It's best to avoid constipation at all costs, not just take remedial action when it occurs. When the gut is even partially blocked and slow to move things along, it actually causes the gut to stretch.
When this happens on a regular basis the gut will not return to its normal size, just like continually stretching an elastic band, the elasticty is lost and it becomes slack. You then have this distended area of gut which, when a bit emptier, can fold over on itself and cause a complete blockage..... a volvulus.
This is how the consultant explained it to us and also told my OH that it was very important that this did not happen again as, if it did, it could result in a far less favourable outcome where they might not be able to successfully join up the two ends of the colon and thus have to have a bag.
So, it's Movicol for prevention in our house so that constipation is kept at bay.
Sorry for the gory details but this is something that we both feel strongly about sharing if it helps just one person not to go through what we did.Well, me actually, as OH was oblivious to most of the 3 weeks in hospital.