Table 1.

Clinical score of anaesthetic depth in cats

Anaesthetic plane	Clinical Score	Pupil position/size	Eye reflex (P=Palpebral, C=Corneal)	Heart rate, blood pressure, breathing	Third eyelid position	Jaw tone, body/limb movement or swallowing
Very light	5	Central, large or small, moving	P: active C: active	Increased, spontaneous spontaneous breathing attempts	Retracted	Strong
Medium-light	4	Central or ventromedial, large or small,	P: active or mildly depressed C: active	Increased, spontaneous breathing attempts	Retracted or partially prolapsed	Medium
Medium	3	Ventromedial, small or medium	P: depressed C: mildly depressed	Normal	Completely Prolapsed	None or barely
Medium-deep	2	Central, medium	P: depressed or markedly depressed C: depressed	Normal or depressed	Completely or partially prolapsed	None
Very deep	1	Central, large	P: absent C: markedly depressed or absent	Depressed	Partially prolapsed	None

Mean arterial blood pressure > 90 mmHg was defined as “increased”, < 60 as “depressed”. Heart rates between 120 and 180 beats per minute were defined as “normal”, lower values as “depressed” and higher values as “increased”