Maybe I have trapped gas in my chest. For years, I have been consuming Metoprolol Tartrate for what feels like irregular heartbeat every now and then. I The feeling occurs sporadically and frequently, causing me to take more MT. I felt the sensation again and thought to check my pulse; My hearbeat was normal, but, the unpleasant sensation in my chest, felt like skipped heartbeats. Could it indeed be trapped gas, escaping? I did burp a little this time.