Hi Julie, do you mean PVC’s? I am not familiar with SCPC or SVPV. I have had SVT(Supra Ventricular Tachycardia) and PVC’s, as well as A-Fib and PAC’s but never heard of what you are referring to. Having said that, I have also had Pericardial effusion 2-3 x’s, depending on how much fluid is around the heart then it might not be anything to be concerned about, the body may absorb it, or it might remain there without causing you further problems. Yes, one does feel short of breath and pressure on chest especially when lying down, you probably have minimal fluid and that’s why they are not concerned. I would report any increased SOB (shortness of breath), increased pressure or pain and any other adverse symptom to md promptly if you don’t get any improvement.