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A, Direct cardiac compressions; B, thoracic pump compressions. RV indicates right ventricle; LV, left ventricle; Pulm. circ., pulmonary circulation. (Reproduced with permission from Paradis NA, Halperin HR, Kern KB, Wenzel V, Chamberlain DA. Cardiac Arrest: The Science and Practice of Resuscitation Medicine. 2nd ed. Cambridge: Cambridge University Press; 2007)
