Thanks for your question. This may be a difficult problem for your mother that requires significant medical help to help her reach her full potential and best pulmonary status. There are a number of possible explanations. Of course her pulmonologist
will be the best person to answer these questions, as he or she has more information available. It is always advised that you follow your doctor
's recommendations, and discuss any concerns that you may have if there are any. Problems with a lack of pulmonary reserve can come from a number of different factors. If her lungs themselves have been injured or scarred in the past, it can make it difficult for her to have sufficient functioning air cells to effectively exchange oxygen for carbon dioxide and vice versa. Some of the medications that are prescribed are designed to decrease inflammation and improve the body's ability to exchange air. One thing that is sometimes overlooked is the fact that other issues can seem to be related to lung exchange, but actually stem from other causes. For example, severe anemia can result in some of the same symptoms, as can many heart problems. Please speak with your doctor about these questions.