Bobbi Kristina Brown's partner Nick Gordon believes his voice has the power to wake her from her coma.

The 22-year-old, who has reportedly been banned from visiting Whitney Houston's daughter as police continue investigating the events leading to her being rushed to hospital, made an emotional plea on social media.

In a string of tweets, Gordon claimed her condition would only improve once they had been reunited. "Let me in the hospital to see my girl and let her hear my voice SHE WILL WAKE UP!!!" he said in one desperate post.

A frustrated Gordon then criticised her father Bobby Brown, claiming that he had only seen his daughter in "4 times in the last 5 yrs".

He wrote: "Listen at the end of all this I took care of Whitney Houston and Kriss which was very hard on someone my age.

He added: "Grow up. Your daughter is going to hate you when she wakes up."

Brown has been in a coma at Emory University Hospital, Atlanta, since she was found face down in a filled bath at the young couple's home on 31 January. Gordon administered CPR until the ambulance arrived on the scene and continued to carry out lifesaving procedures.

The harrowing incident echoes the death of her mother on the eve of the 2012 Grammys. Houston passed away on 11 February 2012, when she was found unresponsive in a bath of a Beverley Hills hotel. A coroner later concluded her death was as a result of accidental drowning, though heart disease and cocaine use were contributing factors in her death.

Gordon's online rant came hours after lawyers from the Brown family told Gordon he will not be allowed at her bedside until he reveals exactly what happened the evening before she was found unconscious.