. The equation suggests that the central arteriovenous pressure difference is maximized when pressure is applied directly over the abdominal aorta and when fluid loading is avoided. Proper technique may be critical in generating the largest possible arteriovenous pressure difference.

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