It might. It's worth a try. This is what so many of us do when we realize, or suspect, that we have triggers that need to be stopped or minimized, and we all look for quick fixes that might stem either the onset or the actual presence of AF if it is taking place. Some step out onto a winter balcony or back deck, or they step into a cold shower, or they bend over a sink and pour cold tapwater over their heads. The shock can induce a reversion to NSR, and there's a big sigh of relief. For a while, anyway.