A patient with breathing difficulties jumped six floors to his death after leaving a note accusing doctors and nurses of ignoring his requests to replace a malfunctioning oxygen mask, the Coroner's Court heard yesterday. But medical staff of Princess Margaret Hospital told the inquest into the death of Ho Man-sum that they had changed the mask several times although they had never spotted any fault in his breathing apparatus. The inquest before coroner Michael Chan Pik-kiu is seeking to find out why Ho, a 50-year-old man with no history of depression or mental illness, would choose to end his life on a day when his symptoms had stabilised. Ho's younger daughter, Ho Ka-wai, told the coroner her father had often complained about the oxygen mask during his stay in the hospital. 'He complained every other day that the mask did not provide enough air, but he said the nurses never paid him much attention, yet he wouldn't allow us to file complaints because he was afraid they would be even worse to him if he did,' she said. On the night of August 6 last year, hours after what a ward inmate described as a happy family gathering, Ho unplugged the tubes connecting him to life-support systems, smashed a window and jumped out. In his death note, Ho - who also suffered asthma and a bone disease called avascular necrosis - begged for a better oxygen mask and tranquillisers to ease his pain. 'The old mask pumped lots of air into my nose, but this one has no air ... it was not the machine that has problems, it was the mask. I kneel down and bow to you, I beg you ... please give me the green mask.' Registered nurse Cheng Mei-yee said Ho did not like the mask that pumped oxygen into his nose. She said he took it off 'up to 20 times a day when we put that on him'. Ms Cheng said that mask, attached to a machine that ensured patients received a certain amount of air, made breathing easier but could be uncomfortable to wear. The green mask that Ho asked for was a weaker breathing device. 'Ho repeatedly claimed the devices were faulty but three nurses made thorough checks of the apparatus and none found any faults,' Ms Cheng said. 'He just wouldn't be convinced,' she said, adding that staff had changed his mask on the day he died. She said Ho might have been confused because the breathing machine was adjusted several times according to his condition. A monitoring machine showed Ho's blood oxygen level was normal two hours before his death. Ms Cheng told the court she was helping patients in another ward when she heard strange noises from Ho's ward. She started running when an inmate screamed for help but Ho was already gone when she arrived at his ward. Ms Ho, who said her father spoke of the nurses' indifference and impolite attitude to his requests, asked Ms Cheng why she had not noticed the alarm signals from the disconnected life-support machines. 'The alarm only starts beeping 10 seconds after the machines were disconnected. By then the tragedy had already happened,' Ms Cheng said. The jury will give its verdict today.