As regards a GA for Transpeineal Biopsy, before doing this it is usual for the patient to undergo various preop tests to ensure he is up to it. I remember I had to provide a urine sample they could grow as a culture, rather than do a dip test to ensure there was no infection. The anaesthetist was not immediaately happy with ECG and I had to have another and wear a device connected to points on my chest for 48 hours and because my blood oxygen levels were deememed too low, I had to do this test again having taken some big breaths. Eventually all was considered OK. My case is probably somewhat rare but it shows how much care is taken when a GA is given. In any case a Template Biopsy is not a long or major operation.
The worst part is the catheter which has to be worn for a week or so.after the OP I found that I needed to ease myself down when sitting and leaning back. You don't want to get your weight forward so you crush the part the needles have gone through!
A pretreatment PSA of 8 is not very high for a man of your husband's age and some consultants don't even consider 3+3 to be Cancer. however, by carefully targeting the suspicious area, any higher grade Gleason that is there should be found.
I was about your husband's age when first diagnosed but thanks to treatment am still here at 88 and am in remission. So both of you don't let this disease get you down!