Warm air sensation for assessment of block after spinal anaesthesia

We have evaluated a new method of assessing dermatomal sensory levels after regional anaesthesia based on warm sensation. Sensory levels were assessed in 30 patients after spinal anaesthesia using a respiratory gas humidifier , adapted to deliver a constant flow of warm air at 40+/-0.2 degrees C. Thi s was compared with the cold sensation from ethyl chloride spray. The frequ ency distribution of the dermatomal differences showed 96.6% of the compari sons were between +1 and -1 dermatomes. The median difference in dermatomal levels between the two methods of assessment was 0 (interquartile range 0- 1) (P=0.65). We conclude that the warm air method compares favourably with ethyl chloride spray and both can be used interchangeably.