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Not bad: Passive leg raising in cardiopulmonary resuscitation-A new modeling study

  • Identification data

    Identifier: PC:2669
  • Authors:

    María Jiménez-Herrera
    Yanru Zhang
    Christer Axelsson
    Yunzhang Cheng
  • Others:

    Author, as appears in the article.: María Jiménez-Herrera; Yanru Zhang; Christer Axelsson; Yunzhang Cheng
    Department: Infermeria
    URV's Author/s: JIMÉNEZ HERRERA, MARÍA FRANCISCA; Yanru Zhang; Christer Axelsson; Yunzhang Cheng
    Keywords: Cardiopulmonary resuscitation Cerebral perfusion Passive leg raising
    Abstract: Aim: To evaluate, using a simulated haemodynamic circulation model, whether passive leg raising (PLR) is able to improve the effect during cardiopulmonary resuscitation (CPR); to expose the possible reasons why PLR works or not. Materials and Methods: We adapted a circulatory model for CPR with PLR. First we compared cardiac output (CO), coronary perfusion pressure (CPP), blood flow to heart (Qheart), and blood flow to neck and brain (Qhead) of standard chest compression-only CPR with and without PLR; second we simulated the effects of PLR in different situations, by varying the thoracic pump factor (TPF) from 0 to 1; third we simulated the effects when the legs are lifted to the different heights. Finally, we compared our results with those obtained from a published clinical study. Results: According to the simulation model, (1) When TPF is in the interval (0,1), CPP, CO, Qheart, and Qhead are improved with PLR, among them with half-thoracic/half-cardiac pump effect (TPF is 0.5), CPP, CO, Qhead, and Qheart increase the most (by 14, 14, 15, and 17%). (2) When TPF is 1 (pure thoracic pump, with an emphysema or extremely thick thorax), PLR has almost no effect on CPP, CO, and Qheart (-1, 2, and 0%), whereas Qhead is increased by 9%; (3) Regardless of whether there is a cardiac or thoracic pump effect, PLR is able to increase Qhead by 9-15%. (4) When the legs are lifted to 30° to the ground, the volume transferred from legs to upper body is 36% of the initial volume in legs; when the legs are lifted to 45°, the volume transferred is 43%; when the legs are lifted to 60°, the volume transferred is 47%; when the legs are lifted to 90°, the volume transferred is 50%. Conclusion: Generally PLR is able to achieve improved cerebral perfusion and coronary perfusion. In some extreme situations, it has no effect on cardiac output and coronary perfusion, but still improves cerebral perfusion. PLR could be a beneficial supplement to CPR, and it is not necessary to lift the legs too high above the ground.
    Research group: Grup de Recerca en Infermeria Avançada
    Thematic Areas: Infermeria Infermería
    licence for use:
    ISSN: 1664-042X
    Author identifier: ; ; ;
    Record's date: 2017-02-23
    Journal volume: 7
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source:
    Article's DOI: 10.3389/fphys.2016.00665
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2017
    First page: Art.num. 665
    Publication Type: Article Artículo Article
  • Keywords:

    Reanimació cardiopulmonar
    Cardiopulmonary resuscitation
    Cerebral perfusion
    Passive leg raising
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