Table 1.

Grades of difficulty.

Description of insertion	Scope inserting conditions
Duodenoscope – easily inserted without any resistance. Scope manoeuvrability – good without any resistance.	Excellent
Duodenoscope – inserted with slight resistance. Scope manoeuvrability – restricted but possible.	Good
Duodenoscope – requires forceful insertion. Scope manoeuvrability – restricted requires adjustments.	Poor
Duodenoscope – could not be inserted at all forcing change of airway device.	Impossible