You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A 6 months old child having severe dehydration comes to the casualty with weak pulse and unrecordable B.P. Repeated attempt in gaining I.V. access has failed – The next best step is – and explain in detail?
"If I.V. route is unsuccessful, introasseus access in the proximal tibia of an uninjured leg is the preferred alternative for children younger than 6 yrs. In children older than 6 yrs a percutaneous femoral venous line should be attempted.