Uncontrolled studies show promising short and mid term results for POEM. At present, POEM is considered a promising new technique with the potential to become a standard achalasia treatment. For this to happen, however, comparative data with LHM is required. Our study group intends to investigate the short and long-term efficacy of POEM for the treatment of achalasia as it was performed in international centers and compare outcomes with database assessment of LHM.