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Chest compression techniques: (A) 2-thumb-technique, (B) 2-finger-technique, (C) over-the-head 2-thumb-technique, (D) knocking-fingers-technique, (E) percentage changes of stroke volume, (F) end diastolic volume, (G) maximal rate of rise of left ventricular pressure (dp/dt max), and (H) minimum rate of change of ventricular pressure (dp/dt min) to baseline. * Significantly different from 2-thumbs-technqiue (p < 0.05, Tukey).
