stitches?
stitches?
OldManEmu said:
MSG Morrissey my understanding is a modern design mechanical valve like yours has an indefinite service life. The problem with these valves in the longer term 30+ years tends to be related to the deterioration of the stitches that are holding them inplace.
Do you have a citation for this "deterioration of stitch problem". Some people
have reported that their valves were explanted due to a "stitches coming loose".
However, the FEW studies which document an explant of a valve never noted this problem. Also, when pressed for specifics, pts. tend to be unclear about the precise problem, ie., did the sitches deteriorate or did the heart tissue
just tear out due to a natural weakening of the heart tissue as people age.
This is true of mech. or tissue valves and can happen in a few years if the
conditions are right. Surgeon describe this tissue as "friable" and it makes a very difficult surgery for reoperations!
Furthermore, for the most part, the tendency is for the heart tissue to
encase the the sewing ring. This growing-in process making the stitches unnecessary, much like the stitches a person has removed after a cut. This process of tissue growth can sometime be so vigorous and invasive that it can over grow the valve as I beleive some members have experienced on this%2%0
forum.
The botton line is mech. valves never wear out and rarely have to be replaced because the valve itself is the cause.