If this is acute, then it is infection.
It can be a neuropathy from a compressed nerve, very lowest spine.
It can be part of a pelvic pain syndrome, chronic pelvic pain syndrome, often with prostatitis.
You need to see a urologist for an exam.
An exam and probably ultrasound are needed to narrow this down.
What was found on autopsy was coronary heart disease.
But no complete blockages.'
This is not the same as CHF
If they found CHF this would have meant the heart was not pumping well, which can be for multiple reasons.
If he had a heart attack, this could do it.
It can also be chronic for years, and the patient can "compensate" which means it does not have symptoms, unless the patient is stressed beyond their compensations. For example, walking is OK, but running a marathon would brink out symptoms, or trying to run a marathon.
I am very sorry about your dad.
It is unclear that there was anything wrong here on the part of the doctors.
Delaying the surgery was not an option with perforated bowel.
So, yes, the stress of surgery could bring out other chronic problems, but that is a standard risk of this surgery.
If there were problems with his heart that they could have seen before surgery, and if they did not do something during surgery that should have been done for his heart, then this could be sub standard care, but there is nothing in your story at this point to indicate this.
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