There may be 3 incisions if doctors put a clamp on a nerve that has been cut or excised. See other references to reversal below because this is one of the major factors in deciding between the two different types of surgery. Because the nerve is not completely destroyed, the hope is that slight moisture remains on the hands that is needed for doing things such as driving, gripping, holding, turning paper, etc. However, the excessive amount of sweat associated with hyperhidrosis and facial blushing is eliminated. Clamping pressure can be adjusted at the time of surgery.
Some doctors don t worry about clamping pressures and clamp tighter than others.
There are also different types of clamps that have different pressures that can be applied to them. Very debateable issue. More predictable side affects. Very debatable issue. Very debatable issue.