That answer wouldnt satisfy me. PN symptoms change over time as most of us can attest to. Because you havent had a symptom since you first got PN does not necessarily mean its not pn related. I also had cardiac tests includint ekg's, angiogram and stress test. My feet didnt start swelling until the summer a few years after i developed it. Heat does slow down nerve signal velocity. IM not saying that your swelling is definitely PN related but it could be.