ATR FIB, short for 'ATR fibrillation', refers to a specific medical condition of the heart. It is characterized by irregular and rapid electrical signals in the atria, leading to abnormal contractions. Synonyms for ATR FIB include atrial fibrillation (AFib), irregular heart rhythm, atrial arrhythmia, and atrial flutter. These terms are often used interchangeably to describe the same condition. ATR FIB typically requires medical intervention to manage symptoms and reduce the risk of complications. It is crucial to consult with a healthcare professional if experiencing any symptoms related to irregular heart rhythm, as early diagnosis and treatment can significantly improve outcomes.