Hello, I am seeking help to understand the link between Congestive Cardiac Failure and coughing. I am caring for my 83 yr old Mother who has COAD, having been a smoker for more than 55 years. Mum is now on supplemental Oxygen 24/7 from an Oxygen concentrator (4L/min). Mum used to cough all the time which i put down to her chronic Bronchitis. However since her Furosemide has been increased, her coughing has greatly subsided, which makes me wonder if her cough is more related to fluid build up around her lungs and heart as a result of her heart failure. 10 weeks ago Mum's doctor increased her Furosemide to 60mg mane and within days the cough subsided, and this lasted for about six weeks. 4 weeks ago Mum developed a stasis ulcer on her ankle and to treat the oedema and because mum was beginning to cough more, the Doctor increased Mum's Furosemide to 80mg mane, and again the cough subsided. A few days Mum's cough returned and the her Doctor increased her lasix (Furosemide) to 100mg and again the cough subsided. Of all the medications my Mother is taking, Furosemide seems to me to be the one that is giving her the most comfort in her last days. I would like to understand the link between excess fluid around the heart and lungs and how this causes Mum to cough. I am having trouble finding this information. Could somebody provide me with a link to either journal articles or where this is explained online?