Please bear in mind that my reply is based solely on the limited information you have provided, so that I have to make certain assumptions, and these may not be correct.
Your aunt seems to be in deadly serious trouble. From what you say, it sounds as though she has developed acute bacterial endocarditis. That is, an infection by the Klebsiella bacterium (not a virus), affecting her valve. The dialysis means that her kidneys are no longer functioning. The tracheostomy is done for any patient who requires long-term ventilation, (which could be for a variety of reasons) so her doctors are prepared for a long haul. If the CAT scan was done of her head, then I presume that they are looking for evidence of a stroke : this is a possible complication of endocarditis.
Klebsiella is a particularly nasty bug, and it often resistant to most antibiotics, so treatment can be extremely difficult.
In some patients, the only life-saving treatment may be to re-operate, remove the infected valve, and replace it with another one. This is a desperate move though, and cannot be done unless at least two successive blood cultures ( special tests looking for the bug in the blood) are negative, and the patient is in all other aspects a good surgical risk. I don’t know anything about your aunt, but a patient in her condition poses a very grave surgical risk, so I doubt whether her cardiac surgeon would risk redo surgery on her.
Please ask for an appointment with her surgeon, to discuss her prognosis. It may be good, but it may also be quite bleak. Whichever your surgeon indicates, the family needs to know.
I wish you strength in the days ahead, and I hope that your aunt recovers. I would be grateful for any further news of her – please access this forum again if you can.
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