Dad 80 y , bp swings from 97/56 to 155/87 over successive days about 3 times a month.otherwise bp is normal.daily 5mg cilindipline. no sympts. takes daily walks & uses exercise bike. on an antibiotic for uti 2 wks ago. serious heart problems?

Good BP!: These are fine BPs for an 80 year old! The main possible risk is that 97/56 is on the low side and could make him light headed if it drops quickly. But a few times probably is harmless, and certainly 155/87 from time to time also is just fine. To be completely safe, he should check with his doctor about it. But most likely all is well.