There was a significant relationship between preoperative pressure and change in pressure that held true for all subgroups (change = -0.7 x preoperative pressure + 31, r = 0.69). Analysis of the functional results confirmed that patients with high preoperative pressure are at risk for severe falls after surgery and are not guaranteed a good result. Conversely, patients with low preoperative pressures may actually have an increase with surgery and are not always incontinent. Patients with low preoperative anal resting pressures should not be denied anastomosis to the anus if they are continent.

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