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Hello, this is Dr. David. I am reviewing your question now and will be with you momentarily.
I am sorry about your dad
that is good he has had some testing.
he should get an doppler ultrasound and angiogram study of the blood vessels of the leg.
if he is of advanced age, he could be having narrowing of blood vessels leading into the leg called arterial stenosis which can cause claudication circulation pain. sometimes these blood vessels can be widened by an angioplasty procedure or stent procedure.
medications such as Trental (pentoxifylline) can help blood vessels become more flexible and go through smaller blood vessels.
he may have to see a vascular surgeon doctor for more specific blood vessel tests.
also he should get blood tests for creatinine kinase to check for muscle inflammation or myositis in his calf muscles
let me know if you have questions