<s>[INST] ?. My father-in-law has emphysema, very thin (125 ish),on lots of medication,recently trouble with fluid in lower legs. Low O2 blood levels, Just started full time oxygen. But my question is..Heart rate of 130 at most of the time? (Also just stopped smoking because of the O2). Is the heart rate part of the process or is it a preventable issue? [/INST] Hello,Thanks for writing to Health Care magic, I am Dr , Muhammad Ahmad , I have read your question closely, I understand your concern and will be helping you with your health related problem.Let me tell you some basics to understand, blood carries oxygen and heart pumps blood to all parts of the body to supply oxygen to farthest parts of the body. When there is low quantity of oxygen in the blood the heart has to pump more times per minute to supply same quantity of oxygen to the tissues.Yes in case of low oxygen saturation in the blood faster heart rates are normal to find in the patient. It is definitely preventable by taking measures to treat the underlying issues , that is respiratory failure in this case, if you can correct the respiratory failure and oxygen saturation of the blood goes back to normal the heart rates will get back to normal automatically.I hope this answered your question, If you have more queries I am happy to answer you.Regards.Dr.Muhammad Ahmad </s>