'thumps' you can set your clock with

i am a 67 yr old retired physician.
i have had several stents placed on 2 separate
occasions and a ventricular aneurysmectomy [in
2001].

i had a guidant icd and biventricular pacer
placed in march 2006 for ischemic
cardiomyopathy.
the first evening after placement i had
intermittent spasms in my back causing visible
'jerks'.
a technician came to the room and adjusted the
output which relieved them completely.......i
thought.
when i got home i began having them again
quite often throughout the day and my local
cardiologist adjusted the output of the device in
jan 2007
this abolished all of the "jerks" or "thumps", [as
i called them], with one exception.
the thumps are in the left upper quadrant of the
abdomen and
feel like what  i imagine  a pregnant lady feels
when a
baby kicks.
they are not unbearable, but more of a nuisance.
they are visible and palpable by  another
observer.
almost every day since the adjustment i noticed
that i was having them in the afternoon...just a
series of 2 or 3 thumps.
i started keeping track of the times they
occurred.
the time was always between 1:28 - 1:32 p m.
when daylight saving came they occurred
between 2:28 - 2:32 pm., exactly one hour later!
i don't have them at any other time.
i could set my watch to them and be correct
within 4 minutes.

[strobdoc]

sorry, that was supposed to go to the doctors.

doc