The swelling, and problems with breathing, are most likely congestive
heart failure,
and the treatment your father received is correct. However, ongoing lasix would be helpful for at home.
Congestive heart failure can be controlled well with Coreg, lasix, a low sodium diet, and other meds that his doctor thinks would be beneficial in his situation. No alcohol, or smoking, and when the swelling is great, it would help for him to keep his feet up as much as possible.