False about chest trauma

80% of chest injuries can be managed non operatively. Chest radiograph is the initial investigation of choice.If a sucking chest wound is present,this should not be fully closed,but should be covered with a one-way valve,& then an underwater drain should be placed.ECG should be done in all cases associated with sternal injuries to rule out hea damage. Reference:Bailey & Love's sho practise of surgery,25th edition,page no:341