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Cardio-Pulmonary Resuscitation (CPR) is an essential skill in the management of cardiac arrests1. CPR and early defibrillation are the two main influential factors on patient outcomes and survival5. Adequate technique such as hand placement helps ensure optimal External Cardiac Compressions (ECC) with the aims of increasing the likelihood of positive patient outcomes. Though the placement of dominant or non-dominant hand may have profound effects on ECC adequacy, no strong body of evidence exists in support of one or the other. The primary outcome of this study was to measure the pact of hand dominance on ECC measured by compression score.