Good even if you’re not a medical professional
Have you ever tried to tie a Reef Knot with line that is somewhat slippery only to have it loosen before you can finish it? One solution to this problem is to enlist the help of a friend who can lend you a finger to hold the line secure while you make the second turns. An alternate to that, and one that I use from time to time, is to tie a Surgeon’s Knot as opposed to a basic Reef Knot. The added friction of the additional turns really do help to stop the line from slipping. Check it out… it works.
I wonder if our surgeon friends actually use this knot?