OC.01.5 RAPID DRINK CHALLENGE DURING HIGH RESOLUTION MANOMETRY IS USEFUL TO PREDICT ESOPHAGEAL EMPTYING IN ACHALASIA PATIENTS AFTER TREATMENT. (September 2021) - Arsié, E.; De Bortoli, N.; Savarino, E.; Gyawali, C.P.; Tolone, S.; Consonni, D.; Maniero, D.; Mauro, A.; Visaggi, P.; Greenan, G.; Penagini, R.