This is Dr Basu, experienced Internal Medicine Specialist.
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Does he have worsening shortness of breath?
If not then the swelling can be due to the bad leg veins.
the fluid is accumulated under the skin outside the vascular space.
Lasix or any other diuretic will not work well.
Graduated compression stockings and physical therapy will help better to mobilize the fluid.
Lasix dose can be increased to 40 mg daily but with close monitoring of the electrolytes.
Lasix can cause low potassium and magnesium which can trigger arrhythmias.
This should be discussed with his doctor.
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