Dear All, The title of my post might surpise some of you (bradycardia) since this is a Postural Tachycardia Syndrome Forum...I shall try to explain. I was diagnosed with POTS by Prof. Mathias in 2002 (England). I get all the nasty symtoms (lightheadidness, orthostatic tachycardia etc). However, (this is the interesting bit), very often my resting heart rate (when I sit or lying down) is 50 or lower (!) at times and I know for a fact that it can go to as low as 38 during sleep (holter). I am writing this email now and my heart rate is 50!!! Who would believe that I have PoTS? Of course when I stand up, or after drinking stimulants like caffeine etc, my heart rate is restored to the usual 130s... I was wondering if any of you had this problem, and whether you could offer any explanations. The thing is that I feel dizzy when I stand up (probably because of the acceleration and the drop in BP), but also (!!!) I feel dizzy when I sit (maybe due to the bradycardia???) Yours views are welcome. All the Best Alex