If this is a fast intake of breath that is sort of staggered, I experienced these both before and after my surgery. Before surgery it would happen infrequently, and always concerned me for a few minutes after which I would move on with whatever I was doing. After my surgery I had these quite often, only now I could hear my heart beat since I had a mechanical valve in my chest. What I found was that every time I had the little breath catch/sharp intake, I was also experiencing an irregular, fast heart beat or a palpitation. My heart would flutter a bit, then settle back into rhythm. While this was going on my breath would catch/hitch, then resume back to normal. I had these quite a bit (along with Atrial Flutter) after my surgery, and over time these have gone away almost completely. My two cents...