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Thanks for consulting me at virtual clinic. I have carefully worked through your case, and I can realize your health worries. Being your physician, I assure you not to worry as I will take care all of your medical concerns.
There may be some reason for the low cardiac capacity and
low cardiac output. To list some are :
Muscles get weak if they have low blood supply due to
artery blockage.
Atrial
fibrillation is a cause of improper heart pumping functions.
Walls of chambers of heart become thick and filling of heart becomes less efficient.
Consult you cardiologist to rule out these causes.
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Regards!
DR. HANIF
PHILADELPHIA, USA