Hi,
Noted the history about your husband having weight gain of 20 lbs, given Lasix for diuresis, undergoing cardiac testing and the stomach is getting larger.
Your history is self-explanatory wherein the possible causes are:
Cardiac failure.
Kidney problem.
Liver
cirrhosis causing
ascites and fullness of stomach.
Anemia.
Hypoproteinemia and so on.
This can be diagnosed by the following ways:
Detailed history, clinical evaluation and an actual physical examination.
All the above causes mentioned have to be seen for by doing relevant tests of blood, urine, stool,.
Ultrasonography of abdomen.
X-ray Chest.
Detailed kidney, liver and cardiac tests.
The treatment will be obviously as per the findings and final diagnosis thus made.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General Surgeon