The megaesophagus is the name of a syndrome characterized Zado for esophageal motor disorders, in most cases with esophageal dilatation.
This designation does not is perfectly suited for not all carriers this condition, esophageal dilatation, as the nom- ber suggests. In the international literature, this syndrome is usually designated as esophageal achalasia. This de- nomination despite being largely used, only identifies one of the motor disturbances frequently found contracted the disease, represented by the absence of relaxation of lower esophageal sphincter on swallowing. In this text we will use the designation of megaesophagus. This condition may occur as an isolated disease, or be one of the manifestations of Chagas disease. Chagas disease, which is observed only in South American countries, especially Brazil, Argentina, Bolivia and Venezuela, affects about 12,000,000 individuals, as estimated by the Pan Health MERICAN 1970. In Brazil, acquired enough experience with this disease because the high prevalence of it. There are an estimated approximately 8,000,000 of Chagasic in Brazil, where 5% of them presented clinical of megaesophagus. Other factors besides disease Chagas can cause esophageal motor disorders with
the same functional characteristics as, for example:
Congenital megaesophagus, the presbiesófago (megaesophagus senile)
and idiopathic megaesophagus. However, in Brazil 90%
cases are chagasic megaesophagus.