I'm 35, white, 6'-4" (193 cm), 155 lbs (70 kg). I've been having premature atrial contractions (PACs) for about ten years. These were originally diagnosed by wearing an event/Holter monitor. They've always been asymptomatic (i.e., no lightheadedness, fatigue, syncope, etc.). Because I'm very thin and have a minor case of pectus excavatum, I tend to feel the palpitations quite distinctly, though especially while inactive and sitting or laying down.