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A Rare Occurrence of Focal Atrial Tachycardia in a Patient with Mixed Connective Tissue Disease and Chronic Rheumatic Heart Disease: A Possible Linkage?

Marsilla Mariaty Marzukie, Razali Omar and Abdul Shukor Abd Bakar

Focal atrial tachycardia (AT) is a relatively uncommon form of arrhythmia. 10% of supraventricular tachycardia are due to AT. It can be diagnosed in a patient without any structural heart disease, however in the elderly, cardiovascular disease is often present. We report a rare occurence of focal atrial tachycardia, proven on three dimensional (3D) electrophysiology mapping of the heart in a 44-years-old woman with underlying mixed connective tissue disease and chronic rheumatic heart disease who was successfully treated with radiofrequency ablation. Primary question remained unanswered whether the arrythmia could be linked to her underlying disease, or purely a coincidental finding.