Value of Using One-Way (Heimlich) Valve after Esophagectomy: A Retrospective Cohort Study

1. Abstract This is an observational study of the value of one-way flutter (Heimlich) valve in the patients undergoing hybrid minimally invasive esophagectomy. The study is aiming to establish the efficacy of the Heimlich valve drainage bag system as a safe alternative to a conventional underwater seal drainage bottle