Four-year-old Tang Tsz-ching regained consciousness yesterday, a day after a five-hour, life-saving operation to correct her rare heart condition. Tsz-ching, who was born with four heart defects, was in a satisfactory condition at Westmead Children's Hospital in Sydney, medical staff said. Her father, Tang Kwai-wa, said: 'She is better than yesterday. She regained consciousness in the morning and complained of being in pain.' Her high blood pressure had receded and two of the 10 wires connected to her body to help it function had been removed. Doctors have said the operation, which involved closing a hole in the heart and removing an obstruction to the flow of blood, was successful. However, a more detailed picture will not be clear until tomorrow, when she is expected to be removed from the intensive-care unit. Tsz-ching is likely to spend Christmas at the hospital and be back at school next year. About 400 pupils at Tsz-ching's school - St Johannes College in Kowloon Tong - will say prayers for her today, as they did when she was having the operation. Barbara Chung Kwai-ying, head teacher of the Catholic school, said: 'Many students don't know her in person. But they remember her because of her smiling face. I am so worried, and I hope I will be able to fly over to Australia to see her.' The South China Morning Post earlier revealed that Tsz-ching's operation was made possible after a director at the school offered to foot the bill of up to $500,000, which her family could not afford. Ms Chung said the director, who wished to remain anonymous, had been concerned about Tsz-ching's condition despite never having met the family. 'He calls us every day to get an update on her condition,' she said. The girl's mother, Tang Cheng Yin-kwan, 30, who is six months' pregnant with a second child, is taking it in turns with her husband to be at Tsz-ching's bedside 24 hours a day. Yesterday, the four-year-old's grandmother, two cousins and their parents also paid a visit. The girl's uncle, Dr Sidney Lo Tsz-ho, a cardiologist in Sydney, also took an hour-long drive to see her after work. 'She's very cute and intelligent,' said Dr Lo, who helped the family arrange the operation.