Comparative two methods of adenoidectomy means the coblation adenoidectomy with the cold dissection adenoidectomy specifically inquire which method is safer and more efficient.
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Inclusion Criteria: * children with obstructive symptoms * the children must perform nasopharyngoscopy with clear evidence of obstructive symptoms ( video or polysomnography more than 5 RDI) Exclusion Criteria: * without any recent upper respiratory tract infection or clinical suspicious of adenoiditis. * tonsillectomy * Non randomalization, not blinded