Ng Suk-yin suffers from pulmonary arterial hypertension. The arteries in her right lung have shrunk, making it difficult for her heart to supply blood to the organ.

This condition is a complication resulting from mixed connective tissue disease, an autoimmune disease that she was diagnosed with in 2014.

She began experiencing serious symptoms five years after diagnosis, which has resulted in her losing her job as an intensive care assistant. Last year, her condition further deteriorated and her name was added to the lung transplant waiting list.

On June 27, Ng was admitted to the intensive care unit at Grantham Hospital. Her attending physician, Michael Wong Ka-lam, said that in her current state, she had to be regularly fed cardiotonic drugs.

He added they are currently searching for a brain-dead donor with a blood type of either A or O and a height between 127 and 171 centimeters.

"Based on Ng's condition, we need a lung transplant quickly If her condition keeps worsening, it would only be riskier to undergo surgery," Wong said, adding that her life could end at any moment.

Yan See-wan, associate consultant at the hospital's tuberculosis and chest medicine department said: "The chance of us finding a match is low. The probability is 20 percent as there are so many requirements to meet."

Older sister Yuki Ng said her sister had dedicated her days to saving the lives of patients. She added: "We hope we can find an appropriate lung for transplantation to save my sister's life and allow her to go back to her job and help more patients."

Hong Kong has seen four lung transplants this year, and there are currently 18 patients on the waiting list.