**Thanks**

I would like to thank Dr. Silvia Helena Cardoso Boghossian for the first cryoballoon procedures with high expertise and patience. My thanks to Sociedade Brasileira de Arritmias Cardíacas (SOBRAC) for encouraging physicians to novel techniques by performing continuous medical education. I also thank my colleagues who helped me in writing this chapter and Dr. David C. Gaze for the opportunity of this chapter.
