Post-Tetanic Count Deep Block — FRCA Primary MCQ
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Correct answer: A — Deep neuromuscular block when TOF count is zero
PTC is used when TOF count is zero (deep block). A 50 Hz tetanic stimulus for 5 seconds is applied followed by a 3-second pause then single twitch stimuli at 1 Hz. The number of post-tetanic twitches indicates the depth of block. PTC 1-2 indicates deep block suitable for sugammadex 4 mg/kg reversal.
Reference: Peck Hill Williams 2014 Pharmacology for Anaesthesia and Intensive Care