I have a heart abnormality that shows up as an inverted T-wave on an echo cardiogram. Some physicians will immediately think I'm having some sort of heart attack, though I display no symptoms. It's actually that my heart fills fully and empties fully in a single cycle. I'm not a medical professional, so all I have are laymans explanations, but what it means is that my heart beats less frequently but stronger than the average heart. It was documented thoroughly throughout my time in the Marines and a cardiologist suggested it wasn't a defect. My heart rate remains much lower than other peoples when under stress and my heart rate at rest is only slightly lower than an average persons. When I asked him what all that meant he suggested that I probably won't die of anything heart related, but my body is otherwise normal.