It's not in our policy to do this, nor would I do it because I believe in being covered by my institution's policy for obvious reasons, but I know a lot of older healthcare professionals who have seen/done it and said it works like a charm. Consider that many times it's a coughing spell, straining on the toilet, shifting around in bed, etc. that irritates the heart and results in various dysrhythmias, I really don't think it far-fetched that a violent TSC could cause problems.