When cardiac arrest strikes, every second counts. The difference between life and death often depends on how well chest compressions generate blood flow to vital organs. Understanding the hemodynamics of chest compressions reveals why proper technique matters so much in cardiopulmonary resuscitation. The Science of Hemodynamics in Chest Compressions Hemodynamics refers to the forces and mechanisms that drive blood circulation throughout the body. During cardiac arrest, the heart stops pumping blood effectively. Consequently, chest compressions must artificially recreate the hemodynamic forces needed to maintain circulation. Effective chest compressions work through two primary hemodynamic mechanisms. First, direct cardiac compression squeezes the heart between the sternum and spine, forcing blood out of the ventricles. Second, the thoracic pump mechanism increases intrathoracic pressure, creating a pressure gradient that drives blood flow. Research shows that optimal hemodynamics...