Unconsciousness

**Definition:** Loss of the ability to maintain awareness of self and environment combined with markedly reduced responsiveness to environmental stimuli. (From Adams et al., Principles of Neurology, 6th ed, pp344-5)

**Tree numbers:** - C10.597.606.358.800 - C23.888.592.604.359.800

**Synonyms:** - Consciousness, Loss of - Unconscious State