End–tidal CO2 is increased to maximum level in –
The unanticipated doubling or tripling of end tidal CO2 is the earliest & most sensitive indicator of malignant hyperthermia. The earliest signs seen during anesthesia are masseter muscle rigidity (MMR), tachycardia, & hypercarbia.
Pul. embolism
Malignant hyperthermia
Extubation
Blockage of secretion