Hello Chris, I’m sorry about the passing of your husband. It’s possible your husband experienced an exacerbation which caused his ipf to get extremely worse and require more oxygen. During my experience I had contracted RSV and subsequently this caused an exacerbation and my oxygen needs multiplied. Try speaking to his physician and maybe they can give you an answer. I’m not sure if sustaining an injury would require his oxygen needs to increase. Happy new year to you and your family and I hope 2021 is better for you. Mark