Third space endoscopy pulmonary complications and chylothorax post peroral endoscopic myotomy

Table 1 The adverse events in gastrointestinal endoscopy classification

Grading	Definition
No adverse event	A telephone contact with the general practitioner, outpatient clinic, or endoscopy service without any intervention or extended observation of the patient after the procedure, < 3 hours, without any intervention
Grade I	Adverse events with any deviation of the standard postprocedural course, without the need for pharmacologic treatment or endoscopic, radiologic, or surgical interventions
	Presentation at the emergency ward, without any intervention
	Hospital admission (< 24 hours), without any intervention
	Allowed therapeutic regimens are drugs as antiemetics, antipyretics, analgesics, and electrolytes
	Allowed diagnostic tests: Radiology and laboratory tests
Grade II	Adverse events requiring pharmacologic treatment with drugs other than those allowed for grade I adverse events (i.e., antibiotics, antithrombotics, etc.)
	Blood or blood product transfusions
	Hospital admission for more than 24 hours
Grade III	Adverse events requiring endoscopic, radiologic, or surgical intervention
Grade IIIa	Endoscopic or radiologic intervention
Grade IIIb	Surgical intervention
Grade IV	Adverse events requiring intensive care unit/critical care unit admission
Grade IVa	Single-organ dysfunction (including dialysis)
Grade IVb	Multiorgan dysfunction
Grade V	Death

Definition of adverse event: All negative outcomes for a patient that prevent completion of the planned procedure or cause any deviation from the standard postprocedural course.