Classification of depth of nondepolarizing neuromuscular blockade based on subjective and objective criteria

Depth of block	Posttetanic count (PTC)	Train-of-four count (TOFC)	Subjective train-of-four (TOF) ratio	Measured (actual) train-of-four (TOF) ratio
Intense (profound) block	0	0	0	0
Deep block	≥1	0	0	0
Moderate block	NA	1 to 3	0	0
Light (shallow) block	NA	4	Fade present	0.1 to 0.4
Minimal block	NA	4	No fade	>0.4 but <0.9
Full recovery	NA	4	No fade	≥0.9 to 1.0

NA: data not available.

Reproduced with permission from: Brull SJ. Neuromuscular blocking agents. In: Clinical Anesthesia, 8th ed, Barash PG, Cullen BF, Stoelting RK, et al (Eds), Wolters Kluwer, Philadelphia 2017. Copyright © 2017 Wolters Kluwer.

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Classification of depth of nondepolarizing neuromuscular blockade based on subjective and objective criteria