Introduction
chest compression
CARDIOPULMONARY, SUDDEN CARDIAC ARREST
Cardiopulmonary resuscitation (CPR) guidelines have been periodically updated to improve CPR quality and clinical outcomes of patients with sudden cardiac arrest. Adequate chest compression has long been recognized as an essential factor for high-quality CPR. The mechanism of blood flow during CPR was proposed in two theories, the "cardiac pump" and “thoracic pump” theories. According to the cardiac pump theory, chest compressions serve to directly pump blood from heart into circulation, occurring concurrently with the opening of aortic and pulmonary valves and the closure of mitral and tricuspid valves. In contrast, the thoracic pump theory presumes that chest compression lead to an increase in intrathoracic pressure, thereby generating forward blood flow within intrathoracic vesselsThe 2020 edition along with the preceding 2010 edition of the AHA guideline for CPR recommended that the rescuer should compress at the lower half of the sternumThe aforementioned researches reflect the inconclusive findings of the proper locations of the hand position during CPR. In addition, the differences between ethnicity and body configuration could possibly affect the accuracy of the hand position. Therefore, this study aims to determine the optimal anatomical position that can maximize the compression of the left ventricle while avoiding damage to abdominal organs through CT image analysis.