In a child with cardiopulmonary arrest, intraosseous access should be attempted, if venous access is not available within:

a. 1 minute(Ref: Nelson's 20/e p 523-528, Ghai 8/e p 715-718)If venous access is not available within 1 minute in a child with cardiopulmonary arrest, an IO needle should be placed in anterior proximal tibia