<prompt> The ideal parameters for cardiac massage in cardiopulmonary resuscitation are all except ?Force should depress sternum by 112 inchesRatio of compression to ventilation should be 15:2Compressions to be given over lower third of sternumForce should depress sternum approximately 13 of chest wall diameter  <response>: Ans. is b, i.e., Ratio of compression to ventilation should be 15:2 