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Table 1 Modified nasal intubation-difficulty scale (NIDS)

From: Comparison of C-MAC D-blade videolaryngoscope and McCoy laryngoscope efficacy for nasotracheal intubation in simulated cervical spinal injury: a prospective randomized comparative study

N1: Intubation attemptsEach additional intubation attempt after the first one adds 1 point
N2: Operators to attempt intubationEach additional operator required to attempt intubation adds 1 point
N3: Alternative intubation techniques or change head positionEach alternative intubation technique or change head position adds 1 point
N4: Glottic exposure0 = good visualization of vocal cords with little manipulation
1 = tools manipulated in all directions to identify the vocal cords
2 = tools extensively manipulated in all directions to identify the vocal cords
N5: Lifting force required to expose the vocal cords0 = lifting without assistance
1 = lifting required by assistant to improve view of the vocal cords
N6: Optimize glottis exposure with BURP (backward, upward and right ward pressure)0 = none
1 = BURP applied
N7: Techniques to aid intubation0 = none
1 = cuff inflation or Magill forceps