<prompt> Most common complication of sliding hernia is -Esophagitis due to continuous refluxPneumoniaHemorrhagePerforation  <response>: Ans. is ai.e., Esophagitis due to continuous reflux o There are 4 types of hiatal herniaType I: Sliding hernia most common type 70 - 80Type II: Paraesophageal or rolling hernia TypeIII: MixedType IV: These hernias are distinguished by the presence of other abdominal viscera wihin the defect i.e. omentum, transverse colon.o Type I or Sliding hiatal hernia This is characterized by upward dislocation of the cardioesophageal junction into the posterior mediastinum.o Type II or Rolling Paraesophageal hernia The cardioesophageal junction is undisplaced The whole or part of stomach herniates into the thorax immediately adjacent and to the left of the undisplaced cardioesophageal junction. Since the normally located gastroesophageal junction functions normally in most of these hernias, reflux is uncommon.Complications of hiatal herniaSliding herniaRolling Paraesophageal herniao Esophagitis de reflux most commono Barretts esophagous adenocarcinomao Aspiration pneumoniao Minor role in development of asthmao Hemorrhage, incarceration obstruction strangulationo Respiratory complicationo Dyspnea from mechanical compressiono Pneumonia if aspiration occurs. 