Methods Two hundred patients with palpitations and no clear cause for their symptoms will be randomized to receive either PPI or placebo for one month. At base line they will be investigated to rule out arrhythmia by documenting normal heart rate (less than 110 beat per minute) or ECG showing normal sinus rhythm or mild sinus tachycardia (Less than 110 per minute) during symptoms. Obvious causes such as anxiety due to a stressful event or organic causes such anemia or thyroid disorders should be also ruled out.