I am not certain about what is causing your symptoms. My first thought is that patients with heart failure are often more short of breath lying down than sitting or standing. A check by your cardiologist would resolve that issue. I assume that by “heart flutter” you mean atrial flutter, not just a fluttering feeling in your chest. If you had successful ablation of the AV node, then the atria (top portion of your heart) should not be conducting to the ventricles (bottom chambers), whether you have atrial fibrillation or atrial flutter. If there is conduction, then the atrial flutter can be ablated also. If my comments do not answer your questions, find out more about your condition from your doctor and write in again.

Ablation Helps Flutter, Too The Saturday Evening Post

A: Leading cardiologist Dr. Douglas Zipes replies: Premature ventricular contractions are extra heartbeats coming from the bottom chambers of the heart (ventricles). In the vast majority of people, these beats are completely benign and nothing to fear. They are the commonest cause of palpitations affecting all age groups, and generally increase in number as one ages. I spend a lot of time in my practice reassuring patients that the palpitations they are feeling are nothing to worry about. Be happy you don’t sense them, because they can be a nuisance. I feel them occasionally, focus on what I am doing, and forget about them.

Question (and Answer) About Extra Heartbeats The Saturday Evening Post