<s>[INST] my sister just had surgery to remove hernia had one removed 3 years ago so much scar tissue so hernia removed through abdomin due to scar tissue. Since surgery she has had an irregulat heart rate getting as high as 160.  She has previously been diagnosed with atrial fibulation.  Could that be causing irradic heat rate [/INST] Mistrial Fibrillation is a condition in which there is irregular heart rate. This occurs as the electrical impulses are not occurring through the normal pathway. It is very unlikely that the hernia and surgery could trigger the fibrillation. Is she on medication for atrial fibrillation? Have they found the cause for the atrial fibrillation? Many times treating the cause of atrial fibrillation will relieve the fibrillation to a great extent. Depending on whether she has persistent or intermittent atrial fibrillation the treatment for her will vary. So I suggest that you ask her to visit her physician and get a complete evaluation. Hope I answered your question. I hope she is also taking blood thinning agents </s>